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You can also run the `ANALYZE` command manually.\n14\tWhile we are confident that the memory issue with the metricstore cleanup move\n15\tpolicy is fixed, it is still recommended to use delete policy for cleanup.\n16\tThis is also the default.\n17\t\n18\t## Changes in 1.5.4\n19\t\n20\t### Bug fixes\n21\t\n22\t- **Roofline legend placement**: Roofline plot legends now use fixed\n23\t  coordinates instead of dynamic placement, preventing the legend from\n24\t  overlapping data points or being rendered off-canvas (#546).\n25\t- **Subcluster usage tab labels**: Subcluster names in the status dashboard\n26\t  usage tabs are no longer force-capitalized; the original cluster-defined\n27\t  casing is preserved.\n28\t- **NodeListRow host filter**: The running-jobs query in the node list row now\n29\t  filters by exact node hostname (`eq`) instead of substring match\n30\t  (`contains`), avoiding incorrect matches when one hostname is a prefix of\n31\t  another.\n32\t\n33\t### Dependencies\n34\t\n35\t- **Go module upgrades**: Refreshed Go module dependencies to their latest\n36\t  compatible versions.\n37\t\n38\t## Changes in 1.5.3\n39\t\n40\t### Bug fixes\n41\t\n42\t- **OIDC role extraction**: Fixed role extraction from OIDC tokens where roles\n43\t  were not correctly parsed from the token claims. Roles are now always\n44\t  requested from the token regardless of other configuration.\n45\t- **OIDC user sync role changes**: `SyncUser` and `UpdateUser` callbacks now\n46\t  allow all role changes, removing a restriction that prevented role updates\n47\t  during OIDC-driven user synchronization.\n48\t- **OIDC projects array**: Projects array from the OIDC token is now submitted\n49\t  and applied when syncing user attributes.\n50\t- **WAL message drops during checkpoint**: WAL writes are now paused during\n51\t  binary checkpoint creation. Previously, disk I/O contention between\n52\t  checkpoint writes and WAL staging caused over 1.4 million dropped messages\n53\t  per checkpoint cycle.\n54\t- **WAL rotation skipped for all nodes**: `RotateWALFiles` used a non-blocking\n55\t  send on a small channel. With thousands of nodes, the channel filled instantly\n56\t  and nearly all hosts were skipped, leaving WAL files unrotated. Replaced with\n57\t  a blocking send using a shared 2-minute deadline.\n58\t- **Log viewer auto-refresh**: Fixed the log viewer component not auto-refreshing\n59\t  correctly.\n60\t- **SameSite cookie setting**: Relaxed the SameSite cookie attribute to improve\n61\t  compatibility with OIDC redirect flows.\n62\t- **WAL not rotated on partial checkpoint failure**: When binary checkpointing\n63\t  failed for some hosts, WAL files for successfully checkpointed hosts were not\n64\t  rotated and the checkpoint timestamp was not advanced. Partial successes now\n65\t  correctly advance the checkpoint and rotate WAL files for completed hosts.\n66\t- **Unbounded WAL file growth**: If binary checkpointing consistently failed for\n67\t  a host, its `current.wal` file grew without limit until disk exhaustion. A new\n68\t  `max-wal-size` configuration option (in the `checkpoints` block) allows setting\n69\t  a per-host WAL size cap in bytes. When exceeded, the WAL is force-rotated.\n70\t  Defaults to 0 (unlimited) for backward compatibility.\n71\t\n72\t- **Doubleranged filter fixes**: Range filters now correctly handle zero as a\n73\t  boundary value. Improved validation and UI text for \"more than equal\" and\n74\t  \"less than equal\" range selections.\n75\t- **Lineprotocol body parsing interrupted**: Switched from `ReadTimeout` to\n76\t  `ReadHeaderTimeout` so that long-running metric submissions are no longer\n77\t  cut off mid-stream.\n78\t- **Checkpoint archiving continues on error**: A single cluster's archiving\n79\t  failure no longer aborts the entire cleanup operation. Errors are collected\n80\t  and reported per cluster.\n81\t- **Parquet row group overflow**: Added periodic flush during checkpoint\n82\t  archiving to prevent exceeding the parquet-go 32k column-write limit.\n83\t- **Removed metrics excluded from subcluster config**: Metrics removed from a\n84\t  subcluster are no longer returned by `GetMetricConfigSubCluster`.\n85\t\n86\t### MetricStore performance\n87\t\n88\t- **WAL writer throughput**: Decoupled WAL file flushing from message processing\n89\t  using a periodic 5-second batch flush (up to 4096 messages per cycle),\n90\t  significantly increasing metric ingestion throughput.\n91\t- **Improved shutdown time**: HTTP shutdown timeout reduced; metricstore and\n92\t  archiver now shut down concurrently. Overall shutdown deadline raised to\n93\t  60 seconds.\n94\t\n95\t### New features\n96\t\n97\t- **Manual checkpoint cleanup flag**: New `-cleanup-checkpoints` CLI flag\n98\t  triggers checkpoint cleanup without starting the server, useful for\n99\t  maintenance windows or automated cleanup scripts.\n100\t- **Explicit node state queries in node view**: Node health and scheduler state\n101\t  are now fetched independently from metric data for fresher status information.\n102\t\n103\t### Development tooling\n104\t\n105\t- **Make targets for formatting and linting**: New `make fmt` and `make lint`\n106\t  targets using `gofumpt` and `golangci-lint`. Configuration added in\n107\t  `.golangci.yml` and `gopls.json`.\n108\t\n109\t### New tools\n110\t\n111\t- **binaryCheckpointReader**: New utility tool (`tools/binaryCheckpointReader`)\n112\t  that reads `.wal` or `.bin` checkpoint files produced by the metricstore\n113\t  WAL/snapshot system and dumps their contents to a human-readable `.txt` file.\n114\t  Useful for debugging and inspecting checkpoint data. Usage:\n115\t  `go run ./tools/binaryCheckpointReader <file.wal|file.bin>`\n116\t\n117\t### Logging improvements\n118\t\n119\t- **Reduced tagger log noise**: Missing metrics and expression evaluation errors\n120\t  in the job classification tagger are now logged at debug level instead of\n121\t  error level.\n122\t\n123\t## Changes in 1.5.2\n124\t\n125\t### Bug fixes\n126\t\n127\t- **Memory spike in parquet writer**: Fixed memory spikes when using the\n128\t  metricstore move (archive) policy with the parquet writer. The writer now\n129\t  processes data in a streaming fashion to avoid accumulating large allocations.\n130\t- **Top list query fixes**: Fixed top list queries in analysis and dashboard\n131\t  views.\n132\t- **Exclude down nodes from HealthCheck**: Down nodes are now excluded from\n133\t  health checks in both the REST and NATS handlers.\n134\t- **Node state priority order**: Node state determination now enforces a\n135\t  priority order. Exception: idle+down results in idle.\n136\t- **Blocking ReceiveNats call**: Fixed a blocking NATS receive call in the\n137\t  metricstore.\n138\t\n139\t### Database performance\n140\t\n141\t- **Reduced insert pressure**: Bulk insert operations (node state updates, user\n142\t  and job cache syncs) now use explicit transactions and deferred inserts,\n143\t  significantly reducing write contention on the SQLite database.\n144\t- **SyncJobs wrapped in transaction**: `SyncJobs` now runs inside a transaction\n145\t  for better consistency and reduced lock contention.\n146\t- **Configurable busy timeout**: New `busy-timeout` configuration option for the\n147\t  SQLite connection. This allows tuning how long the driver waits for a locked\n148\t  database before returning an error, which improves resilience under concurrent\n149\t  write load.\n150\t- **Increased default SQLite timeout**: The default SQLite connection timeout\n151\t  has been raised to reduce spurious timeout errors under load.\n152\t- **Optimized stats queries**: Improved sortby handling in stats queries, fixed\n153\t  cache key passing, and simplified a stats query condition that caused an\n154\t  expensive unnecessary subquery.\n155\t\n156\t### MetricStore performance\n157\t\n158\t- **Sharded WAL consumer**: The WAL consumer is now sharded for significantly\n159\t  higher write throughput.\n160\t- **NATS contention fix**: Fixed contention in the metricstore NATS ingestion\n161\t  path.\n162\t\n163\t### NATS API\n164\t\n165\t- **Nodestate health checks in NATS API**: The NATS node state handler now\n166\t  performs the same metric health checks as the REST API handler, including\n167\t  per-subcluster health checks and `MonitoringStateFailed` fallback for nodes\n168\t  without health data.\n169\t\n170\t### Logging improvements\n171\t\n172\t- **Better error context**: Several repository functions now include the calling\n173\t  function name in error messages for easier diagnosis.\n174\t- **Reduced log noise**: `ErrNoRows` (no results found) is no longer logged as\n175\t  an error in `scanRow`; common \"no rows\" paths are now silent.\n176\t- **Debug-level missing metrics**: Warning about missing metrics in the metric\n177\t  store has been downgraded to debug level to reduce log noise in normal\n178\t  operation.\n179\t- **Checkpoint archiving log**: Added an informational log message when the\n180\t  metricstore checkpoint archiving process runs.\n181\t- **Auth failure context**: Auth failure log messages now include more context\n182\t  information.\n183\t\n184\t### Behavior changes\n185\t\n186\t- **DB-based metricHealth**: Replaced heuristic-based metric health with\n187\t  DB-based metric health for the node view, providing more accurate health\n188\t  status information.\n189\t- **Removed minRunningFor filter remnants**: Cleaned up remaining `minRunningFor`\n190\t  references from the GraphQL schema and query builder.\n191\t\n192\t### Frontend\n193\t\n194\t- **Streamlined statsSeries**: Unified stats series calculation and rendering\n195\t  across plot components.\n196\t- **Clarified plot titles**: Improved titles in dashboard and health views.\n197\t- **Bumped frontend dependencies**: Updated frontend dependencies to latest\n198\t  versions.\n199\t\n200\t### Dependencies\n201\t\n202\t- **cc-lib upgraded**: Updated to latest cc-lib version.\n203\t\n204\t## Known issues\n205\t\n206\t- The new dynamic memory management is not bullet proof yet across restarts.\n207\t  Buffers that are kept outside the retention period may be lost across a\n208\t  restart. We will fix that in a subsequent patch release.\n209\t- To use the new log viewer (which is only working when starting cc-backend with\n210\t  systemd) in the admin interface the user under which the cc-backend process is\n211\t  running has to be allowed to execute the journalctl command.\n212\t- The user configuration keys for the ui have changed. Therefore old user\n213\t  configuration persisted in the database is not used anymore. It is recommended\n214\t  to configure the metrics shown in the ui-config section and remove all records\n215\t  in the table after the update.\n216\t- Currently energy footprint metrics of type energy are ignored for calculating\n217\t  total energy.\n218\t- With energy footprint metrics of type power the unit is ignored and it is\n219\t  assumed the metric has the unit Watt.\n220\t\n221\t## Changes in 1.5.1\n222\t\n223\t### Database\n224\t\n225\t- **New migration (version 11)**: Optimized database index count and added covering indexes for stats queries for significantly improved query performance\n226\t- **Migration 9 fix**: Removed redundant indices from migration 9 that are superseded by migration 11\n227\t- **Optional DB optimization flag**: Added `-optimize-db` CLI flag to run `ANALYZE` on demand; removed automatic ANALYZE on startup\n228\t- **Selective stats queries**: Stats queries are now selective, reducing unnecessary computation\n229\t- **User list paging**: Added paging support to the user list for better scalability\n230\t- **SQLite configuration hardening**: Sanitized SQLite configuration with new configurable options; fixes large heap allocations in the SQLite driver\n231\t- **Query cancellation**: Long-running database queries can now be cancelled\n232\t- **Resource leak fix**: Added missing `defer Close()` calls for all query result sets\n233\t\n234\t### Bug fixes\n235\t\n236\t- **Segfault when taggers misconfigured**: Fixed crash when `enable-job-taggers` is set but tagger rule directories are missing\n237\t- **GroupBy stats query complexity**: Reduced complexity for `groupBy` statistics queries\n238\t- **Ranged filter conditions**: Fixed GT and LT conditions in ranged filters\n239\t- **Energy filter preset**: Reduced energy filter preset to a more practical default\n240\t- **JSON validity check**: Fixed wrong field being checked for JSON validity\n241\t- **Tagger float rounding**: Fixed rounding of floats in tagger messages\n242\t- **Node view null safety**: Added null-safe checks in node view to prevent runtime errors\n243\t- **Public dashboard null safety**: Added null-safe checks in the public dashboard to prevent runtime errors\n244\t\n245\t### Frontend\n246\t\n247\t- **Bumped patch versions**: Updated frontend dependencies to latest patch versions\n248\t\n249\t### Documentation\n250\t\n251\t- **New DB config options**: Added new database configuration options to README\n252\t\n253\t---\n254\t\n255\t_The sections below document all features and changes introduced in the 1.5.0 major release, which 1.5.1 is based on._\n256\t\n257\t## Breaking changes\n258\t\n259\t### Configuration changes\n260\t\n261\t- **JSON attribute naming**: All JSON configuration attributes now use `kebab-case`\n262\t  style consistently (e.g., `api-allowed-ips` instead of `apiAllowedIPs`).\n263\t  Update your `config.json` accordingly.\n264\t- **Removed `disable-archive` option**: This obsolete configuration option has been removed.\n265\t- **Removed `clusters` config section**: The separate clusters configuration section\n266\t  has been removed. Cluster information is now derived from the job archive.\n267\t- **`apiAllowedIPs` is now optional**: If not specified, defaults to not\n268\t  restricted.\n269\t\n270\t### Architecture changes\n271\t\n272\t- **Web framework replaced**: Migrated from `gorilla/mux` to `chi` as the HTTP\n273\t  router. This should be transparent to users but affects how middleware and\n274\t  routes are composed. A proper 404 handler is now in place.\n275\t- **MetricStore moved**: The `metricstore` package has been moved from `internal/`\n276\t  to `pkg/` as it is now part of the public API.\n277\t- **MySQL/MariaDB support removed**: Only SQLite is now supported as the database backend.\n278\t- **Archive to Cleanup renaming**: Archive-related functions have been refactored\n279\t  and renamed to \"Cleanup\" for clarity.\n280\t- **`minRunningFor` filter removed**: This undocumented filter has been removed\n281\t  from the API and frontend.