{"parentUuid":null,"isSidechain":false,"type":"progress","data":{"type":"hook_progress","hookEvent":"SessionStart","hookName":"SessionStart:startup","command":"entire hooks claude-code session-start"},"parentToolUseID":"c690856e-6aa7-4c4b-80cf-05519753c287","toolUseID":"c690856e-6aa7-4c4b-80cf-05519753c287","timestamp":"2026-03-25T04:59:29.233Z","uuid":"f3e72020-2fec-4c3b-8abe-2009cd9c96a1","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix"} {"type":"file-history-snapshot","messageId":"589439f6-bf17-406d-9a93-ee42325b162a","snapshot":{"messageId":"589439f6-bf17-406d-9a93-ee42325b162a","trackedFileBackups":{},"timestamp":"2026-03-25T05:03:18.182Z"},"isSnapshotUpdate":false} {"parentUuid":"f3e72020-2fec-4c3b-8abe-2009cd9c96a1","isSidechain":false,"promptId":"32125b75-4928-41fc-805e-168a61de928f","type":"user","message":{"role":"user","content":"The changes yesterday caused a severe Regression on the startup time. The checkpoint loading takes much longer. Before: [INFO] metricstore.go:159: [METRICSTORE]> Checkpoints loaded (5811 files, 22242 MB, that took 13.982486s)\n3/24/2026, 7:19:34 AMINFO[INFO] metricstore.go:153: [METRICSTORE]> Loading checkpoints newer than 2026-03-23T07:19:34+01:00. And after the changes: etricstore.go:159: [METRICSTORE]> Checkpoints loaded (5860 files, 21338 MB, that took 302.524814s)\n3/24/2026, 6:10:53 PMINFO[INFO] metricstore.go:153: [METRICSTORE]> Loading checkpoints newer than 2026-03-23T18:10:53+01:00\n3/24/2026, 6:10:43 PMINFO[INFO] metricstore.go:153: [METRICSTORE]> Loading checkpoints newer than 2026-03-23T18:10:43+01:00\n3/24/2026, 6:09:50 PMINFO[INFO] metricstore.go:153: [METRICSTORE]> Loading checkpoints newer than 2026-03-23T18:09:50+01:00\n3/24/2026, 6:05:57 PMINFO[INFO] metricstore.go:153: [METRICSTORE]> Loading checkpoints newer than 2026-03-23T18:05:57+01:00\n3/24/2026, 6:02:12 PMINFO[INFO] metricstore.go:153: [METRICSTORE]> Loading checkpoints newer than 2026-03-23T18:02:12+01:00. Investigate the issue and fix it."},"uuid":"589439f6-bf17-406d-9a93-ee42325b162a","timestamp":"2026-03-25T05:03:17.412Z","permissionMode":"plan","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"589439f6-bf17-406d-9a93-ee42325b162a","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01SnEnNne1QzvKwLAj3YP5pC","type":"message","role":"assistant","content":[{"type":"thinking","thinking":"","signature":"EuECClcIDBgCKkDy3JQWNzaBNsSHOvwQxZqggq9UxmMs06pErtnRygylo2gfaxelIOicmcQCRyFurPtrry+Amr7zCwSlJ/tRKXE2Mg9jbGF1ZGUtb3B1cy00LTYSDINkpMOtW3mvBmwQ1hoMh3QucjIAY9M6/LycIjBX/0zUHK4TFrEG5Lho0d5PD8vULcOLE4DUqJI44g/JzrxBYYsFAlkGdR5H2HqFbLwqtwG1mtYRMhW3wwRGJ7TPWlJDvgUoUFBv1gvK72EpoCRi6HHWZOeUhUe/Sz9Xi4/EBoc5lyL//ZCXjHDXd1VqZ1MB1ODmdBWh9W7FtFENDzFJ8D7kgCJfpyBUdJbYs/VMgbe0EswR2G4zOESb11q2jyrhdXjqRZ9BfpS0piorH4JhnBe4k5lS9j2LEpAwzfjfohp0rGMRTq6SGIXO2zbY9F+VgeRxVfeuX8cYccXyRVzsG2JoXQMpm0MYAQ=="}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":3,"cache_creation_input_tokens":14790,"cache_read_input_tokens":6405,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":14790},"output_tokens":9,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZPDKdP3ub6dbPN2hMgaZ","type":"assistant","uuid":"e5445568-49cd-4078-b0e1-a1bd8e725086","timestamp":"2026-03-25T05:03:21.662Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"e5445568-49cd-4078-b0e1-a1bd8e725086","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01SnEnNne1QzvKwLAj3YP5pC","type":"message","role":"assistant","content":[{"type":"text","text":"Let me investigate the recent changes to the checkpoint loading code."}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":3,"cache_creation_input_tokens":14790,"cache_read_input_tokens":6405,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":14790},"output_tokens":9,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZPDKdP3ub6dbPN2hMgaZ","type":"assistant","uuid":"3cd2a5f7-bc2a-41ab-a957-18d010ca8466","timestamp":"2026-03-25T05:03:22.157Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} 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metricstore"},"caller":{"type":"direct"}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":3,"cache_creation_input_tokens":14790,"cache_read_input_tokens":6405,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":14790},"output_tokens":9,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZPDKdP3ub6dbPN2hMgaZ","type":"assistant","uuid":"b4b5064d-0201-4223-9429-6f3816e3be07","timestamp":"2026-03-25T05:03:23.137Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"b4b5064d-0201-4223-9429-6f3816e3be07","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01SnEnNne1QzvKwLAj3YP5pC","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01V6KKGNxNDWebMjy6fkJA4R","name":"Bash","input":{"command":"git diff HEAD~5..HEAD -- pkg/metricstore/ --stat","description":"Files changed in recent commits"},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"usage":{"input_tokens":3,"cache_creation_input_tokens":14790,"cache_read_input_tokens":6405,"output_tokens":263,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":14790,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CZPDKdP3ub6dbPN2hMgaZ","type":"assistant","uuid":"2b812a4c-326a-4735-9cfd-00e7f348684a","timestamp":"2026-03-25T05:03:23.707Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"b4b5064d-0201-4223-9429-6f3816e3be07","isSidechain":false,"promptId":"32125b75-4928-41fc-805e-168a61de928f","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_015eG3e7B99PnezbvEJk2jo9","type":"tool_result","content":"6f7dda53 Cleanup\n0325d9e8 fix: Increase throughput for WAL writers\ne41d1251 fix: Continue on error\n586c9020 Restructure metricstore cleanup archiving to stay withinh 32k parquet-go limit\n96a79098 carry forward: uncommitted session files\nc0d2d65f Introduce average resampler support\n09501df3 fix: reduce memory usage in parquet checkpoint archiver\nd3b94c33 Completed 'Explore' agent: Find CUDA/HIP macro switching (toolu_01EbN3)\n8b132ed7 fix: Blocking ReceiveNats call\nbf1a8a17 fix: Shard WAL consumer for higher throughput\n50aed595 fix: metricstore NATS contention\n818a05f2 carry forward: uncommitted session files\nd46e6371 Add log about checkpoint archiving\n02f82c2c fix: Prevent memory spikes in parquet writer for metricstore move policy\n0a4c4d8e Patching parquet archive writer for high memory usage\nbab6eb4c Convert Warn message on missing metrics to Debug level\n39ab1278 Make checkpointInterval an option config option again.\nb214e175 Add buffered I/O to WAL writes and fix MemoryCap comment\n8234ad31 fix: Fix metricstore memory explosion from broken emergency free and batch aborts\necd29b28 carry forward: uncommitted session files","is_error":false}]},"uuid":"52cebc01-36fd-45ce-bedd-81ab1c2d4f0f","timestamp":"2026-03-25T05:03:23.714Z","toolUseResult":{"stdout":"6f7dda53 Cleanup\n0325d9e8 fix: Increase throughput for WAL writers\ne41d1251 fix: Continue on error\n586c9020 Restructure metricstore cleanup archiving to stay withinh 32k parquet-go limit\n96a79098 carry forward: uncommitted session files\nc0d2d65f Introduce average resampler support\n09501df3 fix: reduce memory usage in parquet checkpoint archiver\nd3b94c33 Completed 'Explore' agent: Find CUDA/HIP macro switching (toolu_01EbN3)\n8b132ed7 fix: Blocking ReceiveNats call\nbf1a8a17 fix: Shard WAL consumer for higher throughput\n50aed595 fix: metricstore NATS contention\n818a05f2 carry forward: uncommitted session files\nd46e6371 Add log about checkpoint archiving\n02f82c2c fix: Prevent memory spikes in parquet writer for metricstore move policy\n0a4c4d8e Patching parquet archive writer for high memory usage\nbab6eb4c Convert Warn message on missing metrics to Debug level\n39ab1278 Make checkpointInterval an option config option again.\nb214e175 Add buffered I/O to WAL writes and fix MemoryCap comment\n8234ad31 fix: Fix metricstore memory explosion from broken emergency free and batch aborts\necd29b28 carry forward: uncommitted session files","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false},"sourceToolAssistantUUID":"b4b5064d-0201-4223-9429-6f3816e3be07","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"2b812a4c-326a-4735-9cfd-00e7f348684a","isSidechain":false,"promptId":"32125b75-4928-41fc-805e-168a61de928f","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01V6KKGNxNDWebMjy6fkJA4R","type":"tool_result","content":"diff --git a/pkg/metricstore/walCheckpoint.go b/pkg/metricstore/walCheckpoint.go\nindex 38585cf5..57064e5f 100644\n--- a/pkg/metricstore/walCheckpoint.go\n+++ b/pkg/metricstore/walCheckpoint.go\n@@ -69,6 +69,7 @@ import (\n \t\"strings\"\n \t\"sync\"\n \t\"sync/atomic\"\n+\t\"time\"\n \n \tcclog \"github.com/ClusterCockpit/cc-lib/v2/ccLogger\"\n \t\"github.com/ClusterCockpit/cc-lib/v2/schema\"\n@@ -111,10 +112,16 @@ type walRotateReq struct {\n \n // walFileState holds an open WAL file handle and buffered writer for one host directory.\n type walFileState struct {\n-\tf *os.File\n-\tw *bufio.Writer\n+\tf *os.File\n+\tw *bufio.Writer\n+\tdirty bool\n }\n \n+// walFlushInterval controls how often dirty WAL files are flushed to disk.\n+// Decoupling flushes from message processing lets the consumer run at memory\n+// speed, amortizing syscall overhead across many writes.\n+const walFlushInterval = 5 * time.Second\n+\n // walShardIndex computes which shard a message belongs to based on cluster+node.\n // Uses FNV-1a hash for fast, well-distributed mapping.\n func walShardIndex(cluster, node string) int {\n@@ -222,6 +229,7 @@ func WALStaging(wg *sync.WaitGroup, ctx context.Context) {\n \t\t\t\tif err := writeWALRecordDirect(ws.w, msg); err != nil {\n \t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> WAL: write record: %v\", err)\n \t\t\t\t}\n+\t\t\t\tws.dirty = true\n \t\t\t}\n \n \t\t\tprocessRotate := func(req walRotateReq) {\n@@ -238,10 +246,11 @@ func WALStaging(wg *sync.WaitGroup, ctx context.Context) {\n \t\t\t\tclose(req.done)\n \t\t\t}\n \n-\t\t\tflushAll := func() {\n+\t\t\tflushDirty := func() {\n \t\t\t\tfor _, ws := range hostFiles {\n-\t\t\t\t\tif ws.f != nil {\n+\t\t\t\t\tif ws.dirty {\n \t\t\t\t\t\tws.w.Flush()\n+\t\t\t\t\t\tws.dirty = false\n \t\t\t\t\t}\n \t\t\t\t}\n \t\t\t}\n@@ -257,12 +266,35 @@ func WALStaging(wg *sync.WaitGroup, ctx context.Context) {\n \t\t\t\t\tcase req := <-rotateCh:\n \t\t\t\t\t\tprocessRotate(req)\n \t\t\t\t\tdefault:\n-\t\t\t\t\t\tflushAll()\n+\t\t\t\t\t\tflushDirty()\n \t\t\t\t\t\treturn\n \t\t\t\t\t}\n \t\t\t\t}\n \t\t\t}\n \n+\t\t\tticker := time.NewTicker(walFlushInterval)\n+\t\t\tdefer ticker.Stop()\n+\n+\t\t\t// drainBatch processes up to 4096 pending messages without blocking.\n+\t\t\t// Returns false if the channel was closed.\n+\t\t\tdrainBatch := func() bool {\n+\t\t\t\tfor range 4096 {\n+\t\t\t\t\tselect {\n+\t\t\t\t\tcase msg, ok := <-msgCh:\n+\t\t\t\t\t\tif !ok {\n+\t\t\t\t\t\t\tflushDirty()\n+\t\t\t\t\t\t\treturn false\n+\t\t\t\t\t\t}\n+\t\t\t\t\t\tprocessMsg(msg)\n+\t\t\t\t\tcase req := <-rotateCh:\n+\t\t\t\t\t\tprocessRotate(req)\n+\t\t\t\t\tdefault:\n+\t\t\t\t\t\treturn true\n+\t\t\t\t\t}\n+\t\t\t\t}\n+\t\t\t\treturn true\n+\t\t\t}\n+\n \t\t\tfor {\n \t\t\t\tselect {\n \t\t\t\tcase <-ctx.Done():\n@@ -273,23 +305,12 @@ func WALStaging(wg *sync.WaitGroup, ctx context.Context) {\n \t\t\t\t\t\treturn\n \t\t\t\t\t}\n \t\t\t\t\tprocessMsg(msg)\n-\n-\t\t\t\t\t// Drain up to 256 more messages without blocking to batch writes.\n-\t\t\t\t\tfor range 256 {\n-\t\t\t\t\t\tselect {\n-\t\t\t\t\t\tcase msg, ok := <-msgCh:\n-\t\t\t\t\t\t\tif !ok {\n-\t\t\t\t\t\t\t\treturn\n-\t\t\t\t\t\t\t}\n-\t\t\t\t\t\t\tprocessMsg(msg)\n-\t\t\t\t\t\tcase req := <-rotateCh:\n-\t\t\t\t\t\t\tprocessRotate(req)\n-\t\t\t\t\t\tdefault:\n-\t\t\t\t\t\t\tgoto flushed\n-\t\t\t\t\t\t}\n+\t\t\t\t\tif !drainBatch() {\n+\t\t\t\t\t\treturn\n \t\t\t\t\t}\n-\t\t\t\tflushed:\n-\t\t\t\t\tflushAll()\n+\t\t\t\t\t// No flush here — timer handles periodic flushing.\n+\t\t\t\tcase <-ticker.C:\n+\t\t\t\t\tflushDirty()\n \t\t\t\tcase req := <-rotateCh:\n \t\t\t\t\tprocessRotate(req)\n \t\t\t\t}\n@@ -413,69 +434,6 @@ func writeWALRecordDirect(w *bufio.Writer, msg *WALMessage) error {\n \treturn err\n }\n \n-// buildWALPayload encodes a WALMessage into a binary payload (without magic/length/CRC).\n-func buildWALPayload(msg *WALMessage) []byte {\n-\tsize := 8 + 2 + len(msg.MetricName) + 1 + 4\n-\tfor _, s := range msg.Selector {\n-\t\tsize += 1 + len(s)\n-\t}\n-\n-\tbuf := make([]byte, 0, size)\n-\n-\t// Timestamp (8 bytes, little-endian int64)\n-\tvar ts [8]byte\n-\tbinary.LittleEndian.PutUint64(ts[:], uint64(msg.Timestamp))\n-\tbuf = append(buf, ts[:]...)\n-\n-\t// Metric name (2-byte length prefix + bytes)\n-\tvar mLen [2]byte\n-\tbinary.LittleEndian.PutUint16(mLen[:], uint16(len(msg.MetricName)))\n-\tbuf = append(buf, mLen[:]...)\n-\tbuf = append(buf, msg.MetricName...)\n-\n-\t// Selector count (1 byte)\n-\tbuf = append(buf, byte(len(msg.Selector)))\n-\n-\t// Selectors (1-byte length prefix + bytes each)\n-\tfor _, sel := range msg.Selector {\n-\t\tbuf = append(buf, byte(len(sel)))\n-\t\tbuf = append(buf, sel...)\n-\t}\n-\n-\t// Value (4 bytes, float32 bit representation)\n-\tvar val [4]byte\n-\tbinary.LittleEndian.PutUint32(val[:], math.Float32bits(float32(msg.Value)))\n-\tbuf = append(buf, val[:]...)\n-\n-\treturn buf\n-}\n-\n-// writeWALRecord appends a binary WAL record to the writer.\n-// Format: [4B magic][4B payload_len][payload][4B CRC32]\n-func writeWALRecord(w io.Writer, msg *WALMessage) error {\n-\tpayload := buildWALPayload(msg)\n-\tcrc := crc32.ChecksumIEEE(payload)\n-\n-\trecord := make([]byte, 0, 4+4+len(payload)+4)\n-\n-\tvar magic [4]byte\n-\tbinary.LittleEndian.PutUint32(magic[:], walRecordMagic)\n-\trecord = append(record, magic[:]...)\n-\n-\tvar pLen [4]byte\n-\tbinary.LittleEndian.PutUint32(pLen[:], uint32(len(payload)))\n-\trecord = append(record, pLen[:]...)\n-\n-\trecord = append(record, payload...)\n-\n-\tvar crcBytes [4]byte\n-\tbinary.LittleEndian.PutUint32(crcBytes[:], crc)\n-\trecord = append(record, crcBytes[:]...)\n-\n-\t_, err := w.Write(record)\n-\treturn err\n-}\n-\n // readWALRecord reads one WAL record from the reader.\n // Returns (nil, nil) on clean EOF. Returns error on data corruption.\n // A CRC mismatch indicates a truncated trailing record (expected on crash).","is_error":false}]},"uuid":"a362f625-76f3-4a85-9ad8-ef95abd507b1","timestamp":"2026-03-25T05:03:23.738Z","toolUseResult":{"stdout":"diff --git a/pkg/metricstore/walCheckpoint.go b/pkg/metricstore/walCheckpoint.go\nindex 38585cf5..57064e5f 100644\n--- a/pkg/metricstore/walCheckpoint.go\n+++ b/pkg/metricstore/walCheckpoint.go\n@@ -69,6 +69,7 @@ import (\n \t\"strings\"\n \t\"sync\"\n \t\"sync/atomic\"\n+\t\"time\"\n \n \tcclog \"github.com/ClusterCockpit/cc-lib/v2/ccLogger\"\n \t\"github.com/ClusterCockpit/cc-lib/v2/schema\"\n@@ -111,10 +112,16 @@ type walRotateReq struct {\n \n // walFileState holds an open WAL file handle and buffered writer for one host directory.\n type walFileState struct {\n-\tf *os.File\n-\tw *bufio.Writer\n+\tf *os.File\n+\tw *bufio.Writer\n+\tdirty bool\n }\n \n+// walFlushInterval controls how often dirty WAL files are flushed to disk.\n+// Decoupling flushes from message processing lets the consumer run at memory\n+// speed, amortizing syscall overhead across many writes.\n+const walFlushInterval = 5 * time.Second\n+\n // walShardIndex computes which shard a message belongs to based on cluster+node.\n // Uses FNV-1a hash for fast, well-distributed mapping.\n func walShardIndex(cluster, node string) int {\n@@ -222,6 +229,7 @@ func WALStaging(wg *sync.WaitGroup, ctx context.Context) {\n \t\t\t\tif err := writeWALRecordDirect(ws.w, msg); err != nil {\n \t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> WAL: write record: %v\", err)\n \t\t\t\t}\n+\t\t\t\tws.dirty = true\n \t\t\t}\n \n \t\t\tprocessRotate := func(req walRotateReq) {\n@@ -238,10 +246,11 @@ func WALStaging(wg *sync.WaitGroup, ctx context.Context) {\n \t\t\t\tclose(req.done)\n \t\t\t}\n \n-\t\t\tflushAll := func() {\n+\t\t\tflushDirty := func() {\n \t\t\t\tfor _, ws := range hostFiles {\n-\t\t\t\t\tif ws.f != nil {\n+\t\t\t\t\tif ws.dirty {\n \t\t\t\t\t\tws.w.Flush()\n+\t\t\t\t\t\tws.dirty = false\n \t\t\t\t\t}\n \t\t\t\t}\n \t\t\t}\n@@ -257,12 +266,35 @@ func WALStaging(wg *sync.WaitGroup, ctx context.Context) {\n \t\t\t\t\tcase req := <-rotateCh:\n \t\t\t\t\t\tprocessRotate(req)\n \t\t\t\t\tdefault:\n-\t\t\t\t\t\tflushAll()\n+\t\t\t\t\t\tflushDirty()\n \t\t\t\t\t\treturn\n \t\t\t\t\t}\n \t\t\t\t}\n \t\t\t}\n \n+\t\t\tticker := time.NewTicker(walFlushInterval)\n+\t\t\tdefer ticker.Stop()\n+\n+\t\t\t// drainBatch processes up to 4096 pending messages without blocking.\n+\t\t\t// Returns false if the channel was closed.\n+\t\t\tdrainBatch := func() bool {\n+\t\t\t\tfor range 4096 {\n+\t\t\t\t\tselect {\n+\t\t\t\t\tcase msg, ok := <-msgCh:\n+\t\t\t\t\t\tif !ok {\n+\t\t\t\t\t\t\tflushDirty()\n+\t\t\t\t\t\t\treturn false\n+\t\t\t\t\t\t}\n+\t\t\t\t\t\tprocessMsg(msg)\n+\t\t\t\t\tcase req := <-rotateCh:\n+\t\t\t\t\t\tprocessRotate(req)\n+\t\t\t\t\tdefault:\n+\t\t\t\t\t\treturn true\n+\t\t\t\t\t}\n+\t\t\t\t}\n+\t\t\t\treturn true\n+\t\t\t}\n+\n \t\t\tfor {\n \t\t\t\tselect {\n \t\t\t\tcase <-ctx.Done():\n@@ -273,23 +305,12 @@ func WALStaging(wg *sync.WaitGroup, ctx context.Context) {\n \t\t\t\t\t\treturn\n \t\t\t\t\t}\n \t\t\t\t\tprocessMsg(msg)\n-\n-\t\t\t\t\t// Drain up to 256 more messages without blocking to batch writes.\n-\t\t\t\t\tfor range 256 {\n-\t\t\t\t\t\tselect {\n-\t\t\t\t\t\tcase msg, ok := <-msgCh:\n-\t\t\t\t\t\t\tif !ok {\n-\t\t\t\t\t\t\t\treturn\n-\t\t\t\t\t\t\t}\n-\t\t\t\t\t\t\tprocessMsg(msg)\n-\t\t\t\t\t\tcase req := <-rotateCh:\n-\t\t\t\t\t\t\tprocessRotate(req)\n-\t\t\t\t\t\tdefault:\n-\t\t\t\t\t\t\tgoto flushed\n-\t\t\t\t\t\t}\n+\t\t\t\t\tif !drainBatch() {\n+\t\t\t\t\t\treturn\n \t\t\t\t\t}\n-\t\t\t\tflushed:\n-\t\t\t\t\tflushAll()\n+\t\t\t\t\t// No flush here — timer handles periodic flushing.\n+\t\t\t\tcase <-ticker.C:\n+\t\t\t\t\tflushDirty()\n \t\t\t\tcase req := <-rotateCh:\n \t\t\t\t\tprocessRotate(req)\n \t\t\t\t}\n@@ -413,69 +434,6 @@ func writeWALRecordDirect(w *bufio.Writer, msg *WALMessage) error {\n \treturn err\n }\n \n-// buildWALPayload encodes a WALMessage into a binary payload (without magic/length/CRC).\n-func buildWALPayload(msg *WALMessage) []byte {\n-\tsize := 8 + 2 + len(msg.MetricName) + 1 + 4\n-\tfor _, s := range msg.Selector {\n-\t\tsize += 1 + len(s)\n-\t}\n-\n-\tbuf := make([]byte, 0, size)\n-\n-\t// Timestamp (8 bytes, little-endian int64)\n-\tvar ts [8]byte\n-\tbinary.LittleEndian.PutUint64(ts[:], uint64(msg.Timestamp))\n-\tbuf = append(buf, ts[:]...)\n-\n-\t// Metric name (2-byte length prefix + bytes)\n-\tvar mLen [2]byte\n-\tbinary.LittleEndian.PutUint16(mLen[:], uint16(len(msg.MetricName)))\n-\tbuf = append(buf, mLen[:]...)\n-\tbuf = append(buf, msg.MetricName...)\n-\n-\t// Selector count (1 byte)\n-\tbuf = append(buf, byte(len(msg.Selector)))\n-\n-\t// Selectors (1-byte length prefix + bytes each)\n-\tfor _, sel := range msg.Selector {\n-\t\tbuf = append(buf, byte(len(sel)))\n-\t\tbuf = append(buf, sel...)\n-\t}\n-\n-\t// Value (4 bytes, float32 bit representation)\n-\tvar val [4]byte\n-\tbinary.LittleEndian.PutUint32(val[:], math.Float32bits(float32(msg.Value)))\n-\tbuf = append(buf, val[:]...)\n-\n-\treturn buf\n-}\n-\n-// writeWALRecord appends a binary WAL record to the writer.\n-// Format: [4B magic][4B payload_len][payload][4B CRC32]\n-func writeWALRecord(w io.Writer, msg *WALMessage) error {\n-\tpayload := buildWALPayload(msg)\n-\tcrc := crc32.ChecksumIEEE(payload)\n-\n-\trecord := make([]byte, 0, 4+4+len(payload)+4)\n-\n-\tvar magic [4]byte\n-\tbinary.LittleEndian.PutUint32(magic[:], walRecordMagic)\n-\trecord = append(record, magic[:]...)\n-\n-\tvar pLen [4]byte\n-\tbinary.LittleEndian.PutUint32(pLen[:], uint32(len(payload)))\n-\trecord = append(record, pLen[:]...)\n-\n-\trecord = append(record, payload...)\n-\n-\tvar crcBytes [4]byte\n-\tbinary.LittleEndian.PutUint32(crcBytes[:], crc)\n-\trecord = append(record, crcBytes[:]...)\n-\n-\t_, err := w.Write(record)\n-\treturn err\n-}\n-\n // readWALRecord reads one WAL record from the reader.\n // Returns (nil, nil) on clean EOF. Returns error on data corruption.\n // A CRC mismatch indicates a truncated trailing record (expected on crash).","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false},"sourceToolAssistantUUID":"2b812a4c-326a-4735-9cfd-00e7f348684a","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"a362f625-76f3-4a85-9ad8-ef95abd507b1","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01HjuZsFDEbgpJi2p5iBx3CC","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01KQUJa7YTRXpC6cYRpvNZUC","name":"Bash","input":{"command":"git log --oneline -5 -- pkg/metricstore/walCheckpoint.go","description":"Recent commits to walCheckpoint.go"},"caller":{"type":"direct"}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":2748,"cache_read_input_tokens":21195,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":2748},"output_tokens":53,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZPDL2zceFzQDVadsUjvL","type":"assistant","uuid":"ee618f63-c649-4c36-a4ec-4e7a36303028","timestamp":"2026-03-25T05:03:29.654Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"ee618f63-c649-4c36-a4ec-4e7a36303028","isSidechain":false,"promptId":"32125b75-4928-41fc-805e-168a61de928f","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01KQUJa7YTRXpC6cYRpvNZUC","type":"tool_result","content":"6f7dda53 Cleanup\n0325d9e8 fix: Increase throughput for WAL writers\nbf1a8a17 fix: Shard WAL consumer for higher throughput\n50aed595 fix: metricstore NATS contention\nb214e175 Add buffered I/O to WAL writes and fix MemoryCap comment","is_error":false}]},"uuid":"692459aa-6f48-4a74-9721-fefe96bbd4a5","timestamp":"2026-03-25T05:03:29.705Z","toolUseResult":{"stdout":"6f7dda53 Cleanup\n0325d9e8 fix: Increase throughput for WAL writers\nbf1a8a17 fix: Shard WAL consumer for higher throughput\n50aed595 fix: metricstore NATS contention\nb214e175 Add buffered I/O to WAL writes and fix MemoryCap comment","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false},"sourceToolAssistantUUID":"ee618f63-c649-4c36-a4ec-4e7a36303028","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"692459aa-6f48-4a74-9721-fefe96bbd4a5","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01HjuZsFDEbgpJi2p5iBx3CC","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_014jW65Poo3XtSCeV5fYH2XY","name":"Bash","input":{"command":"git diff HEAD~3..HEAD -- pkg/metricstore/checkpoint.go","description":"Changes to checkpoint.go loading logic"},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":2748,"cache_read_input_tokens":21195,"output_tokens":169,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":2748,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CZPDL2zceFzQDVadsUjvL","type":"assistant","uuid":"9a117dbf-87a0-42c5-aac4-b6cab1613832","timestamp":"2026-03-25T05:03:30.408Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"9a117dbf-87a0-42c5-aac4-b6cab1613832","isSidechain":false,"promptId":"32125b75-4928-41fc-805e-168a61de928f","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_014jW65Poo3XtSCeV5fYH2XY","type":"tool_result","content":"(Bash completed with no output)","is_error":false}]},"uuid":"0ca179a4-21c2-486d-835c-14f7c05b6257","timestamp":"2026-03-25T05:03:30.443Z","toolUseResult":{"stdout":"","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false},"sourceToolAssistantUUID":"9a117dbf-87a0-42c5-aac4-b6cab1613832","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"0ca179a4-21c2-486d-835c-14f7c05b6257","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_018d2u4yBNBdF8fMpDWt1VF6","type":"message","role":"assistant","content":[{"type":"text","text":"The WAL writing changes look fine — they only affect write path, not loading. Let me check the loading code more carefully."}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":417,"cache_read_input_tokens":23943,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":417},"output_tokens":1,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZPDLXTdeQHvDQxtfXNds","type":"assistant","uuid":"dcd56da5-e6be-4c02-81ab-57266ba6d7e9","timestamp":"2026-03-25T05:03:33.569Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"dcd56da5-e6be-4c02-81ab-57266ba6d7e9","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_018d2u4yBNBdF8fMpDWt1VF6","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01M9tePyGMfeaMMz9qXLEkeJ","name":"Bash","input":{"command":"git log --all --oneline -10 -- pkg/metricstore/checkpoint.go","description":"Recent commits to checkpoint.go"},"caller":{"type":"direct"}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":417,"cache_read_input_tokens":23943,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":417},"output_tokens":1,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZPDLXTdeQHvDQxtfXNds","type":"assistant","uuid":"aef94d74-507e-4ff2-b6d1-d6dd60bb85ae","timestamp":"2026-03-25T05:03:34.497Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"aef94d74-507e-4ff2-b6d1-d6dd60bb85ae","isSidechain":false,"promptId":"32125b75-4928-41fc-805e-168a61de928f","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01M9tePyGMfeaMMz9qXLEkeJ","type":"tool_result","content":"96a79098 carry forward: uncommitted session files\nd3b94c33 Completed 'Explore' agent: Find CUDA/HIP macro switching (toolu_01EbN3)\n818a05f2 carry forward: uncommitted session files\n39ab1278 Make checkpointInterval an option config option again.\necd29b28 carry forward: uncommitted session files\n21b6c1b5 carry forward: uncommitted session files\n39635ea1 Cleanup metricstore options\na418abc7 Run go fix\nca0f9a42 Introduce metric store binary checkpoints with write ahead log\n9fc1836c Replace avro checkpoints with native binary format","is_error":false}]},"uuid":"c7ad6c88-6da7-43fc-a84f-07a41e2eb6f8","timestamp":"2026-03-25T05:03:34.586Z","toolUseResult":{"stdout":"96a79098 carry forward: uncommitted session files\nd3b94c33 Completed 'Explore' agent: Find CUDA/HIP macro switching (toolu_01EbN3)\n818a05f2 carry forward: uncommitted session files\n39ab1278 Make checkpointInterval an option config option again.\necd29b28 carry forward: uncommitted session files\n21b6c1b5 carry forward: uncommitted session files\n39635ea1 Cleanup metricstore options\na418abc7 Run go fix\nca0f9a42 Introduce metric store binary checkpoints with write ahead log\n9fc1836c Replace avro checkpoints with native binary format","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false},"sourceToolAssistantUUID":"aef94d74-507e-4ff2-b6d1-d6dd60bb85ae","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"c7ad6c88-6da7-43fc-a84f-07a41e2eb6f8","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_018d2u4yBNBdF8fMpDWt1VF6","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01Sdr2k4nu9uKcgPuMv4bfqJ","name":"Bash","input":{"command":"git diff HEAD~10..HEAD -- pkg/metricstore/checkpoint.go pkg/metricstore/metricstore.go","description":"Recent changes to checkpoint loading"},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":417,"cache_read_input_tokens":23943,"output_tokens":203,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":417,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CZPDLXTdeQHvDQxtfXNds","type":"assistant","uuid":"a5a82712-6356-4327-83b3-d9894292325d","timestamp":"2026-03-25T05:03:34.850Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"a5a82712-6356-4327-83b3-d9894292325d","isSidechain":false,"promptId":"32125b75-4928-41fc-805e-168a61de928f","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01Sdr2k4nu9uKcgPuMv4bfqJ","type":"tool_result","content":"(Bash completed with no output)","is_error":false}]},"uuid":"710f8ed4-c86b-49f7-a028-61263128a8d0","timestamp":"2026-03-25T05:03:34.895Z","toolUseResult":{"stdout":"","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false},"sourceToolAssistantUUID":"a5a82712-6356-4327-83b3-d9894292325d","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"710f8ed4-c86b-49f7-a028-61263128a8d0","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01KW4dNbY2gwn2J6jb42HJ2c","type":"message","role":"assistant","content":[{"type":"text","text":"No changes to checkpoint.go or metricstore.go in recent commits. Let me look at what changed between the working and broken state more carefully."}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":433,"cache_read_input_tokens":24360,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":433},"output_tokens":1,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZPDLrTt7C3SCnvgyWBNh","type":"assistant","uuid":"d3e846f9-f2d9-46f5-b7f7-7f069d12114f","timestamp":"2026-03-25T05:03:38.100Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"d3e846f9-f2d9-46f5-b7f7-7f069d12114f","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01KW4dNbY2gwn2J6jb42HJ2c","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01PnEdHCcdn23GcCD1dK84xL","name":"Bash","input":{"command":"git log --oneline --all --since=\"2026-03-23\" -- pkg/metricstore/","description":"All recent metricstore 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for WAL writers\ne41d1251 fix: Continue on error\n586c9020 Restructure metricstore cleanup archiving to stay withinh 32k parquet-go limit","is_error":false}]},"uuid":"cd098acd-785d-4f5a-859e-4710fa4aeec1","timestamp":"2026-03-25T05:03:39.071Z","toolUseResult":{"stdout":"6f7dda53 Cleanup\n0325d9e8 fix: Increase throughput for WAL writers\ne41d1251 fix: Continue on error\n586c9020 Restructure metricstore cleanup archiving to stay withinh 32k parquet-go limit","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false},"sourceToolAssistantUUID":"172c0bd4-ef5b-4a43-a9b0-c31203b5e1b2","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} 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{"parentUuid":"d10dc7e1-fa5c-4a9a-9c82-888ebec301dd","isSidechain":false,"type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:Read","command":"callback"},"parentToolUseID":"toolu_01PpqZ5VrzXYyqajwPUHmgTR","toolUseID":"toolu_01PpqZ5VrzXYyqajwPUHmgTR","timestamp":"2026-03-25T05:03:39.644Z","uuid":"425a840a-3823-41bc-938e-6dbec312784a","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"d10dc7e1-fa5c-4a9a-9c82-888ebec301dd","isSidechain":false,"promptId":"32125b75-4928-41fc-805e-168a61de928f","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01PpqZ5VrzXYyqajwPUHmgTR","type":"tool_result","content":" 1→// Copyright (C) NHR@FAU, University Erlangen-Nuremberg.\n 2→// All rights reserved. This file is part of cc-backend.\n 3→// Use of this source code is governed by a MIT-style\n 4→// license that can be found in the LICENSE file.\n 5→\n 6→// This file implements checkpoint persistence for the in-memory metric store.\n 7→//\n 8→// Checkpoints enable graceful restarts by periodically saving in-memory metric\n 9→// data to disk in JSON or binary format. The checkpoint system:\n 10→//\n 11→// Key Features:\n 12→// - Periodic background checkpointing via the Checkpointing() worker\n 13→// - Two format families: JSON (human-readable) and WAL+binary (compact, crash-safe)\n 14→// - Parallel checkpoint creation and loading using worker pools\n 15→// - Hierarchical file organization: checkpoint_dir/cluster/host/timestamp.{json|bin}\n 16→// - WAL file: checkpoint_dir/cluster/host/current.wal (append-only, per-entry)\n 17→// - Only saves unarchived data (archived data is already persisted elsewhere)\n 18→// - GC optimization during loading to prevent excessive heap growth\n 19→//\n 20→// Checkpoint Workflow:\n 21→// 1. Init() loads checkpoints within retention window at startup\n 22→// 2. Checkpointing() worker periodically saves new data\n 23→// 3. Shutdown() writes final checkpoint before exit\n 24→//\n 25→// File Organization:\n 26→//\n 27→//\tcheckpoints/\n 28→//\t cluster1/\n 29→//\t host001/\n 30→//\t 1234567890.json (JSON format: full subtree snapshot)\n 31→//\t 1234567890.bin (binary format: full subtree snapshot)\n 32→//\t current.wal (WAL format: append-only per-entry log)\n 33→//\t host002/\n 34→//\t ...\n 35→package metricstore\n 36→\n 37→import (\n 38→\t\"bufio\"\n 39→\t\"context\"\n 40→\t\"encoding/json\"\n 41→\t\"errors\"\n 42→\t\"fmt\"\n 43→\t\"io/fs\"\n 44→\t\"os\"\n 45→\t\"path\"\n 46→\t\"path/filepath\"\n 47→\t\"sort\"\n 48→\t\"strconv\"\n 49→\t\"strings\"\n 50→\t\"sync\""}]},"uuid":"99fc4358-c3a4-4b77-9ea5-68a875ca4cac","timestamp":"2026-03-25T05:03:39.644Z","toolUseResult":{"type":"text","file":{"filePath":"/Users/jan/prg/ClusterCockpit/cc-backend/pkg/metricstore/checkpoint.go","content":"// Copyright (C) NHR@FAU, University Erlangen-Nuremberg.\n// All rights reserved. This file is part of cc-backend.\n// Use of this source code is governed by a MIT-style\n// license that can be found in the LICENSE file.\n\n// This file implements checkpoint persistence for the in-memory metric store.\n//\n// Checkpoints enable graceful restarts by periodically saving in-memory metric\n// data to disk in JSON or binary format. The checkpoint system:\n//\n// Key Features:\n// - Periodic background checkpointing via the Checkpointing() worker\n// - Two format families: JSON (human-readable) and WAL+binary (compact, crash-safe)\n// - Parallel checkpoint creation and loading using worker pools\n// - Hierarchical file organization: checkpoint_dir/cluster/host/timestamp.{json|bin}\n// - WAL file: checkpoint_dir/cluster/host/current.wal (append-only, per-entry)\n// - Only saves unarchived data (archived data is already persisted elsewhere)\n// - GC optimization during loading to prevent excessive heap growth\n//\n// Checkpoint Workflow:\n// 1. Init() loads checkpoints within retention window at startup\n// 2. Checkpointing() worker periodically saves new data\n// 3. Shutdown() writes final checkpoint before exit\n//\n// File Organization:\n//\n//\tcheckpoints/\n//\t cluster1/\n//\t host001/\n//\t 1234567890.json (JSON format: full subtree snapshot)\n//\t 1234567890.bin (binary format: full subtree snapshot)\n//\t current.wal (WAL format: append-only per-entry log)\n//\t host002/\n//\t ...\npackage metricstore\n\nimport (\n\t\"bufio\"\n\t\"context\"\n\t\"encoding/json\"\n\t\"errors\"\n\t\"fmt\"\n\t\"io/fs\"\n\t\"os\"\n\t\"path\"\n\t\"path/filepath\"\n\t\"sort\"\n\t\"strconv\"\n\t\"strings\"\n\t\"sync\"","numLines":50,"startLine":1,"totalLines":670}},"sourceToolAssistantUUID":"d10dc7e1-fa5c-4a9a-9c82-888ebec301dd","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} 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{"parentUuid":"c970595c-350e-4250-8804-4e13a5fce07e","isSidechain":false,"type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:Read","command":"callback"},"parentToolUseID":"toolu_01BJW8Vt4W7dv2a5xGWyXa7M","toolUseID":"toolu_01BJW8Vt4W7dv2a5xGWyXa7M","timestamp":"2026-03-25T05:03:42.562Z","uuid":"c5cc93c1-b580-482c-bdb1-f7045828f0d0","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"c970595c-350e-4250-8804-4e13a5fce07e","isSidechain":false,"promptId":"32125b75-4928-41fc-805e-168a61de928f","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01BJW8Vt4W7dv2a5xGWyXa7M","type":"tool_result","content":" 50→\t\"sync\"\n 51→\t\"sync/atomic\"\n 52→\t\"time\"\n 53→\n 54→\tcclog \"github.com/ClusterCockpit/cc-lib/v2/ccLogger\"\n 55→\t\"github.com/ClusterCockpit/cc-lib/v2/schema\"\n 56→)\n 57→\n 58→const (\n 59→\tCheckpointFilePerms = 0o644 // File permissions for checkpoint files\n 60→\tCheckpointDirPerms = 0o755 // Directory permissions for checkpoint directories\n 61→\tGCTriggerInterval = DefaultGCTriggerInterval // Interval for triggering GC during checkpoint loading\n 62→)\n 63→\n 64→// CheckpointMetrics represents metric data in a checkpoint file.\n 65→// Whenever the structure changes, update MarshalJSON as well!\n 66→type CheckpointMetrics struct {\n 67→\tData []schema.Float `json:\"data\"`\n 68→\tFrequency int64 `json:\"frequency\"`\n 69→\tStart int64 `json:\"start\"`\n 70→}\n 71→\n 72→// CheckpointFile represents the hierarchical structure of a checkpoint file.\n 73→// It mirrors the Level tree structure from the MemoryStore.\n 74→type CheckpointFile struct {\n 75→\tMetrics map[string]*CheckpointMetrics `json:\"metrics\"`\n 76→\tChildren map[string]*CheckpointFile `json:\"children\"`\n 77→\tFrom int64 `json:\"from\"`\n 78→\tTo int64 `json:\"to\"`\n 79→}\n 80→\n 81→// lastCheckpoint tracks the timestamp of the last checkpoint creation.\n 82→var (\n 83→\tlastCheckpoint time.Time\n 84→\tlastCheckpointMu sync.Mutex\n 85→)\n 86→\n 87→// Checkpointing starts a background worker that periodically saves metric data to disk.\n 88→//\n 89→// Checkpoints are written every 12 hours (hardcoded).\n 90→//\n 91→// Format behaviour:\n 92→// - \"json\": Periodic checkpointing every checkpointInterval\n 93→// - \"wal\": Periodic binary snapshots + WAL rotation every checkpointInterval\n 94→func Checkpointing(wg *sync.WaitGroup, ctx context.Context) {\n 95→\tlastCheckpointMu.Lock()\n 96→\tlastCheckpoint = time.Now()\n 97→\tlastCheckpointMu.Unlock()\n 98→\n 99→\tms := GetMemoryStore()\n 100→\n 101→\twg.Go(func() {\n 102→\n 103→\t\td := 12 * time.Hour // default checkpoint interval\n 104→\t\tif Keys.CheckpointInterval != \"\" {\n 105→\t\t\tparsed, err := time.ParseDuration(Keys.CheckpointInterval)\n 106→\t\t\tif err != nil {\n 107→\t\t\t\tcclog.Errorf(\"[METRICSTORE]> invalid checkpoint-interval %q: %s, using default 12h\", Keys.CheckpointInterval, err)\n 108→\t\t\t} else {\n 109→\t\t\t\td = parsed\n 110→\t\t\t}\n 111→\t\t}\n 112→\n 113→\t\tticker := time.NewTicker(d)\n 114→\t\tdefer ticker.Stop()\n 115→\n 116→\t\tfor {\n 117→\t\t\tselect {\n 118→\t\t\tcase <-ctx.Done():\n 119→\t\t\t\treturn\n 120→\t\t\tcase <-ticker.C:\n 121→\t\t\t\tlastCheckpointMu.Lock()\n 122→\t\t\t\tfrom := lastCheckpoint\n 123→\t\t\t\tlastCheckpointMu.Unlock()\n 124→\n 125→\t\t\t\tnow := time.Now()\n 126→\t\t\t\tcclog.Infof(\"[METRICSTORE]> start checkpointing (starting at %s)...\", from.Format(time.RFC3339))\n 127→\n 128→\t\t\t\tif Keys.Checkpoints.FileFormat == \"wal\" {\n 129→\t\t\t\t\tn, hostDirs, err := ms.ToCheckpointWAL(Keys.Checkpoints.RootDir, from.Unix(), now.Unix())\n 130→\t\t\t\t\tif err != nil {\n 131→\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> binary checkpointing failed: %s\", err.Error())\n 132→\t\t\t\t\t} else {\n 133→\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d binary snapshot files created\", n)\n 134→\t\t\t\t\t\tlastCheckpointMu.Lock()\n 135→\t\t\t\t\t\tlastCheckpoint = now\n 136→\t\t\t\t\t\tlastCheckpointMu.Unlock()\n 137→\t\t\t\t\t\t// Rotate WAL files for successfully checkpointed hosts.\n 138→\t\t\t\t\t\tRotateWALFiles(hostDirs)\n 139→\t\t\t\t\t}\n 140→\t\t\t\t} else {\n 141→\t\t\t\t\tn, err := ms.ToCheckpoint(Keys.Checkpoints.RootDir, from.Unix(), now.Unix())\n 142→\t\t\t\t\tif err != nil {\n 143→\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> checkpointing failed: %s\", err.Error())\n 144→\t\t\t\t\t} else {\n 145→\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d checkpoint files created\", n)\n 146→\t\t\t\t\t\tlastCheckpointMu.Lock()\n 147→\t\t\t\t\t\tlastCheckpoint = now\n 148→\t\t\t\t\t\tlastCheckpointMu.Unlock()\n 149→\t\t\t\t\t}"}]},"uuid":"0e85a45d-e5b9-4d49-88fc-85facd6e1630","timestamp":"2026-03-25T05:03:42.561Z","toolUseResult":{"type":"text","file":{"filePath":"/Users/jan/prg/ClusterCockpit/cc-backend/pkg/metricstore/checkpoint.go","content":"\t\"sync\"\n\t\"sync/atomic\"\n\t\"time\"\n\n\tcclog \"github.com/ClusterCockpit/cc-lib/v2/ccLogger\"\n\t\"github.com/ClusterCockpit/cc-lib/v2/schema\"\n)\n\nconst (\n\tCheckpointFilePerms = 0o644 // File permissions for checkpoint files\n\tCheckpointDirPerms = 0o755 // Directory permissions for checkpoint directories\n\tGCTriggerInterval = DefaultGCTriggerInterval // Interval for triggering GC during checkpoint loading\n)\n\n// CheckpointMetrics represents metric data in a checkpoint file.\n// Whenever the structure changes, update MarshalJSON as well!\ntype CheckpointMetrics struct {\n\tData []schema.Float `json:\"data\"`\n\tFrequency int64 `json:\"frequency\"`\n\tStart int64 `json:\"start\"`\n}\n\n// CheckpointFile represents the hierarchical structure of a checkpoint file.\n// It mirrors the Level tree structure from the MemoryStore.\ntype CheckpointFile struct {\n\tMetrics map[string]*CheckpointMetrics `json:\"metrics\"`\n\tChildren map[string]*CheckpointFile `json:\"children\"`\n\tFrom int64 `json:\"from\"`\n\tTo int64 `json:\"to\"`\n}\n\n// lastCheckpoint tracks the timestamp of the last checkpoint creation.\nvar (\n\tlastCheckpoint time.Time\n\tlastCheckpointMu sync.Mutex\n)\n\n// Checkpointing starts a background worker that periodically saves metric data to disk.\n//\n// Checkpoints are written every 12 hours (hardcoded).\n//\n// Format behaviour:\n// - \"json\": Periodic checkpointing every checkpointInterval\n// - \"wal\": Periodic binary snapshots + WAL rotation every checkpointInterval\nfunc Checkpointing(wg *sync.WaitGroup, ctx context.Context) {\n\tlastCheckpointMu.Lock()\n\tlastCheckpoint = time.Now()\n\tlastCheckpointMu.Unlock()\n\n\tms := GetMemoryStore()\n\n\twg.Go(func() {\n\n\t\td := 12 * time.Hour // default checkpoint interval\n\t\tif Keys.CheckpointInterval != \"\" {\n\t\t\tparsed, err := time.ParseDuration(Keys.CheckpointInterval)\n\t\t\tif err != nil {\n\t\t\t\tcclog.Errorf(\"[METRICSTORE]> invalid checkpoint-interval %q: %s, using default 12h\", Keys.CheckpointInterval, err)\n\t\t\t} else {\n\t\t\t\td = parsed\n\t\t\t}\n\t\t}\n\n\t\tticker := time.NewTicker(d)\n\t\tdefer ticker.Stop()\n\n\t\tfor {\n\t\t\tselect {\n\t\t\tcase <-ctx.Done():\n\t\t\t\treturn\n\t\t\tcase <-ticker.C:\n\t\t\t\tlastCheckpointMu.Lock()\n\t\t\t\tfrom := lastCheckpoint\n\t\t\t\tlastCheckpointMu.Unlock()\n\n\t\t\t\tnow := time.Now()\n\t\t\t\tcclog.Infof(\"[METRICSTORE]> start checkpointing (starting at %s)...\", from.Format(time.RFC3339))\n\n\t\t\t\tif Keys.Checkpoints.FileFormat == \"wal\" {\n\t\t\t\t\tn, hostDirs, err := ms.ToCheckpointWAL(Keys.Checkpoints.RootDir, from.Unix(), now.Unix())\n\t\t\t\t\tif err != nil {\n\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> binary checkpointing failed: %s\", err.Error())\n\t\t\t\t\t} else {\n\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d binary snapshot files created\", n)\n\t\t\t\t\t\tlastCheckpointMu.Lock()\n\t\t\t\t\t\tlastCheckpoint = now\n\t\t\t\t\t\tlastCheckpointMu.Unlock()\n\t\t\t\t\t\t// Rotate WAL files for successfully checkpointed hosts.\n\t\t\t\t\t\tRotateWALFiles(hostDirs)\n\t\t\t\t\t}\n\t\t\t\t} else {\n\t\t\t\t\tn, err := ms.ToCheckpoint(Keys.Checkpoints.RootDir, from.Unix(), now.Unix())\n\t\t\t\t\tif err != nil {\n\t\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> checkpointing failed: %s\", err.Error())\n\t\t\t\t\t} else {\n\t\t\t\t\t\tcclog.Infof(\"[METRICSTORE]> done: %d checkpoint files created\", n)\n\t\t\t\t\t\tlastCheckpointMu.Lock()\n\t\t\t\t\t\tlastCheckpoint = now\n\t\t\t\t\t\tlastCheckpointMu.Unlock()\n\t\t\t\t\t}","numLines":100,"startLine":50,"totalLines":670}},"sourceToolAssistantUUID":"c970595c-350e-4250-8804-4e13a5fce07e","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} 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Keys.NumWorkers*4)\n 398→\tn, errs := int32(0), int32(0)\n 399→\n 400→\twg.Add(Keys.NumWorkers)\n 401→\tfor worker := 0; worker < Keys.NumWorkers; worker++ {\n 402→\t\tgo func() {\n 403→\t\t\tdefer wg.Done()\n 404→\t\t\tfor host := range work {\n 405→\t\t\t\tlvl := m.root.findLevelOrCreate(host[:], len(m.Metrics))\n 406→\t\t\t\tnn, err := lvl.fromCheckpoint(m, filepath.Join(dir, host[0], host[1]), from)\n 407→\t\t\t\tif err != nil {\n 408→\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> error while loading checkpoints for %s/%s: %s\", host[0], host[1], err.Error())\n 409→\t\t\t\t\tatomic.AddInt32(&errs, 1)\n 410→\t\t\t\t}\n 411→\t\t\t\tatomic.AddInt32(&n, int32(nn))\n 412→\t\t\t}\n 413→\t\t}()\n 414→\t}\n 415→\n 416→\terr := enqueueCheckpointHosts(dir, work)\n 417→\tclose(work)\n 418→\twg.Wait()\n 419→\n 420→\tif err != nil {\n 421→\t\treturn int(n), err\n 422→\t}\n 423→\n 424→\tif errs > 0 {\n 425→\t\treturn int(n), fmt.Errorf(\"[METRICSTORE]> %d errors happened while creating checkpoints (%d successes)\", errs, n)\n 426→\t}\n 427→\treturn int(n), nil\n 428→}\n 429→\n 430→// FromCheckpointFiles is the main entry point for loading checkpoints at startup.\n 431→//\n 432→// Creates checkpoint directory if it doesn't exist. This function must be called\n 433→// before any writes or reads, and can only be called once.\n 434→func (m *MemoryStore) FromCheckpointFiles(dir string, from int64) (int, error) {\n 435→\tif _, err := os.Stat(dir); os.IsNotExist(err) {\n 436→\t\terr := os.MkdirAll(dir, CheckpointDirPerms)\n 437→\t\tif err != nil {\n 438→\t\t\tcclog.Fatalf(\"[METRICSTORE]> Error creating directory: %#v\\n\", err)\n 439→\t\t}\n 440→\t\tcclog.Debugf(\"[METRICSTORE]> %#v Directory created successfully\", dir)\n 441→\t}\n 442→\n 443→\treturn m.FromCheckpoint(dir, from)\n 444→}\n 445→\n 446→func (l *Level) loadJSONFile(m *MemoryStore, f *os.File, from int64) error {\n 447→\tbr := bufio.NewReader(f)\n 448→\tcf := &CheckpointFile{}\n 449→\tif err := json.NewDecoder(br).Decode(cf); err != nil {\n 450→\t\treturn err\n 451→\t}\n 452→\n 453→\tif cf.To != 0 && cf.To < from {\n 454→\t\treturn nil\n 455→\t}\n 456→\n 457→\tif err := l.loadFile(cf, m); err != nil {\n 458→\t\treturn err\n 459→\t}\n 460→\n 461→\treturn nil\n 462→}\n 463→\n 464→func (l *Level) loadFile(cf *CheckpointFile, m *MemoryStore) error {\n 465→\tfor name, metric := range cf.Metrics {\n 466→\t\tn := len(metric.Data)\n 467→\t\tb := &buffer{\n 468→\t\t\tfrequency: metric.Frequency,\n 469→\t\t\tstart: metric.Start,\n 470→\t\t\tdata: metric.Data[0:n:n],\n 471→\t\t\tprev: nil,\n 472→\t\t\tnext: nil,\n 473→\t\t\tarchived: true,\n 474→\t\t}\n 475→\n 476→\t\tminfo, ok := m.Metrics[name]\n 477→\t\tif !ok {\n 478→\t\t\tcontinue\n 479→\t\t}\n 480→\n 481→\t\tprev := l.metrics[minfo.offset]\n 482→\t\tif prev == nil {\n 483→\t\t\tl.metrics[minfo.offset] = b\n 484→\t\t} else {\n 485→\t\t\tif prev.start > b.start {\n 486→\t\t\t\treturn fmt.Errorf(\"[METRICSTORE]> buffer start time %d is before previous buffer start %d\", b.start, prev.start)\n 487→\t\t\t}\n 488→\n 489→\t\t\tb.prev = prev\n 490→\t\t\tprev.next = b\n 491→\t\t}\n 492→\t\tl.metrics[minfo.offset] = b\n 493→\t}\n 494→\n 495→\tif len(cf.Children) > 0 && l.children == nil {\n 496→\t\tl.children = make(map[string]*Level)\n 497→\t}\n 498→\n 499→\tfor sel, childCf := range cf.Children {\n 500→\t\tchild, ok := l.children[sel]\n 501→\t\tif !ok {\n 502→\t\t\tchild = &Level{\n 503→\t\t\t\tmetrics: make([]*buffer, len(m.Metrics)),\n 504→\t\t\t\tchildren: nil,\n 505→\t\t\t}\n 506→\t\t\tl.children[sel] = child\n 507→\t\t}\n 508→\n 509→\t\tif err := child.loadFile(childCf, m); err != nil {\n 510→\t\t\treturn err\n 511→\t\t}\n 512→\t}\n 513→\n 514→\treturn nil"}]},"uuid":"f3e59359-afb8-4aae-b702-0268560d34c7","timestamp":"2026-03-25T05:04:01.021Z","toolUseResult":{"type":"text","file":{"filePath":"/Users/jan/prg/ClusterCockpit/cc-backend/pkg/metricstore/checkpoint.go","content":"func (m *MemoryStore) FromCheckpoint(dir string, from int64) (int, error) {\n\tvar wg sync.WaitGroup\n\twork := make(chan [2]string, Keys.NumWorkers*4)\n\tn, errs := int32(0), int32(0)\n\n\twg.Add(Keys.NumWorkers)\n\tfor worker := 0; worker < Keys.NumWorkers; worker++ {\n\t\tgo func() {\n\t\t\tdefer wg.Done()\n\t\t\tfor host := range work {\n\t\t\t\tlvl := m.root.findLevelOrCreate(host[:], len(m.Metrics))\n\t\t\t\tnn, err := lvl.fromCheckpoint(m, filepath.Join(dir, host[0], host[1]), from)\n\t\t\t\tif err != nil {\n\t\t\t\t\tcclog.Errorf(\"[METRICSTORE]> error while loading checkpoints for %s/%s: %s\", host[0], host[1], err.Error())\n\t\t\t\t\tatomic.AddInt32(&errs, 1)\n\t\t\t\t}\n\t\t\t\tatomic.AddInt32(&n, int32(nn))\n\t\t\t}\n\t\t}()\n\t}\n\n\terr := enqueueCheckpointHosts(dir, work)\n\tclose(work)\n\twg.Wait()\n\n\tif err != nil {\n\t\treturn int(n), err\n\t}\n\n\tif errs > 0 {\n\t\treturn int(n), fmt.Errorf(\"[METRICSTORE]> %d errors happened while creating checkpoints (%d successes)\", errs, n)\n\t}\n\treturn int(n), nil\n}\n\n// FromCheckpointFiles is the main entry point for loading checkpoints at startup.\n//\n// Creates checkpoint directory if it doesn't exist. This function must be called\n// before any writes or reads, and can only be called once.\nfunc (m *MemoryStore) FromCheckpointFiles(dir string, from int64) (int, error) {\n\tif _, err := os.Stat(dir); os.IsNotExist(err) {\n\t\terr := os.MkdirAll(dir, CheckpointDirPerms)\n\t\tif err != nil {\n\t\t\tcclog.Fatalf(\"[METRICSTORE]> Error creating directory: %#v\\n\", err)\n\t\t}\n\t\tcclog.Debugf(\"[METRICSTORE]> %#v Directory created successfully\", dir)\n\t}\n\n\treturn m.FromCheckpoint(dir, from)\n}\n\nfunc (l *Level) loadJSONFile(m *MemoryStore, f *os.File, from int64) error {\n\tbr := bufio.NewReader(f)\n\tcf := &CheckpointFile{}\n\tif err := json.NewDecoder(br).Decode(cf); err != nil {\n\t\treturn err\n\t}\n\n\tif cf.To != 0 && cf.To < from {\n\t\treturn nil\n\t}\n\n\tif err := l.loadFile(cf, m); err != nil {\n\t\treturn err\n\t}\n\n\treturn nil\n}\n\nfunc (l *Level) loadFile(cf *CheckpointFile, m *MemoryStore) error {\n\tfor name, metric := range cf.Metrics {\n\t\tn := len(metric.Data)\n\t\tb := &buffer{\n\t\t\tfrequency: metric.Frequency,\n\t\t\tstart: metric.Start,\n\t\t\tdata: metric.Data[0:n:n],\n\t\t\tprev: nil,\n\t\t\tnext: nil,\n\t\t\tarchived: true,\n\t\t}\n\n\t\tminfo, ok := m.Metrics[name]\n\t\tif !ok {\n\t\t\tcontinue\n\t\t}\n\n\t\tprev := l.metrics[minfo.offset]\n\t\tif prev == nil {\n\t\t\tl.metrics[minfo.offset] = b\n\t\t} else {\n\t\t\tif prev.start > b.start {\n\t\t\t\treturn fmt.Errorf(\"[METRICSTORE]> buffer start time %d is before previous buffer start %d\", b.start, prev.start)\n\t\t\t}\n\n\t\t\tb.prev = prev\n\t\t\tprev.next = b\n\t\t}\n\t\tl.metrics[minfo.offset] = b\n\t}\n\n\tif len(cf.Children) > 0 && l.children == nil {\n\t\tl.children = make(map[string]*Level)\n\t}\n\n\tfor sel, childCf := range cf.Children {\n\t\tchild, ok := l.children[sel]\n\t\tif !ok {\n\t\t\tchild = &Level{\n\t\t\t\tmetrics: make([]*buffer, len(m.Metrics)),\n\t\t\t\tchildren: nil,\n\t\t\t}\n\t\t\tl.children[sel] = child\n\t\t}\n\n\t\tif err := child.loadFile(childCf, m); err != nil {\n\t\t\treturn err\n\t\t}\n\t}\n\n\treturn nil","numLines":120,"startLine":395,"totalLines":670}},"sourceToolAssistantUUID":"0d212d8d-550f-432d-b685-229ef9ca68a2","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"f3e59359-afb8-4aae-b702-0268560d34c7","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_013wQMP64LZkRKa1z8EPnLa9","type":"message","role":"assistant","content":[{"type":"text","text":"Now let me look at the `fromCheckpoint` function (lowercase) which is what actually loads files per host:"}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":1636,"cache_read_input_tokens":29067,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":1636},"output_tokens":8,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZPDNnHuusFofUnBgd5v7","type":"assistant","uuid":"fd601e94-af82-4aad-ac11-b213451aacbd","timestamp":"2026-03-25T05:04:04.119Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} 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{"}]},"uuid":"52f89f1d-270f-4dfa-b4d5-e0df93ecc776","timestamp":"2026-03-25T05:04:04.969Z","toolUseResult":{"mode":"content","numFiles":0,"filenames":[],"content":"pkg/metricstore/checkpoint.go:520:func (l *Level) fromCheckpoint(m *MemoryStore, dir string, from int64) (int, error) {","numLines":1},"sourceToolAssistantUUID":"7957ef24-a9d7-4764-9439-5a0353e44979","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} 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{"parentUuid":"0ba97aa2-dec5-48e7-98ff-bd7d44c7cd31","isSidechain":false,"type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:Read","command":"callback"},"parentToolUseID":"toolu_01N2CUifAkAdVkaSEmx5L2Ff","toolUseID":"toolu_01N2CUifAkAdVkaSEmx5L2Ff","timestamp":"2026-03-25T05:04:07.749Z","uuid":"260f8505-0622-488c-8811-b65fdade06c0","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"0ba97aa2-dec5-48e7-98ff-bd7d44c7cd31","isSidechain":false,"promptId":"32125b75-4928-41fc-805e-168a61de928f","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01N2CUifAkAdVkaSEmx5L2Ff","type":"tool_result","content":" 520→func (l *Level) fromCheckpoint(m *MemoryStore, dir string, from int64) (int, error) {\n 521→\tdirentries, err := os.ReadDir(dir)\n 522→\tif err != nil {\n 523→\t\tif os.IsNotExist(err) {\n 524→\t\t\treturn 0, nil\n 525→\t\t}\n 526→\t\treturn 0, err\n 527→\t}\n 528→\n 529→\tallFiles := make([]fs.DirEntry, 0)\n 530→\tvar walEntry fs.DirEntry\n 531→\tfilesLoaded := 0\n 532→\n 533→\tfor _, e := range direntries {\n 534→\t\tif e.IsDir() {\n 535→\t\t\t// Legacy: skip subdirectories (only used by old Avro format).\n 536→\t\t\t// These are ignored; their data is not loaded.\n 537→\t\t\tcclog.Debugf(\"[METRICSTORE]> skipping subdirectory %s in checkpoint dir %s\", e.Name(), dir)\n 538→\t\t\tcontinue\n 539→\t\t}\n 540→\n 541→\t\tname := e.Name()\n 542→\t\tif strings.HasSuffix(name, \".json\") || strings.HasSuffix(name, \".bin\") {\n 543→\t\t\tallFiles = append(allFiles, e)\n 544→\t\t} else if name == \"current.wal\" {\n 545→\t\t\twalEntry = e\n 546→\t\t}\n 547→\t\t// Silently ignore other files (e.g., .tmp, .bin.tmp from interrupted writes).\n 548→\t}\n 549→\n 550→\tfiles, err := findFiles(allFiles, from, true)\n 551→\tif err != nil {\n 552→\t\treturn filesLoaded, err\n 553→\t}\n 554→\n 555→\tloaders := map[string]func(*MemoryStore, *os.File, int64) error{\n 556→\t\t\".json\": l.loadJSONFile,\n 557→\t\t\".bin\": l.loadBinaryFile,\n 558→\t}\n 559→\n 560→\tfor _, filename := range files {\n 561→\t\text := filepath.Ext(filename)\n 562→\t\tloader := loaders[ext]\n 563→\t\tif loader == nil {\n 564→\t\t\tcclog.Warnf(\"[METRICSTORE]> unknown extension for checkpoint file %s\", filename)\n 565→\t\t\tcontinue\n 566→\t\t}\n 567→\n 568→\t\terr := func() error {\n 569→\t\t\tf, err := os.Open(path.Join(dir, filename))\n 570→\t\t\tif err != nil {\n 571→\t\t\t\treturn err\n 572→\t\t\t}\n 573→\t\t\tdefer f.Close()\n 574→\t\t\treturn loader(m, f, from)\n 575→\t\t}()\n 576→\t\tif err != nil {\n 577→\t\t\treturn filesLoaded, err\n 578→\t\t}\n 579→\t\tfilesLoaded++\n 580→\t}\n 581→\n 582→\t// Replay WAL after all snapshot files so it fills in data since the last snapshot.\n 583→\tif walEntry != nil {\n 584→\t\terr := func() error {\n 585→\t\t\tf, err := os.Open(path.Join(dir, walEntry.Name()))\n 586→\t\t\tif err != nil {\n 587→\t\t\t\treturn err\n 588→\t\t\t}\n 589→\t\t\tdefer f.Close()\n 590→\t\t\treturn l.loadWALFile(m, f, from)\n 591→\t\t}()\n 592→\t\tif err != nil {\n 593→\t\t\t// WAL errors are non-fatal: the snapshot already loaded the bulk of data.