\n282\t\n283\t### Dependency changes\n284\t\n285\t- **cc-lib v2.8.0**: Switched to cc-lib version 2 with updated APIs\n286\t- **cclib NATS client**: Now using the cclib NATS client implementation\n287\t- Removed obsolete `util.Float` usage from cclib\n288\t\n289\t## Major new features\n290\t\n291\t### NATS API Integration\n292\t\n293\t- **Real-time job events**: Subscribe to job start/stop events via NATS\n294\t- **Node state updates**: Receive real-time node state changes via NATS\n295\t- **Configurable subjects**: NATS API subjects are now configurable via `api-subjects`\n296\t- **Deadlock fixes**: Improved NATS client stability and graceful shutdown\n297\t\n298\t### Public Dashboard\n299\t\n300\t- **Public-facing interface**: New public dashboard route for external users\n301\t- **DoubleMetricPlot component**: New visualization component for comparing metrics\n302\t- **Improved layout**: Reviewed and optimized dashboard layouts for better readability\n303\t\n304\t### Enhanced Node Management\n305\t\n306\t- **Node state tracking**: New node table in database with timestamp tracking\n307\t- **Node state filtering**: Filter jobs by node state in systems view\n308\t- **Node list enhancements**: Improved paging, filtering, and continuous scroll support\n309\t- **Nodestate retention and archiving**: Node state data is now subject to configurable\n310\t  retention policies and can be archived to Parquet format for long-term storage\n311\t- **Faulty node metric tracking**: Faulty node state metric lists are persisted to the database\n312\t\n313\t### Health Monitoring\n314\t\n315\t- **Health status dashboard**: New dedicated \"Health\" tab in the status details view\n316\t  showing per-node metric health across the cluster\n317\t- **CCMS health check**: Support for querying health status of external\n318\t  cc-metric-store (CCMS) instances via the API\n319\t- **GraphQL health endpoints**: New GraphQL queries and resolvers for health data\n320\t- **Cluster/subcluster filter**: Filter health status view by cluster or subcluster\n321\t\n322\t### Log Viewer\n323\t\n324\t- **Web-based log viewer**: New log viewer page in the admin interface for inspecting\n325\t  backend log output directly from the browser without shell access\n326\t- **Accessible from header**: Quick access link from the navigation header\n327\t\n328\t### MetricStore Improvements\n329\t\n330\t- **Memory tracking worker**: New worker for CCMS memory usage tracking\n331\t- **Dynamic retention**: Support for job specific dynamic retention times\n332\t- **Improved compression**: Transparent compression for job archive imports\n333\t- **Parallel processing**: Parallelized Iter function in all archive backends\n334\t\n335\t### Job Tagging System\n336\t\n337\t- **Job tagger option**: Enable automatic job tagging via configuration flag\n338\t- **Application detection**: Automatic detection of applications (MATLAB, GROMACS, etc.)\n339\t- **Job classification**: Automatic detection of pathological jobs\n340\t- **omit-tagged**: Option to exclude tagged jobs from retention/cleanup operations (`none`, `all`, or `user`)\n341\t- **Admin UI trigger**: Taggers can be run on-demand from the admin web interface\n342\t  without restarting the backend\n343\t\n344\t### Archive Backends\n345\t\n346\t- **Parquet archive format**: New Parquet file format for job archiving, providing\n347\t  columnar storage with efficient compression for analytical workloads\n348\t- **S3 backend**: Full support for S3-compatible object storage\n349\t- **SQLite backend**: Full support for SQLite backend using blobs\n350\t- **Performance improvements**: Fixed performance bugs in archive backends\n351\t- **Better error handling**: Improved error messages and fallback handling\n352\t- **Zstd compression**: Parquet writers use zstd compression for better\n353\t  compression ratios compared to the previous snappy default\n354\t- **Optimized sort order**: Job and nodestate Parquet files are sorted by\n355\t  cluster, subcluster, and start time for efficient range queries\n356\t\n357\t### Unified Archive Retention and Format Conversion\n358\t\n359\t- **Uniform retention policy**: Job archive retention now supports both JSON and\n360\t  Parquet as target formats under a single, consistent policy configuration\n361\t- **Archive manager tool**: The `tools/archive-manager` utility now supports\n362\t  format conversion between JSON and Parquet job archives\n363\t- **Parquet reader**: Full Parquet archive reader implementation for reading back\n364\t  archived job data\n365\t\n366\t## New features and improvements\n367\t\n368\t### Frontend\n369\t\n370\t- **Loading indicators**: Added loading indicators to status detail and job lists\n371\t- **Job info layout**: Reviewed and improved job info row layout\n372\t- **Metric selection**: Enhanced metric selection with drag-and-drop fixes\n373\t- **Filter presets**: Move list filter preset to URL for easy sharing\n374\t- **Job comparison**: Improved job comparison views and plots\n375\t- **Subcluster reactivity**: Job list now reacts to subcluster filter changes\n376\t- **Short jobs quick selection**: New \"Short jobs\" quick-filter button in job lists\n377\t  replaces the removed undocumented `minRunningFor` filter\n378\t- **Row plot cursor sync**: Cursor position is now synchronized across all metric\n379\t  plots in a job list row for easier cross-metric comparison\n380\t- **Disabled metrics handling**: Improved handling and display of disabled metrics\n381\t  across job view, node view, and list rows\n382\t- **\"Not configured\" info cards**: Informational cards shown when optional features\n383\t  are not yet configured\n384\t- **Frontend dependencies**: Bumped frontend dependencies to latest versions\n385\t- **Svelte 5 compatibility**: Fixed Svelte state warnings and compatibility issues\n386\t\n387\t### Backend\n388\t\n389\t- **Progress bars**: Import function now shows progress during long operations\n390\t- **Better logging**: Improved logging with appropriate log levels throughout\n391\t- **Graceful shutdown**: Fixed shutdown timeout bugs and hanging issues\n392\t- **Configuration defaults**: Sensible defaults for most configuration options\n393\t- **Documentation**: Extensive documentation improvements across packages\n394\t- **Server flag in systemd unit**: Example systemd unit now includes the `-server` flag\n395\t\n396\t### Security\n397\t\n398\t- **LDAP security hardening**: Improved input validation, connection handling, and\n399\t  error reporting in the LDAP authenticator\n400\t- **OIDC security hardening**: Stricter token validation and improved error handling\n401\t  in the OIDC authenticator\n402\t- **Auth schema extensions**: Additional schema fields for improved auth configuration\n403\t\n404\t### API improvements\n405\t\n406\t- **Role-based metric visibility**: Metrics can now have role-based access control\n407\t- **Job exclusivity filter**: New filter for exclusive vs. shared jobs\n408\t- **Improved error messages**: Better error messages and documentation in REST API\n409\t- **GraphQL enhancements**: Improved GraphQL queries and resolvers\n410\t- **Stop job lookup order**: Reversed lookup order in stop job requests for\n411\t  more reliable job matching (cluster+jobId first, then jobId alone)\n412\t\n413\t### Performance\n414\t\n415\t- **Database indices**: Optimized SQLite indices for better query performance\n416\t- **Job cache**: Introduced caching table for faster job inserts\n417\t- **Parallel imports**: Archive imports now run in parallel where possible\n418\t- **External tool integration**: Optimized use of external tools (fd) for better performance\n419\t- **Node repository queries**: Reviewed and optimized node repository SQL queries\n420\t- **Buffer pool**: Resized and pooled internal buffers for better memory reuse\n421\t\n422\t### Developer experience\n423\t\n424\t- **AI agent guidelines**: Added documentation for AI coding agents (AGENTS.md, CLAUDE.md)\n425\t- **Example API payloads**: Added example JSON API payloads for testing\n426\t- **Unit tests**: Added more unit tests for NATS API, node repository, and other components\n427\t- **Test improvements**: Better test coverage; test DB is now copied before unit tests\n428\t  to avoid state pollution between test runs\n429\t- **Parquet writer tests**: Comprehensive tests for Parquet archive writing and conversion\n430\t\n431\t## Bug fixes\n432\t\n433\t- Fixed nodelist paging issues\n434\t- Fixed metric select drag and drop functionality\n435\t- Fixed render race conditions in nodeList\n436\t- Fixed tag count grouping including type\n437\t- Fixed wrong metricstore schema (missing comma)\n438\t- Fixed configuration issues causing shutdown hangs\n439\t- Fixed deadlock when NATS is not configured\n440\t- Fixed archive backend performance bugs\n441\t- Fixed continuous scroll buildup on refresh\n442\t- Improved footprint calculation logic\n443\t- Fixed polar plot data query decoupling\n444\t- Fixed missing resolution parameter handling\n445\t- Fixed node table initialization fallback\n446\t- Fixed reactivity key placement in nodeList\n447\t- Fixed nodeList resolver data handling and increased nodestate filter cutoff\n448\t- Fixed job always being transferred to main job table before archiving\n449\t- Fixed AppTagger error handling and logging\n450\t- Fixed log endpoint formatting and correctness\n451\t- Fixed automatic refresh in metric status tab\n452\t- Fixed NULL value handling in `health_state` and `health_metrics` columns\n453\t- Fixed bugs related to `job_cache` IDs being used in the main job table\n454\t- Fixed SyncJobs bug causing start job hooks to be called with wrong (cache) IDs\n455\t- Fixed 404 handler route for sub-routers\n456\t\n457\t## Configuration changes\n458\t\n459\t### New configuration options\n460\t\n461\t```json\n462\t{\n463\t  \"main\": {\n464\t    \"enable-job-taggers\": true,\n465\t    \"resampling\": {\n466\t      \"minimum-points\": 600,\n467\t      \"trigger\": 180,\n468\t      \"resolutions\": [240, 60]\n469\t    },\n470\t    \"api-subjects\": {\n471\t      \"subject-job-event\": \"cc.job.event\",\n472\t      \"subject-node-state\": \"cc.node.state\"\n473\t    }\n474\t  },\n475\t  \"nats\": {\n476\t    \"address\": \"nats://0.0.0.0:4222\",\n477\t    \"username\": \"root\",\n478\t    \"password\": \"root\"\n479\t  },\n480\t  \"cron\": {\n481\t    \"commit-job-worker\": \"1m\",\n482\t    \"duration-worker\": \"5m\",\n483\t    \"footprint-worker\": \"10m\"\n484\t  },\n485\t  \"metric-store\": {\n486\t    \"cleanup\": {\n487\t      \"mode\": \"archive\",\n488\t      \"interval\": \"48h\",\n489\t      \"directory\": \"./var/archive\"\n490\t    }\n491\t  },\n492\t  \"archive\": {\n493\t    \"retention\": {\n494\t      \"policy\": \"delete\",\n495\t      \"age\": \"6months\",\n496\t      \"target-format\": \"parquet\"\n497\t    }\n498\t  },\n499\t  \"nodestate\": {\n500\t    \"retention\": {\n501\t      \"policy\": \"archive\",\n502\t      \"age\": \"30d\",\n503\t      \"archive-path\": \"./var/nodestate-archive\"\n504\t    }\n505\t  }\n506\t}\n507\t```\n508\t\n509\t## Migration notes\n510\t\n511\t- Review and update your `config.json` to use kebab-case attribute names\n512\t- If using NATS, configure the new `nats` and `api-subjects` sections\n513\t- If using S3 archive backend, configure the new `archive` section options\n514\t- Test the new public dashboard at `/public` route\n515\t- Review cron worker configuration if you need different frequencies\n516\t- If using the archive retention feature, configure the `target-format` option\n517\t  to choose between `json` (default) and `parquet` output formats\n518\t- Consider enabling nodestate retention if you track node states over time\n519\t"}]},"uuid":"31f8040c-1f01-47d0-9adc-e82820529f83","timestamp":"2026-06-04T18:15:49.530Z","toolUseResult":{"type":"text","file":{"filePath":"/Users/jan/prg/ClusterCockpit/cc-backend/ReleaseNotes.md","content":"# `cc-backend` version 1.5.4\n\nSupports job archive version 3 and database version 11.\n\nThis is a bugfix release of `cc-backend`, the API backend and frontend\nimplementation of ClusterCockpit.\nFor release specific notes visit the [ClusterCockpit Documentation](https://clusterockpit.org/docs/release/).\nIf you are upgrading from v1.5.1 no database migration is required.\nIf you are upgrading from v1.5.0 you need to do another DB migration. This\nshould not take long. For optimal database performance after the migration it is\nrecommended to apply the new `optimize-db` flag, which runs the sqlite `ANALYZE`\nand `VACUUM` commands. Depending on your database size (more then 40GB) the\n`VACUUM` may take up to 2h. You can also run the `ANALYZE` command manually.\nWhile we are confident that the memory issue with the metricstore cleanup move\npolicy is fixed, it is still recommended to use delete policy for cleanup.\nThis is also the default.\n\n## Changes in 1.5.4\n\n### Bug fixes\n\n- **Roofline legend placement**: Roofline plot legends now use fixed\n  coordinates instead of dynamic placement, preventing the legend from\n  overlapping data points or being rendered off-canvas (#546).\n- **Subcluster usage tab labels**: Subcluster names in the status dashboard\n  usage tabs are no longer force-capitalized; the original cluster-defined\n  casing is preserved.\n- **NodeListRow host filter**: The running-jobs query in the node list row now\n  filters by exact node hostname (`eq`) instead of substring match\n  (`contains`), avoiding incorrect matches when one hostname is a prefix of\n  another.\n\n### Dependencies\n\n- **Go module upgrades**: Refreshed Go module dependencies to their latest\n  compatible versions.\n\n## Changes in 1.5.3\n\n### Bug fixes\n\n- **OIDC role extraction**: Fixed role extraction from OIDC tokens where roles\n  were not correctly parsed from the token claims. Roles are now always\n  requested from the token regardless of other configuration.\n- **OIDC user sync role changes**: `SyncUser` and `UpdateUser` callbacks now\n  allow all role changes, removing a restriction that prevented role updates\n  during OIDC-driven user synchronization.\n- **OIDC projects array**: Projects array from the OIDC token is now submitted\n  and applied when syncing user attributes.\n- **WAL message drops during checkpoint**: WAL writes are now paused during\n  binary checkpoint creation. Previously, disk I/O contention between\n  checkpoint writes and WAL staging caused over 1.4 million dropped messages\n  per checkpoint cycle.\n- **WAL rotation skipped for all nodes**: `RotateWALFiles` used a non-blocking\n  send on a small channel. With thousands of nodes, the channel filled instantly\n  and nearly all hosts were skipped, leaving WAL files unrotated. Replaced with\n  a blocking send using a shared 2-minute deadline.