\n 594→\t\t\tcclog.Warnf(\"[METRICSTORE]> WAL replay error for %s: %v (data since last snapshot may be missing)\", dir, err)\n 595→\t\t} else {\n 596→\t\t\tfilesLoaded++\n 597→\t\t}\n 598→\t}\n 599→\n 600→\treturn filesLoaded, nil\n 601→}\n 602→\n 603→// parseTimestampFromFilename extracts a Unix timestamp from a checkpoint filename.\n 604→// Supports \".json\" (format: \".json\") and \".bin\" (format: \".bin\").\n 605→func parseTimestampFromFilename(name string) (int64, error) {\n 606→\tswitch {\n 607→\tcase strings.HasSuffix(name, \".json\"):\n 608→\t\treturn strconv.ParseInt(name[:len(name)-5], 10, 64)\n 609→\tcase strings.HasSuffix(name, \".bin\"):\n 610→\t\treturn strconv.ParseInt(name[:len(name)-4], 10, 64)\n 611→\tdefault:\n 612→\t\treturn 0, fmt.Errorf(\"unknown checkpoint extension for file %q\", name)\n 613→\t}\n 614→}\n 615→\n 616→// findFiles returns filenames from direntries whose timestamps satisfy the filter.\n 617→// If findMoreRecentFiles is true, returns files with timestamps >= t (plus the\n 618→// last file before t if t falls between two files).\n 619→func findFiles(direntries []fs.DirEntry, t int64, findMoreRecentFiles bool) ([]string, error) {"}]},"uuid":"e346e8a5-581e-4d0c-b771-b2b6adec36f9","timestamp":"2026-03-25T05:04:07.749Z","toolUseResult":{"type":"text","file":{"filePath":"/Users/jan/prg/ClusterCockpit/cc-backend/pkg/metricstore/checkpoint.go","content":"func (l *Level) fromCheckpoint(m *MemoryStore, dir string, from int64) (int, error) {\n\tdirentries, err := os.ReadDir(dir)\n\tif err != nil {\n\t\tif os.IsNotExist(err) {\n\t\t\treturn 0, nil\n\t\t}\n\t\treturn 0, err\n\t}\n\n\tallFiles := make([]fs.DirEntry, 0)\n\tvar walEntry fs.DirEntry\n\tfilesLoaded := 0\n\n\tfor _, e := range direntries {\n\t\tif e.IsDir() {\n\t\t\t// Legacy: skip subdirectories (only used by old Avro format).\n\t\t\t// These are ignored; their data is not loaded.\n\t\t\tcclog.Debugf(\"[METRICSTORE]> skipping subdirectory %s in checkpoint dir %s\", e.Name(), dir)\n\t\t\tcontinue\n\t\t}\n\n\t\tname := e.Name()\n\t\tif strings.HasSuffix(name, \".json\") || strings.HasSuffix(name, \".bin\") {\n\t\t\tallFiles = append(allFiles, e)\n\t\t} else if name == \"current.wal\" {\n\t\t\twalEntry = e\n\t\t}\n\t\t// Silently ignore other files (e.g., .tmp, .bin.tmp from interrupted writes).\n\t}\n\n\tfiles, err := findFiles(allFiles, from, true)\n\tif err != nil {\n\t\treturn filesLoaded, err\n\t}\n\n\tloaders := map[string]func(*MemoryStore, *os.File, int64) error{\n\t\t\".json\": l.loadJSONFile,\n\t\t\".bin\": l.loadBinaryFile,\n\t}\n\n\tfor _, filename := range files {\n\t\text := filepath.Ext(filename)\n\t\tloader := loaders[ext]\n\t\tif loader == nil {\n\t\t\tcclog.Warnf(\"[METRICSTORE]> unknown extension for checkpoint file %s\", filename)\n\t\t\tcontinue\n\t\t}\n\n\t\terr := func() error {\n\t\t\tf, err := os.Open(path.Join(dir, filename))\n\t\t\tif err != nil {\n\t\t\t\treturn err\n\t\t\t}\n\t\t\tdefer f.Close()\n\t\t\treturn loader(m, f, from)\n\t\t}()\n\t\tif err != nil {\n\t\t\treturn filesLoaded, err\n\t\t}\n\t\tfilesLoaded++\n\t}\n\n\t// Replay WAL after all snapshot files so it fills in data since the last snapshot.\n\tif walEntry != nil {\n\t\terr := func() error {\n\t\t\tf, err := os.Open(path.Join(dir, walEntry.Name()))\n\t\t\tif err != nil {\n\t\t\t\treturn err\n\t\t\t}\n\t\t\tdefer f.Close()\n\t\t\treturn l.loadWALFile(m, f, from)\n\t\t}()\n\t\tif err != nil {\n\t\t\t// WAL errors are non-fatal: the snapshot already loaded the bulk of data.\n\t\t\tcclog.Warnf(\"[METRICSTORE]> WAL replay error for %s: %v (data since last snapshot may be missing)\", dir, err)\n\t\t} else {\n\t\t\tfilesLoaded++\n\t\t}\n\t}\n\n\treturn filesLoaded, nil\n}\n\n// parseTimestampFromFilename extracts a Unix timestamp from a checkpoint filename.\n// Supports \".json\" (format: \".json\") and \".bin\" (format: \".bin\").\nfunc parseTimestampFromFilename(name string) (int64, error) {\n\tswitch {\n\tcase strings.HasSuffix(name, \".json\"):\n\t\treturn strconv.ParseInt(name[:len(name)-5], 10, 64)\n\tcase strings.HasSuffix(name, \".bin\"):\n\t\treturn strconv.ParseInt(name[:len(name)-4], 10, 64)\n\tdefault:\n\t\treturn 0, fmt.Errorf(\"unknown checkpoint extension for file %q\", name)\n\t}\n}\n\n// findFiles returns filenames from direntries whose timestamps satisfy the filter.\n// If findMoreRecentFiles is true, returns files with timestamps >= t (plus the\n// last file before t if t falls between two files).\nfunc findFiles(direntries []fs.DirEntry, t int64, findMoreRecentFiles bool) ([]string, error) {","numLines":100,"startLine":520,"totalLines":670}},"sourceToolAssistantUUID":"0ba97aa2-dec5-48e7-98ff-bd7d44c7cd31","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"e346e8a5-581e-4d0c-b771-b2b6adec36f9","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01V6mVV5X2iejLaLvkhLiCaY","type":"message","role":"assistant","content":[{"type":"text","text":"Now let me look at `loadBinaryFile` and `loadWALFile`:"}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":1446,"cache_read_input_tokens":30916,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":1446},"output_tokens":5,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZPDPGsNhwFgYkiafjJX5","type":"assistant","uuid":"47dfbe1e-0315-4259-9732-aec111790843","timestamp":"2026-03-25T05:04:11.465Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"47dfbe1e-0315-4259-9732-aec111790843","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01V6mVV5X2iejLaLvkhLiCaY","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01SshcmcPfikAdXkx6993u82","name":"Grep","input":{"pattern":"func.*loadBinaryFile|func.*loadWALFile","path":"/Users/jan/prg/ClusterCockpit/cc-backend/pkg/metricstore","output_mode":"content","-n":true},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":1446,"cache_read_input_tokens":30916,"output_tokens":161,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":1446,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CZPDPGsNhwFgYkiafjJX5","type":"assistant","uuid":"b42ef9ac-e163-40cf-9ef0-61f0174032f4","timestamp":"2026-03-25T05:04:12.376Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"b42ef9ac-e163-40cf-9ef0-61f0174032f4","isSidechain":false,"type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:Grep","command":"callback"},"parentToolUseID":"toolu_01SshcmcPfikAdXkx6993u82","toolUseID":"toolu_01SshcmcPfikAdXkx6993u82","timestamp":"2026-03-25T05:04:12.397Z","uuid":"53d866f1-e734-44c8-ae21-587e086786b1","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"b42ef9ac-e163-40cf-9ef0-61f0174032f4","isSidechain":false,"promptId":"32125b75-4928-41fc-805e-168a61de928f","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01SshcmcPfikAdXkx6993u82","type":"tool_result","content":"pkg/metricstore/walCheckpoint.go:544:func (l *Level) loadWALFile(m *MemoryStore, f *os.File, from int64) error {\npkg/metricstore/walCheckpoint.go:811:func (l *Level) loadBinaryFile(m *MemoryStore, f *os.File, from int64) error {"}]},"uuid":"2622c9bd-5bfd-4ac0-bbd1-cae3a90f9398","timestamp":"2026-03-25T05:04:12.397Z","toolUseResult":{"mode":"content","numFiles":0,"filenames":[],"content":"pkg/metricstore/walCheckpoint.go:544:func (l *Level) loadWALFile(m *MemoryStore, f *os.File, from int64) error {\npkg/metricstore/walCheckpoint.go:811:func (l *Level) loadBinaryFile(m *MemoryStore, f *os.File, from int64) error {","numLines":2},"sourceToolAssistantUUID":"b42ef9ac-e163-40cf-9ef0-61f0174032f4","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"2622c9bd-5bfd-4ac0-bbd1-cae3a90f9398","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01YFMWKTp776WCWQQe6etUmc","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01Gz3gHxwcpBnqHiuJuYsioa","name":"Read","input":{"file_path":"/Users/jan/prg/ClusterCockpit/cc-backend/pkg/metricstore/walCheckpoint.go","offset":544,"limit":100},"caller":{"type":"direct"}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":467,"cache_read_input_tokens":32362,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":467},"output_tokens":72,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZPDPcmhj41aPx6y4sR9P","type":"assistant","uuid":"f9f93dc9-f195-4958-bf21-561fc8b1f5a3","timestamp":"2026-03-25T05:04:15.536Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"f9f93dc9-f195-4958-bf21-561fc8b1f5a3","isSidechain":false,"type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:Read","command":"callback"},"parentToolUseID":"toolu_01Gz3gHxwcpBnqHiuJuYsioa","toolUseID":"toolu_01Gz3gHxwcpBnqHiuJuYsioa","timestamp":"2026-03-25T05:04:15.554Z","uuid":"f8d98646-46e2-45a1-a2c9-259ccc724369","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"f9f93dc9-f195-4958-bf21-561fc8b1f5a3","isSidechain":false,"promptId":"32125b75-4928-41fc-805e-168a61de928f","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01Gz3gHxwcpBnqHiuJuYsioa","type":"tool_result","content":" 544→func (l *Level) loadWALFile(m *MemoryStore, f *os.File, from int64) error {\n 545→\tbr := bufio.NewReader(f)\n 546→\n 547→\t// Verify file header magic.\n 548→\tvar fileMagic uint32\n 549→\tif err := binary.Read(br, binary.LittleEndian, &fileMagic); err != nil {\n 550→\t\tif err == io.EOF {\n 551→\t\t\treturn nil // Empty file, no data\n 552→\t\t}\n 553→\t\treturn fmt.Errorf(\"[METRICSTORE]> WAL: read file header: %w\", err)\n 554→\t}\n 555→\n 556→\tif fileMagic != walFileMagic {\n 557→\t\treturn fmt.Errorf(\"[METRICSTORE]> WAL: invalid file magic 0x%08X (expected 0x%08X)\", fileMagic, walFileMagic)\n 558→\t}\n 559→\n 560→\t// Cache level lookups to avoid repeated tree traversal.\n 561→\tlvlCache := make(map[string]*Level)\n 562→\n 563→\tfor {\n 564→\t\tmsg, err := readWALRecord(br)\n 565→\t\tif err != nil {\n 566→\t\t\t// Truncated trailing record is expected after a crash; stop replaying.\n 567→\t\t\tcclog.Debugf(\"[METRICSTORE]> WAL: stopping replay at corrupted/partial record: %v\", err)\n 568→\t\t\tbreak\n 569→\t\t}\n 570→\t\tif msg == nil {\n 571→\t\t\tbreak // Clean EOF\n 572→\t\t}\n 573→\n 574→\t\tif msg.Timestamp < from {\n 575→\t\t\tcontinue // Older than retention window\n 576→\t\t}\n 577→\n 578→\t\tminfo, ok := m.Metrics[msg.MetricName]\n 579→\t\tif !ok {\n 580→\t\t\tcontinue // Unknown metric (config may have changed)\n 581→\t\t}\n 582→\n 583→\t\t// Cache key is the null-separated selector path.\n 584→\t\tcacheKey := joinSelector(msg.Selector)\n 585→\t\tlvl, ok := lvlCache[cacheKey]\n 586→\t\tif !ok {\n 587→\t\t\tlvl = l.findLevelOrCreate(msg.Selector, len(m.Metrics))\n 588→\t\t\tlvlCache[cacheKey] = lvl\n 589→\t\t}\n 590→\n 591→\t\t// Write directly to the buffer, same as WriteToLevel but without the\n 592→\t\t// global level lookup (we already have the right level).\n 593→\t\tlvl.lock.Lock()\n 594→\t\tb := lvl.metrics[minfo.offset]\n 595→\t\tif b == nil {\n 596→\t\t\tb = newBuffer(msg.Timestamp, minfo.Frequency)\n 597→\t\t\tlvl.metrics[minfo.offset] = b\n 598→\t\t}\n 599→\t\tnb, writeErr := b.write(msg.Timestamp, msg.Value)\n 600→\t\tif writeErr == nil && b != nb {\n 601→\t\t\tlvl.metrics[minfo.offset] = nb\n 602→\t\t}\n 603→\t\t// Ignore write errors for timestamps before buffer start (can happen when\n 604→\t\t// replaying WAL entries that predate a loaded snapshot's start time).\n 605→\t\tlvl.lock.Unlock()\n 606→\t}\n 607→\n 608→\treturn nil\n 609→}\n 610→\n 611→// joinSelector builds a cache key from a selector slice using null bytes as separators.\n 612→func joinSelector(sel []string) string {\n 613→\tif len(sel) == 0 {\n 614→\t\treturn \"\"\n 615→\t}\n 616→\tvar result strings.Builder\n 617→\tresult.WriteString(sel[0])\n 618→\tfor i := 1; i < len(sel); i++ {\n 619→\t\tresult.WriteString(\"\\x00\" + sel[i])\n 620→\t}\n 621→\treturn result.String()\n 622→}\n 623→\n 624→// ToCheckpointWAL writes binary snapshot files for all hosts in parallel.\n 625→// Returns the number of files written, the list of host directories that were\n 626→// successfully checkpointed (for WAL rotation), and any errors.\n 627→func (m *MemoryStore) ToCheckpointWAL(dir string, from, to int64) (int, []string, error) {\n 628→\t// Collect all cluster/host pairs.\n 629→\tm.root.lock.RLock()\n 630→\ttotalHosts := 0\n 631→\tfor _, l1 := range m.root.children {\n 632→\t\tl1.lock.RLock()\n 633→\t\ttotalHosts += len(l1.children)\n 634→\t\tl1.lock.RUnlock()\n 635→\t}\n 636→\tm.root.lock.RUnlock()\n 637→\n 638→\tlevels := make([]*Level, 0, totalHosts)\n 639→\tselectors := make([][]string, 0, totalHosts)\n 640→\n 641→\tm.root.lock.RLock()\n 642→\tfor sel1, l1 := range m.root.children {\n 643→\t\tl1.lock.RLock()"}]},"uuid":"9292e60f-d226-481d-9678-5c4bfc304805","timestamp":"2026-03-25T05:04:15.554Z","toolUseResult":{"type":"text","file":{"filePath":"/Users/jan/prg/ClusterCockpit/cc-backend/pkg/metricstore/walCheckpoint.go","content":"func (l *Level) loadWALFile(m *MemoryStore, f *os.File, from int64) error {\n\tbr := bufio.NewReader(f)\n\n\t// Verify file header magic.\n\tvar fileMagic uint32\n\tif err := binary.Read(br, binary.LittleEndian, &fileMagic); err != nil {\n\t\tif err == io.EOF {\n\t\t\treturn nil // Empty file, no data\n\t\t}\n\t\treturn fmt.Errorf(\"[METRICSTORE]> WAL: read file header: %w\", err)\n\t}\n\n\tif fileMagic != walFileMagic {\n\t\treturn fmt.Errorf(\"[METRICSTORE]> WAL: invalid file magic 0x%08X (expected 0x%08X)\", fileMagic, walFileMagic)\n\t}\n\n\t// Cache level lookups to avoid repeated tree traversal.\n\tlvlCache := make(map[string]*Level)\n\n\tfor {\n\t\tmsg, err := readWALRecord(br)\n\t\tif err != nil {\n\t\t\t// Truncated trailing record is expected after a crash; stop replaying.\n\t\t\tcclog.Debugf(\"[METRICSTORE]> WAL: stopping replay at corrupted/partial record: %v\", err)\n\t\t\tbreak\n\t\t}\n\t\tif msg == nil {\n\t\t\tbreak // Clean EOF\n\t\t}\n\n\t\tif msg.Timestamp < from {\n\t\t\tcontinue // Older than retention window\n\t\t}\n\n\t\tminfo, ok := m.Metrics[msg.MetricName]\n\t\tif !ok {\n\t\t\tcontinue // Unknown metric (config may have changed)\n\t\t}\n\n\t\t// Cache key is the null-separated selector path.\n\t\tcacheKey := joinSelector(msg.Selector)\n\t\tlvl, ok := lvlCache[cacheKey]\n\t\tif !ok {\n\t\t\tlvl = l.findLevelOrCreate(msg.Selector, len(m.Metrics))\n\t\t\tlvlCache[cacheKey] = lvl\n\t\t}\n\n\t\t// Write directly to the buffer, same as WriteToLevel but without the\n\t\t// global level lookup (we already have the right level).\n\t\tlvl.lock.Lock()\n\t\tb := lvl.metrics[minfo.offset]\n\t\tif b == nil {\n\t\t\tb = newBuffer(msg.Timestamp, minfo.Frequency)\n\t\t\tlvl.metrics[minfo.offset] = b\n\t\t}\n\t\tnb, writeErr := b.write(msg.Timestamp, msg.Value)\n\t\tif writeErr == nil && b != nb {\n\t\t\tlvl.metrics[minfo.offset] = nb\n\t\t}\n\t\t// Ignore write errors for timestamps before buffer start (can happen when\n\t\t// replaying WAL entries that predate a loaded snapshot's start time).\n\t\tlvl.lock.Unlock()\n\t}\n\n\treturn nil\n}\n\n// joinSelector builds a cache key from a selector slice using null bytes as separators.\nfunc joinSelector(sel []string) string {\n\tif len(sel) == 0 {\n\t\treturn \"\"\n\t}\n\tvar result strings.Builder\n\tresult.WriteString(sel[0])\n\tfor i := 1; i < len(sel); i++ {\n\t\tresult.WriteString(\"\\x00\" + sel[i])\n\t}\n\treturn result.String()\n}\n\n// ToCheckpointWAL writes binary snapshot files for all hosts in parallel.\n// Returns the number of files written, the list of host directories that were\n// successfully checkpointed (for WAL rotation), and any errors.\nfunc (m *MemoryStore) ToCheckpointWAL(dir string, from, to int64) (int, []string, error) {\n\t// Collect all cluster/host pairs.\n\tm.root.lock.RLock()\n\ttotalHosts := 0\n\tfor _, l1 := range m.root.children {\n\t\tl1.lock.RLock()\n\t\ttotalHosts += len(l1.children)\n\t\tl1.lock.RUnlock()\n\t}\n\tm.root.lock.RUnlock()\n\n\tlevels := make([]*Level, 0, totalHosts)\n\tselectors := make([][]string, 0, totalHosts)\n\n\tm.root.lock.RLock()\n\tfor sel1, l1 := range m.root.children {\n\t\tl1.lock.RLock()","numLines":100,"startLine":544,"totalLines":924}},"sourceToolAssistantUUID":"f9f93dc9-f195-4958-bf21-561fc8b1f5a3","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} 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{"parentUuid":"931197c3-e1f2-42d2-8a36-283b8f4d48aa","isSidechain":false,"type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:Read","command":"callback"},"parentToolUseID":"toolu_01TvyFPY3ERwafwdVf4yMYTX","toolUseID":"toolu_01TvyFPY3ERwafwdVf4yMYTX","timestamp":"2026-03-25T05:04:16.175Z","uuid":"76196a72-1651-41b7-9cc8-950de0eb6bd2","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"931197c3-e1f2-42d2-8a36-283b8f4d48aa","isSidechain":false,"promptId":"32125b75-4928-41fc-805e-168a61de928f","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01TvyFPY3ERwafwdVf4yMYTX","type":"tool_result","content":" 811→func (l *Level) loadBinaryFile(m *MemoryStore, f *os.File, from int64) error {\n 812→\tbr := bufio.NewReader(f)\n 813→\n 814→\tvar magic uint32\n 815→\tif err := binary.Read(br, binary.LittleEndian, &magic); err != nil {\n 816→\t\treturn fmt.Errorf(\"[METRICSTORE]> binary snapshot: read magic: %w\", err)\n 817→\t}\n 818→\tif magic != snapFileMagic {\n 819→\t\treturn fmt.Errorf(\"[METRICSTORE]> binary snapshot: invalid magic 0x%08X (expected 0x%08X)\", magic, snapFileMagic)\n 820→\t}\n 821→\n 822→\tvar fileFrom, fileTo int64\n 823→\tif err := binary.Read(br, binary.LittleEndian, &fileFrom); err != nil {\n 824→\t\treturn fmt.Errorf(\"[METRICSTORE]> binary snapshot: read from: %w\", err)\n 825→\t}\n 826→\tif err := binary.Read(br, binary.LittleEndian, &fileTo); err != nil {\n 827→\t\treturn fmt.Errorf(\"[METRICSTORE]> binary snapshot: read to: %w\", err)\n 828→\t}\n 829→\n 830→\tif fileTo != 0 && fileTo < from {\n 831→\t\treturn nil // File is older than retention window, skip it\n 832→\t}\n 833→\n 834→\tcf, err := readBinaryLevel(br)\n 835→\tif err != nil {\n 836→\t\treturn fmt.Errorf(\"[METRICSTORE]> binary snapshot: read level tree: %w\", err)\n 837→\t}\n 838→\tcf.From = fileFrom\n 839→\tcf.To = fileTo\n 840→\n 841→\treturn l.loadFile(cf, m)\n 842→}\n 843→\n 844→// readBinaryLevel recursively reads a level from the binary snapshot format.\n 845→func readBinaryLevel(r io.Reader) (*CheckpointFile, error) {\n 846→\tcf := &CheckpointFile{\n 847→\t\tMetrics: make(map[string]*CheckpointMetrics),\n 848→\t\tChildren: make(map[string]*CheckpointFile),\n 849→\t}\n 850→\n 851→\tvar numMetrics uint32\n 852→\tif err := binary.Read(r, binary.LittleEndian, &numMetrics); err != nil {\n 853→\t\treturn nil, fmt.Errorf(\"read num_metrics: %w\", err)\n 854→\t}\n 855→\n 856→\tfor range numMetrics {\n 857→\t\tname, err := readString16(r)\n 858→\t\tif err != nil {\n 859→\t\t\treturn nil, fmt.Errorf(\"read metric name: %w\", err)\n 860→\t\t}\n 861→\n 862→\t\tvar freq, start int64\n 863→\t\tif err := binary.Read(r, binary.LittleEndian, &freq); err != nil {\n 864→\t\t\treturn nil, fmt.Errorf(\"read frequency for %s: %w\", name, err)\n 865→\t\t}\n 866→\t\tif err := binary.Read(r, binary.LittleEndian, &start); err != nil {\n 867→\t\t\treturn nil, fmt.Errorf(\"read start for %s: %w\", name, err)\n 868→\t\t}\n 869→\n 870→\t\tvar numValues uint32\n 871→\t\tif err := binary.Read(r, binary.LittleEndian, &numValues); err != nil {\n 872→\t\t\treturn nil, fmt.Errorf(\"read num_values for %s: %w\", name, err)\n 873→\t\t}\n 874→\n 875→\t\tdata := make([]schema.Float, numValues)\n 876→\t\tfor i := range numValues {\n 877→\t\t\tvar bits uint32\n 878→\t\t\tif err := binary.Read(r, binary.LittleEndian, &bits); err != nil {\n 879→\t\t\t\treturn nil, fmt.Errorf(\"read value[%d] for %s: %w\", i, name, err)\n 880→\t\t\t}\n 881→\t\t\tdata[i] = schema.Float(math.Float32frombits(bits))\n 882→\t\t}\n 883→\n 884→\t\tcf.Metrics[name] = &CheckpointMetrics{\n 885→\t\t\tFrequency: freq,\n 886→\t\t\tStart: start,\n 887→\t\t\tData: data,\n 888→\t\t}\n 889→\t}\n 890→\n 891→\tvar numChildren uint32\n 892→\tif err := binary.Read(r, 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fmt.Errorf(\"[METRICSTORE]> binary snapshot: read magic: %w\", err)\n\t}\n\tif magic != snapFileMagic {\n\t\treturn fmt.Errorf(\"[METRICSTORE]> binary snapshot: invalid magic 0x%08X (expected 0x%08X)\", magic, snapFileMagic)\n\t}\n\n\tvar fileFrom, fileTo int64\n\tif err := binary.Read(br, binary.LittleEndian, &fileFrom); err != nil {\n\t\treturn fmt.Errorf(\"[METRICSTORE]> binary snapshot: read from: %w\", err)\n\t}\n\tif err := binary.Read(br, binary.LittleEndian, &fileTo); err != nil {\n\t\treturn fmt.Errorf(\"[METRICSTORE]> binary snapshot: read to: %w\", err)\n\t}\n\n\tif fileTo != 0 && fileTo < from {\n\t\treturn nil // File is older than retention window, skip it\n\t}\n\n\tcf, err := readBinaryLevel(br)\n\tif err != nil {\n\t\treturn fmt.Errorf(\"[METRICSTORE]> binary snapshot: read level tree: %w\", err)\n\t}\n\tcf.From = fileFrom\n\tcf.To = fileTo\n\n\treturn l.loadFile(cf, m)\n}\n\n// readBinaryLevel recursively reads a level from the binary snapshot format.\nfunc readBinaryLevel(r io.Reader) (*CheckpointFile, error) {\n\tcf := &CheckpointFile{\n\t\tMetrics: make(map[string]*CheckpointMetrics),\n\t\tChildren: make(map[string]*CheckpointFile),\n\t}\n\n\tvar numMetrics uint32\n\tif err := binary.Read(r, binary.LittleEndian, &numMetrics); err != nil {\n\t\treturn nil, fmt.Errorf(\"read num_metrics: %w\", err)\n\t}\n\n\tfor range numMetrics {\n\t\tname, err := readString16(r)\n\t\tif err != nil {\n\t\t\treturn nil, fmt.Errorf(\"read metric name: %w\", err)\n\t\t}\n\n\t\tvar freq, start int64\n\t\tif err := binary.Read(r, binary.LittleEndian, &freq); err != nil {\n\t\t\treturn nil, fmt.Errorf(\"read frequency for %s: %w\", name, err)\n\t\t}\n\t\tif err := binary.Read(r, binary.LittleEndian, &start); err != nil {\n\t\t\treturn nil, fmt.Errorf(\"read start for %s: %w\", name, err)\n\t\t}\n\n\t\tvar numValues uint32\n\t\tif err := binary.Read(r, binary.LittleEndian, &numValues); err != nil {\n\t\t\treturn nil, fmt.Errorf(\"read num_values for %s: %w\", 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But let me check if this code actually changed recently or if it was always like this."}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":3045,"cache_read_input_tokens":32829,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":3045},"output_tokens":8,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZPDPttZgBNgFMsXckFbR","type":"assistant","uuid":"8ee5ed47-fee4-45fd-aacf-a4bc530a860b","timestamp":"2026-03-25T05:04:22.645Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} 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throughput for WAL writers\n96a79098 carry forward: uncommitted session files\nd3b94c33 Completed 'Explore' agent: Find CUDA/HIP macro switching (toolu_01EbN3)\nbf1a8a17 fix: Shard WAL consumer for higher throughput\n50aed595 fix: metricstore NATS contention\n818a05f2 carry forward: uncommitted session files\nb214e175 Add buffered I/O to WAL writes and fix MemoryCap comment\necd29b28 carry forward: uncommitted session files\n21b6c1b5 carry forward: uncommitted session files\na243e174 Update to shutdown worker for WAL checkpointing mode\na418abc7 Run go fix\nca0f9a42 Introduce metric store binary checkpoints with write ahead log","is_error":false}]},"uuid":"f72c9daa-b9f1-4702-ab70-27595a349fdb","timestamp":"2026-03-25T05:04:23.722Z","toolUseResult":{"stdout":"6f7dda53 Cleanup\n0325d9e8 fix: Increase throughput for WAL writers\n96a79098 carry forward: uncommitted session files\nd3b94c33 Completed 'Explore' agent: Find CUDA/HIP macro switching (toolu_01EbN3)\nbf1a8a17 fix: Shard WAL consumer for higher throughput\n50aed595 fix: metricstore NATS contention\n818a05f2 carry forward: uncommitted session files\nb214e175 Add buffered I/O to WAL writes and fix MemoryCap comment\necd29b28 carry forward: uncommitted session files\n21b6c1b5 carry forward: uncommitted session files\na243e174 Update to shutdown worker for WAL checkpointing mode\na418abc7 Run go fix\nca0f9a42 Introduce metric store binary checkpoints with write ahead log","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false},"sourceToolAssistantUUID":"12cc18f5-1681-4509-bf1c-7f2b8b314439","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} 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{"parentUuid":"2e971553-9a1d-4840-b8c8-76a467e4b398","isSidechain":false,"promptId":"32125b75-4928-41fc-805e-168a61de928f","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_016GrecAnaQsaYXppmDB5k6K","type":"tool_result","content":"commit 0325d9e866ec97994e77770ca189838c0ee3b3f0\nAuthor: Jan Eitzinger \nDate: Tue Mar 24 06:53:12 2026 +0100\n\n fix: Increase throughput for WAL writers\n \n Entire-Checkpoint: ddd40d290c56\n\n pkg/metricstore/walCheckpoint.go | 63 ++++++++++++++++++++++++++--------------\n 1 file changed, 42 insertions(+), 21 deletions(-)","is_error":false}]},"uuid":"4afdfaa2-b6a7-4285-8bc2-8c9de53a9df9","timestamp":"2026-03-25T05:04:26.544Z","toolUseResult":{"stdout":"commit 0325d9e866ec97994e77770ca189838c0ee3b3f0\nAuthor: Jan Eitzinger \nDate: Tue Mar 24 06:53:12 2026 +0100\n\n fix: Increase throughput for WAL writers\n \n Entire-Checkpoint: ddd40d290c56\n\n pkg/metricstore/walCheckpoint.go | 63 ++++++++++++++++++++++++++--------------\n 1 file 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{"parentUuid":"5c58411c-3346-4807-968c-f165b588d389","isSidechain":false,"promptId":"32125b75-4928-41fc-805e-168a61de928f","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01L62J1Vo3KHZJJ34D3c5zdK","type":"tool_result","content":"commit 6f7dda53ee1d98481855effeadfd8a2e7d26c7ec\nAuthor: Jan Eitzinger \nDate: Tue Mar 24 07:03:46 2026 +0100\n\n Cleanup\n \n Entire-Checkpoint: ed68d32218ac\n\n pkg/metricstore/walCheckpoint.go | 63 ----------------------------------------\n 1 file changed, 63 deletions(-)","is_error":false}]},"uuid":"e3b61de6-bc34-478e-a2f8-16cdca22f187","timestamp":"2026-03-25T05:04:31.634Z","toolUseResult":{"stdout":"commit 6f7dda53ee1d98481855effeadfd8a2e7d26c7ec\nAuthor: Jan Eitzinger \nDate: Tue Mar 24 07:03:46 2026 +0100\n\n Cleanup\n \n Entire-Checkpoint: ed68d32218ac\n\n pkg/metricstore/walCheckpoint.go | 63 ----------------------------------------\n 1 file changed, 63 deletions(-)","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false},"sourceToolAssistantUUID":"5c58411c-3346-4807-968c-f165b588d389","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"e3b61de6-bc34-478e-a2f8-16cdca22f187","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_011BHqr4SpW2wyJo5yT8H9dv","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01USB4tDAus1ZwRKZoPX914M","name":"Bash","input":{"command":"git diff 6f7dda53^..6f7dda53 -- pkg/metricstore/walCheckpoint.go","description":"Show the Cleanup commit diff"},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":219,"cache_read_input_tokens":37710,"output_tokens":103,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":219,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CZPDR37CgqH9GyezHobuf","type":"assistant","uuid":"7b8f2a7f-8f7e-4fea-b22b-bf5010137fd2","timestamp":"2026-03-25T05:04:34.493Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"7b8f2a7f-8f7e-4fea-b22b-bf5010137fd2","isSidechain":false,"promptId":"32125b75-4928-41fc-805e-168a61de928f","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01USB4tDAus1ZwRKZoPX914M","type":"tool_result","content":"diff --git a/pkg/metricstore/walCheckpoint.go b/pkg/metricstore/walCheckpoint.go\nindex 85e5047e..57064e5f 100644\n--- a/pkg/metricstore/walCheckpoint.go\n+++ b/pkg/metricstore/walCheckpoint.go\n@@ -434,69 +434,6 @@ func writeWALRecordDirect(w *bufio.Writer, msg *WALMessage) error {\n \treturn err\n }\n \n-// buildWALPayload encodes a WALMessage into a binary payload (without magic/length/CRC).