\n- **Log viewer auto-refresh**: Fixed the log viewer component not auto-refreshing\n  correctly.\n- **SameSite cookie setting**: Relaxed the SameSite cookie attribute to improve\n  compatibility with OIDC redirect flows.\n- **WAL not rotated on partial checkpoint failure**: When binary checkpointing\n  failed for some hosts, WAL files for successfully checkpointed hosts were not\n  rotated and the checkpoint timestamp was not advanced. Partial successes now\n  correctly advance the checkpoint and rotate WAL files for completed hosts.\n- **Unbounded WAL file growth**: If binary checkpointing consistently failed for\n  a host, its `current.wal` file grew without limit until disk exhaustion. A new\n  `max-wal-size` configuration option (in the `checkpoints` block) allows setting\n  a per-host WAL size cap in bytes. When exceeded, the WAL is force-rotated.\n  Defaults to 0 (unlimited) for backward compatibility.\n\n- **Doubleranged filter fixes**: Range filters now correctly handle zero as a\n  boundary value. Improved validation and UI text for \"more than equal\" and\n  \"less than equal\" range selections.\n- **Lineprotocol body parsing interrupted**: Switched from `ReadTimeout` to\n  `ReadHeaderTimeout` so that long-running metric submissions are no longer\n  cut off mid-stream.\n- **Checkpoint archiving continues on error**: A single cluster's archiving\n  failure no longer aborts the entire cleanup operation. Errors are collected\n  and reported per cluster.\n- **Parquet row group overflow**: Added periodic flush during checkpoint\n  archiving to prevent exceeding the parquet-go 32k column-write limit.\n- **Removed metrics excluded from subcluster config**: Metrics removed from a\n  subcluster are no longer returned by `GetMetricConfigSubCluster`.\n\n### MetricStore performance\n\n- **WAL writer throughput**: Decoupled WAL file flushing from message processing\n  using a periodic 5-second batch flush (up to 4096 messages per cycle),\n  significantly increasing metric ingestion throughput.\n- **Improved shutdown time**: HTTP shutdown timeout reduced; metricstore and\n  archiver now shut down concurrently. Overall shutdown deadline raised to\n  60 seconds.\n\n### New features\n\n- **Manual checkpoint cleanup flag**: New `-cleanup-checkpoints` CLI flag\n  triggers checkpoint cleanup without starting the server, useful for\n  maintenance windows or automated cleanup scripts.\n- **Explicit node state queries in node view**: Node health and scheduler state\n  are now fetched independently from metric data for fresher status information.\n\n### Development tooling\n\n- **Make targets for formatting and linting**: New `make fmt` and `make lint`\n  targets using `gofumpt` and `golangci-lint`. Configuration added in\n  `.golangci.yml` and `gopls.json`.\n\n### New tools\n\n- **binaryCheckpointReader**: New utility tool (`tools/binaryCheckpointReader`)\n  that reads `.wal` or `.bin` checkpoint files produced by the metricstore\n  WAL/snapshot system and dumps their contents to a human-readable `.txt` file.\n  Useful for debugging and inspecting checkpoint data. Usage:\n  `go run ./tools/binaryCheckpointReader <file.wal|file.bin>`\n\n### Logging improvements\n\n- **Reduced tagger log noise**: Missing metrics and expression evaluation errors\n  in the job classification tagger are now logged at debug level instead of\n  error level.\n\n## Changes in 1.5.2\n\n### Bug fixes\n\n- **Memory spike in parquet writer**: Fixed memory spikes when using the\n  metricstore move (archive) policy with the parquet writer. The writer now\n  processes data in a streaming fashion to avoid accumulating large allocations.\n- **Top list query fixes**: Fixed top list queries in analysis and dashboard\n  views.\n- **Exclude down nodes from HealthCheck**: Down nodes are now excluded from\n  health checks in both the REST and NATS handlers.\n- **Node state priority order**: Node state determination now enforces a\n  priority order. Exception: idle+down results in idle.\n- **Blocking ReceiveNats call**: Fixed a blocking NATS receive call in the\n  metricstore.\n\n### Database performance\n\n- **Reduced insert pressure**: Bulk insert operations (node state updates, user\n  and job cache syncs) now use explicit transactions and deferred inserts,\n  significantly reducing write contention on the SQLite database.\n- **SyncJobs wrapped in transaction**: `SyncJobs` now runs inside a transaction\n  for better consistency and reduced lock contention.\n- **Configurable busy timeout**: New `busy-timeout` configuration option for the\n  SQLite connection. This allows tuning how long the driver waits for a locked\n  database before returning an error, which improves resilience under concurrent\n  write load.\n- **Increased default SQLite timeout**: The default SQLite connection timeout\n  has been raised to reduce spurious timeout errors under load.\n- **Optimized stats queries**: Improved sortby handling in stats queries, fixed\n  cache key passing, and simplified a stats query condition that caused an\n  expensive unnecessary subquery.\n\n### MetricStore performance\n\n- **Sharded WAL consumer**: The WAL consumer is now sharded for significantly\n  higher write throughput.\n- **NATS contention fix**: Fixed contention in the metricstore NATS ingestion\n  path.\n\n### NATS API\n\n- **Nodestate health checks in NATS API**: The NATS node state handler now\n  performs the same metric health checks as the REST API handler, including\n  per-subcluster health checks and `MonitoringStateFailed` fallback for nodes\n  without health data.\n\n### Logging improvements\n\n- **Better error context**: Several repository functions now include the calling\n  function name in error messages for easier diagnosis.\n- **Reduced log noise**: `ErrNoRows` (no results found) is no longer logged as\n  an error in `scanRow`; common \"no rows\" paths are now silent.\n- **Debug-level missing metrics**: Warning about missing metrics in the metric\n  store has been downgraded to debug level to reduce log noise in normal\n  operation.\n- **Checkpoint archiving log**: Added an informational log message when the\n  metricstore checkpoint archiving process runs.\n- **Auth failure context**: Auth failure log messages now include more context\n  information.\n\n### Behavior changes\n\n- **DB-based metricHealth**: Replaced heuristic-based metric health with\n  DB-based metric health for the node view, providing more accurate health\n  status information.\n- **Removed minRunningFor filter remnants**: Cleaned up remaining `minRunningFor`\n  references from the GraphQL schema and query builder.\n\n### Frontend\n\n- **Streamlined statsSeries**: Unified stats series calculation and rendering\n  across plot components.\n- **Clarified plot titles**: Improved titles in dashboard and health views.\n- **Bumped frontend dependencies**: Updated frontend dependencies to latest\n  versions.\n\n### Dependencies\n\n- **cc-lib upgraded**: Updated to latest cc-lib version.\n\n## Known issues\n\n- The new dynamic memory management is not bullet proof yet across restarts.\n  Buffers that are kept outside the retention period may be lost across a\n  restart. We will fix that in a subsequent patch release.\n- To use the new log viewer (which is only working when starting cc-backend with\n  systemd) in the admin interface the user under which the cc-backend process is\n  running has to be allowed to execute the journalctl command.\n- The user configuration keys for the ui have changed. Therefore old user\n  configuration persisted in the database is not used anymore. It is recommended\n  to configure the metrics shown in the ui-config section and remove all records\n  in the table after the update.\n- Currently energy footprint metrics of type energy are ignored for calculating\n  total energy.\n- With energy footprint metrics of type power the unit is ignored and it is\n  assumed the metric has the unit Watt.\n\n## Changes in 1.5.1\n\n### Database\n\n- **New migration (version 11)**: Optimized database index count and added covering indexes for stats queries for significantly improved query performance\n- **Migration 9 fix**: Removed redundant indices from migration 9 that are superseded by migration 11\n- **Optional DB optimization flag**: Added `-optimize-db` CLI flag to run `ANALYZE` on demand; removed automatic ANALYZE on startup\n- **Selective stats queries**: Stats queries are now selective, reducing unnecessary computation\n- **User list paging**: Added paging support to the user list for better scalability\n- **SQLite configuration hardening**: Sanitized SQLite configuration with new configurable options; fixes large heap allocations in the SQLite driver\n- **Query cancellation**: Long-running database queries can now be cancelled\n- **Resource leak fix**: Added missing `defer Close()` calls for all query result sets\n\n### Bug fixes\n\n- **Segfault when taggers misconfigured**: Fixed crash when `enable-job-taggers` is set but tagger rule directories are missing\n- **GroupBy stats query complexity**: Reduced complexity for `groupBy` statistics queries\n- **Ranged filter conditions**: Fixed GT and LT conditions in ranged filters\n- **Energy filter preset**: Reduced energy filter preset to a more practical default\n- **JSON validity check**: Fixed wrong field being checked for JSON validity\n- **Tagger float rounding**: Fixed rounding of floats in tagger messages\n- **Node view null safety**: Added null-safe checks in node view to prevent runtime errors\n- **Public dashboard null safety**: Added null-safe checks in the public dashboard to prevent runtime errors\n\n### Frontend\n\n- **Bumped patch versions**: Updated frontend dependencies to latest patch versions\n\n### Documentation\n\n- **New DB config options**: Added new database configuration options to README\n\n---\n\n_The sections below document all features and changes introduced in the 1.5.0 major release, which 1.5.1 is based on._\n\n## Breaking changes\n\n### Configuration changes\n\n- **JSON attribute naming**: All JSON configuration attributes now use `kebab-case`\n  style consistently (e.g., `api-allowed-ips` instead of `apiAllowedIPs`).\n  Update your `config.json` accordingly.\n- **Removed `disable-archive` option**: This obsolete configuration option has been removed.\n- **Removed `clusters` config section**: The separate clusters configuration section\n  has been removed. Cluster information is now derived from the job archive.\n- **`apiAllowedIPs` is now optional**: If not specified, defaults to not\n  restricted.\n\n### Architecture changes\n\n- **Web framework replaced**: Migrated from `gorilla/mux` to `chi` as the HTTP\n  router. This should be transparent to users but affects how middleware and\n  routes are composed. A proper 404 handler is now in place.\n- **MetricStore moved**: The `metricstore` package has been moved from `internal/`\n  to `pkg/` as it is now part of the public API.\n- **MySQL/MariaDB support removed**: Only SQLite is now supported as the database backend.\n- **Archive to Cleanup renaming**: Archive-related functions have been refactored\n  and renamed to \"Cleanup\" for clarity.\n- **`minRunningFor` filter removed**: This undocumented filter has been removed\n  from the API and frontend.\n\n### Dependency changes\n\n- **cc-lib v2.8.0**: Switched to cc-lib version 2 with updated APIs\n- **cclib NATS client**: Now using the cclib NATS client implementation\n- Removed obsolete `util.Float` usage from cclib\n\n## Major new features\n\n### NATS API Integration\n\n- **Real-time job events**: Subscribe to job start/stop events via NATS\n- **Node state updates**: Receive real-time node state changes via NATS\n- **Configurable subjects**: NATS API subjects are now configurable via `api-subjects`\n- **Deadlock fixes**: Improved NATS client stability and graceful shutdown\n\n### Public Dashboard\n\n- **Public-facing interface**: New public dashboard route for external users\n- **DoubleMetricPlot component**: New visualization component for comparing metrics\n- **Improved layout**: Reviewed and optimized dashboard layouts for better readability\n\n### Enhanced Node Management\n\n- **Node state tracking**: New node table in database with timestamp tracking\n- **Node state filtering**: Filter jobs by node state in systems view\n- **Node list enhancements**: Improved paging, filtering, and continuous scroll support\n- **Nodestate retention and archiving**: Node state data is now subject to configurable\n  retention policies and can be archived to Parquet format for long-term storage\n- **Faulty node metric tracking**: Faulty node state metric lists are persisted to the database\n\n### Health Monitoring\n\n- **Health status dashboard**: New dedicated \"Health\" tab in the status details view\n  showing per-node metric health across the cluster\n- **CCMS health check**: Support for querying health status of external\n  cc-metric-store (CCMS) instances via the API\n- **GraphQL health endpoints**: New GraphQL queries and resolvers for health data\n- **Cluster/subcluster filter**: Filter health status view by cluster or subcluster\n\n### Log Viewer\n\n- **Web-based log viewer**: New log viewer page in the admin interface for inspecting\n  backend log output directly from the browser without shell access\n- **Accessible from header**: Quick access link from the navigation header\n\n### MetricStore Improvements\n\n- **Memory tracking worker**: New worker for CCMS memory usage tracking\n- **Dynamic retention**: Support for job specific dynamic retention times\n- **Improved compression**: Transparent compression for job archive imports\n- **Parallel processing**: Parallelized Iter function in all archive backends\n\n### Job Tagging System\n\n- **Job tagger option**: Enable automatic job tagging via configuration flag\n- **Application detection**: Automatic detection of applications (MATLAB, GROMACS, etc.)