\n-func buildWALPayload(msg *WALMessage) []byte {\n-\tsize := 8 + 2 + len(msg.MetricName) + 1 + 4\n-\tfor _, s := range msg.Selector {\n-\t\tsize += 1 + len(s)\n-\t}\n-\n-\tbuf := make([]byte, 0, size)\n-\n-\t// Timestamp (8 bytes, little-endian int64)\n-\tvar ts [8]byte\n-\tbinary.LittleEndian.PutUint64(ts[:], uint64(msg.Timestamp))\n-\tbuf = append(buf, ts[:]...)\n-\n-\t// Metric name (2-byte length prefix + bytes)\n-\tvar mLen [2]byte\n-\tbinary.LittleEndian.PutUint16(mLen[:], uint16(len(msg.MetricName)))\n-\tbuf = append(buf, mLen[:]...)\n-\tbuf = append(buf, msg.MetricName...)\n-\n-\t// Selector count (1 byte)\n-\tbuf = append(buf, byte(len(msg.Selector)))\n-\n-\t// Selectors (1-byte length prefix + bytes each)\n-\tfor _, sel := range msg.Selector {\n-\t\tbuf = append(buf, byte(len(sel)))\n-\t\tbuf = append(buf, sel...)\n-\t}\n-\n-\t// Value (4 bytes, float32 bit representation)\n-\tvar val [4]byte\n-\tbinary.LittleEndian.PutUint32(val[:], math.Float32bits(float32(msg.Value)))\n-\tbuf = append(buf, val[:]...)\n-\n-\treturn buf\n-}\n-\n-// writeWALRecord appends a binary WAL record to the writer.\n-// Format: [4B magic][4B payload_len][payload][4B CRC32]\n-func writeWALRecord(w io.Writer, msg *WALMessage) error {\n-\tpayload := buildWALPayload(msg)\n-\tcrc := crc32.ChecksumIEEE(payload)\n-\n-\trecord := make([]byte, 0, 4+4+len(payload)+4)\n-\n-\tvar magic [4]byte\n-\tbinary.LittleEndian.PutUint32(magic[:], walRecordMagic)\n-\trecord = append(record, magic[:]...)\n-\n-\tvar pLen [4]byte\n-\tbinary.LittleEndian.PutUint32(pLen[:], uint32(len(payload)))\n-\trecord = append(record, pLen[:]...)\n-\n-\trecord = append(record, payload...)\n-\n-\tvar crcBytes [4]byte\n-\tbinary.LittleEndian.PutUint32(crcBytes[:], crc)\n-\trecord = append(record, crcBytes[:]...)\n-\n-\t_, err := w.Write(record)\n-\treturn err\n-}\n-\n // readWALRecord reads one WAL record from the reader.\n // Returns (nil, nil) on clean EOF. Returns error on data corruption.\n // A CRC mismatch indicates a truncated trailing record (expected on crash).","is_error":false}]},"uuid":"5065f01e-a02b-4717-95d4-19d652d16e96","timestamp":"2026-03-25T05:04:34.528Z","toolUseResult":{"stdout":"diff --git a/pkg/metricstore/walCheckpoint.go b/pkg/metricstore/walCheckpoint.go\nindex 85e5047e..57064e5f 100644\n--- a/pkg/metricstore/walCheckpoint.go\n+++ b/pkg/metricstore/walCheckpoint.go\n@@ -434,69 +434,6 @@ func writeWALRecordDirect(w *bufio.Writer, msg *WALMessage) error {\n \treturn err\n }\n \n-// buildWALPayload encodes a WALMessage into a binary payload (without magic/length/CRC).\n-func buildWALPayload(msg *WALMessage) []byte {\n-\tsize := 8 + 2 + len(msg.MetricName) + 1 + 4\n-\tfor _, s := range msg.Selector {\n-\t\tsize += 1 + len(s)\n-\t}\n-\n-\tbuf := make([]byte, 0, size)\n-\n-\t// Timestamp (8 bytes, little-endian int64)\n-\tvar ts [8]byte\n-\tbinary.LittleEndian.PutUint64(ts[:], uint64(msg.Timestamp))\n-\tbuf = append(buf, ts[:]...)\n-\n-\t// Metric name (2-byte length prefix + bytes)\n-\tvar mLen [2]byte\n-\tbinary.LittleEndian.PutUint16(mLen[:], uint16(len(msg.MetricName)))\n-\tbuf = append(buf, mLen[:]...)\n-\tbuf = append(buf, msg.MetricName...)\n-\n-\t// Selector count (1 byte)\n-\tbuf = append(buf, byte(len(msg.Selector)))\n-\n-\t// Selectors (1-byte length prefix + bytes each)\n-\tfor _, sel := range msg.Selector {\n-\t\tbuf = append(buf, byte(len(sel)))\n-\t\tbuf = append(buf, sel...)\n-\t}\n-\n-\t// Value (4 bytes, float32 bit representation)\n-\tvar val [4]byte\n-\tbinary.LittleEndian.PutUint32(val[:], math.Float32bits(float32(msg.Value)))\n-\tbuf = append(buf, val[:]...)\n-\n-\treturn buf\n-}\n-\n-// writeWALRecord appends a binary WAL record to the writer.\n-// Format: [4B magic][4B payload_len][payload][4B CRC32]\n-func writeWALRecord(w io.Writer, msg *WALMessage) error {\n-\tpayload := buildWALPayload(msg)\n-\tcrc := crc32.ChecksumIEEE(payload)\n-\n-\trecord := make([]byte, 0, 4+4+len(payload)+4)\n-\n-\tvar magic [4]byte\n-\tbinary.LittleEndian.PutUint32(magic[:], walRecordMagic)\n-\trecord = append(record, magic[:]...)\n-\n-\tvar pLen [4]byte\n-\tbinary.LittleEndian.PutUint32(pLen[:], uint32(len(payload)))\n-\trecord = append(record, pLen[:]...)\n-\n-\trecord = append(record, payload...)\n-\n-\tvar crcBytes [4]byte\n-\tbinary.LittleEndian.PutUint32(crcBytes[:], crc)\n-\trecord = append(record, crcBytes[:]...)\n-\n-\t_, err := w.Write(record)\n-\treturn err\n-}\n-\n // readWALRecord reads one WAL record from the reader.\n // Returns (nil, nil) on clean EOF. Returns error on data corruption.\n // A CRC mismatch indicates a truncated trailing record (expected on crash).","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false},"sourceToolAssistantUUID":"7b8f2a7f-8f7e-4fea-b22b-bf5010137fd2","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"5065f01e-a02b-4717-95d4-19d652d16e96","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_0143FY83cA8zM8kHgd2uRMLJ","type":"message","role":"assistant","content":[{"type":"text","text":"The recent commits only affected writing, not loading. The loading code hasn't changed. So the regression must be because the checkpoint format is now WAL+binary (`.bin` files) instead of JSON, and `readBinaryLevel` uses `binary.Read` per value which is extremely slow due to reflection.\n\nLet me check what format was being loaded before:"}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":1297,"cache_read_input_tokens":37710,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":1297},"output_tokens":1,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZPDRFN9eLDsuRUUcUieN","type":"assistant","uuid":"fde5d233-c039-4b0c-a64d-473ed0691ffd","timestamp":"2026-03-25T05:04:38.779Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} 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changes"},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":1297,"cache_read_input_tokens":37710,"output_tokens":180,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":1297,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CZPDRFN9eLDsuRUUcUieN","type":"assistant","uuid":"c45ea1d5-56f5-426d-bbf6-5e33afa16eb5","timestamp":"2026-03-25T05:04:39.512Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"c45ea1d5-56f5-426d-bbf6-5e33afa16eb5","isSidechain":false,"promptId":"32125b75-4928-41fc-805e-168a61de928f","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01HFqiaSNktxVLnqtxSnsx6n","type":"tool_result","content":"6f7dda53 Cleanup\n0325d9e8 fix: Increase throughput for WAL writers\n96a79098 carry forward: uncommitted session files\nd3b94c33 Completed 'Explore' agent: Find CUDA/HIP macro switching (toolu_01EbN3)\nbf1a8a17 fix: Shard WAL consumer for higher throughput\n50aed595 fix: metricstore NATS contention\n818a05f2 carry forward: uncommitted session files\n39ab1278 Make checkpointInterval an option config option again.\nb214e175 Add buffered I/O to WAL writes and fix MemoryCap comment\necd29b28 carry forward: uncommitted session files\n21b6c1b5 carry forward: uncommitted session files\n39635ea1 Cleanup metricstore options\na243e174 Update to shutdown worker for WAL checkpointing mode\na418abc7 Run go fix\nca0f9a42 Introduce metric store binary checkpoints with write ahead log\n9fc1836c Replace avro checkpoints with native binary format\n8b7cb587 Modernize code\n41546796 Apply optimizations to checkpoint loading\n3cf88f75 Update to checkpoint loader in CCMS\neb5aa9ad Disable explicit GC calls","is_error":false}]},"uuid":"bac40e6a-5abc-49cd-b0cc-e263dd1509fe","timestamp":"2026-03-25T05:04:39.588Z","toolUseResult":{"stdout":"6f7dda53 Cleanup\n0325d9e8 fix: Increase throughput for WAL writers\n96a79098 carry forward: uncommitted session files\nd3b94c33 Completed 'Explore' agent: Find CUDA/HIP macro switching (toolu_01EbN3)\nbf1a8a17 fix: Shard WAL consumer for higher throughput\n50aed595 fix: metricstore NATS contention\n818a05f2 carry forward: uncommitted session files\n39ab1278 Make checkpointInterval an option config option again.\nb214e175 Add buffered I/O to WAL writes and fix MemoryCap comment\necd29b28 carry forward: uncommitted session files\n21b6c1b5 carry forward: uncommitted session files\n39635ea1 Cleanup metricstore options\na243e174 Update to shutdown worker for WAL checkpointing mode\na418abc7 Run go fix\nca0f9a42 Introduce metric store binary checkpoints with write ahead log\n9fc1836c Replace avro checkpoints with native binary format\n8b7cb587 Modernize code\n41546796 Apply optimizations to checkpoint loading\n3cf88f75 Update to checkpoint loader in CCMS\neb5aa9ad Disable explicit GC calls","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false},"sourceToolAssistantUUID":"c45ea1d5-56f5-426d-bbf6-5e33afa16eb5","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} 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dates"},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":324,"cache_read_input_tokens":39516,"output_tokens":95,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":324,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CZPDRsUYP8t9cJbgkSgod","type":"assistant","uuid":"5ac4cf6e-9259-4016-9e74-64394ca9ebed","timestamp":"2026-03-25T05:04:45.665Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"5ac4cf6e-9259-4016-9e74-64394ca9ebed","isSidechain":false,"promptId":"32125b75-4928-41fc-805e-168a61de928f","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_013zPzApYwGd4equR5qfaBca","type":"tool_result","content":"6f7dda53 2026-03-24 07:03:46 +0100 Cleanup\n0325d9e8 2026-03-24 06:53:12 +0100 fix: Increase throughput for WAL writers\ne41d1251 2026-03-23 06:37:24 +0100 fix: Continue on error\n586c9020 2026-03-23 06:32:24 +0100 Restructure metricstore cleanup archiving to stay withinh 32k parquet-go limit\n96a79098 2026-03-20 08:03:34 +0100 carry forward: uncommitted session files\nc0d2d65f 2026-03-19 21:16:48 +0100 Introduce average resampler support\n09501df3 2026-03-18 17:32:16 +0100 fix: reduce memory usage in parquet checkpoint archiver\nd3b94c33 2026-03-18 15:48:25 +0100 Completed 'Explore' agent: Find CUDA/HIP macro switching (toolu_01EbN3)\n8b132ed7 2026-03-18 06:47:45 +0100 fix: Blocking ReceiveNats call\nbf1a8a17 2026-03-18 06:32:14 +0100 fix: Shard WAL consumer for higher throughput\n50aed595 2026-03-18 06:14:15 +0100 fix: metricstore NATS contention\n818a05f2 2026-03-18 05:31:49 +0100 carry forward: uncommitted session files\nd46e6371 2026-03-18 05:22:39 +0100 Add log about checkpoint archiving\n02f82c2c 2026-03-18 05:08:37 +0100 fix: Prevent memory spikes in parquet writer for metricstore move policy\n0a4c4d8e 2026-03-17 18:41:47 +0100 Patching parquet archive writer for high memory usage\nbab6eb4c 2026-03-16 15:35:24 +0100 Convert Warn message on missing metrics to Debug level\n39ab1278 2026-03-13 09:07:38 +0100 Make checkpointInterval an option config option again.\nb214e175 2026-03-13 09:05:24 +0100 Add buffered I/O to WAL writes and fix MemoryCap comment\n8234ad31 2026-03-13 07:57:35 +0100 fix: Fix metricstore memory explosion from broken emergency free and batch aborts\necd29b28 2026-03-04 17:31:37 +0100 carry forward: uncommitted session files\n845d0111 2026-03-04 17:31:36 +0100 Further consolidate and improve ccms query builder\n26982088 2026-03-04 16:43:05 +0100 Consolidate code for external and internal ccms buildQueries function\n67a17b53 2026-03-04 15:14:35 +0100 Reduce noise in info log\n21b6c1b5 2026-03-04 10:38:10 +0100 carry forward: uncommitted session files\n39635ea1 2026-03-04 10:37:43 +0100 Cleanup metricstore options\n74ab51f4 2026-03-03 09:51:04 +0100 Patch bufferPool with no limits to pool size\n688ad507 2026-03-03 06:58:28 +0100 Merge branch 'optimize-checkpoint-wal' into dev\n718ff602 2026-03-02 14:10:28 +0100 clarify ccms logs\na243e174 2026-03-02 15:27:06 +0100 Update to shutdown worker for WAL checkpointing mode\n1ec41d83 2026-02-28 19:34:33 +0100 Review and improve buffer pool implmentation. Add unit tests.","is_error":false}]},"uuid":"854b06f4-ad3f-4251-8cb2-0f42b5ad5fb7","timestamp":"2026-03-25T05:04:45.775Z","toolUseResult":{"stdout":"6f7dda53 2026-03-24 07:03:46 +0100 Cleanup\n0325d9e8 2026-03-24 06:53:12 +0100 fix: Increase throughput for WAL writers\ne41d1251 2026-03-23 06:37:24 +0100 fix: Continue on error\n586c9020 2026-03-23 06:32:24 +0100 Restructure metricstore cleanup archiving to stay withinh 32k parquet-go limit\n96a79098 2026-03-20 08:03:34 +0100 carry forward: uncommitted session files\nc0d2d65f 2026-03-19 21:16:48 +0100 Introduce average resampler support\n09501df3 2026-03-18 17:32:16 +0100 fix: reduce memory usage in parquet checkpoint archiver\nd3b94c33 2026-03-18 15:48:25 +0100 Completed 'Explore' agent: Find CUDA/HIP macro switching (toolu_01EbN3)\n8b132ed7 2026-03-18 06:47:45 +0100 fix: Blocking ReceiveNats call\nbf1a8a17 2026-03-18 06:32:14 +0100 fix: Shard WAL consumer for higher throughput\n50aed595 2026-03-18 06:14:15 +0100 fix: metricstore NATS contention\n818a05f2 2026-03-18 05:31:49 +0100 carry forward: uncommitted session files\nd46e6371 2026-03-18 05:22:39 +0100 Add log about checkpoint archiving\n02f82c2c 2026-03-18 05:08:37 +0100 fix: Prevent memory spikes in parquet writer for metricstore move policy\n0a4c4d8e 2026-03-17 18:41:47 +0100 Patching parquet archive writer for high memory usage\nbab6eb4c 2026-03-16 15:35:24 +0100 Convert Warn message on missing metrics to Debug level\n39ab1278 2026-03-13 09:07:38 +0100 Make checkpointInterval an option config option again.\nb214e175 2026-03-13 09:05:24 +0100 Add buffered I/O to WAL writes and fix MemoryCap comment\n8234ad31 2026-03-13 07:57:35 +0100 fix: Fix metricstore memory explosion from broken emergency free and batch aborts\necd29b28 2026-03-04 17:31:37 +0100 carry forward: uncommitted session files\n845d0111 2026-03-04 17:31:36 +0100 Further consolidate and improve ccms query builder\n26982088 2026-03-04 16:43:05 +0100 Consolidate code for external and internal ccms buildQueries function\n67a17b53 2026-03-04 15:14:35 +0100 Reduce noise in info log\n21b6c1b5 2026-03-04 10:38:10 +0100 carry forward: uncommitted session files\n39635ea1 2026-03-04 10:37:43 +0100 Cleanup metricstore options\n74ab51f4 2026-03-03 09:51:04 +0100 Patch bufferPool with no limits to pool size\n688ad507 2026-03-03 06:58:28 +0100 Merge branch 'optimize-checkpoint-wal' into dev\n718ff602 2026-03-02 14:10:28 +0100 clarify ccms logs\na243e174 2026-03-02 15:27:06 +0100 Update to shutdown worker for WAL checkpointing mode\n1ec41d83 2026-02-28 19:34:33 +0100 Review and improve buffer pool implmentation. 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Returns error on data corruption.\n 439→// A CRC mismatch indicates a truncated trailing record (expected on crash).\n 440→func readWALRecord(r io.Reader) (*WALMessage, error) {\n 441→\tvar magic uint32\n 442→\tif err := binary.Read(r, binary.LittleEndian, &magic); err != nil {\n 443→\t\tif err == io.EOF {\n 444→\t\t\treturn nil, nil // Clean EOF\n 445→\t\t}\n 446→\t\treturn nil, fmt.Errorf(\"read record magic: %w\", err)\n 447→\t}\n 448→\n 449→\tif magic != walRecordMagic {\n 450→\t\treturn nil, fmt.Errorf(\"invalid record magic 0x%08X (expected 0x%08X)\", magic, walRecordMagic)\n 451→\t}\n 452→\n 453→\tvar payloadLen uint32\n 454→\tif err := binary.Read(r, binary.LittleEndian, &payloadLen); err != nil {\n 455→\t\treturn nil, fmt.Errorf(\"read payload length: %w\", err)\n 456→\t}\n 457→\n 458→\tif payloadLen > 1<<20 { // 1 MB sanity limit\n 459→\t\treturn nil, fmt.Errorf(\"record payload too large: %d bytes\", payloadLen)\n 460→\t}\n 461→\n 462→\tpayload := make([]byte, payloadLen)\n 463→\tif _, err := io.ReadFull(r, payload); err != nil {\n 464→\t\treturn nil, fmt.Errorf(\"read payload: %w\", err)\n 465→\t}\n 466→\n 467→\tvar storedCRC uint32\n 468→\tif err := binary.Read(r, binary.LittleEndian, &storedCRC); err != nil {\n 469→\t\treturn nil, fmt.Errorf(\"read CRC: %w\", err)\n 470→\t}\n 471→\n 472→\tif crc32.ChecksumIEEE(payload) != storedCRC {\n 473→\t\treturn nil, fmt.Errorf(\"CRC mismatch (truncated write or corruption)\")\n 474→\t}\n 475→\n 476→\treturn parseWALPayload(payload)\n 477→}\n 478→\n 479→// parseWALPayload decodes a binary payload into a WALMessage.\n 480→func parseWALPayload(payload []byte) (*WALMessage, error) {\n 481→\tif len(payload) < 8+2+1+4 {\n 482→\t\treturn nil, fmt.Errorf(\"payload too short: %d bytes\", len(payload))\n 483→\t}\n 484→\n 485→\toffset := 0\n 486→\n 487→\t// Timestamp (8 bytes)\n 488→\tts := int64(binary.LittleEndian.Uint64(payload[offset : offset+8]))\n 489→\toffset += 8\n 490→\n 491→\t// Metric name (2-byte length + bytes)\n 492→\tif offset+2 > len(payload) {\n 493→\t\treturn nil, fmt.Errorf(\"metric name length overflows payload\")\n 494→\t}\n 495→\tmLen := int(binary.LittleEndian.Uint16(payload[offset : offset+2]))\n 496→\toffset += 2\n 497→\n 498→\tif offset+mLen > len(payload) {\n 499→\t\treturn nil, fmt.Errorf(\"metric name overflows payload\")\n 500→\t}\n 501→\tmetricName := string(payload[offset : offset+mLen])\n 502→\toffset += mLen\n 503→\n 504→\t// Selector count (1 byte)\n 505→\tif offset >= len(payload) {\n 506→\t\treturn nil, fmt.Errorf(\"selector count overflows payload\")\n 507→\t}\n 508→\tselCount := int(payload[offset])\n 509→\toffset++\n 510→\n 511→\tselectors := make([]string, selCount)\n 512→\tfor i := range selCount {\n 513→\t\tif offset >= len(payload) {\n 514→\t\t\treturn nil, fmt.Errorf(\"selector[%d] length overflows payload\", i)\n 515→\t\t}\n 516→\t\tsLen := int(payload[offset])\n 517→\t\toffset++\n 518→\n 519→\t\tif offset+sLen > len(payload) {\n 520→\t\t\treturn nil, fmt.Errorf(\"selector[%d] data overflows payload\", i)\n 521→\t\t}\n 522→\t\tselectors[i] = string(payload[offset : offset+sLen])\n 523→\t\toffset += sLen\n 524→\t}\n 525→\n 526→\t// Value (4 bytes, float32 bits)\n 527→\tif offset+4 > len(payload) {\n 528→\t\treturn nil, fmt.Errorf(\"value overflows payload\")\n 529→\t}\n 530→\tbits := binary.LittleEndian.Uint32(payload[offset : offset+4])\n 531→\tvalue := schema.Float(math.Float32frombits(bits))\n 532→\n 533→\treturn &WALMessage{\n 534→\t\tMetricName: metricName,\n 535→\t\tTimestamp: ts,\n 536→\t\tSelector: selectors,\n 537→\t\tValue: value,\n 538→\t}, nil\n 539→}\n 540→\n 541→// loadWALFile reads a WAL file and replays all valid records into the Level tree.\n 542→// l is the host-level node. Corrupt or partial trailing records are silently skipped\n 543→// (expected on crash). Records older than 'from' are skipped."}]},"uuid":"59e41fc9-43af-4353-a3dc-eb39cef844c7","timestamp":"2026-03-25T05:05:19.347Z","toolUseResult":{"type":"text","file":{"filePath":"/Users/jan/prg/ClusterCockpit/cc-backend/pkg/metricstore/walCheckpoint.go","content":"\treturn err\n}\n\n// readWALRecord reads one WAL record from the reader.\n// Returns (nil, nil) on clean EOF. Returns error on data corruption.\n// A CRC mismatch indicates a truncated trailing record (expected on crash).\nfunc readWALRecord(r io.Reader) (*WALMessage, error) {\n\tvar magic uint32\n\tif err := binary.Read(r, binary.LittleEndian, &magic); err != nil {\n\t\tif err == io.EOF {\n\t\t\treturn nil, nil // Clean EOF\n\t\t}\n\t\treturn nil, fmt.Errorf(\"read record magic: %w\", err)\n\t}\n\n\tif magic != walRecordMagic {\n\t\treturn nil, fmt.Errorf(\"invalid record magic 0x%08X (expected 0x%08X)\", magic, walRecordMagic)\n\t}\n\n\tvar payloadLen uint32\n\tif err := binary.Read(r, binary.LittleEndian, &payloadLen); err != nil {\n\t\treturn nil, fmt.Errorf(\"read payload length: %w\", err)\n\t}\n\n\tif payloadLen > 1<<20 { // 1 MB sanity limit\n\t\treturn nil, fmt.Errorf(\"record payload too large: %d bytes\", payloadLen)\n\t}\n\n\tpayload := make([]byte, payloadLen)\n\tif _, err := io.ReadFull(r, payload); err != nil {\n\t\treturn nil, fmt.Errorf(\"read payload: %w\", err)\n\t}\n\n\tvar storedCRC uint32\n\tif err := binary.Read(r, binary.LittleEndian, &storedCRC); err != nil {\n\t\treturn nil, fmt.Errorf(\"read CRC: %w\", err)\n\t}\n\n\tif crc32.ChecksumIEEE(payload) != storedCRC {\n\t\treturn nil, fmt.Errorf(\"CRC mismatch (truncated write or corruption)\")\n\t}\n\n\treturn parseWALPayload(payload)\n}\n\n// parseWALPayload decodes a binary payload into a WALMessage.\nfunc parseWALPayload(payload []byte) (*WALMessage, error) {\n\tif len(payload) < 8+2+1+4 {\n\t\treturn nil, fmt.Errorf(\"payload too short: %d bytes\", len(payload))\n\t}\n\n\toffset := 0\n\n\t// Timestamp (8 bytes)\n\tts := int64(binary.LittleEndian.Uint64(payload[offset : offset+8]))\n\toffset += 8\n\n\t// Metric name (2-byte length + bytes)\n\tif offset+2 > len(payload) {\n\t\treturn nil, fmt.Errorf(\"metric name length overflows payload\")\n\t}\n\tmLen := int(binary.LittleEndian.Uint16(payload[offset : offset+2]))\n\toffset += 2\n\n\tif offset+mLen > len(payload) {\n\t\treturn nil, fmt.Errorf(\"metric name overflows payload\")\n\t}\n\tmetricName := string(payload[offset : offset+mLen])\n\toffset += mLen\n\n\t// Selector count (1 byte)\n\tif offset >= len(payload) {\n\t\treturn nil, fmt.Errorf(\"selector count overflows payload\")\n\t}\n\tselCount := int(payload[offset])\n\toffset++\n\n\tselectors := make([]string, selCount)\n\tfor i := range selCount {\n\t\tif offset >= len(payload) {\n\t\t\treturn nil, fmt.Errorf(\"selector[%d] length overflows payload\", i)\n\t\t}\n\t\tsLen := int(payload[offset])\n\t\toffset++\n\n\t\tif offset+sLen > len(payload) {\n\t\t\treturn nil, fmt.Errorf(\"selector[%d] data overflows payload\", i)\n\t\t}\n\t\tselectors[i] = string(payload[offset : offset+sLen])\n\t\toffset += sLen\n\t}\n\n\t// Value (4 bytes, float32 bits)\n\tif offset+4 > len(payload) {\n\t\treturn nil, fmt.Errorf(\"value overflows payload\")\n\t}\n\tbits := binary.LittleEndian.Uint32(payload[offset : offset+4])\n\tvalue := schema.Float(math.Float32frombits(bits))\n\n\treturn &WALMessage{\n\t\tMetricName: metricName,\n\t\tTimestamp: ts,\n\t\tSelector: selectors,\n\t\tValue: value,\n\t}, nil\n}\n\n// loadWALFile reads a WAL file and replays all valid records into the Level tree.\n// l is the host-level node. 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{\npkg/metricstore/metricstore.go:138:\t\tKeys.NumWorkers = min(runtime.NumCPU()/2+1, DefaultMaxWorkers)\npkg/metricstore/metricstore.go:140:\tcclog.Debugf(\"[METRICSTORE]> Using %d workers for checkpoint/archive operations\\n\", Keys.NumWorkers)\npkg/metricstore/metricstore.go:188:\t\t\tif err := ReceiveNats(ms, Keys.NumWorkers, ctx); err != nil {\npkg/metricstore/config.go:13://\t├─ NumWorkers: Parallel checkpoint/archive workers\npkg/metricstore/config.go:114:// - NumWorkers: Parallel workers for checkpoint/archive (0 = auto: min(NumCPU/2+1, 10))\npkg/metricstore/config.go:124:\tNumWorkers int `json:\"num-workers\"`\npkg/metricstore/checkpoint.go:184:// Uses worker pool (Keys.NumWorkers) for parallel processing. Only locks one host\npkg/metricstore/checkpoint.go:222:\twg.Add(Keys.NumWorkers)\npkg/metricstore/checkpoint.go:223:\twork := make(chan workItem, Keys.NumWorkers*2)\npkg/metricstore/checkpoint.go:224:\tfor worker := 0; worker < Keys.NumWorkers; worker++ {\npkg/metricstore/checkpoint.go:397:\twork := make(chan [2]string, Keys.NumWorkers*4)\npkg/metricstore/checkpoint.go:400:\twg.Add(Keys.NumWorkers)\npkg/metricstore/checkpoint.go:401:\tfor worker := 0; worker < Keys.NumWorkers; worker++ {\npkg/metricstore/archive.go:109:\twork := make(chan workItem, Keys.NumWorkers)\npkg/metricstore/archive.go:111:\twg.Add(Keys.NumWorkers)\npkg/metricstore/archive.go:112:\tfor worker := 0; worker < Keys.NumWorkers; worker++ {\npkg/metricstore/archive.go:208:\t\t// Small buffer provides back-pressure: at most NumWorkers+2 results in flight.\npkg/metricstore/archive.go:212:\t\t}, Keys.NumWorkers)\npkg/metricstore/archive.go:217:\t\twg.Add(Keys.NumWorkers)\npkg/metricstore/archive.go:218:\t\tfor w := 0; w < Keys.NumWorkers; w++ {\npkg/metricstore/walCheckpoint.go:159:\twalNumShards = max(Keys.NumWorkers, 1)\npkg/metricstore/walCheckpoint.go:663:\twg.Add(Keys.NumWorkers)\npkg/metricstore/walCheckpoint.go:664:\twork := make(chan workItem, Keys.NumWorkers*2)\npkg/metricstore/walCheckpoint.go:666:\tfor range Keys.NumWorkers {"}]},"uuid":"c621965f-a003-4894-ae65-c77a9d2932ef","timestamp":"2026-03-25T05:05:46.850Z","toolUseResult":{"mode":"content","numFiles":0,"filenames":[],"content":"pkg/metricstore/metricstore.go:136:\t// Set NumWorkers from config or use default\npkg/metricstore/metricstore.go:137:\tif Keys.NumWorkers <= 0 {\npkg/metricstore/metricstore.go:138:\t\tKeys.NumWorkers = min(runtime.NumCPU()/2+1, DefaultMaxWorkers)\npkg/metricstore/metricstore.go:140:\tcclog.Debugf(\"[METRICSTORE]> Using %d workers for checkpoint/archive operations\\n\", Keys.NumWorkers)\npkg/metricstore/metricstore.go:188:\t\t\tif err := ReceiveNats(ms, Keys.NumWorkers, ctx); err != nil {\npkg/metricstore/config.go:13://\t├─ NumWorkers: Parallel checkpoint/archive workers\npkg/metricstore/config.go:114:// - NumWorkers: Parallel workers for checkpoint/archive (0 = auto: min(NumCPU/2+1, 10))\npkg/metricstore/config.go:124:\tNumWorkers int `json:\"num-workers\"`\npkg/metricstore/checkpoint.go:184:// Uses worker pool (Keys.NumWorkers) for parallel processing. Only locks one host\npkg/metricstore/checkpoint.go:222:\twg.Add(Keys.NumWorkers)\npkg/metricstore/checkpoint.go:223:\twork := make(chan workItem, Keys.NumWorkers*2)\npkg/metricstore/checkpoint.go:224:\tfor worker := 0; worker < Keys.NumWorkers; worker++ {\npkg/metricstore/checkpoint.go:397:\twork := make(chan [2]string, Keys.NumWorkers*4)\npkg/metricstore/checkpoint.go:400:\twg.Add(Keys.NumWorkers)\npkg/metricstore/checkpoint.go:401:\tfor worker := 0; worker < Keys.NumWorkers; worker++ {\npkg/metricstore/archive.go:109:\twork := make(chan workItem, Keys.NumWorkers)\npkg/metricstore/archive.go:111:\twg.Add(Keys.NumWorkers)\npkg/metricstore/archive.go:112:\tfor worker := 0; worker < Keys.NumWorkers; worker++ {\npkg/metricstore/archive.go:208:\t\t// Small buffer provides back-pressure: at most NumWorkers+2 results in flight.