\n- **Job classification**: Automatic detection of pathological jobs\n- **omit-tagged**: Option to exclude tagged jobs from retention/cleanup operations (`none`, `all`, or `user`)\n- **Admin UI trigger**: Taggers can be run on-demand from the admin web interface\n  without restarting the backend\n\n### Archive Backends\n\n- **Parquet archive format**: New Parquet file format for job archiving, providing\n  columnar storage with efficient compression for analytical workloads\n- **S3 backend**: Full support for S3-compatible object storage\n- **SQLite backend**: Full support for SQLite backend using blobs\n- **Performance improvements**: Fixed performance bugs in archive backends\n- **Better error handling**: Improved error messages and fallback handling\n- **Zstd compression**: Parquet writers use zstd compression for better\n  compression ratios compared to the previous snappy default\n- **Optimized sort order**: Job and nodestate Parquet files are sorted by\n  cluster, subcluster, and start time for efficient range queries\n\n### Unified Archive Retention and Format Conversion\n\n- **Uniform retention policy**: Job archive retention now supports both JSON and\n  Parquet as target formats under a single, consistent policy configuration\n- **Archive manager tool**: The `tools/archive-manager` utility now supports\n  format conversion between JSON and Parquet job archives\n- **Parquet reader**: Full Parquet archive reader implementation for reading back\n  archived job data\n\n## New features and improvements\n\n### Frontend\n\n- **Loading indicators**: Added loading indicators to status detail and job lists\n- **Job info layout**: Reviewed and improved job info row layout\n- **Metric selection**: Enhanced metric selection with drag-and-drop fixes\n- **Filter presets**: Move list filter preset to URL for easy sharing\n- **Job comparison**: Improved job comparison views and plots\n- **Subcluster reactivity**: Job list now reacts to subcluster filter changes\n- **Short jobs quick selection**: New \"Short jobs\" quick-filter button in job lists\n  replaces the removed undocumented `minRunningFor` filter\n- **Row plot cursor sync**: Cursor position is now synchronized across all metric\n  plots in a job list row for easier cross-metric comparison\n- **Disabled metrics handling**: Improved handling and display of disabled metrics\n  across job view, node view, and list rows\n- **\"Not configured\" info cards**: Informational cards shown when optional features\n  are not yet configured\n- **Frontend dependencies**: Bumped frontend dependencies to latest versions\n- **Svelte 5 compatibility**: Fixed Svelte state warnings and compatibility issues\n\n### Backend\n\n- **Progress bars**: Import function now shows progress during long operations\n- **Better logging**: Improved logging with appropriate log levels throughout\n- **Graceful shutdown**: Fixed shutdown timeout bugs and hanging issues\n- **Configuration defaults**: Sensible defaults for most configuration options\n- **Documentation**: Extensive documentation improvements across packages\n- **Server flag in systemd unit**: Example systemd unit now includes the `-server` flag\n\n### Security\n\n- **LDAP security hardening**: Improved input validation, connection handling, and\n  error reporting in the LDAP authenticator\n- **OIDC security hardening**: Stricter token validation and improved error handling\n  in the OIDC authenticator\n- **Auth schema extensions**: Additional schema fields for improved auth configuration\n\n### API improvements\n\n- **Role-based metric visibility**: Metrics can now have role-based access control\n- **Job exclusivity filter**: New filter for exclusive vs. shared jobs\n- **Improved error messages**: Better error messages and documentation in REST API\n- **GraphQL enhancements**: Improved GraphQL queries and resolvers\n- **Stop job lookup order**: Reversed lookup order in stop job requests for\n  more reliable job matching (cluster+jobId first, then jobId alone)\n\n### Performance\n\n- **Database indices**: Optimized SQLite indices for better query performance\n- **Job cache**: Introduced caching table for faster job inserts\n- **Parallel imports**: Archive imports now run in parallel where possible\n- **External tool integration**: Optimized use of external tools (fd) for better performance\n- **Node repository queries**: Reviewed and optimized node repository SQL queries\n- **Buffer pool**: Resized and pooled internal buffers for better memory reuse\n\n### Developer experience\n\n- **AI agent guidelines**: Added documentation for AI coding agents (AGENTS.md, CLAUDE.md)\n- **Example API payloads**: Added example JSON API payloads for testing\n- **Unit tests**: Added more unit tests for NATS API, node repository, and other components\n- **Test improvements**: Better test coverage; test DB is now copied before unit tests\n  to avoid state pollution between test runs\n- **Parquet writer tests**: Comprehensive tests for Parquet archive writing and conversion\n\n## Bug fixes\n\n- Fixed nodelist paging issues\n- Fixed metric select drag and drop functionality\n- Fixed render race conditions in nodeList\n- Fixed tag count grouping including type\n- Fixed wrong metricstore schema (missing comma)\n- Fixed configuration issues causing shutdown hangs\n- Fixed deadlock when NATS is not configured\n- Fixed archive backend performance bugs\n- Fixed continuous scroll buildup on refresh\n- Improved footprint calculation logic\n- Fixed polar plot data query decoupling\n- Fixed missing resolution parameter handling\n- Fixed node table initialization fallback\n- Fixed reactivity key placement in nodeList\n- Fixed nodeList resolver data handling and increased nodestate filter cutoff\n- Fixed job always being transferred to main job table before archiving\n- Fixed AppTagger error handling and logging\n- Fixed log endpoint formatting and correctness\n- Fixed automatic refresh in metric status tab\n- Fixed NULL value handling in `health_state` and `health_metrics` columns\n- Fixed bugs related to `job_cache` IDs being used in the main job table\n- Fixed SyncJobs bug causing start job hooks to be called with wrong (cache) IDs\n- Fixed 404 handler route for sub-routers\n\n## Configuration changes\n\n### New configuration options\n\n```json\n{\n  \"main\": {\n    \"enable-job-taggers\": true,\n    \"resampling\": {\n      \"minimum-points\": 600,\n      \"trigger\": 180,\n      \"resolutions\": [240, 60]\n    },\n    \"api-subjects\": {\n      \"subject-job-event\": \"cc.job.event\",\n      \"subject-node-state\": \"cc.node.state\"\n    }\n  },\n  \"nats\": {\n    \"address\": \"nats://0.0.0.0:4222\",\n    \"username\": \"root\",\n    \"password\": \"root\"\n  },\n  \"cron\": {\n    \"commit-job-worker\": \"1m\",\n    \"duration-worker\": \"5m\",\n    \"footprint-worker\": \"10m\"\n  },\n  \"metric-store\": {\n    \"cleanup\": {\n      \"mode\": \"archive\",\n      \"interval\": \"48h\",\n      \"directory\": \"./var/archive\"\n    }\n  },\n  \"archive\": {\n    \"retention\": {\n      \"policy\": \"delete\",\n      \"age\": \"6months\",\n      \"target-format\": \"parquet\"\n    }\n  },\n  \"nodestate\": {\n    \"retention\": {\n      \"policy\": \"archive\",\n      \"age\": \"30d\",\n      \"archive-path\": \"./var/nodestate-archive\"\n    }\n  }\n}\n```\n\n## Migration notes\n\n- Review and update your `config.json` to use kebab-case attribute names\n- If using NATS, configure the new `nats` and `api-subjects` sections\n- If using S3 archive backend, configure the new `archive` section options\n- Test the new public dashboard at `/public` route\n- Review cron worker configuration if you need different frequencies\n- If using the archive retention feature, configure the `target-format` option\n  to choose between `json` (default) 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+{"parentUuid":"49bb1cc6-5b98-4858-b709-92d966bb761b","isSidechain":false,"promptId":"1e650ea0-398f-4ec0-8fe3-363d74056d4a","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_014hQTg11QCk3kUYYC9FAZet","type":"tool_result","content":"1\t# NOTE\n2\t\n3\tWhile we do our best to keep the master branch in a usable state, there is no guarantee the master branch works.\n4\tPlease do not use it for production!\n5\t\n6\tPlease have a look at the [Release\n7\tNotes](https://github.com/ClusterCockpit/cc-backend/blob/master/ReleaseNotes.md)\n8\tfor breaking changes!\n9\t\n10\t# ClusterCockpit REST and GraphQL API backend\n11\t\n12\t[![Build](https://github.com/ClusterCockpit/cc-backend/actions/workflows/test.yml/badge.svg)](https://github.com/ClusterCockpit/cc-backend/actions/workflows/test.yml)\n13\t\n14\tThis is a Golang backend implementation for a REST and GraphQL API according to\n15\tthe [ClusterCockpit\n16\tspecifications](https://github.com/ClusterCockpit/cc-specifications). It also\n17\tincludes a web interface for ClusterCockpit. This implementation replaces the\n18\tprevious PHP Symfony based ClusterCockpit web interface. The reasons for\n19\tswitching from PHP Symfony to a Golang based solution are explained\n20\t[here](https://github.com/ClusterCockpit/ClusterCockpit/wiki/Why-we-switched-from-PHP-Symfony-to-a-Golang-based-solution).\n21\t\n22\t## Overview\n23\t\n24\tThis is a Golang web backend for the ClusterCockpit job-specific performance\n25\tmonitoring framework. It provides a REST API and an optional NATS-based messaging\n26\tAPI for integrating ClusterCockpit with an HPC cluster batch system and external\n27\tanalysis scripts. Data exchange between the web front-end and the back-end is\n28\tbased on a GraphQL API. The web frontend is also served by the backend using\n29\t[Svelte](https://svelte.dev/) components. Layout and styling are based on\n30\t[Bootstrap 5](https://getbootstrap.com/) using\n31\t[Bootstrap Icons](https://icons.getbootstrap.com/).\n32\t\n33\tThe backend uses [SQLite 3](https://sqlite.org/) as the relational SQL database.\n34\tWhile there are metric data backends for the InfluxDB and Prometheus time series\n35\tdatabases, the only tested and supported setup is to use cc-metric-store as the\n36\tmetric data backend. Documentation on how to integrate ClusterCockpit with other\n37\ttime series databases will be added in the future.\n38\t\n39\tFor real-time integration with HPC systems, the backend can subscribe to\n40\t[NATS](https://nats.io/) subjects to receive job start/stop events and node\n41\tstate updates, providing an alternative to REST API polling.\n42\t\n43\tCompleted batch jobs are stored in a file-based job archive according to\n44\t[this specification](https://github.com/ClusterCockpit/cc-specifications/tree/master/job-archive).\n45\tThe backend supports authentication via local accounts, an external LDAP\n46\tdirectory, and JWT tokens. Authorization for APIs is implemented with\n47\t[JWT](https://jwt.io/) tokens created with public/private key encryption.\n48\t\n49\tYou find a detailed documentation on the [ClusterCockpit\n50\tWebpage](https://clustercockpit.org).\n51\t\n52\t## Build requirements\n53\t\n54\tClusterCockpit requires a current version of the golang toolchain and node.js.\n55\tYou can check `go.mod` to see what is the current minimal golang version needed.\n56\tHomebrew and Archlinux usually have current golang versions. For other Linux\n57\tdistros this often means that you have to install the golang compiler yourself.\n58\tFortunately, this is easy with golang. Since much of the functionality is based\n59\ton the Go standard library, it is crucial for security and performance to use a\n60\tcurrent version of golang. In addition, an old golang toolchain may limit the supported\n61\tversions of third-party packages.\n62\t\n63\t## How to try ClusterCockpit with a demo setup\n64\t\n65\tWe provide a shell script that downloads demo data and automatically starts the\n66\tcc-backend. You will need `wget`, `go`, `node`, `npm` in your path to\n67\tstart the demo. The demo downloads 32MB of data (223MB on disk).\n68\t\n69\t```sh\n70\tgit clone https://github.com/ClusterCockpit/cc-backend.git\n71\tcd ./cc-backend\n72\t./startDemo.sh\n73\t```\n74\t\n75\tYou can also try the demo using the latest release binary.\n76\tCreate a folder and put the release binary `cc-backend` into this folder.\n77\tExecute the following steps:\n78\t\n79\t```shell\n80\t./cc-backend -init\n81\tvim config.json (Add a second cluster entry and name the clusters alex and fritz)\n82\twget https://hpc-mover.rrze.uni-erlangen.de/HPC-Data/0x7b58aefb/eig7ahyo6fo2bais0ephuf2aitohv1ai/job-archive-demo.tar\n83\ttar xf job-archive-demo.tar\n84\t./cc-backend -init-db -add-user demo:admin:demo -loglevel info\n85\t./cc-backend -server -dev -loglevel info\n86\t```\n87\t\n88\tYou can access the web interface at [http://localhost:8080](http://localhost:8080).\n89\tCredentials for login are `demo:demo`.\n90\tPlease note that some views do not work without a metric backend (e.g., the\n91\tAnalysis, Systems and Status views).\n92\t\n93\t## How to build and run\n94\t\n95\tThere is a Makefile to automate the build of cc-backend. The Makefile supports\n96\tthe following targets:\n97\t\n98\t- `make`: Initialize `var` directory and build svelte frontend and backend\n99\t  binary. Note that there is no proper prerequisite handling. Any change of\n100\t  frontend source files will result in a complete rebuild.\n101\t- `make clean`: Clean go build cache and remove binary.\n102\t- `make test`: Run the tests that are also run in the GitHub workflow setup.\n103\t- `make fmt`: Format all Go source files using\n104\t  [gofumpt](https://github.com/mvdan/gofumpt), a stricter superset of `gofmt`.\n105\t  Requires `gofumpt` to be installed (see below).\n106\t- `make lint`: Run [golangci-lint](https://golangci-lint.run/) with the project\n107\t  configuration in `.golangci.yml`. Requires `golangci-lint` to be installed\n108\t  (see below).\n109\t\n110\t### Installing development tools\n111\t\n112\t`gofumpt` and `golangci-lint` are not part of the Go module and must be\n113\tinstalled separately:\n114\t\n115\t```sh\n116\t# Formatter (gofumpt)\n117\tgo install mvdan.cc/gofumpt@latest\n118\t\n119\t# Linter (golangci-lint) — use the official install script to get a\n120\t# pre-built binary; installing via `go install` is not supported upstream.\n121\tcurl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/HEAD/install.sh | sh -s -- -b $(go env GOPATH)/bin\n122\t```\n123\t\n124\tA common workflow for setting up cc-backend from scratch is:\n125\t\n126\t```sh\n127\tgit clone https://github.com/ClusterCockpit/cc-backend.git\n128\t\n129\t# Build binary\n130\tcd ./cc-backend/\n131\tmake\n132\t\n133\t# EDIT THE .env FILE BEFORE YOU DEPLOY (Change the secrets)!\n134\t# If authentication is disabled, it can be empty.\n135\tcp configs/env-template.txt  .env\n136\tvim .env\n137\t\n138\tcp configs/config.json .\n139\tvim config.json\n140\t\n141\t#Optional: Link an existing job archive:\n142\tln -s <your-existing-job-archive> ./var/job-archive\n143\t\n144\t# This will first initialize the job.db database by traversing all\n145\t# `meta.json` files in the job-archive and add a new user.\n146\t./cc-backend -init-db -add-user <your-username>:admin:<your-password>\n147\t\n148\t# Start a HTTP server (HTTPS can be enabled in the configuration, the default port is 8080).\n149\t# The --dev flag enables GraphQL Playground (http://localhost:8080/playground) and Swagger UI (http://localhost:8080/swagger).\n150\t./cc-backend -server  -dev\n151\t\n152\t# Show other options:\n153\t./cc-backend -help\n154\t```\n155\t\n156\t## Database Configuration\n157\t\n158\tcc-backend uses SQLite as its database. For large installations, SQLite memory\n159\tusage can be tuned via the optional `db-config` section in config.json under\n160\t`main`:\n161\t\n162\t```json\n163\t{\n164\t  \"main\": {\n165\t    \"db\": \"./var/job.db\",\n166\t    \"db-config\": {\n167\t      \"cache-size-mb\": 2048,\n168\t      \"soft-heap-limit-mb\": 16384,\n169\t      \"max-open-connections\": 4,\n170\t      \"max-idle-connections\": 4,\n171\t      \"max-idle-time-minutes\": 10,\n172\t      \"busy-timeout-ms\": 60000\n173\t    }\n174\t  }\n175\t}\n176\t```\n177\t\n178\tAll fields are optional. If `db-config` is omitted entirely, built-in defaults\n179\tare used.\n180\t\n181\t### Options\n182\t\n183\t| Option                  | Default | Description                                                                                                                                                                             |\n184\t| ----------------------- | ------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n185\t| `cache-size-mb`         | 2048    | SQLite page cache size per connection in MB. Maps to `PRAGMA cache_size`. Total cache memory is up to `cache-size-mb × max-open-connections`.                                           |\n186\t| `soft-heap-limit-mb`    | 16384   | Process-wide SQLite soft heap limit in MB. SQLite will try to release cache pages to stay under this limit. Queries won't fail if exceeded, but cache eviction becomes more aggressive. |\n187\t| `max-open-connections`  | 4       | Maximum number of open database connections.                                                                                                                                            |\n188\t| `max-idle-connections`  | 4       | Maximum number of idle database connections kept in the pool.                                                                                                                           |\n189\t| `max-idle-time-minutes` | 10      | Maximum time in minutes a connection can sit idle before being closed.                                                                                                                  |\n190\t| `busy-timeout-ms`       | 60000   | SQLite busy timeout in milliseconds. When a write is blocked by another writer, SQLite retries internally with backoff for up to this duration before returning `SQLITE_BUSY`.          |\n191\t\n192\t### Sizing Guidelines\n193\t\n194\tSQLite's `cache_size` is a **per-connection** setting — each connection\n195\tmaintains its own independent page cache. With multiple connections, the total\n196\tmemory available for caching is the sum across all connections.\n197\t\n198\tIn practice, different connections tend to cache **different pages** (e.g., one\n199\thandles a job listing query while another runs a statistics aggregation), so\n200\ttheir caches naturally spread across the database. The formula\n201\t`DB_size / max-open-connections` gives enough per-connection cache that the\n202\tcombined caches can cover the entire database.\n203\t\n204\tHowever, this is a best-case estimate. Connections running similar queries will\n205\tcache the same pages redundantly. In the worst case (all connections caching\n206\tidentical pages), only `cache-size-mb` worth of unique data is cached rather\n207\tthan `cache-size-mb × max-open-connections`. For workloads with diverse\n208\tconcurrent queries, cache overlap is typically low.\n209\t\n210\t**Rules of thumb:**\n211\t\n212\t- **cache-size-mb**: Set to `DB_size_in_MB / max-open-connections` to allow the\n213\t  entire database to be cached in memory. For example, an 80GB database with 8\n214\t  connections needs at least 10240 MB (10GB) per connection. If your workload\n215\t  has many similar concurrent queries, consider setting it higher to account for\n216\t  cache overlap between connections.\n217\t\n218\t- **soft-heap-limit-mb**: Should be >= `cache-size-mb × max-open-connections` to\n219\t  avoid cache thrashing. This is the total SQLite memory budget for the process.\n220\t- On small installations the defaults work well. On servers with large databases\n221\t  (tens of GB) and plenty of RAM, increasing these values significantly improves\n222\t  query performance by reducing disk I/O.\n223\t\n224\t### Example: Large Server (512GB RAM, 80GB database)\n225\t\n226\t```json\n227\t{\n228\t  \"main\": {\n229\t    \"db-config\": {\n230\t      \"cache-size-mb\": 16384,\n231\t      \"soft-heap-limit-mb\": 131072,\n232\t      \"max-open-connections\": 8,\n233\t      \"max-idle-time-minutes\": 30\n234\t    }\n235\t  }\n236\t}\n237\t```\n238\t\n239\tThis allows the entire 80GB database to be cached (8 × 16GB = 128GB page cache)\n240\twith a 128GB soft heap limit, using about 25% of available RAM.\n241\t\n242\tThe effective configuration is logged at startup for verification.\n243\t\n244\t## Project file structure\n245\t\n246\t- [`.github/`](https://github.com/ClusterCockpit/cc-backend/tree/master/.github)\n247\t  GitHub Actions workflows and dependabot configuration for CI/CD.\n248\t- [`api/`](https://github.com/ClusterCockpit/cc-backend/tree/master/api)\n249\t  contains the API schema files for the REST and GraphQL APIs. The REST API is\n250\t  documented in the OpenAPI 3.0 format in\n251\t  [./api/swagger.yaml](./api/swagger.yaml). The GraphQL schema is in\n252\t  [./api/schema.graphqls](./api/schema.graphqls).\n253\t- [`cmd/cc-backend`](https://github.com/ClusterCockpit/cc-backend/tree/master/cmd/cc-backend)\n254\t  contains the main application entry point and CLI implementation.\n255\t- [`configs/`](https://github.com/ClusterCockpit/cc-backend/tree/master/configs)\n256\t  contains documentation about configuration and command line options and required\n257\t  environment variables. Sample configuration files are provided.\n258\t- [`init/`](https://github.com/ClusterCockpit/cc-backend/tree/master/init)\n259\t  contains an example of setting up systemd for production use.\n260\t- [`internal/`](https://github.com/ClusterCockpit/cc-backend/tree/master/internal)\n261\t  contains library source code that is not intended for use by others.\n262\t  - [`api`](https://github.com/ClusterCockpit/cc-backend/tree/master/internal/api)\n263\t    REST API handlers and NATS integration\n264\t  - [`archiver`](https://github.com/ClusterCockpit/cc-backend/tree/master/internal/archiver)\n265\t    Job archiving functionality\n266\t  - [`auth`](https://github.com/ClusterCockpit/cc-backend/tree/master/internal/auth)\n267\t    Authentication (local, LDAP, OIDC) and JWT token handling\n268\t  - [`config`](https://github.com/ClusterCockpit/cc-backend/tree/master/internal/config)\n269\t    Configuration management and validation\n270\t  - [`graph`](https://github.com/ClusterCockpit/cc-backend/tree/master/internal/graph)\n271\t    GraphQL schema and resolvers\n272\t  - [`importer`](https://github.com/ClusterCockpit/cc-backend/tree/master/internal/importer)\n273\t    Job data import and database initialization\n274\t  - [`metricdispatch`](https://github.com/ClusterCockpit/cc-backend/tree/master/internal/metricdispatch)\n275\t    Dispatches metric data loading to appropriate backends\n276\t  - [`repository`](https://github.com/ClusterCockpit/cc-backend/tree/master/internal/repository)\n277\t    Database repository layer for jobs and metadata\n278\t  - [`routerConfig`](https://github.com/ClusterCockpit/cc-backend/tree/master/internal/routerConfig)\n279\t    HTTP router configuration and middleware\n280\t  - [`tagger`](https://github.com/ClusterCockpit/cc-backend/tree/master/internal/tagger)\n281\t    Job classification and application detection\n282\t  - [`taskmanager`](https://github.com/ClusterCockpit/cc-backend/tree/master/internal/taskmanager)\n283\t    Background task management and scheduled jobs\n284\t  - [`metricstoreclient`](https://github.com/ClusterCockpit/cc-backend/tree/master/internal/metricstoreclient)\n285\t    Client for cc-metric-store queries\n286\t- [`pkg/`](https://github.com/ClusterCockpit/cc-backend/tree/master/pkg)\n287\t  contains Go packages that can be used by other projects.\n288\t  - [`archive`](https://github.com/ClusterCockpit/cc-backend/tree/master/pkg/archive)\n289\t    Job archive backend implementations (filesystem, S3, SQLite)\n290\t  - [`metricstore`](https://github.com/ClusterCockpit/cc-backend/tree/master/pkg/metricstore)\n291\t    In-memory metric data store with checkpointing and metric loading\n292\t- [`tools/`](https://github.com/ClusterCockpit/cc-backend/tree/master/tools)\n293\t  Additional command line helper tools.\n294\t  - [`archive-manager`](https://github.com/ClusterCockpit/cc-backend/tree/master/tools/archive-manager)\n295\t    Commands for getting infos about an existing job archive, importing jobs\n296\t    between archive backends, and converting archives between JSON and Parquet formats.\n297\t  - [`archive-migration`](https://github.com/ClusterCockpit/cc-backend/tree/master/tools/archive-migration)\n298\t    Tool for migrating job archives between formats.\n299\t  - [`convert-pem-pubkey`](https://github.com/ClusterCockpit/cc-backend/tree/master/tools/convert-pem-pubkey)\n300\t    Tool to convert external pubkey for use in `cc-backend`.\n301\t  - [`gen-keypair`](https://github.com/ClusterCockpit/cc-backend/tree/master/tools/gen-keypair)\n302\t    contains a small application to generate a compatible JWT keypair. You find\n303\t    documentation on how to use it\n304\t    [here](https://github.com/ClusterCockpit/cc-backend/blob/master/docs/JWT-Handling.md).\n305\t- [`web/`](https://github.com/ClusterCockpit/cc-backend/tree/master/web)\n306\t  Server-side templates and frontend-related files:\n307\t  - [`frontend`](https://github.com/ClusterCockpit/cc-backend/tree/master/web/frontend)\n308\t    Svelte components and static assets for the frontend UI\n309\t  - [`templates`](https://github.com/ClusterCockpit/cc-backend/tree/master/web/templates)\n310\t    Server-side Go templates, including monitoring views\n311\t- [`gqlgen.yml`](https://github.com/ClusterCockpit/cc-backend/blob/master/gqlgen.yml)\n312\t  Configures the behaviour and generation of\n313\t  [gqlgen](https://github.com/99designs/gqlgen).\n314\t- [`startDemo.sh`](https://github.com/ClusterCockpit/cc-backend/blob/master/startDemo.sh)\n315\t  is a shell script that sets up demo data, and builds and starts `cc-backend`.\n316\t"}]},"uuid":"d6a2f3e2-2c85-4489-a126-fd61a21b4471","timestamp":"2026-06-04T18:15:49.766Z","toolUseResult":{"type":"text","file":{"filePath":"/Users/jan/prg/ClusterCockpit/cc-backend/README.md","content":"# NOTE\n\nWhile we do our best to keep the master branch in a usable state, there is no guarantee the master branch works.\nPlease do not use it for production!\n\nPlease have a look at the [Release\nNotes](https://github.com/ClusterCockpit/cc-backend/blob/master/ReleaseNotes.md)\nfor breaking changes!\n\n# ClusterCockpit REST and GraphQL API backend\n\n[![Build](https://github.com/ClusterCockpit/cc-backend/actions/workflows/test.yml/badge.svg)](https://github.com/ClusterCockpit/cc-backend/actions/workflows/test.yml)\n\nThis is a Golang backend implementation for a REST and GraphQL API according to\nthe [ClusterCockpit\nspecifications](https://github.com/ClusterCockpit/cc-specifications). It also\nincludes a web interface for ClusterCockpit. This implementation replaces the\nprevious PHP Symfony based ClusterCockpit web interface. The reasons for\nswitching from PHP Symfony to a Golang based solution are explained\n[here](https://github.com/ClusterCockpit/ClusterCockpit/wiki/Why-we-switched-from-PHP-Symfony-to-a-Golang-based-solution).\n\n## Overview\n\nThis is a Golang web backend for the ClusterCockpit job-specific performance\nmonitoring framework. It provides a REST API and an optional NATS-based messaging\nAPI for integrating ClusterCockpit with an HPC cluster batch system and external\nanalysis scripts. Data exchange between the web front-end and the back-end is\nbased on a GraphQL API. The web frontend is also served by the backend using\n[Svelte](https://svelte.dev/) components. Layout and styling are based on\n[Bootstrap 5](https://getbootstrap.com/) using\n[Bootstrap Icons](https://icons.getbootstrap.com/).\n\nThe backend uses [SQLite 3](https://sqlite.org/) as the relational SQL database.\nWhile there are metric data backends for the InfluxDB and Prometheus time series\ndatabases, the only tested and supported setup is to use cc-metric-store as the\nmetric data backend. Documentation on how to integrate ClusterCockpit with other\ntime series databases will be added in the future.\n\nFor real-time integration with HPC systems, the backend can subscribe to\n[NATS](https://nats.io/) subjects to receive job start/stop events and node\nstate updates, providing an alternative to REST API polling.\n\nCompleted batch jobs are stored in a file-based job archive according to\n[this specification](https://github.com/ClusterCockpit/cc-specifications/tree/master/job-archive).\nThe backend supports authentication via local accounts, an external LDAP\ndirectory, and JWT tokens. Authorization for APIs is implemented with\n[JWT](https://jwt.io/) tokens created with public/private key encryption.\n\nYou find a detailed documentation on the [ClusterCockpit\nWebpage](https://clustercockpit.org).\n\n## Build requirements\n\nClusterCockpit requires a current version of the golang toolchain and node.js.\nYou can check `go.mod` to see what is the current minimal golang version needed.\nHomebrew and Archlinux usually have current golang versions. For other Linux\ndistros this often means that you have to install the golang compiler yourself.\nFortunately, this is easy with golang. Since much of the functionality is based\non the Go standard library, it is crucial for security and performance to use a\ncurrent version of golang. In addition, an old golang toolchain may limit the supported\nversions of third-party packages.\n\n## How to try ClusterCockpit with a demo setup\n\nWe provide a shell script that downloads demo data and automatically starts the\ncc-backend. You will need `wget`, `go`, `node`, `npm` in your path to\nstart the demo. The demo downloads 32MB of data (223MB on disk).\n\n```sh\ngit clone https://github.com/ClusterCockpit/cc-backend.git\ncd ./cc-backend\n./startDemo.sh\n```\n\nYou can also try the demo using the latest release binary.\nCreate a folder and put the release binary `cc-backend` into this folder.