\npkg/metricstore/archive.go:212:\t\t}, Keys.NumWorkers)\npkg/metricstore/archive.go:217:\t\twg.Add(Keys.NumWorkers)\npkg/metricstore/archive.go:218:\t\tfor w := 0; w < Keys.NumWorkers; w++ {\npkg/metricstore/walCheckpoint.go:159:\twalNumShards = max(Keys.NumWorkers, 1)\npkg/metricstore/walCheckpoint.go:663:\twg.Add(Keys.NumWorkers)\npkg/metricstore/walCheckpoint.go:664:\twork := make(chan workItem, Keys.NumWorkers*2)\npkg/metricstore/walCheckpoint.go:666:\tfor range Keys.NumWorkers {","numLines":26},"sourceToolAssistantUUID":"f8b6847a-b898-4d67-9c90-f626f4872d79","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"c621965f-a003-4894-ae65-c77a9d2932ef","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_011RShN3rZ5hSybkAhQ8JvbJ","type":"message","role":"assistant","content":[{"type":"text","text":"Now let me look at `readBinaryLevel` more carefully — specifically the float reading loop and `readString16`:"}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":2214,"cache_read_input_tokens":43941,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":2214},"output_tokens":1,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZPDWaeQQHVqJMJ2vGYQg","type":"assistant","uuid":"d8173974-44c5-499e-aa3c-8dd43eb5595b","timestamp":"2026-03-25T05:05:50.167Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"d8173974-44c5-499e-aa3c-8dd43eb5595b","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_011RShN3rZ5hSybkAhQ8JvbJ","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01WSRc5SgAn4QoRfVy1g1fHP","name":"Grep","input":{"pattern":"func readString16","path":"/Users/jan/prg/ClusterCockpit/cc-backend/pkg/metricstore/walCheckpoint.go","output_mode":"content","-n":true,"-A":20},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":2214,"cache_read_input_tokens":43941,"output_tokens":181,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":2214,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CZPDWaeQQHVqJMJ2vGYQg","type":"assistant","uuid":"dda9b372-a3b1-4f27-9175-15588c7ec928","timestamp":"2026-03-25T05:05:50.976Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"dda9b372-a3b1-4f27-9175-15588c7ec928","isSidechain":false,"type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:Grep","command":"callback"},"parentToolUseID":"toolu_01WSRc5SgAn4QoRfVy1g1fHP","toolUseID":"toolu_01WSRc5SgAn4QoRfVy1g1fHP","timestamp":"2026-03-25T05:05:50.993Z","uuid":"313575b8-4978-4c7b-bcc9-060ed5652ff3","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"dda9b372-a3b1-4f27-9175-15588c7ec928","isSidechain":false,"promptId":"32125b75-4928-41fc-805e-168a61de928f","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01WSRc5SgAn4QoRfVy1g1fHP","type":"tool_result","content":"913:func readString16(r io.Reader) (string, error) {\n914-\tvar sLen uint16\n915-\tif err := binary.Read(r, binary.LittleEndian, &sLen); err != nil {\n916-\t\treturn \"\", err\n917-\t}\n918-\tbuf := make([]byte, sLen)\n919-\tif _, err := io.ReadFull(r, buf); err != nil {\n920-\t\treturn \"\", err\n921-\t}\n922-\treturn string(buf), nil\n923-}"}]},"uuid":"f7125aa7-233f-48b5-bd88-e694332810c0","timestamp":"2026-03-25T05:05:50.993Z","toolUseResult":{"mode":"content","numFiles":0,"filenames":[],"content":"913:func readString16(r io.Reader) (string, error) {\n914-\tvar sLen uint16\n915-\tif err := binary.Read(r, binary.LittleEndian, &sLen); err != nil {\n916-\t\treturn \"\", err\n917-\t}\n918-\tbuf := make([]byte, sLen)\n919-\tif _, err := io.ReadFull(r, buf); err != nil {\n920-\t\treturn \"\", err\n921-\t}\n922-\treturn string(buf), nil\n923-}","numLines":11},"sourceToolAssistantUUID":"dda9b372-a3b1-4f27-9175-15588c7ec928","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"f7125aa7-233f-48b5-bd88-e694332810c0","isSidechain":false,"promptId":"32125b75-4928-41fc-805e-168a61de928f","type":"user","message":{"role":"user","content":[{"type":"text","text":"[Request interrupted by user]"}]},"uuid":"ec3729a7-aa17-456f-a922-ddadc59fc763","timestamp":"2026-03-25T05:05:51.193Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"type":"file-history-snapshot","messageId":"ce61fe79-a6e2-422f-9e35-63250af2d8e2","snapshot":{"messageId":"ce61fe79-a6e2-422f-9e35-63250af2d8e2","trackedFileBackups":{},"timestamp":"2026-03-25T05:06:32.603Z"},"isSnapshotUpdate":false} {"parentUuid":"ec3729a7-aa17-456f-a922-ddadc59fc763","isSidechain":false,"promptId":"6055f42a-c78d-4b2b-b415-b0d8e1653078","type":"user","message":{"role":"user","content":"It must have been changes of the last 2 days. Before the startup was fast. Maybe the changes in the startup and shutdown handling code?"},"uuid":"ce61fe79-a6e2-422f-9e35-63250af2d8e2","timestamp":"2026-03-25T05:06:31.977Z","permissionMode":"plan","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"ce61fe79-a6e2-422f-9e35-63250af2d8e2","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01GQtHiExTjCm6TE1QqFMtXV","type":"message","role":"assistant","content":[{"type":"text","text":"\n\nGood point. Let me look at the shutdown/startup changes from the last 2 days."}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":3,"cache_creation_input_tokens":40,"cache_read_input_tokens":46477,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":40},"output_tokens":2,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZPDZxD2Ug11pwj5KVSR1","type":"assistant","uuid":"caeb0f71-049e-43c8-aa24-79c9241b5892","timestamp":"2026-03-25T05:06:36.853Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} 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days"},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"usage":{"input_tokens":3,"cache_creation_input_tokens":40,"cache_read_input_tokens":46477,"output_tokens":114,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":40,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CZPDZxD2Ug11pwj5KVSR1","type":"assistant","uuid":"f30e1a3a-3e16-4190-b398-5c45832de9a6","timestamp":"2026-03-25T05:06:37.359Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"f30e1a3a-3e16-4190-b398-5c45832de9a6","isSidechain":false,"promptId":"6055f42a-c78d-4b2b-b415-b0d8e1653078","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01WyfSRCF5mBLpsgcUMyn95K","type":"tool_result","content":"4b6f6941 Checkpoint: a4d012e1edcf\n93a9d732 fix: Improve shutdown time\n889b284f Checkpoint: ed68d32218ac\n6f7dda53 Cleanup\nbc9c47cd Checkpoint: ddd40d290c56\n0325d9e8 fix: Increase throughput for WAL writers\nc13fd68a Merge pull request #534 from ClusterCockpit/hotfix\n3d94b0bf Merge branch 'master' into hotfix\nd5ea2b4c change: query node states explicitly in node view\n7c42fc3a Checkpoint: 29b9d52db89c\n45f329e5 feat: Add command line switch to trigger manual metricstore checkpoint cleanup\n100dd7da Merge pull request #533 from ClusterCockpit/hotfix\n493cee05 Checkpoint: ccda3b2ff4cb\n192c94a7 fix: Prevent interruption of body lineprotocol parsing on locks\n40142966 Checkpoint: 6000eb5a5bb8\ne41d1251 fix: Continue on error\n1abea621 Checkpoint: 1660b8cf2571\n586c9020 Restructure metricstore cleanup archiving to stay withinh 32k parquet-go limit\n38f75ceb Checkpoint: 1660b8cf2571","is_error":false}]},"uuid":"3958f3e7-e6fb-410c-9faf-4857893a6d9e","timestamp":"2026-03-25T05:06:37.417Z","toolUseResult":{"stdout":"4b6f6941 Checkpoint: a4d012e1edcf\n93a9d732 fix: Improve shutdown time\n889b284f Checkpoint: ed68d32218ac\n6f7dda53 Cleanup\nbc9c47cd Checkpoint: ddd40d290c56\n0325d9e8 fix: Increase throughput for WAL writers\nc13fd68a Merge pull request #534 from ClusterCockpit/hotfix\n3d94b0bf Merge branch 'master' into hotfix\nd5ea2b4c change: query node states explicitly in node view\n7c42fc3a Checkpoint: 29b9d52db89c\n45f329e5 feat: Add command line switch to trigger manual metricstore checkpoint cleanup\n100dd7da Merge pull request #533 from ClusterCockpit/hotfix\n493cee05 Checkpoint: ccda3b2ff4cb\n192c94a7 fix: Prevent interruption of body lineprotocol parsing on locks\n40142966 Checkpoint: 6000eb5a5bb8\ne41d1251 fix: Continue on error\n1abea621 Checkpoint: 1660b8cf2571\n586c9020 Restructure metricstore cleanup archiving to stay withinh 32k parquet-go limit\n38f75ceb Checkpoint: 1660b8cf2571","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false},"sourceToolAssistantUUID":"f30e1a3a-3e16-4190-b398-5c45832de9a6","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"3958f3e7-e6fb-410c-9faf-4857893a6d9e","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01KyDkcGgaPpGqBpcSZYSEBX","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01LAUYhJEUbpPd3wxJgegAzF","name":"Bash","input":{"command":"git show 93a9d732 --stat","description":"Check \"Improve shutdown time\" 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93a9d732a48cf3c9dc1969d467c8a4b6ecf99adb\nAuthor: Jan Eitzinger \nDate: Tue Mar 24 07:17:34 2026 +0100\n\n fix: Improve shutdown time\n \n Entire-Checkpoint: a4d012e1edcf\n\n cmd/cc-backend/server.go | 48 +++++++++++++++++++++++++++---------------------\n 1 file changed, 27 insertions(+), 21 deletions(-)","is_error":false}]},"uuid":"a8bf08f7-a8be-45ec-8fa1-c11d422a7b34","timestamp":"2026-03-25T05:06:44.929Z","toolUseResult":{"stdout":"commit 93a9d732a48cf3c9dc1969d467c8a4b6ecf99adb\nAuthor: Jan Eitzinger \nDate: Tue Mar 24 07:17:34 2026 +0100\n\n fix: Improve shutdown time\n \n Entire-Checkpoint: a4d012e1edcf\n\n cmd/cc-backend/server.go | 48 +++++++++++++++++++++++++++---------------------\n 1 file changed, 27 insertions(+), 21 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{"parentUuid":"2571ec49-4e43-43dd-8593-e33e244b5723","isSidechain":false,"promptId":"6055f42a-c78d-4b2b-b415-b0d8e1653078","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01UybCsZn2FGUijcQk1HXwGB","type":"tool_result","content":"commit 45f329e5fbdf0643246f3413b9831523bde7d2c3\nAuthor: Jan Eitzinger \nDate: Mon Mar 23 07:58:35 2026 +0100\n\n feat: Add command line switch to trigger manual metricstore checkpoint cleanup\n \n Entire-Checkpoint: 29b9d52db89c\n\n cmd/cc-backend/cli.go | 4 +++-\n cmd/cc-backend/main.go | 38 ++++++++++++++++++++++++++++++++++++++\n 2 files changed, 41 insertions(+), 1 deletion(-)","is_error":false}]},"uuid":"1bcc6ff1-5ed8-4b59-8df2-6bb3c5c2a093","timestamp":"2026-03-25T05:06:45.050Z","toolUseResult":{"stdout":"commit 45f329e5fbdf0643246f3413b9831523bde7d2c3\nAuthor: Jan Eitzinger \nDate: Mon Mar 23 07:58:35 2026 +0100\n\n feat: Add command line switch to trigger manual metricstore checkpoint cleanup\n \n Entire-Checkpoint: 29b9d52db89c\n\n cmd/cc-backend/cli.go | 4 +++-\n cmd/cc-backend/main.go | 38 ++++++++++++++++++++++++++++++++++++++\n 2 files changed, 41 insertions(+), 1 deletion(-)","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false},"sourceToolAssistantUUID":"2571ec49-4e43-43dd-8593-e33e244b5723","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"1bcc6ff1-5ed8-4b59-8df2-6bb3c5c2a093","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01D1GSPSEkYPms8f4rLppKcu","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01Fzjz5DE6qgxggLbSTzGoLu","name":"Bash","input":{"command":"git diff 93a9d732^..93a9d732 -- cmd/cc-backend/server.go","description":"Show the shutdown time improvement 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{"parentUuid":"c85faf41-b38c-43ba-80e8-d4e0302f36b2","isSidechain":false,"promptId":"6055f42a-c78d-4b2b-b415-b0d8e1653078","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01Fzjz5DE6qgxggLbSTzGoLu","type":"tool_result","content":"diff --git a/cmd/cc-backend/server.go b/cmd/cc-backend/server.go\nindex 4e6120e9..b37d3450 100644\n--- a/cmd/cc-backend/server.go\n+++ b/cmd/cc-backend/server.go\n@@ -18,6 +18,7 @@ import (\n \t\"net/http\"\n \t\"os\"\n \t\"strings\"\n+\t\"sync\"\n \t\"time\"\n \n \t\"github.com/99designs/gqlgen/graphql\"\n@@ -399,16 +400,6 @@ func (s *Server) Start(ctx context.Context) error {\n \t\treturn fmt.Errorf(\"dropping privileges: %w\", err)\n \t}\n \n-\t// Handle context cancellation for graceful shutdown\n-\tgo func() {\n-\t\t<-ctx.Done()\n-\t\tshutdownCtx, cancel := context.WithTimeout(context.Background(), 30*time.Second)\n-\t\tdefer cancel()\n-\t\tif err := s.server.Shutdown(shutdownCtx); err != nil {\n-\t\t\tcclog.Errorf(\"Server shutdown error: %v\", err)\n-\t\t}\n-\t}()\n-\n \tif err = s.server.Serve(listener); err != nil && err != http.ErrServerClosed {\n \t\treturn fmt.Errorf(\"server failed: %w\", err)\n \t}\n@@ -416,8 +407,7 @@ func (s *Server) Start(ctx context.Context) error {\n }\n \n func (s *Server) Shutdown(ctx context.Context) {\n-\t// Create a shutdown context with timeout\n-\tshutdownCtx, cancel := context.WithTimeout(ctx, 30*time.Second)\n+\tshutdownCtx, cancel := context.WithTimeout(ctx, 5*time.Second)\n \tdefer cancel()\n \n \tnc := nats.GetClient()\n@@ -425,20 +415,36 @@ func (s *Server) Shutdown(ctx context.Context) {\n \t\tnc.Close()\n \t}\n \n-\t// First shut down the server gracefully (waiting for all ongoing requests)\n \tif err := s.server.Shutdown(shutdownCtx); err != nil {\n \t\tcclog.Errorf(\"Server shutdown error: %v\", err)\n \t}\n \n-\t// Archive all the metric store data\n-\tms := metricstore.GetMemoryStore()\n+\t// Run metricstore and archiver shutdown concurrently.\n+\t// They are independent: metricstore writes .bin snapshots,\n+\t// archiver flushes pending job archives.\n+\tdone := make(chan struct{})\n+\tgo func() {\n+\t\tdefer close(done)\n+\t\tvar wg sync.WaitGroup\n \n-\tif ms != nil {\n-\t\tmetricstore.Shutdown()\n-\t}\n+\t\tif ms := metricstore.GetMemoryStore(); ms != nil {\n+\t\t\twg.Go(func() {\n+\t\t\t\tmetricstore.Shutdown()\n+\t\t\t})\n+\t\t}\n+\n+\t\twg.Go(func() {\n+\t\t\tif err := archiver.Shutdown(10 * time.Second); err != nil {\n+\t\t\t\tcclog.Warnf(\"Archiver shutdown: %v\", err)\n+\t\t\t}\n+\t\t})\n+\n+\t\twg.Wait()\n+\t}()\n \n-\t// Shutdown archiver with 10 second timeout for fast shutdown\n-\tif err := archiver.Shutdown(10 * time.Second); err != nil {\n-\t\tcclog.Warnf(\"Archiver shutdown: %v\", err)\n+\tselect {\n+\tcase <-done:\n+\tcase <-time.After(10 * time.Second):\n+\t\tcclog.Warn(\"Shutdown deadline exceeded, forcing exit\")\n \t}\n }","is_error":false}]},"uuid":"460b2ef0-acf9-49c7-a26c-e8ba2c13b9bf","timestamp":"2026-03-25T05:06:49.925Z","toolUseResult":{"stdout":"diff --git a/cmd/cc-backend/server.go b/cmd/cc-backend/server.go\nindex 4e6120e9..b37d3450 100644\n--- a/cmd/cc-backend/server.go\n+++ b/cmd/cc-backend/server.go\n@@ -18,6 +18,7 @@ import (\n \t\"net/http\"\n \t\"os\"\n \t\"strings\"\n+\t\"sync\"\n \t\"time\"\n \n \t\"github.com/99designs/gqlgen/graphql\"\n@@ -399,16 +400,6 @@ func (s *Server) Start(ctx context.Context) error {\n \t\treturn fmt.Errorf(\"dropping privileges: %w\", err)\n \t}\n \n-\t// Handle context cancellation for graceful shutdown\n-\tgo func() {\n-\t\t<-ctx.Done()\n-\t\tshutdownCtx, cancel := context.WithTimeout(context.Background(), 30*time.Second)\n-\t\tdefer cancel()\n-\t\tif err := s.server.Shutdown(shutdownCtx); err != nil {\n-\t\t\tcclog.Errorf(\"Server shutdown error: %v\", err)\n-\t\t}\n-\t}()\n-\n \tif err = s.server.Serve(listener); err != nil && err != http.ErrServerClosed {\n \t\treturn fmt.Errorf(\"server failed: %w\", err)\n \t}\n@@ -416,8 +407,7 @@ func (s *Server) Start(ctx context.Context) error {\n }\n \n func (s *Server) Shutdown(ctx context.Context) {\n-\t// Create a shutdown context with timeout\n-\tshutdownCtx, cancel := context.WithTimeout(ctx, 30*time.Second)\n+\tshutdownCtx, cancel := context.WithTimeout(ctx, 5*time.Second)\n \tdefer cancel()\n \n \tnc := nats.GetClient()\n@@ -425,20 +415,36 @@ func (s *Server) Shutdown(ctx context.Context) {\n \t\tnc.Close()\n \t}\n \n-\t// First shut down the server gracefully (waiting for all ongoing requests)\n \tif err := s.server.Shutdown(shutdownCtx); err != nil {\n \t\tcclog.Errorf(\"Server shutdown error: %v\", err)\n \t}\n \n-\t// Archive all the metric store data\n-\tms := metricstore.GetMemoryStore()\n+\t// Run metricstore and archiver shutdown concurrently.\n+\t// They are independent: metricstore writes .bin snapshots,\n+\t// archiver flushes pending job archives.\n+\tdone := make(chan struct{})\n+\tgo func() {\n+\t\tdefer close(done)\n+\t\tvar wg sync.WaitGroup\n \n-\tif ms != nil {\n-\t\tmetricstore.Shutdown()\n-\t}\n+\t\tif ms := metricstore.GetMemoryStore(); ms != nil {\n+\t\t\twg.Go(func() {\n+\t\t\t\tmetricstore.Shutdown()\n+\t\t\t})\n+\t\t}\n+\n+\t\twg.Go(func() {\n+\t\t\tif err := archiver.Shutdown(10 * time.Second); err != nil {\n+\t\t\t\tcclog.Warnf(\"Archiver shutdown: %v\", err)\n+\t\t\t}\n+\t\t})\n+\n+\t\twg.Wait()\n+\t}()\n \n-\t// Shutdown archiver with 10 second timeout for fast shutdown\n-\tif err := archiver.Shutdown(10 * time.Second); err != nil {\n-\t\tcclog.Warnf(\"Archiver shutdown: %v\", err)\n+\tselect {\n+\tcase <-done:\n+\tcase <-time.After(10 * time.Second):\n+\t\tcclog.Warn(\"Shutdown deadline exceeded, forcing exit\")\n \t}\n }","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false},"sourceToolAssistantUUID":"c85faf41-b38c-43ba-80e8-d4e0302f36b2","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"460b2ef0-acf9-49c7-a26c-e8ba2c13b9bf","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01B3WmHv8fckrmoydFt7wpvG","type":"message","role":"assistant","content":[{"type":"thinking","thinking":"","signature":"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"}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":1080,"cache_read_input_tokens":47712,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":1080},"output_tokens":8,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZPDbEP8wUgYSk5dGthSP","type":"assistant","uuid":"f6ea87b5-5950-45fe-ad33-b63bf7cad5ac","timestamp":"2026-03-25T05:06:57.333Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"f6ea87b5-5950-45fe-ad33-b63bf7cad5ac","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01B3WmHv8fckrmoydFt7wpvG","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01M2onEM7U7ThZsV52Yitgpg","name":"Bash","input":{"command":"git diff 45f329e5^..45f329e5 -- cmd/cc-backend/main.go cmd/cc-backend/cli.go","description":"Show manual checkpoint cleanup commit diff"},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":1080,"cache_read_input_tokens":47712,"output_tokens":256,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":1080,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CZPDbEP8wUgYSk5dGthSP","type":"assistant","uuid":"7c6d80df-4173-4b12-8f59-36a9ff2bfa00","timestamp":"2026-03-25T05:06:57.909Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"7c6d80df-4173-4b12-8f59-36a9ff2bfa00","isSidechain":false,"promptId":"6055f42a-c78d-4b2b-b415-b0d8e1653078","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01M2onEM7U7ThZsV52Yitgpg","type":"tool_result","content":"diff --git a/cmd/cc-backend/cli.go b/cmd/cc-backend/cli.go\nindex 47f534be..3896383a 100644\n--- a/cmd/cc-backend/cli.go\n+++ b/cmd/cc-backend/cli.go\n@@ -11,7 +11,8 @@ import \"flag\"\n \n var (\n \tflagReinitDB, flagInit, flagServer, flagSyncLDAP, flagGops, flagMigrateDB, flagRevertDB,\n-\tflagForceDB, flagDev, flagVersion, flagLogDateTime, flagApplyTags, flagOptimizeDB bool\n+\tflagForceDB, flagDev, flagVersion, flagLogDateTime, flagApplyTags, flagOptimizeDB,\n+\tflagCleanupCheckpoints bool\n \tflagNewUser, flagDelUser, flagGenJWT, flagConfigFile, flagImportJob, flagLogLevel string\n )\n \n@@ -28,6 +29,7 @@ func cliInit() {\n \tflag.BoolVar(&flagApplyTags, \"apply-tags\", false, \"Run taggers on all completed jobs and exit\")\n \tflag.BoolVar(&flagForceDB, \"force-db\", false, \"Force database version, clear dirty flag and exit\")\n \tflag.BoolVar(&flagOptimizeDB, \"optimize-db\", false, \"Optimize database: run VACUUM to reclaim space, then ANALYZE to update query planner statistics\")\n+\tflag.BoolVar(&flagCleanupCheckpoints, \"cleanup-checkpoints\", false, \"Clean up old checkpoint files (delete or archive) based on retention settings, then exit\")\n \tflag.BoolVar(&flagLogDateTime, \"logdate\", false, \"Set this flag to add date and time to log messages\")\n \tflag.StringVar(&flagConfigFile, \"config\", \"./config.json\", \"Specify alternative path to `config.json`\")\n \tflag.StringVar(&flagNewUser, \"add-user\", \"\", \"Add a new user. Argument format: :[admin,support,manager,api,user]:\")\ndiff --git a/cmd/cc-backend/main.go b/cmd/cc-backend/main.go\nindex 12faeae5..f8f0a767 100644\n--- a/cmd/cc-backend/main.go\n+++ b/cmd/cc-backend/main.go\n@@ -14,6 +14,7 @@ import (\n \t\"fmt\"\n \t\"os\"\n \t\"os/signal\"\n+\tgoruntime \"runtime\"\n \t\"runtime/debug\"\n \t\"strings\"\n \t\"sync\"\n@@ -536,6 +537,43 @@ func run() error {\n \t\treturn err\n \t}\n \n+\t// Handle checkpoint cleanup\n+\tif flagCleanupCheckpoints {\n+\t\tmscfg := ccconf.GetPackageConfig(\"metric-store\")\n+\t\tif mscfg == nil {\n+\t\t\treturn fmt.Errorf(\"metric-store configuration required for checkpoint cleanup\")\n+\t\t}\n+\t\tif err := json.Unmarshal(mscfg, &metricstore.Keys); err != nil {\n+\t\t\treturn fmt.Errorf(\"decoding metric-store config: %w\", err)\n+\t\t}\n+\t\tif metricstore.Keys.NumWorkers <= 0 {\n+\t\t\tmetricstore.Keys.NumWorkers = min(goruntime.NumCPU()/2+1, metricstore.DefaultMaxWorkers)\n+\t\t}\n+\n+\t\td, err := time.ParseDuration(metricstore.Keys.RetentionInMemory)\n+\t\tif err != nil {\n+\t\t\treturn fmt.Errorf(\"parsing retention-in-memory: %w\", err)\n+\t\t}\n+\t\tfrom := time.Now().Add(-d)\n+\t\tdeleteMode := metricstore.Keys.Cleanup == nil || metricstore.Keys.Cleanup.Mode != \"archive\"\n+\t\tcleanupDir := \"\"\n+\t\tif !deleteMode {\n+\t\t\tcleanupDir = metricstore.Keys.Cleanup.RootDir\n+\t\t}\n+\n+\t\tcclog.Infof(\"Cleaning up checkpoints older than %s...\", from.Format(time.RFC3339))\n+\t\tn, err := metricstore.CleanupCheckpoints(\n+\t\t\tmetricstore.Keys.Checkpoints.RootDir, cleanupDir, from.Unix(), deleteMode)\n+\t\tif err != nil {\n+\t\t\treturn fmt.Errorf(\"checkpoint cleanup: %w\", err)\n+\t\t}\n+\t\tif deleteMode {\n+\t\t\tcclog.Exitf(\"Cleanup done: %d checkpoint files deleted.\", n)\n+\t\t} else {\n+\t\t\tcclog.Exitf(\"Cleanup done: %d checkpoint files archived to parquet.\", n)\n+\t\t}\n+\t}\n+\n \t// Exit if start server is not requested\n \tif !flagServer {\n \t\tcclog.Exit(\"No errors, server flag not set. Exiting cc-backend.\")","is_error":false}]},"uuid":"80c27b20-8ba2-43fe-bded-f3b4f8415eec","timestamp":"2026-03-25T05:06:57.970Z","toolUseResult":{"stdout":"diff --git a/cmd/cc-backend/cli.go b/cmd/cc-backend/cli.go\nindex 47f534be..3896383a 100644\n--- a/cmd/cc-backend/cli.go\n+++ b/cmd/cc-backend/cli.go\n@@ -11,7 +11,8 @@ import \"flag\"\n \n var (\n \tflagReinitDB, flagInit, flagServer, flagSyncLDAP, flagGops, flagMigrateDB, flagRevertDB,\n-\tflagForceDB, flagDev, flagVersion, flagLogDateTime, flagApplyTags, flagOptimizeDB bool\n+\tflagForceDB, flagDev, flagVersion, flagLogDateTime, flagApplyTags, flagOptimizeDB,\n+\tflagCleanupCheckpoints bool\n \tflagNewUser, flagDelUser, flagGenJWT, flagConfigFile, flagImportJob, flagLogLevel string\n )\n \n@@ -28,6 +29,7 @@ func cliInit() {\n \tflag.BoolVar(&flagApplyTags, \"apply-tags\", false, \"Run taggers on all completed jobs and exit\")\n \tflag.BoolVar(&flagForceDB, \"force-db\", false, \"Force database version, clear dirty flag and exit\")\n \tflag.BoolVar(&flagOptimizeDB, \"optimize-db\", false, \"Optimize database: run VACUUM to reclaim space, then ANALYZE to update query planner statistics\")\n+\tflag.BoolVar(&flagCleanupCheckpoints, \"cleanup-checkpoints\", false, \"Clean up old checkpoint files (delete or archive) based on retention settings, then exit\")\n \tflag.BoolVar(&flagLogDateTime, \"logdate\", false, \"Set this flag to add date and time to log messages\")\n \tflag.StringVar(&flagConfigFile, \"config\", \"./config.json\", \"Specify alternative path to `config.json`\")\n \tflag.StringVar(&flagNewUser, \"add-user\", \"\", \"Add a new user. Argument format: :[admin,support,manager,api,user]:\")\ndiff --git a/cmd/cc-backend/main.go b/cmd/cc-backend/main.go\nindex 12faeae5..f8f0a767 100644\n--- a/cmd/cc-backend/main.go\n+++ b/cmd/cc-backend/main.go\n@@ -14,6 +14,7 @@ import (\n \t\"fmt\"\n \t\"os\"\n \t\"os/signal\"\n+\tgoruntime \"runtime\"\n \t\"runtime/debug\"\n \t\"strings\"\n \t\"sync\"\n@@ -536,6 +537,43 @@ func run() error {\n \t\treturn err\n \t}\n \n+\t// Handle checkpoint cleanup\n+\tif flagCleanupCheckpoints {\n+\t\tmscfg := ccconf.GetPackageConfig(\"metric-store\")\n+\t\tif mscfg == nil {\n+\t\t\treturn fmt.Errorf(\"metric-store configuration required for checkpoint cleanup\")\n+\t\t}\n+\t\tif err := json.Unmarshal(mscfg, &metricstore.Keys); err != nil {\n+\t\t\treturn fmt.Errorf(\"decoding metric-store config: %w\", err)\n+\t\t}\n+\t\tif metricstore.Keys.NumWorkers <= 0 {\n+\t\t\tmetricstore.Keys.NumWorkers = min(goruntime.NumCPU()/2+1, metricstore.DefaultMaxWorkers)\n+\t\t}\n+\n+\t\td, err := time.ParseDuration(metricstore.Keys.RetentionInMemory)\n+\t\tif err != nil {\n+\t\t\treturn fmt.Errorf(\"parsing retention-in-memory: %w\", err)\n+\t\t}\n+\t\tfrom := time.Now().Add(-d)\n+\t\tdeleteMode := metricstore.Keys.Cleanup == nil || metricstore.Keys.Cleanup.Mode != \"archive\"\n+\t\tcleanupDir := \"\"\n+\t\tif !deleteMode {\n+\t\t\tcleanupDir = metricstore.Keys.Cleanup.RootDir\n+\t\t}\n+\n+\t\tcclog.Infof(\"Cleaning up checkpoints older than %s...\", from.Format(time.RFC3339))\n+\t\tn, err := metricstore.CleanupCheckpoints(\n+\t\t\tmetricstore.Keys.Checkpoints.RootDir, cleanupDir, from.Unix(), deleteMode)\n+\t\tif err != nil {\n+\t\t\treturn fmt.Errorf(\"checkpoint cleanup: %w\", err)\n+\t\t}\n+\t\tif deleteMode {\n+\t\t\tcclog.Exitf(\"Cleanup done: %d checkpoint files deleted.\", n)\n+\t\t} else {\n+\t\t\tcclog.Exitf(\"Cleanup done: %d checkpoint files archived to parquet.\", n)\n+\t\t}\n+\t}\n+\n \t// Exit if start server is not requested\n \tif !flagServer {\n \t\tcclog.Exit(\"No errors, server flag not set. Exiting cc-backend.\")","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false},"sourceToolAssistantUUID":"7c6d80df-4173-4b12-8f59-36a9ff2bfa00","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"80c27b20-8ba2-43fe-bded-f3b4f8415eec","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01HcwZvYLxqjAWzQBbM98Ccv","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01ByLYQ3iFQkGbGWhGvYPSAk","name":"Bash","input":{"command":"git diff 192c94a7^..192c94a7","description":"Show the lineprotocol parsing fix"},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":1508,"cache_read_input_tokens":48792,"output_tokens":90,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":1508,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CZPDbpmrVN4QeK11aVoSJ","type":"assistant","uuid":"8dd4426e-1555-4a31-8bb0-75e71350d9a1","timestamp":"2026-03-25T05:07:03.466Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"8dd4426e-1555-4a31-8bb0-75e71350d9a1","isSidechain":false,"promptId":"6055f42a-c78d-4b2b-b415-b0d8e1653078","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01ByLYQ3iFQkGbGWhGvYPSAk","type":"tool_result","content":"diff --git a/cmd/cc-backend/server.go b/cmd/cc-backend/server.go\nindex bdbb8a7e..4e6120e9 100644\n--- a/cmd/cc-backend/server.go\n+++ b/cmd/cc-backend/server.go\n@@ -344,18 +344,18 @@ func (s *Server) init() error {\n \n // Server timeout defaults (in seconds)\n const (\n-\tdefaultReadTimeout = 20\n-\tdefaultWriteTimeout = 20\n+\tdefaultReadHeaderTimeout = 20\n+\tdefaultWriteTimeout = 20\n )\n \n func (s *Server) Start(ctx context.Context) error {\n \t// Use configurable timeouts with defaults\n-\treadTimeout := time.Duration(defaultReadTimeout) * time.Second\n+\treadHeaderTimeout := time.Duration(defaultReadHeaderTimeout) * time.Second\n \twriteTimeout := time.Duration(defaultWriteTimeout) * time.Second\n \n \ts.server = &http.Server{\n-\t\tReadTimeout: readTimeout,\n-\t\tWriteTimeout: writeTimeout,\n+\t\tReadHeaderTimeout: readHeaderTimeout,\n+\t\tWriteTimeout: writeTimeout,\n \t\tHandler: s.router,\n \t\tAddr: config.Keys.Addr,\n \t}","is_error":false}]},"uuid":"123f3625-5045-4a22-9339-517d61c05514","timestamp":"2026-03-25T05:07:03.541Z","toolUseResult":{"stdout":"diff --git a/cmd/cc-backend/server.go b/cmd/cc-backend/server.go\nindex bdbb8a7e..4e6120e9 100644\n--- a/cmd/cc-backend/server.go\n+++ b/cmd/cc-backend/server.go\n@@ -344,18 +344,18 @@ func (s *Server) init() error {\n \n // Server timeout defaults (in seconds)\n const (\n-\tdefaultReadTimeout = 20\n-\tdefaultWriteTimeout = 20\n+\tdefaultReadHeaderTimeout = 20\n+\tdefaultWriteTimeout = 20\n )\n \n func (s *Server) Start(ctx context.Context) error {\n \t// Use configurable timeouts with defaults\n-\treadTimeout := time.Duration(defaultReadTimeout) * time.Second\n+\treadHeaderTimeout := time.Duration(defaultReadHeaderTimeout) * time.Second\n \twriteTimeout := time.Duration(defaultWriteTimeout) * time.Second\n \n \ts.server = &http.Server{\n-\t\tReadTimeout: readTimeout,\n-\t\tWriteTimeout: writeTimeout,\n+\t\tReadHeaderTimeout: readHeaderTimeout,\n+\t\tWriteTimeout: writeTimeout,\n \t\tHandler: s.router,\n \t\tAddr: config.Keys.Addr,\n \t}","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false},"sourceToolAssistantUUID":"8dd4426e-1555-4a31-8bb0-75e71350d9a1","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} 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ccconf.GetPackageConfig(\"metric-store\")\n 543→\t\tif mscfg == nil {\n 544→\t\t\treturn fmt.Errorf(\"metric-store configuration required for checkpoint cleanup\")\n 545→\t\t}\n 546→\t\tif err := json.Unmarshal(mscfg, &metricstore.Keys); err != nil {\n 547→\t\t\treturn fmt.Errorf(\"decoding metric-store config: %w\", err)\n 548→\t\t}\n 549→\t\tif metricstore.Keys.NumWorkers <= 0 {\n 550→\t\t\tmetricstore.Keys.NumWorkers = min(goruntime.NumCPU()/2+1, metricstore.DefaultMaxWorkers)\n 551→\t\t}\n 552→\n 553→\t\td, err := time.ParseDuration(metricstore.Keys.RetentionInMemory)\n 554→\t\tif err != nil {\n 555→\t\t\treturn fmt.Errorf(\"parsing retention-in-memory: %w\", err)\n 556→\t\t}\n 557→\t\tfrom := time.Now().Add(-d)\n 558→\t\tdeleteMode := metricstore.Keys.Cleanup == nil || metricstore.Keys.Cleanup.Mode != \"archive\"\n 559→\t\tcleanupDir := \"\"\n 560→\t\tif !deleteMode {\n 561→\t\t\tcleanupDir = metricstore.Keys.Cleanup.RootDir\n 562→\t\t}\n 563→\n 564→\t\tcclog.Infof(\"Cleaning up checkpoints older than %s...