\nExecute the following steps:\n\n```shell\n./cc-backend -init\nvim config.json (Add a second cluster entry and name the clusters alex and fritz)\nwget https://hpc-mover.rrze.uni-erlangen.de/HPC-Data/0x7b58aefb/eig7ahyo6fo2bais0ephuf2aitohv1ai/job-archive-demo.tar\ntar xf job-archive-demo.tar\n./cc-backend -init-db -add-user demo:admin:demo -loglevel info\n./cc-backend -server -dev -loglevel info\n```\n\nYou can access the web interface at [http://localhost:8080](http://localhost:8080).\nCredentials for login are `demo:demo`.\nPlease note that some views do not work without a metric backend (e.g., the\nAnalysis, Systems and Status views).\n\n## How to build and run\n\nThere is a Makefile to automate the build of cc-backend. The Makefile supports\nthe following targets:\n\n- `make`: Initialize `var` directory and build svelte frontend and backend\n  binary. Note that there is no proper prerequisite handling. Any change of\n  frontend source files will result in a complete rebuild.\n- `make clean`: Clean go build cache and remove binary.\n- `make test`: Run the tests that are also run in the GitHub workflow setup.\n- `make fmt`: Format all Go source files using\n  [gofumpt](https://github.com/mvdan/gofumpt), a stricter superset of `gofmt`.\n  Requires `gofumpt` to be installed (see below).\n- `make lint`: Run [golangci-lint](https://golangci-lint.run/) with the project\n  configuration in `.golangci.yml`. Requires `golangci-lint` to be installed\n  (see below).\n\n### Installing development tools\n\n`gofumpt` and `golangci-lint` are not part of the Go module and must be\ninstalled separately:\n\n```sh\n# Formatter (gofumpt)\ngo install mvdan.cc/gofumpt@latest\n\n# Linter (golangci-lint) — use the official install script to get a\n# pre-built binary; installing via `go install` is not supported upstream.\ncurl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/HEAD/install.sh | sh -s -- -b $(go env GOPATH)/bin\n```\n\nA common workflow for setting up cc-backend from scratch is:\n\n```sh\ngit clone https://github.com/ClusterCockpit/cc-backend.git\n\n# Build binary\ncd ./cc-backend/\nmake\n\n# EDIT THE .env FILE BEFORE YOU DEPLOY (Change the secrets)!\n# If authentication is disabled, it can be empty.\ncp configs/env-template.txt  .env\nvim .env\n\ncp configs/config.json .\nvim config.json\n\n#Optional: Link an existing job archive:\nln -s <your-existing-job-archive> ./var/job-archive\n\n# This will first initialize the job.db database by traversing all\n# `meta.json` files in the job-archive and add a new user.\n./cc-backend -init-db -add-user <your-username>:admin:<your-password>\n\n# Start a HTTP server (HTTPS can be enabled in the configuration, the default port is 8080).\n# The --dev flag enables GraphQL Playground (http://localhost:8080/playground) and Swagger UI (http://localhost:8080/swagger).\n./cc-backend -server  -dev\n\n# Show other options:\n./cc-backend -help\n```\n\n## Database Configuration\n\ncc-backend uses SQLite as its database. For large installations, SQLite memory\nusage can be tuned via the optional `db-config` section in config.json under\n`main`:\n\n```json\n{\n  \"main\": {\n    \"db\": \"./var/job.db\",\n    \"db-config\": {\n      \"cache-size-mb\": 2048,\n      \"soft-heap-limit-mb\": 16384,\n      \"max-open-connections\": 4,\n      \"max-idle-connections\": 4,\n      \"max-idle-time-minutes\": 10,\n      \"busy-timeout-ms\": 60000\n    }\n  }\n}\n```\n\nAll fields are optional. If `db-config` is omitted entirely, built-in defaults\nare used.\n\n### Options\n\n| Option                  | Default | Description                                                                                                                                                                             |\n| ----------------------- | ------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| `cache-size-mb`         | 2048    | SQLite page cache size per connection in MB. Maps to `PRAGMA cache_size`. Total cache memory is up to `cache-size-mb × max-open-connections`.                                           |\n| `soft-heap-limit-mb`    | 16384   | Process-wide SQLite soft heap limit in MB. SQLite will try to release cache pages to stay under this limit. Queries won't fail if exceeded, but cache eviction becomes more aggressive. |\n| `max-open-connections`  | 4       | Maximum number of open database connections.                                                                                                                                            |\n| `max-idle-connections`  | 4       | Maximum number of idle database connections kept in the pool.                                                                                                                           |\n| `max-idle-time-minutes` | 10      | Maximum time in minutes a connection can sit idle before being closed.                                                                                                                  |\n| `busy-timeout-ms`       | 60000   | SQLite busy timeout in milliseconds. When a write is blocked by another writer, SQLite retries internally with backoff for up to this duration before returning `SQLITE_BUSY`.          |\n\n### Sizing Guidelines\n\nSQLite's `cache_size` is a **per-connection** setting — each connection\nmaintains its own independent page cache. With multiple connections, the total\nmemory available for caching is the sum across all connections.\n\nIn practice, different connections tend to cache **different pages** (e.g., one\nhandles a job listing query while another runs a statistics aggregation), so\ntheir caches naturally spread across the database. The formula\n`DB_size / max-open-connections` gives enough per-connection cache that the\ncombined caches can cover the entire database.\n\nHowever, this is a best-case estimate. Connections running similar queries will\ncache the same pages redundantly. In the worst case (all connections caching\nidentical pages), only `cache-size-mb` worth of unique data is cached rather\nthan `cache-size-mb × max-open-connections`. For workloads with diverse\nconcurrent queries, cache overlap is typically low.\n\n**Rules of thumb:**\n\n- **cache-size-mb**: Set to `DB_size_in_MB / max-open-connections` to allow the\n  entire database to be cached in memory. For example, an 80GB database with 8\n  connections needs at least 10240 MB (10GB) per connection. If your workload\n  has many similar concurrent queries, consider setting it higher to account for\n  cache overlap between connections.\n\n- **soft-heap-limit-mb**: Should be >= `cache-size-mb × max-open-connections` to\n  avoid cache thrashing. This is the total SQLite memory budget for the process.\n- On small installations the defaults work well. On servers with large databases\n  (tens of GB) and plenty of RAM, increasing these values significantly improves\n  query performance by reducing disk I/O.\n\n### Example: Large Server (512GB RAM, 80GB database)\n\n```json\n{\n  \"main\": {\n    \"db-config\": {\n      \"cache-size-mb\": 16384,\n      \"soft-heap-limit-mb\": 131072,\n      \"max-open-connections\": 8,\n      \"max-idle-time-minutes\": 30\n    }\n  }\n}\n```\n\nThis allows the entire 80GB database to be cached (8 × 16GB = 128GB page cache)\nwith a 128GB soft heap limit, using about 25% of available RAM.\n\nThe effective configuration is logged at startup for verification.\n\n## Project file structure\n\n- [`.github/`](https://github.com/ClusterCockpit/cc-backend/tree/master/.github)\n  GitHub Actions workflows and dependabot configuration for CI/CD.\n- [`api/`](https://github.com/ClusterCockpit/cc-backend/tree/master/api)\n  contains the API schema files for the REST and GraphQL APIs. The REST API is\n  documented in the OpenAPI 3.0 format in\n  [./api/swagger.yaml](./api/swagger.yaml). The GraphQL schema is in\n  [./api/schema.graphqls](./api/schema.graphqls).\n- [`cmd/cc-backend`](https://github.com/ClusterCockpit/cc-backend/tree/master/cmd/cc-backend)\n  contains the main application entry point and CLI implementation.\n- [`configs/`](https://github.com/ClusterCockpit/cc-backend/tree/master/configs)\n  contains documentation about configuration and command line options and required\n  environment variables. Sample configuration files are provided.\n- [`init/`](https://github.com/ClusterCockpit/cc-backend/tree/master/init)\n  contains an example of setting up systemd for production use.\n- [`internal/`](https://github.com/ClusterCockpit/cc-backend/tree/master/internal)\n  contains library source code that is not intended for use by others.\n  - [`api`](https://github.com/ClusterCockpit/cc-backend/tree/master/internal/api)\n    REST API handlers and NATS integration\n  - [`archiver`](https://github.com/ClusterCockpit/cc-backend/tree/master/internal/archiver)\n    Job archiving functionality\n  - [`auth`](https://github.com/ClusterCockpit/cc-backend/tree/master/internal/auth)\n    Authentication (local, LDAP, OIDC) and JWT token handling\n  - [`config`](https://github.com/ClusterCockpit/cc-backend/tree/master/internal/config)\n    Configuration management and validation\n  - [`graph`](https://github.com/ClusterCockpit/cc-backend/tree/master/internal/graph)\n    GraphQL schema and resolvers\n  - [`importer`](https://github.com/ClusterCockpit/cc-backend/tree/master/internal/importer)\n    Job data import and database initialization\n  - [`metricdispatch`](https://github.com/ClusterCockpit/cc-backend/tree/master/internal/metricdispatch)\n    Dispatches metric data loading to appropriate backends\n  - [`repository`](https://github.com/ClusterCockpit/cc-backend/tree/master/internal/repository)\n    Database repository layer for jobs and metadata\n  - [`routerConfig`](https://github.com/ClusterCockpit/cc-backend/tree/master/internal/routerConfig)\n    HTTP router configuration and middleware\n  - [`tagger`](https://github.com/ClusterCockpit/cc-backend/tree/master/internal/tagger)\n    Job classification and application detection\n  - [`taskmanager`](https://github.com/ClusterCockpit/cc-backend/tree/master/internal/taskmanager)\n    Background task management and scheduled jobs\n  - [`metricstoreclient`](https://github.com/ClusterCockpit/cc-backend/tree/master/internal/metricstoreclient)\n    Client for cc-metric-store queries\n- [`pkg/`](https://github.com/ClusterCockpit/cc-backend/tree/master/pkg)\n  contains Go packages that can be used by other projects.\n  - [`archive`](https://github.com/ClusterCockpit/cc-backend/tree/master/pkg/archive)\n    Job archive backend implementations (filesystem, S3, SQLite)\n  - [`metricstore`](https://github.com/ClusterCockpit/cc-backend/tree/master/pkg/metricstore)\n    In-memory metric data store with checkpointing and metric loading\n- [`tools/`](https://github.com/ClusterCockpit/cc-backend/tree/master/tools)\n  Additional command line helper tools.\n  - [`archive-manager`](https://github.com/ClusterCockpit/cc-backend/tree/master/tools/archive-manager)\n    Commands for getting infos about an existing job archive, importing jobs\n    between archive backends, and converting archives between JSON and Parquet formats.\n  - [`archive-migration`](https://github.com/ClusterCockpit/cc-backend/tree/master/tools/archive-migration)\n    Tool for migrating job archives between formats.\n  - [`convert-pem-pubkey`](https://github.com/ClusterCockpit/cc-backend/tree/master/tools/convert-pem-pubkey)\n    Tool to convert external pubkey for use in `cc-backend`.\n  - [`gen-keypair`](https://github.com/ClusterCockpit/cc-backend/tree/master/tools/gen-keypair)\n    contains a small application to generate a compatible JWT keypair. You find\n    documentation on how to use it\n    [here](https://github.com/ClusterCockpit/cc-backend/blob/master/docs/JWT-Handling.md).\n- [`web/`](https://github.com/ClusterCockpit/cc-backend/tree/master/web)\n  Server-side templates and frontend-related files:\n  - [`frontend`](https://github.com/ClusterCockpit/cc-backend/tree/master/web/frontend)\n    Svelte components and static assets for the frontend UI\n  - [`templates`](https://github.com/ClusterCockpit/cc-backend/tree/master/web/templates)\n    Server-side Go templates, including monitoring views\n- [`gqlgen.yml`](https://github.com/ClusterCockpit/cc-backend/blob/master/gqlgen.yml)\n  Configures the behaviour and generation of\n  [gqlgen](https://github.com/99designs/gqlgen).\n- [`startDemo.sh`](https://github.com/ClusterCockpit/cc-backend/blob/master/startDemo.sh)\n  is a shell script that sets up demo data, and builds and starts `cc-backend`.\n","numLines":316,"startLine":1,"totalLines":316}},"sourceToolAssistantUUID":"49bb1cc6-5b98-4858-b709-92d966bb761b","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"3b3454e4-6fe0-42f3-a8ec-8f5c8acf8f62","version":"2.1.162","gitBranch":"release/v1.5"}