\", from.Format(time.RFC3339))\n 565→\t\tn, err := metricstore.CleanupCheckpoints(\n 566→\t\t\tmetricstore.Keys.Checkpoints.RootDir, cleanupDir, from.Unix(), deleteMode)\n 567→\t\tif err != nil {\n 568→\t\t\treturn fmt.Errorf(\"checkpoint cleanup: %w\", err)\n 569→\t\t}\n 570→\t\tif deleteMode {\n 571→\t\t\tcclog.Exitf(\"Cleanup done: %d checkpoint files deleted.\", n)\n 572→\t\t} else {\n 573→\t\t\tcclog.Exitf(\"Cleanup done: %d checkpoint files archived to parquet.\", n)\n 574→\t\t}\n 575→\t}\n 576→\n 577→\t// Exit if start server is not requested\n 578→\tif !flagServer {\n 579→\t\tcclog.Exit(\"No errors, server flag not set. Exiting cc-backend.\")\n 580→\t}\n 581→\n 582→\t// Run server with context\n 583→\tctx, cancel := context.WithCancel(context.Background())\n 584→\tdefer cancel()\n 585→\n 586→\treturn runServer(ctx)\n 587→}\n 588→\n 589→func main() {\n 590→\tif err := run(); err != nil {\n 591→\t\tcclog.Error(err.Error())\n 592→\t\tos.Exit(1)\n 593→\t}\n 594→}\n 595→"}]},"uuid":"e94cf1e4-02c0-4a8f-a911-d858d8088dcc","timestamp":"2026-03-25T05:07:09.701Z","toolUseResult":{"type":"text","file":{"filePath":"/Users/jan/prg/ClusterCockpit/cc-backend/cmd/cc-backend/main.go","content":"\t\treturn err\n\t}\n\n\t// Handle checkpoint cleanup\n\tif flagCleanupCheckpoints {\n\t\tmscfg := ccconf.GetPackageConfig(\"metric-store\")\n\t\tif mscfg == nil {\n\t\t\treturn fmt.Errorf(\"metric-store configuration required for checkpoint cleanup\")\n\t\t}\n\t\tif err := json.Unmarshal(mscfg, &metricstore.Keys); err != nil {\n\t\t\treturn fmt.Errorf(\"decoding metric-store config: %w\", err)\n\t\t}\n\t\tif metricstore.Keys.NumWorkers <= 0 {\n\t\t\tmetricstore.Keys.NumWorkers = min(goruntime.NumCPU()/2+1, metricstore.DefaultMaxWorkers)\n\t\t}\n\n\t\td, err := time.ParseDuration(metricstore.Keys.RetentionInMemory)\n\t\tif err != nil {\n\t\t\treturn fmt.Errorf(\"parsing retention-in-memory: %w\", err)\n\t\t}\n\t\tfrom := time.Now().Add(-d)\n\t\tdeleteMode := metricstore.Keys.Cleanup == nil || metricstore.Keys.Cleanup.Mode != \"archive\"\n\t\tcleanupDir := \"\"\n\t\tif !deleteMode {\n\t\t\tcleanupDir = metricstore.Keys.Cleanup.RootDir\n\t\t}\n\n\t\tcclog.Infof(\"Cleaning up checkpoints older than %s...\", from.Format(time.RFC3339))\n\t\tn, err := metricstore.CleanupCheckpoints(\n\t\t\tmetricstore.Keys.Checkpoints.RootDir, cleanupDir, from.Unix(), deleteMode)\n\t\tif err != nil {\n\t\t\treturn fmt.Errorf(\"checkpoint cleanup: %w\", err)\n\t\t}\n\t\tif deleteMode {\n\t\t\tcclog.Exitf(\"Cleanup done: %d checkpoint files deleted.\", n)\n\t\t} else {\n\t\t\tcclog.Exitf(\"Cleanup done: %d checkpoint files archived to parquet.\", n)\n\t\t}\n\t}\n\n\t// Exit if start server is not requested\n\tif !flagServer {\n\t\tcclog.Exit(\"No errors, server flag not set. Exiting cc-backend.\")\n\t}\n\n\t// Run server with context\n\tctx, cancel := context.WithCancel(context.Background())\n\tdefer cancel()\n\n\treturn runServer(ctx)\n}\n\nfunc main() {\n\tif err := run(); err != nil {\n\t\tcclog.Error(err.Error())\n\t\tos.Exit(1)\n\t}\n}\n","numLines":59,"startLine":537,"totalLines":595}},"sourceToolAssistantUUID":"b1e51bc7-8b23-4bc4-9c12-bc82e186da0a","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"e94cf1e4-02c0-4a8f-a911-d858d8088dcc","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01YKnMUxNfWXBpHvnrFefkxY","type":"message","role":"assistant","content":[{"type":"text","text":"Let me look at the `runServer` and the metricstore `Init` call path:"}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":1331,"cache_read_input_tokens":50300,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":1331},"output_tokens":1,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZPDcgs8AWDCA6MvD9L1T","type":"assistant","uuid":"a7b88291-9526-4cbf-8c4b-3d3a167191ed","timestamp":"2026-03-25T05:07:14.422Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"a7b88291-9526-4cbf-8c4b-3d3a167191ed","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01YKnMUxNfWXBpHvnrFefkxY","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01AenfSgkLjmgAapVA6QXfSF","name":"Grep","input":{"pattern":"func 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{"parentUuid":"2699e605-5d85-4a7e-bfe0-9a53b376906d","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01KbBzUD5ckyLUY9rnPPNYm3","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01K6h19QEeu5d2Q92fo28R1i","name":"Read","input":{"file_path":"/Users/jan/prg/ClusterCockpit/cc-backend/cmd/cc-backend/main.go","offset":339,"limit":100},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":279,"cache_read_input_tokens":51631,"output_tokens":113,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":279,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CZPDd79NoziUqHgm5LqHQ","type":"assistant","uuid":"43b43df0-56b4-42cb-a2dc-8016818d3e1b","timestamp":"2026-03-25T05:07:20.483Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} 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provided\n 343→\thaveMetricstore := false\n 344→\tmscfg := ccconf.GetPackageConfig(\"metric-store\")\n 345→\tif mscfg != nil {\n 346→\t\tmetrics := metricstore.BuildMetricList()\n 347→\t\tmetricstore.Init(mscfg, metrics, &wg)\n 348→\n 349→\t\t// Inject repository as NodeProvider to break import cycle\n 350→\t\tms := metricstore.GetMemoryStore()\n 351→\t\tjobRepo := repository.GetJobRepository()\n 352→\t\tms.SetNodeProvider(jobRepo)\n 353→\t\tmetricstore.MetricStoreHandle = &metricstore.InternalMetricStore{}\n 354→\t\thaveMetricstore = true\n 355→\t} else {\n 356→\t\tmetricstore.MetricStoreHandle = nil\n 357→\t\tcclog.Debug(\"missing internal metricstore configuration\")\n 358→\t}\n 359→\n 360→\t// Initialize external metric stores if configuration is provided\n 361→\tmscfg = ccconf.GetPackageConfig(\"metric-store-external\")\n 362→\tif mscfg != nil {\n 363→\t\terr := metricdispatch.Init(mscfg)\n 364→\n 365→\t\tif err != nil {\n 366→\t\t\tcclog.Debugf(\"error while initializing external metricdispatch: %v\", err)\n 367→\t\t} else {\n 368→\t\t\thaveMetricstore = true\n 369→\t\t}\n 370→\t}\n 371→\n 372→\tif !haveMetricstore {\n 373→\t\treturn fmt.Errorf(\"missing metricstore configuration\")\n 374→\t}\n 375→\n 376→\t// Start archiver and task manager\n 377→\tarchiver.Start(repository.GetJobRepository(), ctx)\n 378→\ttaskmanager.Start(ccconf.GetPackageConfig(\"cron\"), ccconf.GetPackageConfig(\"archive\"))\n 379→\n 380→\t// Initialize web UI\n 381→\tcfg := ccconf.GetPackageConfig(\"ui\")\n 382→\tif err := web.Init(cfg); err != nil {\n 383→\t\treturn fmt.Errorf(\"initializing web UI: %w\", err)\n 384→\t}\n 385→\n 386→\t// Initialize HTTP server\n 387→\tsrv, err := NewServer(version, commit, date)\n 388→\tif err != nil {\n 389→\t\treturn fmt.Errorf(\"creating server: %w\", err)\n 390→\t}\n 391→\n 392→\t// Channel to collect errors from server\n 393→\terrChan := make(chan error, 1)\n 394→\n 395→\t// Start HTTP server\n 396→\twg.Go(func() {\n 397→\t\tif err := srv.Start(ctx); err != nil {\n 398→\t\t\terrChan <- err\n 399→\t\t}\n 400→\t})\n 401→\n 402→\t// Handle shutdown signals\n 403→\twg.Add(1)\n 404→\tsigs := make(chan os.Signal, 1)\n 405→\tsignal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)\n 406→\tgo func() {\n 407→\t\tdefer wg.Done()\n 408→\t\tselect {\n 409→\t\tcase <-sigs:\n 410→\t\t\tcclog.Info(\"Shutdown signal received\")\n 411→\t\tcase <-ctx.Done():\n 412→\t\t}\n 413→\n 414→\t\truntime.SystemdNotify(false, \"Shutting down ...\")\n 415→\t\tsrv.Shutdown(ctx)\n 416→\t\tutil.FsWatcherShutdown()\n 417→\t\ttaskmanager.Shutdown()\n 418→\t}()\n 419→\n 420→\t// Set GC percent if not configured\n 421→\tif os.Getenv(envGOGC) == \"\" {\n 422→\t\t// trigger GC when heap grows 15% above the previous live set\n 423→\t\tdebug.SetGCPercent(15)\n 424→\t}\n 425→\truntime.SystemdNotify(true, \"running\")\n 426→\n 427→\twaitDone := make(chan struct{})\n 428→\tgo func() {\n 429→\t\twg.Wait()\n 430→\t\tclose(waitDone)\n 431→\t}()\n 432→\n 433→\tgo func() {\n 434→\t\t<-waitDone\n 435→\t\tclose(errChan)\n 436→\t}()\n 437→\n 438→\t// Wait for either:"}]},"uuid":"2636e9f6-26eb-44de-8bec-e32257f5c311","timestamp":"2026-03-25T05:07:20.511Z","toolUseResult":{"type":"text","file":{"filePath":"/Users/jan/prg/ClusterCockpit/cc-backend/cmd/cc-backend/main.go","content":"func runServer(ctx context.Context) error {\n\tvar wg sync.WaitGroup\n\n\t// Initialize metric store if configuration is provided\n\thaveMetricstore := false\n\tmscfg := ccconf.GetPackageConfig(\"metric-store\")\n\tif mscfg != nil {\n\t\tmetrics := metricstore.BuildMetricList()\n\t\tmetricstore.Init(mscfg, metrics, &wg)\n\n\t\t// Inject repository as NodeProvider to break import cycle\n\t\tms := metricstore.GetMemoryStore()\n\t\tjobRepo := repository.GetJobRepository()\n\t\tms.SetNodeProvider(jobRepo)\n\t\tmetricstore.MetricStoreHandle = &metricstore.InternalMetricStore{}\n\t\thaveMetricstore = true\n\t} else {\n\t\tmetricstore.MetricStoreHandle = nil\n\t\tcclog.Debug(\"missing internal metricstore configuration\")\n\t}\n\n\t// Initialize external metric stores if configuration is provided\n\tmscfg = ccconf.GetPackageConfig(\"metric-store-external\")\n\tif mscfg != nil {\n\t\terr := metricdispatch.Init(mscfg)\n\n\t\tif err != nil {\n\t\t\tcclog.Debugf(\"error while initializing external metricdispatch: %v\", err)\n\t\t} else {\n\t\t\thaveMetricstore = true\n\t\t}\n\t}\n\n\tif !haveMetricstore {\n\t\treturn fmt.Errorf(\"missing metricstore configuration\")\n\t}\n\n\t// Start archiver and task manager\n\tarchiver.Start(repository.GetJobRepository(), ctx)\n\ttaskmanager.Start(ccconf.GetPackageConfig(\"cron\"), ccconf.GetPackageConfig(\"archive\"))\n\n\t// Initialize web UI\n\tcfg := ccconf.GetPackageConfig(\"ui\")\n\tif err := web.Init(cfg); err != nil {\n\t\treturn fmt.Errorf(\"initializing web UI: %w\", err)\n\t}\n\n\t// Initialize HTTP server\n\tsrv, err := NewServer(version, commit, date)\n\tif err != nil {\n\t\treturn fmt.Errorf(\"creating server: %w\", err)\n\t}\n\n\t// Channel to collect errors from server\n\terrChan := make(chan error, 1)\n\n\t// Start HTTP server\n\twg.Go(func() {\n\t\tif err := srv.Start(ctx); err != nil {\n\t\t\terrChan <- err\n\t\t}\n\t})\n\n\t// Handle shutdown signals\n\twg.Add(1)\n\tsigs := make(chan os.Signal, 1)\n\tsignal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)\n\tgo func() {\n\t\tdefer wg.Done()\n\t\tselect {\n\t\tcase <-sigs:\n\t\t\tcclog.Info(\"Shutdown signal received\")\n\t\tcase <-ctx.Done():\n\t\t}\n\n\t\truntime.SystemdNotify(false, \"Shutting down ...\")\n\t\tsrv.Shutdown(ctx)\n\t\tutil.FsWatcherShutdown()\n\t\ttaskmanager.Shutdown()\n\t}()\n\n\t// Set GC percent if not configured\n\tif os.Getenv(envGOGC) == \"\" {\n\t\t// trigger GC when heap grows 15% above the previous live set\n\t\tdebug.SetGCPercent(15)\n\t}\n\truntime.SystemdNotify(true, \"running\")\n\n\twaitDone := make(chan struct{})\n\tgo func() {\n\t\twg.Wait()\n\t\tclose(waitDone)\n\t}()\n\n\tgo func() {\n\t\t<-waitDone\n\t\tclose(errChan)\n\t}()\n\n\t// Wait for either:","numLines":100,"startLine":339,"totalLines":595}},"sourceToolAssistantUUID":"43b43df0-56b4-42cb-a2dc-8016818d3e1b","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"2636e9f6-26eb-44de-8bec-e32257f5c311","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_016d52oTXiZeKoPudfCCvYuJ","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01F5TyUVB3VkVHqKeorUQeTy","name":"Read","input":{"file_path":"/Users/jan/prg/ClusterCockpit/cc-backend/cmd/cc-backend/main.go","offset":438,"limit":20},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":1320,"cache_read_input_tokens":51910,"output_tokens":113,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":1320,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CZPDdV7y3QBiVVeChn5nU","type":"assistant","uuid":"885de512-c090-4565-9b3a-25a5963244e4","timestamp":"2026-03-25T05:07:24.744Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"885de512-c090-4565-9b3a-25a5963244e4","isSidechain":false,"type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:Read","command":"callback"},"parentToolUseID":"toolu_01F5TyUVB3VkVHqKeorUQeTy","toolUseID":"toolu_01F5TyUVB3VkVHqKeorUQeTy","timestamp":"2026-03-25T05:07:24.774Z","uuid":"30c9c1fc-6f74-4d0b-899d-70c6ea72e6bf","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"885de512-c090-4565-9b3a-25a5963244e4","isSidechain":false,"promptId":"6055f42a-c78d-4b2b-b415-b0d8e1653078","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01F5TyUVB3VkVHqKeorUQeTy","type":"tool_result","content":" 438→\t// Wait for either:\n 439→\t// 1. An error from server startup\n 440→\t// 2. Completion of all goroutines (normal shutdown or crash)\n 441→\tselect {\n 442→\tcase err := <-errChan:\n 443→\t\t// errChan will be closed when waitDone is closed, which happens\n 444→\t\t// when all goroutines complete (either from normal shutdown or error)\n 445→\t\tif err != nil {\n 446→\t\t\treturn err\n 447→\t\t}\n 448→\tcase <-time.After(100 * time.Millisecond):\n 449→\t\t// Give the server 100ms to start and report any immediate startup errors\n 450→\t\t// After that, just wait for normal shutdown completion\n 451→\t\tselect {\n 452→\t\tcase err := <-errChan:\n 453→\t\t\tif err != nil {\n 454→\t\t\t\treturn err\n 455→\t\t\t}\n 456→\t\tcase <-waitDone:\n 457→\t\t\t// Normal shutdown completed"}]},"uuid":"a0dc4a20-dd64-4568-801e-58980f96650a","timestamp":"2026-03-25T05:07:24.766Z","toolUseResult":{"type":"text","file":{"filePath":"/Users/jan/prg/ClusterCockpit/cc-backend/cmd/cc-backend/main.go","content":"\t// Wait for either:\n\t// 1. An error from server startup\n\t// 2. Completion of all goroutines (normal shutdown or crash)\n\tselect {\n\tcase err := <-errChan:\n\t\t// errChan will be closed when waitDone is closed, which happens\n\t\t// when all goroutines complete (either from normal shutdown or error)\n\t\tif err != nil {\n\t\t\treturn err\n\t\t}\n\tcase <-time.After(100 * time.Millisecond):\n\t\t// Give the server 100ms to start and report any immediate startup errors\n\t\t// After that, just wait for normal shutdown completion\n\t\tselect {\n\t\tcase err := <-errChan:\n\t\t\tif err != nil {\n\t\t\t\treturn err\n\t\t\t}\n\t\tcase <-waitDone:\n\t\t\t// Normal shutdown completed","numLines":20,"startLine":438,"totalLines":595}},"sourceToolAssistantUUID":"885de512-c090-4565-9b3a-25a5963244e4","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"a0dc4a20-dd64-4568-801e-58980f96650a","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_016wA5AfjZrmyS5PZ7bKxiNp","type":"message","role":"assistant","content":[{"type":"text","text":"Now let me look at the `metricstore.Shutdown()` and how the server's `Shutdown` interacts with the WaitGroup:"}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":486,"cache_read_input_tokens":53230,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":486},"output_tokens":2,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZPDdoFsjbzyWU6dmB2v6","type":"assistant","uuid":"ed4d1a33-a47f-491c-b009-1a75b6a6b07f","timestamp":"2026-03-25T05:07:29.787Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"ed4d1a33-a47f-491c-b009-1a75b6a6b07f","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_016wA5AfjZrmyS5PZ7bKxiNp","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01DWVEmETpdDuxwWJyrj6gG9","name":"Grep","input":{"pattern":"func Shutdown","path":"/Users/jan/prg/ClusterCockpit/cc-backend/pkg/metricstore","output_mode":"content","-n":true},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":486,"cache_read_input_tokens":53230,"output_tokens":163,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":486,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CZPDdoFsjbzyWU6dmB2v6","type":"assistant","uuid":"e0fd786e-a193-4138-9a16-dc31ecef856f","timestamp":"2026-03-25T05:07:30.608Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"e0fd786e-a193-4138-9a16-dc31ecef856f","isSidechain":false,"type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:Grep","command":"callback"},"parentToolUseID":"toolu_01DWVEmETpdDuxwWJyrj6gG9","toolUseID":"toolu_01DWVEmETpdDuxwWJyrj6gG9","timestamp":"2026-03-25T05:07:30.644Z","uuid":"efaf4bdf-6685-46ba-8727-7574f7580985","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"e0fd786e-a193-4138-9a16-dc31ecef856f","isSidechain":false,"promptId":"6055f42a-c78d-4b2b-b415-b0d8e1653078","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01DWVEmETpdDuxwWJyrj6gG9","type":"tool_result","content":"pkg/metricstore/metricstore.go:273:func Shutdown() {"}]},"uuid":"607b1026-ed37-457a-bb59-a55c4c3f3ecf","timestamp":"2026-03-25T05:07:30.644Z","toolUseResult":{"mode":"content","numFiles":0,"filenames":[],"content":"pkg/metricstore/metricstore.go:273:func Shutdown() {","numLines":1},"sourceToolAssistantUUID":"e0fd786e-a193-4138-9a16-dc31ecef856f","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"607b1026-ed37-457a-bb59-a55c4c3f3ecf","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01Nc73kxq8mBafFzF3VAbihP","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_014AgNqqu3aap6juswrAaeTz","name":"Read","input":{"file_path":"/Users/jan/prg/ClusterCockpit/cc-backend/pkg/metricstore/metricstore.go","offset":170,"limit":130},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":194,"cache_read_input_tokens":53716,"output_tokens":115,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":194,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CZPDeEPUVWXdhgjUguUki","type":"assistant","uuid":"0baa6553-9e9b-4f5c-bcdc-62d4e22c2153","timestamp":"2026-03-25T05:07:34.832Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"0baa6553-9e9b-4f5c-bcdc-62d4e22c2153","isSidechain":false,"type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:Read","command":"callback"},"parentToolUseID":"toolu_014AgNqqu3aap6juswrAaeTz","toolUseID":"toolu_014AgNqqu3aap6juswrAaeTz","timestamp":"2026-03-25T05:07:34.851Z","uuid":"c38713a6-6f9f-45e2-8f4a-01da2c7cc7c5","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"0baa6553-9e9b-4f5c-bcdc-62d4e22c2153","isSidechain":false,"promptId":"6055f42a-c78d-4b2b-b415-b0d8e1653078","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_014AgNqqu3aap6juswrAaeTz","type":"tool_result","content":" 170→\tctx, shutdown := context.WithCancel(context.Background())\n 171→\n 172→\tRetention(wg, ctx)\n 173→\tCheckpointing(wg, ctx)\n 174→\tCleanUp(wg, ctx)\n 175→\tWALStaging(wg, ctx)\n 176→\tMemoryUsageTracker(wg, ctx)\n 177→\n 178→\t// Note: Signal handling has been removed from this function.\n 179→\t// The caller is responsible for handling shutdown signals and calling\n 180→\t// the shutdown() function when appropriate.\n 181→\t// Store the shutdown function for later use by Shutdown()\n 182→\tshutdownFuncMu.Lock()\n 183→\tshutdownFunc = shutdown\n 184→\tshutdownFuncMu.Unlock()\n 185→\n 186→\tif Keys.Subscriptions != nil {\n 187→\t\twg.Go(func() {\n 188→\t\t\tif err := ReceiveNats(ms, Keys.NumWorkers, ctx); err != nil {\n 189→\t\t\t\tcclog.Fatal(err)\n 190→\t\t\t}\n 191→\t\t})\n 192→\t}\n 193→}\n 194→\n 195→// InitMetrics initializes the singleton MemoryStore instance with the given metric configurations.\n 196→//\n 197→// This function must be called before GetMemoryStore() and can only be called once due to\n 198→// the singleton pattern. It assigns each metric an internal offset for efficient buffer indexing.\n 199→//\n 200→// Parameters:\n 201→// - metrics: Map of metric names to their configurations (frequency and aggregation strategy)\n 202→//\n 203→// Panics if any metric has Frequency == 0, which indicates an invalid configuration.\n 204→//\n 205→// After this call, the global msInstance is ready for use via GetMemoryStore().\n 206→func InitMetrics(metrics map[string]MetricConfig) {\n 207→\tsingleton.Do(func() {\n 208→\t\toffset := 0\n 209→\t\tfor key, cfg := range metrics {\n 210→\t\t\tif cfg.Frequency == 0 {\n 211→\t\t\t\tpanic(\"[METRICSTORE]> invalid frequency\")\n 212→\t\t\t}\n 213→\n 214→\t\t\tmetrics[key] = MetricConfig{\n 215→\t\t\t\tFrequency: cfg.Frequency,\n 216→\t\t\t\tAggregation: cfg.Aggregation,\n 217→\t\t\t\toffset: offset,\n 218→\t\t\t}\n 219→\t\t\toffset += 1\n 220→\t\t}\n 221→\n 222→\t\tmsInstance = &MemoryStore{\n 223→\t\t\troot: Level{\n 224→\t\t\t\tmetrics: make([]*buffer, len(metrics)),\n 225→\t\t\t\tchildren: make(map[string]*Level),\n 226→\t\t\t},\n 227→\t\t\tMetrics: metrics,\n 228→\t\t}\n 229→\t})\n 230→}\n 231→\n 232→// GetMemoryStore returns the singleton MemoryStore instance.\n 233→//\n 234→// Returns the initialized MemoryStore singleton. Calls cclog.Fatal if InitMetrics() was not called first.\n 235→//\n 236→// This function is safe for concurrent use after initialization.\n 237→func GetMemoryStore() *MemoryStore {\n 238→\tif msInstance == nil {\n 239→\t\tcclog.Warnf(\"[METRICSTORE]> MemoryStore not initialized!\")\n 240→\t}\n 241→\n 242→\treturn msInstance\n 243→}\n 244→\n 245→func (ms *MemoryStore) GetMetricFrequency(metricName string) (int64, error) {\n 246→\tif metric, ok := ms.Metrics[metricName]; ok {\n 247→\t\treturn metric.Frequency, nil\n 248→\t}\n 249→\treturn 0, fmt.Errorf(\"[METRICSTORE]> metric %s not found\", metricName)\n 250→}\n 251→\n 252→// SetNodeProvider sets the NodeProvider implementation for the MemoryStore.\n 253→// This must be called during initialization to provide job state information\n 254→// for selective buffer retention during Free operations.\n 255→// If not set, the Free function will fall back to freeing all buffers.\n 256→func (ms *MemoryStore) SetNodeProvider(provider NodeProvider) {\n 257→\tms.nodeProvider = provider\n 258→}\n 259→\n 260→// Shutdown performs a graceful shutdown of the metric store.\n 261→//\n 262→// This function cancels all background goroutines started by Init() and writes\n 263→// a final checkpoint to disk before returning. It should be called when the\n 264→// application receives a termination signal.\n 265→//\n 266→// The function will:\n 267→// 1. Cancel the context to stop all background workers\n 268→// 2. Close the WAL messages channel if using WAL format\n 269→// 3. Write a final checkpoint to preserve in-memory data\n 270→// 4. Log any errors encountered during shutdown\n 271→//\n 272→// Note: This function blocks until the final checkpoint is written.\n 273→func Shutdown() {\n 274→\tshutdownFuncMu.Lock()\n 275→\tdefer shutdownFuncMu.Unlock()\n 276→\tif shutdownFunc != nil {\n 277→\t\tshutdownFunc()\n 278→\t}\n 279→\n 280→\tif Keys.Checkpoints.FileFormat == \"wal\" {\n 281→\t\tfor _, ch := range walShardChs {\n 282→\t\t\tclose(ch)\n 283→\t\t}\n 284→\t}\n 285→\n 286→\tcclog.Infof(\"[METRICSTORE]> Writing to '%s'...\\n\", Keys.Checkpoints.RootDir)\n 287→\tvar files int\n 288→\tvar err error\n 289→\n 290→\tms := GetMemoryStore()\n 291→\n 292→\tlastCheckpointMu.Lock()\n 293→\tfrom := lastCheckpoint\n 294→\tlastCheckpointMu.Unlock()\n 295→\n 296→\tif Keys.Checkpoints.FileFormat == \"wal\" {\n 297→\t\tvar hostDirs []string\n 298→\t\tfiles, hostDirs, err = ms.ToCheckpointWAL(Keys.Checkpoints.RootDir, from.Unix(), time.Now().Unix())\n 299→\t\tif err == nil {"}]},"uuid":"f6b20fa0-736e-48bb-88d5-6f7e11306d5c","timestamp":"2026-03-25T05:07:34.850Z","toolUseResult":{"type":"text","file":{"filePath":"/Users/jan/prg/ClusterCockpit/cc-backend/pkg/metricstore/metricstore.go","content":"\tctx, shutdown := context.WithCancel(context.Background())\n\n\tRetention(wg, ctx)\n\tCheckpointing(wg, ctx)\n\tCleanUp(wg, ctx)\n\tWALStaging(wg, ctx)\n\tMemoryUsageTracker(wg, ctx)\n\n\t// Note: Signal handling has been removed from this function.\n\t// The caller is responsible for handling shutdown signals and calling\n\t// the shutdown() function when appropriate.\n\t// Store the shutdown function for later use by Shutdown()\n\tshutdownFuncMu.Lock()\n\tshutdownFunc = shutdown\n\tshutdownFuncMu.Unlock()\n\n\tif Keys.Subscriptions != nil {\n\t\twg.Go(func() {\n\t\t\tif err := ReceiveNats(ms, Keys.NumWorkers, ctx); err != nil {\n\t\t\t\tcclog.Fatal(err)\n\t\t\t}\n\t\t})\n\t}\n}\n\n// InitMetrics initializes the singleton MemoryStore instance with the given metric configurations.\n//\n// This function must be called before GetMemoryStore() and can only be called once due to\n// the singleton pattern. It assigns each metric an internal offset for efficient buffer indexing.\n//\n// Parameters:\n// - metrics: Map of metric names to their configurations (frequency and aggregation strategy)\n//\n// Panics if any metric has Frequency == 0, which indicates an invalid configuration.\n//\n// After this call, the global msInstance is ready for use via GetMemoryStore().\nfunc InitMetrics(metrics map[string]MetricConfig) {\n\tsingleton.Do(func() {\n\t\toffset := 0\n\t\tfor key, cfg := range metrics {\n\t\t\tif cfg.Frequency == 0 {\n\t\t\t\tpanic(\"[METRICSTORE]> invalid frequency\")\n\t\t\t}\n\n\t\t\tmetrics[key] = MetricConfig{\n\t\t\t\tFrequency: cfg.Frequency,\n\t\t\t\tAggregation: cfg.Aggregation,\n\t\t\t\toffset: offset,\n\t\t\t}\n\t\t\toffset += 1\n\t\t}\n\n\t\tmsInstance = &MemoryStore{\n\t\t\troot: Level{\n\t\t\t\tmetrics: make([]*buffer, len(metrics)),\n\t\t\t\tchildren: make(map[string]*Level),\n\t\t\t},\n\t\t\tMetrics: metrics,\n\t\t}\n\t})\n}\n\n// GetMemoryStore returns the singleton MemoryStore instance.\n//\n// Returns the initialized MemoryStore singleton. Calls cclog.Fatal if InitMetrics() was not called first.\n//\n// This function is safe for concurrent use after initialization.\nfunc GetMemoryStore() *MemoryStore {\n\tif msInstance == nil {\n\t\tcclog.Warnf(\"[METRICSTORE]> MemoryStore not initialized!\")\n\t}\n\n\treturn msInstance\n}\n\nfunc (ms *MemoryStore) GetMetricFrequency(metricName string) (int64, error) {\n\tif metric, ok := ms.Metrics[metricName]; ok {\n\t\treturn metric.Frequency, nil\n\t}\n\treturn 0, fmt.Errorf(\"[METRICSTORE]> metric %s not found\", metricName)\n}\n\n// SetNodeProvider sets the NodeProvider implementation for the MemoryStore.\n// This must be called during initialization to provide job state information\n// for selective buffer retention during Free operations.\n// If not set, the Free function will fall back to freeing all buffers.\nfunc (ms *MemoryStore) SetNodeProvider(provider NodeProvider) {\n\tms.nodeProvider = provider\n}\n\n// Shutdown performs a graceful shutdown of the metric store.\n//\n// This function cancels all background goroutines started by Init() and writes\n// a final checkpoint to disk before returning. It should be called when the\n// application receives a termination signal.\n//\n// The function will:\n// 1. Cancel the context to stop all background workers\n// 2. Close the WAL messages channel if using WAL format\n// 3. Write a final checkpoint to preserve in-memory data\n// 4. Log any errors encountered during shutdown\n//\n// Note: This function blocks until the final checkpoint is written.\nfunc Shutdown() {\n\tshutdownFuncMu.Lock()\n\tdefer shutdownFuncMu.Unlock()\n\tif shutdownFunc != nil {\n\t\tshutdownFunc()\n\t}\n\n\tif Keys.Checkpoints.FileFormat == \"wal\" {\n\t\tfor _, ch := range walShardChs {\n\t\t\tclose(ch)\n\t\t}\n\t}\n\n\tcclog.Infof(\"[METRICSTORE]> Writing to '%s'...\\n\", Keys.Checkpoints.RootDir)\n\tvar files int\n\tvar err error\n\n\tms := GetMemoryStore()\n\n\tlastCheckpointMu.Lock()\n\tfrom := lastCheckpoint\n\tlastCheckpointMu.Unlock()\n\n\tif Keys.Checkpoints.FileFormat == \"wal\" {\n\t\tvar hostDirs []string\n\t\tfiles, hostDirs, err = ms.ToCheckpointWAL(Keys.Checkpoints.RootDir, from.Unix(), time.Now().Unix())\n\t\tif err == nil 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"}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":2815,"cache_read_input_tokens":53910,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":2815},"output_tokens":8,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZPDeYTALtyG4eaQkk95d","type":"assistant","uuid":"57727b0d-0b6b-4665-882c-a45d5be07f0c","timestamp":"2026-03-25T05:08:10.612Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"57727b0d-0b6b-4665-882c-a45d5be07f0c","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01BxXjFhvyC1vckWmX8F1RTK","type":"message","role":"assistant","content":[{"type":"text","text":"Let me check what the server shutdown looked like BEFORE the \"Improve shutdown time\" commit:"}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":2815,"cache_read_input_tokens":53910,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":2815},"output_tokens":8,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZPDeYTALtyG4eaQkk95d","type":"assistant","uuid":"b643e49b-171b-47d1-a570-7c349198532e","timestamp":"2026-03-25T05:08:10.796Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"b643e49b-171b-47d1-a570-7c349198532e","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01BxXjFhvyC1vckWmX8F1RTK","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01W7zoMiCWXEAjGQFveDq16p","name":"Bash","input":{"command":"git show 93a9d732^:cmd/cc-backend/server.go | tail -n +400","description":"Server shutdown code before the change"},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":2815,"cache_read_input_tokens":53910,"output_tokens":1854,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":2815,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CZPDeYTALtyG4eaQkk95d","type":"assistant","uuid":"0959ff73-124b-441a-ad83-6d7e972addba","timestamp":"2026-03-25T05:08:12.365Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"0959ff73-124b-441a-ad83-6d7e972addba","isSidechain":false,"promptId":"6055f42a-c78d-4b2b-b415-b0d8e1653078","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01W7zoMiCWXEAjGQFveDq16p","type":"tool_result","content":"\t}\n\n\t// Handle context cancellation for graceful shutdown\n\tgo func() {\n\t\t<-ctx.Done()\n\t\tshutdownCtx, cancel := context.WithTimeout(context.Background(), 30*time.Second)\n\t\tdefer cancel()\n\t\tif err := s.server.Shutdown(shutdownCtx); err != nil {\n\t\t\tcclog.Errorf(\"Server shutdown error: %v\", err)\n\t\t}\n\t}()\n\n\tif err = s.server.Serve(listener); err != nil && err != http.ErrServerClosed {\n\t\treturn fmt.Errorf(\"server failed: %w\", err)\n\t}\n\treturn nil\n}\n\nfunc (s *Server) Shutdown(ctx context.Context) {\n\t// Create a shutdown context with timeout\n\tshutdownCtx, cancel := context.WithTimeout(ctx, 30*time.Second)\n\tdefer cancel()\n\n\tnc := nats.GetClient()\n\tif nc != nil {\n\t\tnc.Close()\n\t}\n\n\t// First shut down the server gracefully (waiting for all ongoing requests)\n\tif err := s.server.Shutdown(shutdownCtx); err != nil {\n\t\tcclog.Errorf(\"Server shutdown error: %v\", err)\n\t}\n\n\t// Archive all the metric store data\n\tms := metricstore.GetMemoryStore()\n\n\tif ms != nil {\n\t\tmetricstore.Shutdown()\n\t}\n\n\t// Shutdown archiver with 10 second timeout for fast shutdown\n\tif err := archiver.Shutdown(10 * time.Second); err != nil {\n\t\tcclog.Warnf(\"Archiver shutdown: %v\", err)\n\t}\n}","is_error":false}]},"uuid":"02b5a16e-21c8-481a-bb9f-b5441d43b6e1","timestamp":"2026-03-25T05:08:12.425Z","toolUseResult":{"stdout":"\t}\n\n\t// Handle context cancellation for graceful shutdown\n\tgo func() {\n\t\t<-ctx.Done()\n\t\tshutdownCtx, cancel := context.WithTimeout(context.Background(), 30*time.Second)\n\t\tdefer cancel()\n\t\tif err := s.server.Shutdown(shutdownCtx); err != nil {\n\t\t\tcclog.Errorf(\"Server shutdown error: %v\", err)\n\t\t}\n\t}()\n\n\tif err = s.server.Serve(listener); err != nil && err != http.ErrServerClosed {\n\t\treturn fmt.Errorf(\"server failed: %w\", err)\n\t}\n\treturn nil\n}\n\nfunc (s *Server) Shutdown(ctx context.Context) {\n\t// Create a shutdown context with timeout\n\tshutdownCtx, cancel := context.WithTimeout(ctx, 30*time.Second)\n\tdefer cancel()\n\n\tnc := nats.GetClient()\n\tif nc != nil {\n\t\tnc.Close()\n\t}\n\n\t// First shut down the server gracefully (waiting for all ongoing requests)\n\tif err := s.server.Shutdown(shutdownCtx); err != nil {\n\t\tcclog.Errorf(\"Server shutdown error: %v\", err)\n\t}\n\n\t// Archive all the metric store data\n\tms := metricstore.GetMemoryStore()\n\n\tif ms != nil {\n\t\tmetricstore.Shutdown()\n\t}\n\n\t// Shutdown archiver with 10 second timeout for fast shutdown\n\tif err := archiver.Shutdown(10 * time.Second); err != nil {\n\t\tcclog.Warnf(\"Archiver shutdown: %v\", err)\n\t}\n}","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false},"sourceToolAssistantUUID":"0959ff73-124b-441a-ad83-6d7e972addba","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"02b5a16e-21c8-481a-bb9f-b5441d43b6e1","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01R7Q8fugxHFzMAmppY3QVac","type":"message","role":"assistant","content":[{"type":"thinking","thinking":"","signature":"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"}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":2260,"cache_read_input_tokens":56725,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":2260},"output_tokens":8,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZPDhK5q3WcxXwNUzXAJ2","type":"assistant","uuid":"20e0a0db-6633-4785-92ac-0fc9f5b28e48","timestamp":"2026-03-25T05:08:22.451Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"20e0a0db-6633-4785-92ac-0fc9f5b28e48","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01R7Q8fugxHFzMAmppY3QVac","type":"message","role":"assistant","content":[{"type":"text","text":"Found it. The \"Improve shutdown time\" commit (93a9d732) introduced a **hard 10-second deadline** for `metricstore.Shutdown()`. Previously it ran with no time limit. Let me verify the full Shutdown path:"}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":2260,"cache_read_input_tokens":56725,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":2260},"output_tokens":8,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZPDhK5q3WcxXwNUzXAJ2","type":"assistant","uuid":"230b9904-baa3-481b-b560-767f466d3230","timestamp":"2026-03-25T05:08:23.899Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"230b9904-baa3-481b-b560-767f466d3230","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01R7Q8fugxHFzMAmppY3QVac","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01Bro5EmwLjvvxYMChoZBwN4","name":"Read","input":{"file_path":"/Users/jan/prg/ClusterCockpit/cc-backend/pkg/metricstore/metricstore.go","offset":273,"limit":50},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":2260,"cache_read_input_tokens":56725,"output_tokens":514,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":2260,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CZPDhK5q3WcxXwNUzXAJ2","type":"assistant","uuid":"213ba1a2-6d52-4bd7-8333-31735153c7ee","timestamp":"2026-03-25T05:08:24.694Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"213ba1a2-6d52-4bd7-8333-31735153c7ee","isSidechain":false,"type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:Read","command":"callback"},"parentToolUseID":"toolu_01Bro5EmwLjvvxYMChoZBwN4","toolUseID":"toolu_01Bro5EmwLjvvxYMChoZBwN4","timestamp":"2026-03-25T05:08:24.713Z","uuid":"e46f899e-c3e9-4ebd-99aa-75ad83dbd281","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"213ba1a2-6d52-4bd7-8333-31735153c7ee","isSidechain":false,"promptId":"6055f42a-c78d-4b2b-b415-b0d8e1653078","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01Bro5EmwLjvvxYMChoZBwN4","type":"tool_result","content":" 273→func Shutdown() {\n 274→\tshutdownFuncMu.Lock()\n 275→\tdefer shutdownFuncMu.Unlock()\n 276→\tif shutdownFunc != nil {\n 277→\t\tshutdownFunc()\n 278→\t}\n 279→\n 280→\tif Keys.Checkpoints.FileFormat == \"wal\" {\n 281→\t\tfor _, ch := range walShardChs {\n 282→\t\t\tclose(ch)\n 283→\t\t}\n 284→\t}\n 285→\n 286→\tcclog.Infof(\"[METRICSTORE]> Writing to '%s'...\\n\", Keys.Checkpoints.RootDir)\n 287→\tvar files int\n 288→\tvar err error\n 289→\n 290→\tms := GetMemoryStore()\n 291→\n 292→\tlastCheckpointMu.Lock()\n 293→\tfrom := lastCheckpoint\n 294→\tlastCheckpointMu.Unlock()\n 295→\n 296→\tif Keys.Checkpoints.FileFormat == \"wal\" {\n 297→\t\tvar hostDirs []string\n 298→\t\tfiles, hostDirs, err = ms.ToCheckpointWAL(Keys.Checkpoints.RootDir, from.Unix(), time.Now().Unix())\n 299→\t\tif err == nil {\n 300→\t\t\tRotateWALFilesAfterShutdown(hostDirs)\n 301→\t\t}\n 302→\t} else {\n 303→\t\tfiles, err = ms.ToCheckpoint(Keys.Checkpoints.RootDir, from.Unix(), time.Now().Unix())\n 304→\t}\n 305→\n 306→\tif err != nil {\n 307→\t\tcclog.Errorf(\"[METRICSTORE]> Writing checkpoint failed: %s\\n\", err.Error())\n 308→\t}\n 309→\tcclog.Infof(\"[METRICSTORE]> Done! (%d files written)\\n\", files)\n 310→}\n 311→\n 312→// Retention starts a background goroutine that periodically frees old metric data.\n 313→//\n 314→// This worker runs at half the retention interval and calls Free() to remove buffers\n 315→// older than the configured retention time. It respects the NodeProvider to preserve\n 316→// data for nodes with active jobs.\n 317→//\n 318→// Parameters:\n 319→// - wg: WaitGroup to signal completion when context is cancelled\n 320→// - ctx: Context for cancellation signal\n 321→//\n 322→// The goroutine exits when ctx is cancelled."}]},"uuid":"29e6e611-3a69-46af-a113-060ac93f9351","timestamp":"2026-03-25T05:08:24.713Z","toolUseResult":{"type":"text","file":{"filePath":"/Users/jan/prg/ClusterCockpit/cc-backend/pkg/metricstore/metricstore.go","content":"func Shutdown() {\n\tshutdownFuncMu.Lock()\n\tdefer shutdownFuncMu.Unlock()\n\tif shutdownFunc != nil {\n\t\tshutdownFunc()\n\t}\n\n\tif Keys.Checkpoints.FileFormat == \"wal\" {\n\t\tfor _, ch := range walShardChs {\n\t\t\tclose(ch)\n\t\t}\n\t}\n\n\tcclog.Infof(\"[METRICSTORE]> Writing to '%s'...\\n\", Keys.Checkpoints.RootDir)\n\tvar files int\n\tvar err error\n\n\tms := GetMemoryStore()\n\n\tlastCheckpointMu.Lock()\n\tfrom := lastCheckpoint\n\tlastCheckpointMu.Unlock()\n\n\tif Keys.Checkpoints.FileFormat == \"wal\" {\n\t\tvar hostDirs []string\n\t\tfiles, hostDirs, err = ms.ToCheckpointWAL(Keys.Checkpoints.RootDir, from.Unix(), time.Now().Unix())\n\t\tif err == nil {\n\t\t\tRotateWALFilesAfterShutdown(hostDirs)\n\t\t}\n\t} else {\n\t\tfiles, err = ms.ToCheckpoint(Keys.Checkpoints.RootDir, from.Unix(), time.Now().Unix())\n\t}\n\n\tif err != nil {\n\t\tcclog.Errorf(\"[METRICSTORE]> Writing checkpoint failed: %s\\n\", err.Error())\n\t}\n\tcclog.Infof(\"[METRICSTORE]> Done! (%d files written)\\n\", files)\n}\n\n// Retention starts a background goroutine that periodically frees old metric data.\n//\n// This worker runs at half the retention interval and calls Free() to remove buffers\n// older than the configured retention time. It respects the NodeProvider to preserve\n// data for nodes with active jobs.\n//\n// Parameters:\n// - wg: WaitGroup to signal completion when context is cancelled\n// - ctx: Context for cancellation signal\n//\n// The goroutine exits when ctx is cancelled.","numLines":50,"startLine":273,"totalLines":804}},"sourceToolAssistantUUID":"213ba1a2-6d52-4bd7-8333-31735153c7ee","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"29e6e611-3a69-46af-a113-060ac93f9351","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01FfwTnrT6xdVt4PdTBYc9fB","type":"message","role":"assistant","content":[{"type":"text","text":"Here's the root cause:\n\n**In `server.go` (after 93a9d732):**\n```go\nselect {\ncase <-done:\ncase <-time.After(10 * time.Second):\n cclog.Warn(\"Shutdown deadline exceeded, forcing exit\")\n}\n```\n\n`metricstore.Shutdown()` writes 5800+ binary snapshot files for ~21GB of data, then calls `RotateWALFilesAfterShutdown()` to delete WAL files. This easily takes more than 10 seconds. When the deadline fires, the process exits before WAL rotation happens.\n\nOn next startup, the WAL files from the previous run are still there and must be replayed — they contain ALL data since the last successful WAL rotation. This accumulates across restarts.\n\nLet me also check `RotateWALFilesAfterShutdown`:"}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":1169,"cache_read_input_tokens":58985,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":1169},"output_tokens":1,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZPDiDaiVA85KBfRtXJko","type":"assistant","uuid":"e2b8a027-be10-474b-bc24-9e296d103465","timestamp":"2026-03-25T05:08:32.053Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"e2b8a027-be10-474b-bc24-9e296d103465","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01FfwTnrT6xdVt4PdTBYc9fB","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_013DnzfcyFTVGdbKb4xncdAf","name":"Grep","input":{"pattern":"func RotateWALFiles\"","path":"/Users/jan/prg/ClusterCockpit/cc-backend/pkg/metricstore","output_mode":"content","-n":true},"caller":{"type":"direct"}}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":1169,"cache_read_input_tokens":58985,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":1169},"output_tokens":1,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZPDiDaiVA85KBfRtXJko","type":"assistant","uuid":"635731e1-7aa8-4ea4-ba02-2d84a06fee0b","timestamp":"2026-03-25T05:08:33.566Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} 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found"}]},"uuid":"66626fc6-75fb-4415-a497-ec046844ebf1","timestamp":"2026-03-25T05:08:33.594Z","toolUseResult":{"mode":"content","numFiles":0,"filenames":[],"content":"","numLines":0},"sourceToolAssistantUUID":"635731e1-7aa8-4ea4-ba02-2d84a06fee0b","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"66626fc6-75fb-4415-a497-ec046844ebf1","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01FfwTnrT6xdVt4PdTBYc9fB","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01LhUQbRpn8V79ijjgSrNBt7","name":"Grep","input":{"pattern":"func 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Let me write the plan."}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":794,"cache_read_input_tokens":60154,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":794},"output_tokens":1,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZPDiuRbGezEn2mK8zNDf","type":"assistant","uuid":"afea080f-4031-4995-9186-c07a048c19de","timestamp":"2026-03-25T05:08:38.755Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"type":"file-history-snapshot","messageId":"51ce13c2-05d6-4f39-a970-dc16abb9938d","snapshot":{"messageId":"ce61fe79-a6e2-422f-9e35-63250af2d8e2","trackedFileBackups":{"/Users/jan/.claude/plans/peaceful-jingling-lobster.md":{"backupFileName":null,"version":1,"backupTime":"2026-03-25T05:08:52.026Z"}},"timestamp":"2026-03-25T05:06:32.603Z"},"isSnapshotUpdate":true} {"parentUuid":"afea080f-4031-4995-9186-c07a048c19de","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01DcUdooXYR1QmYt3f9oG1dQ","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01HcoMB1HawZh6hB5VExk3gk","name":"Write","input":{"file_path":"/Users/jan/.claude/plans/peaceful-jingling-lobster.md","content":"# Fix: Checkpoint loading regression (14s → 302s)\n\n## Context\n\nCommit `93a9d732` (\"Improve shutdown time\") introduced a **hard 10-second deadline** in `server.go`'s `Shutdown` method. `metricstore.Shutdown()` writes ~5800 binary snapshot files for ~21GB of data and then calls `RotateWALFilesAfterShutdown()` to delete WAL files. This checkpoint write takes well over 10 seconds. When the deadline fires, the process exits **before WAL rotation happens**.\n\nOn next startup, the un-rotated WAL files are replayed on top of the binary snapshots, causing the 302s load time. This problem compounds across restarts — WAL files keep growing.\n\n## Root Cause\n\n`cmd/cc-backend/server.go:415-450` (the new `Shutdown` method):\n```go\nselect {\ncase <-done:\ncase <-time.After(10 * time.Second):\n cclog.Warn(\"Shutdown deadline exceeded, forcing exit\")\n}\n```\n\n`metricstore.Shutdown()` runs inside the `done` goroutine but is killed by the 10s hard deadline before it can finish writing checkpoints and rotating WAL files.\n\n## Fix\n\n**File: `cmd/cc-backend/server.go`** — Remove the hard 10s deadline for metricstore shutdown. The metricstore must be allowed to complete its checkpoint write and WAL rotation.\n\nTwo options:\n\n### Option A: Increase the deadline (simple)\nChange `time.After(10 * time.Second)` to something generous like `time.After(120 * time.Second)`. This preserves the safety net against infinite hangs.\n\n### Option B: Remove the outer deadline, keep per-component timeouts (cleaner)\n- Let `metricstore.Shutdown()` run to completion (it already has bounded work — write N files then rotate)\n- Keep the archiver's own 10s timeout (`archiver.Shutdown(10 * time.Second)`)\n- Remove the outer `time.After` or increase it significantly\n\n**Recommended: Option A** — change `10 * time.Second` to `120 * time.Second`. Minimal change, fixes the issue, still has a safety net.\n\n## Verification\n\n1. Build: `go build ./cmd/cc-backend`\n2. Start with existing checkpoint data, confirm loading time returns to ~14s\n3. Send SIGTERM, confirm logs show checkpoint files written + \"Done!\" message (i.e., shutdown completes before deadline)\n4. Restart again, confirm WAL replay is minimal (fast startup)\n"},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":794,"cache_read_input_tokens":60154,"output_tokens":719,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":794,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CZPDiuRbGezEn2mK8zNDf","type":"assistant","uuid":"51ce13c2-05d6-4f39-a970-dc16abb9938d","timestamp":"2026-03-25T05:08:52.011Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"51ce13c2-05d6-4f39-a970-dc16abb9938d","isSidechain":false,"type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:Write","command":"callback"},"parentToolUseID":"toolu_01HcoMB1HawZh6hB5VExk3gk","toolUseID":"toolu_01HcoMB1HawZh6hB5VExk3gk","timestamp":"2026-03-25T05:08:52.028Z","uuid":"a360b02a-1da7-4347-b11b-f665b1341383","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"51ce13c2-05d6-4f39-a970-dc16abb9938d","isSidechain":false,"promptId":"6055f42a-c78d-4b2b-b415-b0d8e1653078","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01HcoMB1HawZh6hB5VExk3gk","type":"tool_result","content":"File created successfully at: /Users/jan/.claude/plans/peaceful-jingling-lobster.md"}]},"uuid":"26c69b74-808c-4e17-94d5-b970ef2852e4","timestamp":"2026-03-25T05:08:52.028Z","toolUseResult":{"type":"create","filePath":"/Users/jan/.claude/plans/peaceful-jingling-lobster.md","content":"# Fix: Checkpoint loading regression (14s → 302s)\n\n## Context\n\nCommit `93a9d732` (\"Improve shutdown time\") introduced a **hard 10-second deadline** in `server.go`'s `Shutdown` method. `metricstore.Shutdown()` writes ~5800 binary snapshot files for ~21GB of data and then calls `RotateWALFilesAfterShutdown()` to delete WAL files. This checkpoint write takes well over 10 seconds. When the deadline fires, the process exits **before WAL rotation happens**.\n\nOn next startup, the un-rotated WAL files are replayed on top of the binary snapshots, causing the 302s load time. This problem compounds across restarts — WAL files keep growing.\n\n## Root Cause\n\n`cmd/cc-backend/server.go:415-450` (the new `Shutdown` method):\n```go\nselect {\ncase <-done:\ncase <-time.After(10 * time.Second):\n cclog.Warn(\"Shutdown deadline exceeded, forcing exit\")\n}\n```\n\n`metricstore.Shutdown()` runs inside the `done` goroutine but is killed by the 10s hard deadline before it can finish writing checkpoints and rotating WAL files.\n\n## Fix\n\n**File: `cmd/cc-backend/server.go`** — Remove the hard 10s deadline for metricstore shutdown. The metricstore must be allowed to complete its checkpoint write and WAL rotation.\n\nTwo options:\n\n### Option A: Increase the deadline (simple)\nChange `time.After(10 * time.Second)` to something generous like `time.After(120 * time.Second)`. This preserves the safety net against infinite hangs.\n\n### Option B: Remove the outer deadline, keep per-component timeouts (cleaner)\n- Let `metricstore.Shutdown()` run to completion (it already has bounded work — write N files then rotate)\n- Keep the archiver's own 10s timeout (`archiver.Shutdown(10 * time.Second)`)\n- Remove the outer `time.After` or increase it significantly\n\n**Recommended: Option A** — change `10 * time.Second` to `120 * time.Second`. Minimal change, fixes the issue, still has a safety net.\n\n## Verification\n\n1. Build: `go build ./cmd/cc-backend`\n2. Start with existing checkpoint data, confirm loading time returns to ~14s\n3. Send SIGTERM, confirm logs show checkpoint files written + \"Done!\" message (i.e., shutdown completes before deadline)\n4. Restart again, confirm WAL replay is minimal (fast startup)\n","structuredPatch":[],"originalFile":null},"sourceToolAssistantUUID":"51ce13c2-05d6-4f39-a970-dc16abb9938d","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"26c69b74-808c-4e17-94d5-b970ef2852e4","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01M1rrAgLgJwtzQ86o22fzZ9","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01AatNK4vYZReUWh5NQqZyLC","name":"ToolSearch","input":{"query":"select:ExitPlanMode","max_results":1},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":754,"cache_read_input_tokens":60948,"output_tokens":78,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":754,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CZPDkESNABjwZqx3CC1pR","type":"assistant","uuid":"882a7303-cdf0-4ce7-bf76-bf1a254909cd","timestamp":"2026-03-25T05:08:57.080Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"882a7303-cdf0-4ce7-bf76-bf1a254909cd","isSidechain":false,"promptId":"6055f42a-c78d-4b2b-b415-b0d8e1653078","type":"user","message":{"role":"user","content":[{"type":"tool_result","tool_use_id":"toolu_01AatNK4vYZReUWh5NQqZyLC","content":[{"type":"tool_reference","tool_name":"ExitPlanMode"}]}]},"uuid":"d1b835df-46c7-4e29-864d-51da8c388eec","timestamp":"2026-03-25T05:08:57.083Z","toolUseResult":{"matches":["ExitPlanMode"],"query":"select:ExitPlanMode","total_deferred_tools":22},"sourceToolAssistantUUID":"882a7303-cdf0-4ce7-bf76-bf1a254909cd","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"d1b835df-46c7-4e29-864d-51da8c388eec","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01VYMay32hpjXY7NY1W3RMtZ","type":"message","role":"assistant","content":[{"type":"text","text":"\n\nThe root cause is commit `93a9d732` (\"Improve shutdown time\") which added a **hard 10-second deadline** around `metricstore.Shutdown()`. Writing ~5800 binary snapshots for 21GB takes well over 10s, so the process exits before `RotateWALFilesAfterShutdown()` runs. On next startup, the un-rotated WAL files are replayed in full — that's the 302s.\n\nThe fix is simply increasing the deadline from 10s to 120s in `server.go`."}],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":3,"cache_creation_input_tokens":738,"cache_read_input_tokens":61702,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":738},"output_tokens":2,"service_tier":"standard","inference_geo":"not_available"}},"requestId":"req_011CZPDkc6MXihzboxr5pFkT","type":"assistant","uuid":"edeec3ed-c824-4b95-9f8e-0bb8c4bac030","timestamp":"2026-03-25T05:09:04.373Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"edeec3ed-c824-4b95-9f8e-0bb8c4bac030","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01VYMay32hpjXY7NY1W3RMtZ","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01BqQUkzacfUADVoXMnTAmAT","name":"ExitPlanMode","input":{"allowedPrompts":[{"tool":"Bash","prompt":"build go project"}],"plan":"# Fix: Checkpoint loading regression (14s → 302s)\n\n## Context\n\nCommit `93a9d732` (\"Improve shutdown time\") introduced a **hard 10-second deadline** in `server.go`'s `Shutdown` method. `metricstore.Shutdown()` writes ~5800 binary snapshot files for ~21GB of data and then calls `RotateWALFilesAfterShutdown()` to delete WAL files. This checkpoint write takes well over 10 seconds. When the deadline fires, the process exits **before WAL rotation happens**.\n\nOn next startup, the un-rotated WAL files are replayed on top of the binary snapshots, causing the 302s load time. This problem compounds across restarts — WAL files keep growing.\n\n## Root Cause\n\n`cmd/cc-backend/server.go:415-450` (the new `Shutdown` method):\n```go\nselect {\ncase <-done:\ncase <-time.After(10 * time.Second):\n cclog.Warn(\"Shutdown deadline exceeded, forcing exit\")\n}\n```\n\n`metricstore.Shutdown()` runs inside the `done` goroutine but is killed by the 10s hard deadline before it can finish writing checkpoints and rotating WAL files.\n\n## Fix\n\n**File: `cmd/cc-backend/server.go`** — Remove the hard 10s deadline for metricstore shutdown. The metricstore must be allowed to complete its checkpoint write and WAL rotation.\n\nTwo options:\n\n### Option A: Increase the deadline (simple)\nChange `time.After(10 * time.Second)` to something generous like `time.After(120 * time.Second)`. This preserves the safety net against infinite hangs.\n\n### Option B: Remove the outer deadline, keep per-component timeouts (cleaner)\n- Let `metricstore.Shutdown()` run to completion (it already has bounded work — write N files then rotate)\n- Keep the archiver's own 10s timeout (`archiver.Shutdown(10 * time.Second)`)\n- Remove the outer `time.After` or increase it significantly\n\n**Recommended: Option A** — change `10 * time.Second` to `120 * time.Second`. Minimal change, fixes the issue, still has a safety net.\n\n## Verification\n\n1. Build: `go build ./cmd/cc-backend`\n2. Start with existing checkpoint data, confirm loading time returns to ~14s\n3. Send SIGTERM, confirm logs show checkpoint files written + \"Done!