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+{"parentUuid":"c1cffd2e-2004-4910-aa6a-d156b5f8e51f","isSidechain":false,"promptId":"1e650ea0-398f-4ec0-8fe3-363d74056d4a","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_011TSREvEM24YSiETSA5HM1P","type":"tool_result","content":"commit 16942f55a02ac3cafd3e1ab99edaa7396dc80233\nAuthor: Jan Eitzinger <jan@moebiusband.org>\nDate:   Thu Jun 4 20:08:41 2026 +0200\n\n    Fix medium-severity issues from follow-up security audit\n    \n    Addresses the remaining medium findings from the second-pass audit:\n    \n    - DoS hardening: bound GraphQL query cost with FixedComplexityLimit, and\n      reject non-positive items-per-page / page values so uint64 conversion\n      cannot underflow into an unbounded LIMIT/OFFSET. The -1 \"load all\"\n      sentinel stays valid for dashboards; REST now returns 400 for bad input.\n    \n    - Security headers: add X-Content-Type-Options, X-Frame-Options,\n      Referrer-Policy and a conservative CSP (frame-ancestors/object-src/\n      base-uri) that hardens against clickjacking and base-tag injection\n      without restricting the self-hosted SPA's inline scripts.\n    \n    - Stored XSS: render job.metaData.message as escaped text instead of\n      {@html ...} in Job.root and JobFootprint, preserving line breaks via\n      white-space: pre-wrap.\n    \n    - SQL injection hardening: parameterize the tag-scope IN list and the\n      manager project subquery in CountTags instead of interpolating\n      user.Username / user.Projects (externally sourced via OIDC/LDAP).\n    \n    - CSRF defense-in-depth: reject cross-site state-changing requests via\n      Sec-Fetch-Site, failing open for non-browser clients, on top of the\n      existing SameSite=Lax session cookie.\n    \n    Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>\n    Entire-Checkpoint: de7d47a85c7c\n\n cmd/cc-backend/server.go                           | 40 +++++++++++++++++++++-\n internal/api/job.go                                |  8 +++++\n internal/repository/jobQuery.go                    |  9 ++++-\n internal/repository/tags.go                        | 29 ++++++++++------\n web/frontend/src/Job.root.svelte                   |  2 +-\n .../src/generic/helper/JobFootprint.svelte         |  2 +-\n 6 files changed, 75 insertions(+), 15 deletions(-)","is_error":false}]},"uuid":"e9569ea9-4ba1-4da7-ac35-16704557a556","timestamp":"2026-06-04T18:15:59.957Z","toolUseResult":{"stdout":"commit 16942f55a02ac3cafd3e1ab99edaa7396dc80233\nAuthor: Jan Eitzinger <jan@moebiusband.org>\nDate:   Thu Jun 4 20:08:41 2026 +0200\n\n    Fix medium-severity issues from follow-up security audit\n    \n    Addresses the remaining medium findings from the second-pass audit:\n    \n    - DoS hardening: bound GraphQL query cost with FixedComplexityLimit, and\n      reject non-positive items-per-page / page values so uint64 conversion\n      cannot underflow into an unbounded LIMIT/OFFSET. The -1 \"load all\"\n      sentinel stays valid for dashboards; REST now returns 400 for bad input.\n    \n    - Security headers: add X-Content-Type-Options, X-Frame-Options,\n      Referrer-Policy and a conservative CSP (frame-ancestors/object-src/\n      base-uri) that hardens against clickjacking and base-tag injection\n      without restricting the self-hosted SPA's inline scripts.\n    \n    - Stored XSS: render job.metaData.message as escaped text instead of\n      {@html ...} in Job.root and JobFootprint, preserving line breaks via\n      white-space: pre-wrap.\n    \n    - SQL injection hardening: parameterize the tag-scope IN list and the\n      manager project subquery in CountTags instead of interpolating\n      user.Username / user.Projects (externally sourced via OIDC/LDAP).\n    \n    - CSRF defense-in-depth: reject cross-site state-changing requests via\n      Sec-Fetch-Site, failing open for non-browser clients, on top of the\n      existing SameSite=Lax session cookie.\n    \n    Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>\n    Entire-Checkpoint: de7d47a85c7c\n\n cmd/cc-backend/server.go                           | 40 +++++++++++++++++++++-\n internal/api/job.go                                |  8 +++++\n internal/repository/jobQuery.go                    |  9 ++++-\n internal/repository/tags.go                        | 29 ++++++++++------\n web/frontend/src/Job.root.svelte                   |  2 +-\n .../src/generic/helper/JobFootprint.svelte         |  2 +-\n 6 files changed, 75 insertions(+), 15 deletions(-)","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false},"sourceToolAssistantUUID":"c1cffd2e-2004-4910-aa6a-d156b5f8e51f","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"3b3454e4-6fe0-42f3-a8ec-8f5c8acf8f62","version":"2.1.162","gitBranch":"release/v1.5"}
+{"parentUuid":"e9569ea9-4ba1-4da7-ac35-16704557a556","isSidechain":false,"message":{"model":"claude-sonnet-4-6","id":"msg_01X6CYKFEKk7cwGnpMsMEcjX","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_01JaakmEhYjDPWCpg8dcLKob","name":"Bash","input":{"command":"git show 16942f55 --format=\"%B\" | head -80","description":"Show commit message for medium-severity security fixes"},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"stop_details":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":1310,"cache_read_input_tokens":41676,"output_tokens":164,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":1310,"ephemeral_5m_input_tokens":0},"inference_geo":"not_available","iterations":[{"input_tokens":1,"output_tokens":164,"cache_read_input_tokens":41676,"cache_creation_input_tokens":1310,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":1310},"type":"message"}],"speed":"standard"},"diagnostics":null},"requestId":"req_011CbigCSaPB3AgYY2K29gvz","type":"assistant","uuid":"7dada642-37b2-4ede-8d04-fc12371418d6","timestamp":"2026-06-04T18:16:00.327Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"3b3454e4-6fe0-42f3-a8ec-8f5c8acf8f62","version":"2.1.162","gitBranch":"release/v1.5"}
+{"parentUuid":"7dada642-37b2-4ede-8d04-fc12371418d6","isSidechain":false,"promptId":"1e650ea0-398f-4ec0-8fe3-363d74056d4a","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_01JaakmEhYjDPWCpg8dcLKob","type":"tool_result","content":"Fix medium-severity issues from follow-up security audit\n\nAddresses the remaining medium findings from the second-pass audit:\n\n- DoS hardening: bound GraphQL query cost with FixedComplexityLimit, and\n  reject non-positive items-per-page / page values so uint64 conversion\n  cannot underflow into an unbounded LIMIT/OFFSET. The -1 \"load all\"\n  sentinel stays valid for dashboards; REST now returns 400 for bad input.\n\n- Security headers: add X-Content-Type-Options, X-Frame-Options,\n  Referrer-Policy and a conservative CSP (frame-ancestors/object-src/\n  base-uri) that hardens against clickjacking and base-tag injection\n  without restricting the self-hosted SPA's inline scripts.\n\n- Stored XSS: render job.metaData.message as escaped text instead of\n  {@html ...} in Job.root and JobFootprint, preserving line breaks via\n  white-space: pre-wrap.\n\n- SQL injection hardening: parameterize the tag-scope IN list and the\n  manager project subquery in CountTags instead of interpolating\n  user.Username / user.Projects (externally sourced via OIDC/LDAP).\n\n- CSRF defense-in-depth: reject cross-site state-changing requests via\n  Sec-Fetch-Site, failing open for non-browser clients, on top of the\n  existing SameSite=Lax session cookie.\n\nCo-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>\nEntire-Checkpoint: de7d47a85c7c\n\n\ndiff --git a/cmd/cc-backend/server.go b/cmd/cc-backend/server.go\nindex 33504988..f39cd45d 100644\n--- a/cmd/cc-backend/server.go\n+++ b/cmd/cc-backend/server.go\n@@ -23,6 +23,7 @@ import (\n \n \t\"github.com/99designs/gqlgen/graphql\"\n \t\"github.com/99designs/gqlgen/graphql/handler\"\n+\t\"github.com/99designs/gqlgen/graphql/handler/extension\"\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@@ -50,6 +51,12 @@ const (\n \tenvDebug = \"DEBUG\"\n )\n \n+// maxQueryComplexity bounds the cost of a single GraphQL query to mitigate\n+// denial-of-service via deeply nested or heavily aliased queries. The default\n+// per-field cost is 1, so this leaves ample headroom for legitimate dashboard\n+// queries while rejecting pathological ones.\n+const maxQueryComplexity = 5000\n+\n // Server encapsulates the HTTP server state and dependencies\n type Server struct {\n \trouter        chi.Router\n@@ -90,6 +97,7 @@ func (s *Server) init() error {\n \t\tgenerated.NewExecutableSchema(generated.Config{Resolvers: resolver}))\n \n \tgraphQLServer.AddTransport(transport.POST{})\n+\tgraphQLServer.Use(extension.FixedComplexityLimit(maxQueryComplexity))\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@@ -136,8 +144,38 @@ func (s *Server) init() error {\n \t}))\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\th := rw.Header()\n+\t\t\th.Set(\"X-Content-Type-Options\", \"nosniff\")\n+\t\t\th.Set(\"X-Frame-Options\", \"DENY\")\n+\t\t\th.Set(\"Referrer-Policy\", \"same-origin\")\n+\t\t\t// Conservative CSP: blocks clickjacking (frame-ancestors), plugin\n+\t\t\t// content (object-src) and <base> injection (base-uri) without\n+\t\t\t// restricting scripts/styles, so it cannot break the self-hosted\n+\t\t\t// SPA which relies on inline scripts. A full script-src policy needs\n+\t\t\t// per-template nonces and should be added separately.\n+\t\t\th.Set(\"Content-Security-Policy\", \"frame-ancestors 'none'; object-src 'none'; base-uri 'self'\")\n \t\t\tif r.TLS != nil || r.Header.Get(\"X-Forwarded-Proto\") == \"https\" {\n-\t\t\t\trw.Header().Set(\"Strict-Transport-Security\", \"max-age=31536000; includeSubDomains\")\n+\t\t\t\th.Set(\"Strict-Transport-Security\", \"max-age=31536000; includeSubDomains\")","is_error":false}]},"uuid":"bd3f2cee-e59f-444a-bb62-1fb690bb0e32","timestamp":"2026-06-04T18:16:00.389Z","toolUseResult":{"stdout":"Fix medium-severity issues from follow-up security audit\n\nAddresses the remaining medium findings from the second-pass audit:\n\n- DoS hardening: bound GraphQL query cost with FixedComplexityLimit, and\n  reject non-positive items-per-page / page values so uint64 conversion\n  cannot underflow into an unbounded LIMIT/OFFSET. The -1 \"load all\"\n  sentinel stays valid for dashboards; REST now returns 400 for bad input.\n\n- Security headers: add X-Content-Type-Options, X-Frame-Options,\n  Referrer-Policy and a conservative CSP (frame-ancestors/object-src/\n  base-uri) that hardens against clickjacking and base-tag injection\n  without restricting the self-hosted SPA's inline scripts.\n\n- Stored XSS: render job.metaData.message as escaped text instead of\n  {@html ...} in Job.root and JobFootprint, preserving line breaks via\n  white-space: pre-wrap.\n\n- SQL injection hardening: parameterize the tag-scope IN list and the\n  manager project subquery in CountTags instead of interpolating\n  user.Username / user.Projects (externally sourced via OIDC/LDAP).\n\n- CSRF defense-in-depth: reject cross-site state-changing requests via\n  Sec-Fetch-Site, failing open for non-browser clients, on top of the\n  existing SameSite=Lax session cookie.\n\nCo-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>\nEntire-Checkpoint: de7d47a85c7c\n\n\ndiff --git a/cmd/cc-backend/server.go b/cmd/cc-backend/server.go\nindex 33504988..f39cd45d 100644\n--- a/cmd/cc-backend/server.go\n+++ b/cmd/cc-backend/server.go\n@@ -23,6 +23,7 @@ import (\n \n \t\"github.com/99designs/gqlgen/graphql\"\n \t\"github.com/99designs/gqlgen/graphql/handler\"\n+\t\"github.com/99designs/gqlgen/graphql/handler/extension\"\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@@ -50,6 +51,12 @@ const (\n \tenvDebug = \"DEBUG\"\n )\n \n+// maxQueryComplexity bounds the cost of a single GraphQL query to mitigate\n+// denial-of-service via deeply nested or heavily aliased queries. The default\n+// per-field cost is 1, so this leaves ample headroom for legitimate dashboard\n+// queries while rejecting pathological ones.\n+const maxQueryComplexity = 5000\n+\n // Server encapsulates the HTTP server state and dependencies\n type Server struct {\n \trouter        chi.Router\n@@ -90,6 +97,7 @@ func (s *Server) init() error {\n \t\tgenerated.NewExecutableSchema(generated.Config{Resolvers: resolver}))\n \n \tgraphQLServer.AddTransport(transport.POST{})\n+\tgraphQLServer.Use(extension.FixedComplexityLimit(maxQueryComplexity))\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@@ -136,8 +144,38 @@ func (s *Server) init() error {\n \t}))\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\th := rw.Header()\n+\t\t\th.Set(\"X-Content-Type-Options\", \"nosniff\")\n+\t\t\th.Set(\"X-Frame-Options\", \"DENY\")\n+\t\t\th.Set(\"Referrer-Policy\", \"same-origin\")\n+\t\t\t// Conservative CSP: blocks clickjacking (frame-ancestors), plugin\n+\t\t\t// content (object-src) and <base> injection (base-uri) without\n+\t\t\t// restricting scripts/styles, so it cannot break the self-hosted\n+\t\t\t// SPA which relies on inline scripts. A full script-src policy needs\n+\t\t\t// per-template nonces and should be added separately.\n+\t\t\th.Set(\"Content-Security-Policy\", \"frame-ancestors 'none'; object-src 'none'; base-uri 'self'\")\n \t\t\tif r.TLS != nil || r.Header.Get(\"X-Forwarded-Proto\") == \"https\" {\n-\t\t\t\trw.Header().Set(\"Strict-Transport-Security\", \"max-age=31536000; includeSubDomains\")\n+\t\t\t\th.Set(\"Strict-Transport-Security\", \"max-age=31536000; includeSubDomains\")","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false},"sourceToolAssistantUUID":"7dada642-37b2-4ede-8d04-fc12371418d6","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"3b3454e4-6fe0-42f3-a8ec-8f5c8acf8f62","version":"2.1.162","gitBranch":"release/v1.5"}
+{"parentUuid":"bd3f2cee-e59f-444a-bb62-1fb690bb0e32","isSidechain":false,"message":{"model":"claude-sonnet-4-6","id":"msg_01CYVhZnRyaSnLTkJebWCwSS","type":"message","role":"assistant","content":[{"type":"tool_use","id":"toolu_011Dqw9ujzFmMa998UcYrvsN","name":"Bash","input":{"command":"git show 6f7e262f --format=\"%B\" | head -60","description":"Show commit message for first security fixes"},"caller":{"type":"direct"}}],"stop_reason":"tool_use","stop_sequence":null,"stop_details":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":2086,"cache_read_input_tokens":42986,"output_tokens":93,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":2086,"ephemeral_5m_input_tokens":0},"inference_geo":"not_available","iterations":[{"input_tokens":1,"output_tokens":93,"cache_read_input_tokens":42986,"cache_creation_input_tokens":2086,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":2086},"type":"message"}],"speed":"standard"},"diagnostics":null},"requestId":"req_011CbigCezVnPh4iVSHY1yQA","type":"assistant","uuid":"51567755-c937-4f35-a530-dd8577c37489","timestamp":"2026-06-04T18:16:02.820Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"3b3454e4-6fe0-42f3-a8ec-8f5c8acf8f62","version":"2.1.162","gitBranch":"release/v1.5"}