\" message (i.e., shutdown completes before deadline)\n4. Restart again, confirm WAL replay is minimal (fast startup)\n","planFilePath":"/Users/jan/.claude/plans/peaceful-jingling-lobster.md"},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"usage":{"input_tokens":3,"cache_creation_input_tokens":738,"cache_read_input_tokens":61702,"output_tokens":204,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":738,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CZPDkc6MXihzboxr5pFkT","type":"assistant","uuid":"ce9feb40-0fa3-4e60-92d8-ab22646e3c62","timestamp":"2026-03-25T05:09:04.640Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"ce9feb40-0fa3-4e60-92d8-ab22646e3c62","isSidechain":false,"promptId":"6055f42a-c78d-4b2b-b415-b0d8e1653078","type":"user","message":{"role":"user","content":[{"type":"tool_result","content":"User has approved your plan. You can now start coding. Start with updating your todo list if applicable\n\nYour plan has been saved to: /Users/jan/.claude/plans/peaceful-jingling-lobster.md\nYou can refer back to it if needed during implementation.\n\n## Approved Plan:\n# Fix: Checkpoint loading regression (14s → 302s)\n\n## Context\n\nCommit `93a9d732` (\"Improve shutdown time\") introduced a **hard 10-second deadline** in `server.go`'s `Shutdown` method. `metricstore.Shutdown()` writes ~5800 binary snapshot files for ~21GB of data and then calls `RotateWALFilesAfterShutdown()` to delete WAL files. This checkpoint write takes well over 10 seconds. When the deadline fires, the process exits **before WAL rotation happens**.\n\nOn next startup, the un-rotated WAL files are replayed on top of the binary snapshots, causing the 302s load time. This problem compounds across restarts — WAL files keep growing.\n\n## Root Cause\n\n`cmd/cc-backend/server.go:415-450` (the new `Shutdown` method):\n```go\nselect {\ncase <-done:\ncase <-time.After(10 * time.Second):\n cclog.Warn(\"Shutdown deadline exceeded, forcing exit\")\n}\n```\n\n`metricstore.Shutdown()` runs inside the `done` goroutine but is killed by the 10s hard deadline before it can finish writing checkpoints and rotating WAL files.\n\n## Fix\n\n**File: `cmd/cc-backend/server.go`** — Remove the hard 10s deadline for metricstore shutdown. The metricstore must be allowed to complete its checkpoint write and WAL rotation.\n\nTwo options:\n\n### Option A: Increase the deadline (simple)\nChange `time.After(10 * time.Second)` to something generous like `time.After(120 * time.Second)`. This preserves the safety net against infinite hangs.\n\n### Option B: Remove the outer deadline, keep per-component timeouts (cleaner)\n- Let `metricstore.Shutdown()` run to completion (it already has bounded work — write N files then rotate)\n- Keep the archiver's own 10s timeout (`archiver.Shutdown(10 * time.Second)`)\n- Remove the outer `time.After` or increase it significantly\n\n**Recommended: Option A** — change `10 * time.Second` to `120 * time.Second`. Minimal change, fixes the issue, still has a safety net.\n\n## Verification\n\n1. Build: `go build ./cmd/cc-backend`\n2. Start with existing checkpoint data, confirm loading time returns to ~14s\n3. Send SIGTERM, confirm logs show checkpoint files written + \"Done!\" message (i.e., shutdown completes before deadline)\n4. Restart again, confirm WAL replay is minimal (fast startup)\n","tool_use_id":"toolu_01BqQUkzacfUADVoXMnTAmAT"}]},"uuid":"3d30b4b6-6ff0-4fdd-94a1-5805caf8778b","timestamp":"2026-03-25T05:10:56.003Z","toolUseResult":{"plan":"# Fix: Checkpoint loading regression (14s → 302s)\n\n## Context\n\nCommit `93a9d732` (\"Improve shutdown time\") introduced a **hard 10-second deadline** in `server.go`'s `Shutdown` method. `metricstore.Shutdown()` writes ~5800 binary snapshot files for ~21GB of data and then calls `RotateWALFilesAfterShutdown()` to delete WAL files. This checkpoint write takes well over 10 seconds. When the deadline fires, the process exits **before WAL rotation happens**.\n\nOn next startup, the un-rotated WAL files are replayed on top of the binary snapshots, causing the 302s load time. This problem compounds across restarts — WAL files keep growing.\n\n## Root Cause\n\n`cmd/cc-backend/server.go:415-450` (the new `Shutdown` method):\n```go\nselect {\ncase <-done:\ncase <-time.After(10 * time.Second):\n cclog.Warn(\"Shutdown deadline exceeded, forcing exit\")\n}\n```\n\n`metricstore.Shutdown()` runs inside the `done` goroutine but is killed by the 10s hard deadline before it can finish writing checkpoints and rotating WAL files.\n\n## Fix\n\n**File: `cmd/cc-backend/server.go`** — Remove the hard 10s deadline for metricstore shutdown. The metricstore must be allowed to complete its checkpoint write and WAL rotation.\n\nTwo options:\n\n### Option A: Increase the deadline (simple)\nChange `time.After(10 * time.Second)` to something generous like `time.After(120 * time.Second)`. This preserves the safety net against infinite hangs.\n\n### Option B: Remove the outer deadline, keep per-component timeouts (cleaner)\n- Let `metricstore.Shutdown()` run to completion (it already has bounded work — write N files then rotate)\n- Keep the archiver's own 10s timeout (`archiver.Shutdown(10 * time.Second)`)\n- Remove the outer `time.After` or increase it significantly\n\n**Recommended: Option A** — change `10 * time.Second` to `120 * time.Second`. Minimal change, fixes the issue, still has a safety net.\n\n## Verification\n\n1. Build: `go build ./cmd/cc-backend`\n2. Start with existing checkpoint data, confirm loading time returns to ~14s\n3. Send SIGTERM, confirm logs show checkpoint files written + \"Done!\" message (i.e., shutdown completes before deadline)\n4. 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ms != nil {\n 431→\t\t\twg.Go(func() {\n 432→\t\t\t\tmetricstore.Shutdown()\n 433→\t\t\t})\n 434→\t\t}\n 435→\n 436→\t\twg.Go(func() {\n 437→\t\t\tif err := archiver.Shutdown(10 * time.Second); err != nil {\n 438→\t\t\t\tcclog.Warnf(\"Archiver shutdown: %v\", err)\n 439→\t\t\t}\n 440→\t\t})\n 441→\n 442→\t\twg.Wait()\n 443→\t}()\n 444→\n 445→\tselect {\n 446→\tcase <-done:\n 447→\tcase <-time.After(10 * time.Second):\n 448→\t\tcclog.Warn(\"Shutdown deadline exceeded, forcing exit\")\n 449→\t}\n 450→}\n 451→"}]},"uuid":"94838fc9-4a29-43e4-a9de-d0b5866ebb76","timestamp":"2026-03-25T05:11:07.574Z","toolUseResult":{"type":"text","file":{"filePath":"/Users/jan/prg/ClusterCockpit/cc-backend/cmd/cc-backend/server.go","content":"\t\tif ms := metricstore.GetMemoryStore(); ms != nil {\n\t\t\twg.Go(func() {\n\t\t\t\tmetricstore.Shutdown()\n\t\t\t})\n\t\t}\n\n\t\twg.Go(func() {\n\t\t\tif err := archiver.Shutdown(10 * time.Second); err != nil {\n\t\t\t\tcclog.Warnf(\"Archiver shutdown: %v\", err)\n\t\t\t}\n\t\t})\n\n\t\twg.Wait()\n\t}()\n\n\tselect {\n\tcase <-done:\n\tcase <-time.After(10 * time.Second):\n\t\tcclog.Warn(\"Shutdown deadline exceeded, forcing exit\")\n\t}\n}\n","numLines":22,"startLine":430,"totalLines":451}},"sourceToolAssistantUUID":"59a99253-def7-446b-8aab-6d0b69da23a0","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"type":"file-history-snapshot","messageId":"5dfcb083-867c-4c33-8947-6e96be5b82ee","snapshot":{"messageId":"ce61fe79-a6e2-422f-9e35-63250af2d8e2","trackedFileBackups":{"/Users/jan/.claude/plans/peaceful-jingling-lobster.md":{"backupFileName":null,"version":1,"backupTime":"2026-03-25T05:08:52.026Z"},"cmd/cc-backend/server.go":{"backupFileName":"52a9e99169bfa641@v1","version":1,"backupTime":"2026-03-25T05:11:13.208Z"}},"timestamp":"2026-03-25T05:06:32.603Z"},"isSnapshotUpdate":true} {"parentUuid":"94838fc9-4a29-43e4-a9de-d0b5866ebb76","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_01AQ9zt84HM1fy1FZbZCcckj","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01XcDkqYBHnWhU5hsmnVB354","name":"Edit","input":{"replace_all":false,"file_path":"/Users/jan/prg/ClusterCockpit/cc-backend/cmd/cc-backend/server.go","old_string":"\tcase <-time.After(10 * time.Second):","new_string":"\tcase <-time.After(120 * time.Second):"},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":1327,"cache_read_input_tokens":62440,"output_tokens":145,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":1327,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CZPDvE4KbNwokZTzVc1Zh","type":"assistant","uuid":"5dfcb083-867c-4c33-8947-6e96be5b82ee","timestamp":"2026-03-25T05:11:13.189Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"5dfcb083-867c-4c33-8947-6e96be5b82ee","isSidechain":false,"type":"progress","data":{"type":"hook_progress","hookEvent":"PostToolUse","hookName":"PostToolUse:Edit","command":"callback"},"parentToolUseID":"toolu_01XcDkqYBHnWhU5hsmnVB354","toolUseID":"toolu_01XcDkqYBHnWhU5hsmnVB354","timestamp":"2026-03-25T05:11:13.211Z","uuid":"aca5ccbc-866c-44cb-8584-05faba35da53","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"5dfcb083-867c-4c33-8947-6e96be5b82ee","isSidechain":false,"promptId":"6055f42a-c78d-4b2b-b415-b0d8e1653078","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01XcDkqYBHnWhU5hsmnVB354","type":"tool_result","content":"The file /Users/jan/prg/ClusterCockpit/cc-backend/cmd/cc-backend/server.go has been updated successfully."}]},"uuid":"e54ec82e-3174-4143-abea-139eaaf864d7","timestamp":"2026-03-25T05:11:13.211Z","toolUseResult":{"filePath":"/Users/jan/prg/ClusterCockpit/cc-backend/cmd/cc-backend/server.go","oldString":"\tcase <-time.After(10 * time.Second):","newString":"\tcase <-time.After(120 * time.Second):","originalFile":"// Copyright (C) NHR@FAU, University Erlangen-Nuremberg.\n// All rights reserved. This file is part of cc-backend.\n// Use of this source code is governed by a MIT-style\n// license that can be found in the LICENSE file.\n\n// Package main provides the entry point for the ClusterCockpit backend server.\n// This file contains HTTP server setup, routing configuration, and\n// authentication middleware integration.\npackage main\n\nimport (\n\t\"context\"\n\t\"crypto/tls\"\n\t\"encoding/json\"\n\t\"errors\"\n\t\"fmt\"\n\t\"net\"\n\t\"net/http\"\n\t\"os\"\n\t\"strings\"\n\t\"sync\"\n\t\"time\"\n\n\t\"github.com/99designs/gqlgen/graphql\"\n\t\"github.com/99designs/gqlgen/graphql/handler\"\n\t\"github.com/99designs/gqlgen/graphql/handler/transport\"\n\t\"github.com/99designs/gqlgen/graphql/playground\"\n\t\"github.com/ClusterCockpit/cc-backend/internal/api\"\n\t\"github.com/ClusterCockpit/cc-backend/internal/archiver\"\n\t\"github.com/ClusterCockpit/cc-backend/internal/auth\"\n\t\"github.com/ClusterCockpit/cc-backend/internal/config\"\n\t\"github.com/ClusterCockpit/cc-backend/internal/graph\"\n\t\"github.com/ClusterCockpit/cc-backend/internal/graph/generated\"\n\t\"github.com/ClusterCockpit/cc-backend/internal/routerConfig\"\n\t\"github.com/ClusterCockpit/cc-backend/pkg/metricstore\"\n\t\"github.com/ClusterCockpit/cc-backend/web\"\n\tcclog \"github.com/ClusterCockpit/cc-lib/v2/ccLogger\"\n\t\"github.com/ClusterCockpit/cc-lib/v2/nats\"\n\t\"github.com/ClusterCockpit/cc-lib/v2/runtime\"\n\t\"github.com/go-chi/chi/v5\"\n\t\"github.com/go-chi/chi/v5/middleware\"\n\t\"github.com/go-chi/cors\"\n\thttpSwagger \"github.com/swaggo/http-swagger\"\n)\n\nvar buildInfo web.Build\n\n// Environment variable names\nconst (\n\tenvDebug = \"DEBUG\"\n)\n\n// Server encapsulates the HTTP server state and dependencies\ntype Server struct {\n\trouter chi.Router\n\tserver *http.Server\n\trestAPIHandle *api.RestAPI\n\tnatsAPIHandle *api.NatsAPI\n}\n\nfunc onFailureResponse(rw http.ResponseWriter, r *http.Request, err error) {\n\trw.Header().Add(\"Content-Type\", \"application/json\")\n\trw.WriteHeader(http.StatusUnauthorized)\n\tjson.NewEncoder(rw).Encode(map[string]string{\n\t\t\"status\": http.StatusText(http.StatusUnauthorized),\n\t\t\"error\": err.Error(),\n\t})\n}\n\n// NewServer creates and initializes a new Server instance\nfunc NewServer(version, commit, buildDate string) (*Server, error) {\n\tbuildInfo = web.Build{Version: version, Hash: commit, Buildtime: buildDate}\n\n\ts := &Server{\n\t\trouter: chi.NewRouter(),\n\t}\n\n\tif err := s.init(); err != nil {\n\t\treturn nil, err\n\t}\n\n\treturn s, nil\n}\n\nfunc (s *Server) init() error {\n\t// Setup the http.Handler/Router used by the server\n\tgraph.Init()\n\tresolver := graph.GetResolverInstance()\n\tgraphQLServer := handler.New(\n\t\tgenerated.NewExecutableSchema(generated.Config{Resolvers: resolver}))\n\n\tgraphQLServer.AddTransport(transport.POST{})\n\n\t// Inject a per-request stats cache so that grouped statistics queries\n\t// sharing the same (filter, groupBy) pair are executed only once.\n\tgraphQLServer.AroundOperations(func(ctx context.Context, next graphql.OperationHandler) graphql.ResponseHandler {\n\t\treturn next(graph.WithStatsGroupCache(ctx))\n\t})\n\n\tif os.Getenv(envDebug) != \"1\" {\n\t\t// Having this handler means that a error message is returned via GraphQL instead of the connection simply beeing closed.\n\t\t// The problem with this is that then, no more stacktrace is printed to stderr.\n\t\tgraphQLServer.SetRecoverFunc(func(ctx context.Context, err any) error {\n\t\t\tswitch e := err.(type) {\n\t\t\tcase string:\n\t\t\t\treturn fmt.Errorf(\"MAIN > Panic: %s\", e)\n\t\t\tcase error:\n\t\t\t\treturn fmt.Errorf(\"MAIN > Panic caused by: %s\", e.Error())\n\t\t\t}\n\n\t\t\treturn errors.New(\"MAIN > Internal server error (panic)\")\n\t\t})\n\t}\n\n\tauthHandle := auth.GetAuthInstance()\n\n\t// Middleware must be defined before routes in chi\n\ts.router.Use(func(next http.Handler) http.Handler {\n\t\treturn http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {\n\t\t\tstart := time.Now()\n\t\t\tww := middleware.NewWrapResponseWriter(rw, r.ProtoMajor)\n\t\t\tnext.ServeHTTP(ww, r)\n\t\t\tcclog.Debugf(\"%s %s (%d, %.02fkb, %dms)\",\n\t\t\t\tr.Method, r.URL.RequestURI(),\n\t\t\t\tww.Status(), float32(ww.BytesWritten())/1024,\n\t\t\t\ttime.Since(start).Milliseconds())\n\t\t})\n\t})\n\ts.router.Use(middleware.Compress(5))\n\ts.router.Use(middleware.Recoverer)\n\ts.router.Use(cors.Handler(cors.Options{\n\t\tAllowCredentials: true,\n\t\tAllowedHeaders: []string{\"X-Requested-With\", \"Content-Type\", \"Authorization\", \"Origin\"},\n\t\tAllowedMethods: []string{\"GET\", \"POST\", \"HEAD\", \"OPTIONS\"},\n\t\tAllowedOrigins: []string{\"*\"},\n\t}))\n\n\ts.restAPIHandle = api.New()\n\n\tinfo := map[string]any{}\n\tinfo[\"hasOpenIDConnect\"] = false\n\n\tif auth.Keys.OpenIDConfig != nil {\n\t\topenIDConnect := auth.NewOIDC(authHandle)\n\t\topenIDConnect.RegisterEndpoints(s.router)\n\t\tinfo[\"hasOpenIDConnect\"] = true\n\t}\n\n\ts.router.Get(\"/login\", func(rw http.ResponseWriter, r *http.Request) {\n\t\trw.Header().Add(\"Content-Type\", \"text/html; charset=utf-8\")\n\t\tcclog.Debugf(\"##%v##\", info)\n\t\tweb.RenderTemplate(rw, \"login.tmpl\", &web.Page{Title: \"Login\", Build: buildInfo, Infos: info})\n\t})\n\ts.router.HandleFunc(\"/imprint\", func(rw http.ResponseWriter, r *http.Request) {\n\t\trw.Header().Add(\"Content-Type\", \"text/html; charset=utf-8\")\n\t\tweb.RenderTemplate(rw, \"imprint.tmpl\", &web.Page{Title: \"Imprint\", Build: buildInfo})\n\t})\n\ts.router.HandleFunc(\"/privacy\", func(rw http.ResponseWriter, r *http.Request) {\n\t\trw.Header().Add(\"Content-Type\", \"text/html; charset=utf-8\")\n\t\tweb.RenderTemplate(rw, \"privacy.tmpl\", &web.Page{Title: \"Privacy\", Build: buildInfo})\n\t})\n\n\tif !config.Keys.DisableAuthentication {\n\t\t// Create login failure handler (used by both /login and /jwt-login)\n\t\tloginFailureHandler := func(rw http.ResponseWriter, r *http.Request, err error) {\n\t\t\trw.Header().Add(\"Content-Type\", \"text/html; charset=utf-8\")\n\t\t\trw.WriteHeader(http.StatusUnauthorized)\n\t\t\tweb.RenderTemplate(rw, \"login.tmpl\", &web.Page{\n\t\t\t\tTitle: \"Login failed - ClusterCockpit\",\n\t\t\t\tMsgType: \"alert-warning\",\n\t\t\t\tMessage: err.Error(),\n\t\t\t\tBuild: buildInfo,\n\t\t\t\tInfos: info,\n\t\t\t})\n\t\t}\n\n\t\ts.router.Post(\"/login\", authHandle.Login(loginFailureHandler).ServeHTTP)\n\t\ts.router.HandleFunc(\"/jwt-login\", authHandle.Login(loginFailureHandler).ServeHTTP)\n\n\t\ts.router.Post(\"/logout\", authHandle.Logout(\n\t\t\thttp.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {\n\t\t\t\trw.Header().Add(\"Content-Type\", \"text/html; charset=utf-8\")\n\t\t\t\trw.WriteHeader(http.StatusOK)\n\t\t\t\tweb.RenderTemplate(rw, \"login.tmpl\", &web.Page{\n\t\t\t\t\tTitle: \"Bye - ClusterCockpit\",\n\t\t\t\t\tMsgType: \"alert-info\",\n\t\t\t\t\tMessage: \"Logout successful\",\n\t\t\t\t\tBuild: buildInfo,\n\t\t\t\t\tInfos: info,\n\t\t\t\t})\n\t\t\t})).ServeHTTP)\n\t}\n\n\tif flagDev {\n\t\ts.router.Handle(\"/playground\", playground.Handler(\"GraphQL playground\", \"/query\"))\n\t\ts.router.Get(\"/swagger/*\", httpSwagger.Handler(\n\t\t\thttpSwagger.URL(\"http://\"+config.Keys.Addr+\"/swagger/doc.json\")))\n\t}\n\n\t// Secured routes (require authentication)\n\ts.router.Group(func(secured chi.Router) {\n\t\tif !config.Keys.DisableAuthentication {\n\t\t\tsecured.Use(func(next http.Handler) http.Handler {\n\t\t\t\treturn authHandle.Auth(\n\t\t\t\t\tnext,\n\t\t\t\t\tfunc(rw http.ResponseWriter, r *http.Request, err error) {\n\t\t\t\t\t\trw.WriteHeader(http.StatusUnauthorized)\n\t\t\t\t\t\tweb.RenderTemplate(rw, \"login.tmpl\", &web.Page{\n\t\t\t\t\t\t\tTitle: \"Authentication failed - ClusterCockpit\",\n\t\t\t\t\t\t\tMsgType: \"alert-danger\",\n\t\t\t\t\t\t\tMessage: err.Error(),\n\t\t\t\t\t\t\tBuild: buildInfo,\n\t\t\t\t\t\t\tInfos: info,\n\t\t\t\t\t\t\tRedirect: r.RequestURI,\n\t\t\t\t\t\t})\n\t\t\t\t\t})\n\t\t\t})\n\t\t}\n\n\t\tsecured.Handle(\"/query\", graphQLServer)\n\n\t\tsecured.HandleFunc(\"/search\", func(rw http.ResponseWriter, r *http.Request) {\n\t\t\trouterConfig.HandleSearchBar(rw, r, buildInfo)\n\t\t})\n\n\t\trouterConfig.SetupRoutes(secured, buildInfo)\n\t})\n\n\t// API routes (JWT token auth)\n\ts.router.Route(\"/api\", func(apiRouter chi.Router) {\n\t\t// Main API routes with API auth\n\t\tapiRouter.Group(func(securedapi chi.Router) {\n\t\t\tif !config.Keys.DisableAuthentication {\n\t\t\t\tsecuredapi.Use(func(next http.Handler) http.Handler {\n\t\t\t\t\treturn authHandle.AuthAPI(next, onFailureResponse)\n\t\t\t\t})\n\t\t\t}\n\t\t\ts.restAPIHandle.MountAPIRoutes(securedapi)\n\t\t})\n\n\t\t// Metric store API routes with separate auth\n\t\tapiRouter.Group(func(metricstoreapi chi.Router) {\n\t\t\tif !config.Keys.DisableAuthentication {\n\t\t\t\tmetricstoreapi.Use(func(next http.Handler) http.Handler {\n\t\t\t\t\treturn authHandle.AuthMetricStoreAPI(next, onFailureResponse)\n\t\t\t\t})\n\t\t\t}\n\t\t\ts.restAPIHandle.MountMetricStoreAPIRoutes(metricstoreapi)\n\t\t})\n\t})\n\n\t// User API routes\n\ts.router.Route(\"/userapi\", func(userapi chi.Router) {\n\t\tif !config.Keys.DisableAuthentication {\n\t\t\tuserapi.Use(func(next http.Handler) http.Handler {\n\t\t\t\treturn authHandle.AuthUserAPI(next, onFailureResponse)\n\t\t\t})\n\t\t}\n\t\ts.restAPIHandle.MountUserAPIRoutes(userapi)\n\t})\n\n\t// Config API routes (uses Group with full paths to avoid shadowing\n\t// the /config page route that is registered in the secured group)\n\ts.router.Group(func(configapi chi.Router) {\n\t\tif !config.Keys.DisableAuthentication {\n\t\t\tconfigapi.Use(func(next http.Handler) http.Handler {\n\t\t\t\treturn authHandle.AuthConfigAPI(next, onFailureResponse)\n\t\t\t})\n\t\t}\n\t\ts.restAPIHandle.MountConfigAPIRoutes(configapi)\n\t})\n\n\t// Frontend API routes\n\ts.router.Route(\"/frontend\", func(frontendapi chi.Router) {\n\t\tif !config.Keys.DisableAuthentication {\n\t\t\tfrontendapi.Use(func(next http.Handler) http.Handler {\n\t\t\t\treturn authHandle.AuthFrontendAPI(next, onFailureResponse)\n\t\t\t})\n\t\t}\n\t\ts.restAPIHandle.MountFrontendAPIRoutes(frontendapi)\n\t})\n\n\tif config.Keys.APISubjects != nil {\n\t\ts.natsAPIHandle = api.NewNatsAPI()\n\t\tif err := s.natsAPIHandle.StartSubscriptions(); err != nil {\n\t\t\treturn fmt.Errorf(\"starting NATS subscriptions: %w\", err)\n\t\t}\n\t}\n\n\t// 404 handler for pages and API routes\n\tnotFoundHandler := func(rw http.ResponseWriter, r *http.Request) {\n\t\tif strings.HasPrefix(r.URL.Path, \"/api/\") || strings.HasPrefix(r.URL.Path, \"/userapi/\") ||\n\t\t\tstrings.HasPrefix(r.URL.Path, \"/frontend/\") || strings.HasPrefix(r.URL.Path, \"/config/\") {\n\t\t\trw.Header().Set(\"Content-Type\", \"application/json\")\n\t\t\trw.WriteHeader(http.StatusNotFound)\n\t\t\tjson.NewEncoder(rw).Encode(map[string]string{\n\t\t\t\t\"status\": \"Resource not found\",\n\t\t\t\t\"error\": \"the requested endpoint does not exist\",\n\t\t\t})\n\t\t\treturn\n\t\t}\n\t\trw.Header().Set(\"Content-Type\", \"text/html; charset=utf-8\")\n\t\trw.WriteHeader(http.StatusNotFound)\n\t\tweb.RenderTemplate(rw, \"404.tmpl\", &web.Page{\n\t\t\tTitle: \"Page Not Found\",\n\t\t\tBuild: buildInfo,\n\t\t})\n\t}\n\n\t// Set NotFound on the router so chi uses it for all unmatched routes,\n\t// including those under subrouters like /api, /userapi, /frontend, etc.\n\ts.router.NotFound(notFoundHandler)\n\n\tif config.Keys.EmbedStaticFiles {\n\t\tif i, err := os.Stat(\"./var/img\"); err == nil {\n\t\t\tif i.IsDir() {\n\t\t\t\tcclog.Info(\"Use local directory for static images\")\n\t\t\t\ts.router.Handle(\"/img/*\", http.StripPrefix(\"/img/\", http.FileServer(http.Dir(\"./var/img\"))))\n\t\t\t}\n\t\t}\n\t\tfileServer := http.StripPrefix(\"/\", web.ServeFiles())\n\t\ts.router.Handle(\"/*\", http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {\n\t\t\tif web.StaticFileExists(r.URL.Path) {\n\t\t\t\tfileServer.ServeHTTP(rw, r)\n\t\t\t\treturn\n\t\t\t}\n\t\t\tnotFoundHandler(rw, r)\n\t\t}))\n\t} else {\n\t\tstaticDir := http.Dir(config.Keys.StaticFiles)\n\t\tfileServer := http.FileServer(staticDir)\n\t\ts.router.Handle(\"/*\", http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {\n\t\t\tf, err := staticDir.Open(r.URL.Path)\n\t\t\tif err == nil {\n\t\t\t\tf.Close()\n\t\t\t\tfileServer.ServeHTTP(rw, r)\n\t\t\t\treturn\n\t\t\t}\n\t\t\tnotFoundHandler(rw, r)\n\t\t}))\n\t}\n\n\treturn nil\n}\n\n// Server timeout defaults (in seconds)\nconst (\n\tdefaultReadHeaderTimeout = 20\n\tdefaultWriteTimeout = 20\n)\n\nfunc (s *Server) Start(ctx context.Context) error {\n\t// Use configurable timeouts with defaults\n\treadHeaderTimeout := time.Duration(defaultReadHeaderTimeout) * time.Second\n\twriteTimeout := time.Duration(defaultWriteTimeout) * time.Second\n\n\ts.server = &http.Server{\n\t\tReadHeaderTimeout: readHeaderTimeout,\n\t\tWriteTimeout: writeTimeout,\n\t\tHandler: s.router,\n\t\tAddr: config.Keys.Addr,\n\t}\n\n\t// Start http or https server\n\tlistener, err := net.Listen(\"tcp\", config.Keys.Addr)\n\tif err != nil {\n\t\treturn fmt.Errorf(\"starting listener on '%s': %w\", config.Keys.Addr, err)\n\t}\n\n\tif !strings.HasSuffix(config.Keys.Addr, \":80\") && config.Keys.RedirectHTTPTo != \"\" {\n\t\tgo func() {\n\t\t\thttp.ListenAndServe(\":80\", http.RedirectHandler(config.Keys.RedirectHTTPTo, http.StatusMovedPermanently))\n\t\t}()\n\t}\n\n\tif config.Keys.HTTPSCertFile != \"\" && config.Keys.HTTPSKeyFile != \"\" {\n\t\tcert, err := tls.LoadX509KeyPair(\n\t\t\tconfig.Keys.HTTPSCertFile, config.Keys.HTTPSKeyFile)\n\t\tif err != nil {\n\t\t\treturn fmt.Errorf(\"loading X509 keypair (check 'https-cert-file' and 'https-key-file' in config.json): %w\", err)\n\t\t}\n\t\tlistener = tls.NewListener(listener, &tls.Config{\n\t\t\tCertificates: []tls.Certificate{cert},\n\t\t\tCipherSuites: []uint16{\n\t\t\t\ttls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,\n\t\t\t\ttls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,\n\t\t\t},\n\t\t\tMinVersion: tls.VersionTLS12,\n\t\t\tPreferServerCipherSuites: true,\n\t\t})\n\t\tcclog.Infof(\"HTTPS server listening at %s...\", config.Keys.Addr)\n\t} else {\n\t\tcclog.Infof(\"HTTP server listening at %s...\", config.Keys.Addr)\n\t}\n\t//\n\t// Because this program will want to bind to a privileged port (like 80), the listener must\n\t// be established first, then the user can be changed, and after that,\n\t// the actual http server can be started.\n\tif err := runtime.DropPrivileges(config.Keys.Group, config.Keys.User); err != nil {\n\t\treturn fmt.Errorf(\"dropping privileges: %w\", err)\n\t}\n\n\tif err = s.server.Serve(listener); err != nil && err != http.ErrServerClosed {\n\t\treturn fmt.Errorf(\"server failed: %w\", err)\n\t}\n\treturn nil\n}\n\nfunc (s *Server) Shutdown(ctx context.Context) {\n\tshutdownCtx, cancel := context.WithTimeout(ctx, 5*time.Second)\n\tdefer cancel()\n\n\tnc := nats.GetClient()\n\tif nc != nil {\n\t\tnc.Close()\n\t}\n\n\tif err := s.server.Shutdown(shutdownCtx); err != nil {\n\t\tcclog.Errorf(\"Server shutdown error: %v\", err)\n\t}\n\n\t// Run metricstore and archiver shutdown concurrently.\n\t// They are independent: metricstore writes .bin snapshots,\n\t// archiver flushes pending job archives.\n\tdone := make(chan struct{})\n\tgo func() {\n\t\tdefer close(done)\n\t\tvar wg sync.WaitGroup\n\n\t\tif ms := metricstore.GetMemoryStore(); ms != nil {\n\t\t\twg.Go(func() {\n\t\t\t\tmetricstore.Shutdown()\n\t\t\t})\n\t\t}\n\n\t\twg.Go(func() {\n\t\t\tif err := archiver.Shutdown(10 * time.Second); err != nil {\n\t\t\t\tcclog.Warnf(\"Archiver shutdown: %v\", err)\n\t\t\t}\n\t\t})\n\n\t\twg.Wait()\n\t}()\n\n\tselect {\n\tcase <-done:\n\tcase <-time.After(10 * time.Second):\n\t\tcclog.Warn(\"Shutdown deadline exceeded, forcing exit\")\n\t}\n}\n","structuredPatch":[{"oldStart":444,"oldLines":7,"newStart":444,"newLines":7,"lines":[" "," select {"," case <-done:","- case <-time.After(10 * time.Second):","+ case <-time.After(120 * time.Second):"," cclog.Warn(\"Shutdown deadline exceeded, forcing exit\")"," }"," }"]}],"userModified":false,"replaceAll":false},"sourceToolAssistantUUID":"5dfcb083-867c-4c33-8947-6e96be5b82ee","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"e54ec82e-3174-4143-abea-139eaaf864d7","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_013sihc8D321KTiv4AHUFdHm","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_019ar2yMHAZbXLkz6vsi6Jme","name":"Bash","input":{"command":"go build ./cmd/cc-backend","description":"Build the project"},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":563,"cache_read_input_tokens":63413,"output_tokens":97,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":563,"ephemeral_5m_input_tokens":0},"inference_geo":"","iterations":[],"speed":"standard"}},"requestId":"req_011CZPDvfXGLJCB9wLrgzXsZ","type":"assistant","uuid":"4c325081-d633-49f5-9fdf-462e64aa215a","timestamp":"2026-03-25T05:11:22.647Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"4c325081-d633-49f5-9fdf-462e64aa215a","isSidechain":false,"promptId":"6055f42a-c78d-4b2b-b415-b0d8e1653078","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_019ar2yMHAZbXLkz6vsi6Jme","type":"tool_result","content":"(Bash completed with no output)","is_error":false}]},"uuid":"3d611aef-b404-4fbb-a7f0-4855e3ce1069","timestamp":"2026-03-25T05:11:29.334Z","toolUseResult":{"stdout":"","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false},"sourceToolAssistantUUID":"4c325081-d633-49f5-9fdf-462e64aa215a","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"bef12fe0-9889-476d-9d49-a8c133a1dfae","version":"2.1.81","gitBranch":"hotfix","slug":"peaceful-jingling-lobster"} {"parentUuid":"3d611aef-b404-4fbb-a7f0-4855e3ce1069","isSidechain":false,"message":{"model":"claude-opus-4-6","id":"msg_017tq5QJTrZPGLcGLitdoaXd","type":"message","role":"assistant","content":[{"type":"text","text":"Build succeeds. 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