+{"parentUuid":"51567755-c937-4f35-a530-dd8577c37489","isSidechain":false,"promptId":"1e650ea0-398f-4ec0-8fe3-363d74056d4a","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_011Dqw9ujzFmMa998UcYrvsN","type":"tool_result","content":"Fix issues after security audit\n\nEntire-Checkpoint: bc18358a9343\n\n\ndiff --git a/CLAUDE.md b/CLAUDE.md\nindex 061d056b..fe6a7aab 100644\n--- a/CLAUDE.md\n+++ b/CLAUDE.md\n@@ -314,6 +314,24 @@ job,function=stop_job event=\"{\\\"jobId\\\":123,\\\"cluster\\\":\\\"test\\\",\\\"startTime\\\":1\n - Messages are logged; no responses are sent back to publishers\n - If NATS client is unavailable, API subscriptions are skipped (logged as warning)\n \n+### Security Considerations\n+\n+**The NATS API has no application-layer authentication or authorization.** Unlike\n+the REST endpoints (which require a JWT with `RoleAPI`), the subscribers process\n+any message delivered on the configured subjects. Anyone with publish rights to\n+those subjects on the broker can:\n+\n+- Insert arbitrary jobs (potentially attributed to other users)\n+- Mark running jobs as stopped, triggering archive/finalization\n+- Overwrite node state and health metadata for any cluster\n+\n+Operators MUST restrict publish ACLs at the NATS broker (per-account or\n+per-subject permissions) so that only trusted producers — e.g. the scheduler\n+integration on a known host or service account — can publish to the configured\n+`subject-job-event` and `subject-node-state` subjects. A shared, unrestricted\n+NATS broker is not a safe deployment topology for this API. A startup warning\n+is logged when these subscriptions are enabled.\n+\n ## Development Guidelines\n \n ### Performance\ndiff --git a/cmd/cc-backend/server.go b/cmd/cc-backend/server.go\nindex 85503535..33504988 100644\n--- a/cmd/cc-backend/server.go\n+++ b/cmd/cc-backend/server.go\n@@ -129,11 +129,19 @@ func (s *Server) init() error {\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\tAllowCredentials: false,\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+\ts.router.Use(func(next http.Handler) http.Handler {\n+\t\treturn http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {\n+\t\t\tif r.TLS != nil || r.Header.Get(\"X-Forwarded-Proto\") == \"https\" {\n+\t\t\t\trw.Header().Set(\"Strict-Transport-Security\", \"max-age=31536000; includeSubDomains\")\n+\t\t\t}\n+\t\t\tnext.ServeHTTP(rw, r)\n+\t\t})\n+\t})\n \n \ts.restAPIHandle = api.New()\n \ndiff --git a/internal/api/api_test.go b/internal/api/api_test.go","is_error":false}]},"uuid":"e223720a-9518-409b-a1cd-0ba93e522dd8","timestamp":"2026-06-04T18:16:02.876Z","toolUseResult":{"stdout":"Fix issues after security audit\n\nEntire-Checkpoint: bc18358a9343\n\n\ndiff --git a/CLAUDE.md b/CLAUDE.md\nindex 061d056b..fe6a7aab 100644\n--- a/CLAUDE.md\n+++ b/CLAUDE.md\n@@ -314,6 +314,24 @@ job,function=stop_job event=\"{\\\"jobId\\\":123,\\\"cluster\\\":\\\"test\\\",\\\"startTime\\\":1\n - Messages are logged; no responses are sent back to publishers\n - If NATS client is unavailable, API subscriptions are skipped (logged as warning)\n \n+### Security Considerations\n+\n+**The NATS API has no application-layer authentication or authorization.** Unlike\n+the REST endpoints (which require a JWT with `RoleAPI`), the subscribers process\n+any message delivered on the configured subjects. Anyone with publish rights to\n+those subjects on the broker can:\n+\n+- Insert arbitrary jobs (potentially attributed to other users)\n+- Mark running jobs as stopped, triggering archive/finalization\n+- Overwrite node state and health metadata for any cluster\n+\n+Operators MUST restrict publish ACLs at the NATS broker (per-account or\n+per-subject permissions) so that only trusted producers — e.g. the scheduler\n+integration on a known host or service account — can publish to the configured\n+`subject-job-event` and `subject-node-state` subjects. A shared, unrestricted\n+NATS broker is not a safe deployment topology for this API. A startup warning\n+is logged when these subscriptions are enabled.\n+\n ## Development Guidelines\n \n ### Performance\ndiff --git a/cmd/cc-backend/server.go b/cmd/cc-backend/server.go\nindex 85503535..33504988 100644\n--- a/cmd/cc-backend/server.go\n+++ b/cmd/cc-backend/server.go\n@@ -129,11 +129,19 @@ func (s *Server) init() error {\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\tAllowCredentials: false,\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+\ts.router.Use(func(next http.Handler) http.Handler {\n+\t\treturn http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {\n+\t\t\tif r.TLS != nil || r.Header.Get(\"X-Forwarded-Proto\") == \"https\" {\n+\t\t\t\trw.Header().Set(\"Strict-Transport-Security\", \"max-age=31536000; includeSubDomains\")\n+\t\t\t}\n+\t\t\tnext.ServeHTTP(rw, r)\n+\t\t})\n+\t})\n \n \ts.restAPIHandle = api.New()\n \ndiff --git a/internal/api/api_test.go b/internal/api/api_test.go","stderr":"","interrupted":false,"isImage":false,"noOutputExpected":false},"sourceToolAssistantUUID":"51567755-c937-4f35-a530-dd8577c37489","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"3b3454e4-6fe0-42f3-a8ec-8f5c8acf8f62","version":"2.1.162","gitBranch":"release/v1.5"}
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Previously, an empty HMAC","+  key allowed unauthenticated admin token forgery because `golang-jwt` verifies","+  any HS256/HS512 signature against an empty key.","+- **SQL injection via metric names (critical)**: Metric names supplied through","+  GraphQL (`[String!]`) were interpolated raw into `json_extract` SQL expressions.","+  Names are now validated against `^[a-zA-Z0-9_]+$` in","+  `jobsMetricStatisticsHistogram` and `buildFloatJSONCondition`.","+- **Path traversal via line-protocol tags (critical)**: `cluster` and `host`","+  tags from the metric line protocol flowed unvalidated into `path.Join` for","+  checkpoint/WAL file paths, enabling arbitrary file writes outside the","+  checkpoint root via NATS (unauthenticated) or `POST /api/write`. Path-traversal","+  sequences are now rejected in `DecodeLine` before the tags become path","+  components.","+- **CORS `AllowCredentials` disabled**: CORS middleware no longer sets","+  `AllowCredentials: true`, which was incompatible with `AllowedOrigins: [\"*\"]`","+  and could enable cross-origin credential theft.","+- **HSTS header added**: `Strict-Transport-Security` is now set for all","+  HTTPS connections.","+- **Security response headers**: Added `X-Content-Type-Options: nosniff`,","+  `X-Frame-Options: DENY`, `Referrer-Policy: same-origin`, and a conservative","+  `Content-Security-Policy` (blocks `frame-ancestors`, `object-src`, `base-uri`)","+  to harden against clickjacking and base-tag injection.","+- **Stored XSS in job message**: `job.metaData.message` is now rendered as","+  escaped text (CSS `white-space: pre-wrap`) instead of raw `{@html ...}` in","+  `Job.root` and `JobFootprint`.","+- **SQL injection in tag queries**: The tag-scope `IN` list and manager project","+  subquery in `CountTags` are now parameterized instead of interpolating","+  `user.Username` / `user.Projects` values sourced from OIDC/LDAP.","+- **GraphQL DoS hardening**: Query cost is bounded with `FixedComplexityLimit`","+  (5000). Non-positive `items-per-page` and `page` values are rejected with HTTP","+  400 to prevent integer underflow into unbounded `LIMIT`/`OFFSET` queries.","+- **CSRF defense-in-depth**: State-changing requests with a cross-site","+  `Sec-Fetch-Site` header are now rejected (fails open for non-browser clients),","+  complementing the existing `SameSite=Lax` session cookie.","+- **NATS API security warning**: A startup warning is now logged when NATS","+  subscriptions are enabled, reminding operators that the NATS API has no","+  application-layer authentication and that publish ACLs must be restricted at","+  the broker.","+"," ### Bug fixes"," "," - **Roofline legend placement**: Roofline plot legends now use fixed"]}],"userModified":false,"replaceAll":false},"sourceToolAssistantUUID":"947493c7-9ad0-4b37-824d-fc114f8deb10","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"3b3454e4-6fe0-42f3-a8ec-8f5c8acf8f62","version":"2.1.162","gitBranch":"release/v1.5"}
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+{"parentUuid":"dba314c5-3414-4b4e-9fcf-6b08a3acce5f","isSidechain":false,"message":{"model":"claude-sonnet-4-6","id":"msg_015py4Urc8qJ5VjJ4PvJCfac","type":"message","role":"assistant","content":[{"type":"text","text":"The README doesn't describe NATS security in detail — that lives in CLAUDE.md (already updated by commit `6f7e262f`). The README overview paragraph is still accurate. No README changes needed.\n\nLet me do a quick sanity-check of the updated ReleaseNotes header:"}],"stop_reason":"tool_use","stop_sequence":null,"stop_details":null,"usage":{"input_tokens":1,"cache_creation_input_tokens":222,"cache_read_input_tokens":49593,"output_tokens":161,"server_tool_use":{"web_search_requests":0,"web_fetch_requests":0},"service_tier":"standard","cache_creation":{"ephemeral_1h_input_tokens":222,"ephemeral_5m_input_tokens":0},"inference_geo":"not_available","iterations":[{"input_tokens":1,"output_tokens":161,"cache_read_input_tokens":49593,"cache_creation_input_tokens":222,"cache_creation":{"ephemeral_5m_input_tokens":0,"ephemeral_1h_input_tokens":222},"type":"message"}],"speed":"standard"},"diagnostics":null},"requestId":"req_011CbigN7ArVDjhbgcsRve34","type":"assistant","uuid":"f95af683-2f6d-4b53-92db-9d33b4e4b3a3","timestamp":"2026-06-04T18:18:12.492Z","userType":"external","entrypoint":"cli","cwd":"/Users/jan/prg/ClusterCockpit/cc-backend","sessionId":"3b3454e4-6fe0-42f3-a8ec-8f5c8acf8f62","version":"2.1.162","gitBranch":"release/v1.5"}
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+{"parentUuid":"1b3a7f16-dc43-4e3d-8230-1086f2a0e672","isSidechain":false,"promptId":"bb83290e-eda5-4829-bb43-e0f49186c9e6","type":"user","message":{"role":"user","content":[{"tool_use_id":"toolu_016pagi6chTsyWZQ9aW9fmwt","type":"tool_result","content":"1\t# `cc-backend` version 1.5.4\n2\t\n3\tSupports job archive version 3 and database version 11.\n4\t\n5\tThis is a security and bugfix release of `cc-backend`, the API backend and\n6\tfrontend implementation of ClusterCockpit.\n7\tFor release specific notes visit the [ClusterCockpit Documentation](https://clusterockpit.org/docs/release/).\n8\tIf you are upgrading from v1.5.1 no database migration is required.\n9\tIf you are upgrading from v1.5.0 you need to do another DB migration. This\n10\tshould not take long. For optimal database performance after the migration it is\n11\trecommended to apply the new `optimize-db` flag, which runs the sqlite `ANALYZE`\n12\tand `VACUUM` commands. Depending on your database size (more then 40GB) the\n13\t`VACUUM` may take up to 2h. You can also run the `ANALYZE` command manually.\n14\tWhile we are confident that the memory issue with the metricstore cleanup move\n15\tpolicy is fixed, it is still recommended to use delete policy for cleanup.\n16\tThis is also the default.\n17\t\n18\t## Changes in 1.5.4\n19\t\n20\t### Security fixes\n21\t\n22\t- **JWT HMAC empty-key bypass (critical)**: `jwtSession.go` now refuses to\n23\t  register when `CROSS_LOGIN_JWT_HS512_KEY` is unset. Previously, an empty HMAC\n24\t  key allowed unauthenticated admin token forgery because `golang-jwt` verifies\n25\t  any HS256/HS512 signature against an empty key.\n26\t- **SQL injection via metric names (critical)**: Metric names supplied through\n27\t  GraphQL (`[String!]`) were interpolated raw into `json_extract` SQL expressions.\n28\t  Names are now validated against `^[a-zA-Z0-9_]+$` in\n29\t  `jobsMetricStatisticsHistogram` and `buildFloatJSONCondition`.\n30\t- **Path traversal via line-protocol tags (critical)**: `cluster` and `host`\n31\t  tags from the metric line protocol flowed unvalidated into `path.Join` for\n32\t  checkpoint/WAL file paths, enabling arbitrary file writes outside the\n33\t  checkpoint root via NATS (unauthenticated) or `POST /api/write`. Path-traversal\n34\t  sequences are now rejected in `DecodeLine` before the tags become path\n35\t  components.\n36\t- **CORS `AllowCredentials` disabled**: CORS middleware no longer sets\n37\t  `AllowCredentials: true`, which was incompatible with `AllowedOrigins: [\"*\"]`\n38\t  and could enable cross-origin credential theft.\n39\t- **HSTS header added**: `Strict-Transport-Security` is now set for all\n40\t  HTTPS connections.\n41\t- **Security response headers**: Added `X-Content-Type-Options: nosniff`,\n42\t  `X-Frame-Options: DENY`, `Referrer-Policy: same-origin`, and a conservative\n43\t  `Content-Security-Policy` (blocks `frame-ancestors`, `object-src`, `base-uri`)\n44\t  to harden against clickjacking and base-tag injection.\n45\t- **Stored XSS in job message**: `job.metaData.message` is now rendered as\n46\t  escaped text (CSS `white-space: pre-wrap`) instead of raw `{@html ...}` in\n47\t  `Job.root` and `JobFootprint`.\n48\t- **SQL injection in tag queries**: The tag-scope `IN` list and manager project\n49\t  subquery in `CountTags` are now parameterized instead of interpolating\n50\t  `user.Username` / `user.Projects` values sourced from OIDC/LDAP.\n51\t- **GraphQL DoS hardening**: Query cost is bounded with `FixedComplexityLimit`\n52\t  (5000). Non-positive `items-per-page` and `page` values are rejected with HTTP\n53\t  400 to prevent integer underflow into unbounded `LIMIT`/`OFFSET` queries.\n54\t- **CSRF defense-in-depth**: State-changing requests with a cross-site\n55\t  `Sec-Fetch-Site` header are now rejected (fails open for non-browser clients),\n56\t  complementing the existing `SameSite=Lax` session cookie.\n57\t- **NATS API security warning**: A startup warning is now logged when NATS\n58\t  subscriptions are enabled, reminding operators that the NATS API has no\n59\t  application-layer authentication and that publish ACLs must be restricted at\n60\t  the broker.\n61\t\n62\t### Bug fixes\n63\t\n64\t- **Roofline legend placement**: Roofline plot legends now use fixed\n65\t  coordinates instead of dynamic placement, preventing the legend from"}]},"uuid":"b9756613-348d-4ab2-bb44-00911617503f","timestamp":"2026-06-04T18:18:12.991Z","toolUseResult":{"type":"text","file":{"filePath":"/Users/jan/prg/ClusterCockpit/cc-backend/ReleaseNotes.md","content":"# `cc-backend` version 1.5.4\n\nSupports job archive version 3 and database version 11.\n\nThis is a security and bugfix release of `cc-backend`, the API backend and\nfrontend implementation of ClusterCockpit.\nFor release specific notes visit the [ClusterCockpit Documentation](https://clusterockpit.org/docs/release/).\nIf you are upgrading from v1.5.1 no database migration is required.\nIf you are upgrading from v1.5.0 you need to do another DB migration. This\nshould not take long. For optimal database performance after the migration it is\nrecommended to apply the new `optimize-db` flag, which runs the sqlite `ANALYZE`\nand `VACUUM` commands. Depending on your database size (more then 40GB) the\n`VACUUM` may take up to 2h. You can also run the `ANALYZE` command manually.\nWhile we are confident that the memory issue with the metricstore cleanup move\npolicy is fixed, it is still recommended to use delete policy for cleanup.\nThis is also the default.\n\n## Changes in 1.5.4\n\n### Security fixes\n\n- **JWT HMAC empty-key bypass (critical)**: `jwtSession.go` now refuses to\n  register when `CROSS_LOGIN_JWT_HS512_KEY` is unset. Previously, an empty HMAC\n  key allowed unauthenticated admin token forgery because `golang-jwt` verifies\n  any HS256/HS512 signature against an empty key.\n- **SQL injection via metric names (critical)**: Metric names supplied through\n  GraphQL (`[String!]`) were interpolated raw into `json_extract` SQL expressions.\n  Names are now validated against `^[a-zA-Z0-9_]+$` in\n  `jobsMetricStatisticsHistogram` and `buildFloatJSONCondition`.\n- **Path traversal via line-protocol tags (critical)**: `cluster` and `host`\n  tags from the metric line protocol flowed unvalidated into `path.Join` for\n  checkpoint/WAL file paths, enabling arbitrary file writes outside the\n  checkpoint root via NATS (unauthenticated) or `POST /api/write`. Path-traversal\n  sequences are now rejected in `DecodeLine` before the tags become path\n  components.\n- **CORS `AllowCredentials` disabled**: CORS middleware no longer sets\n  `AllowCredentials: true`, which was incompatible with `AllowedOrigins: [\"*\"]`\n  and could enable cross-origin credential theft.\n- **HSTS header added**: `Strict-Transport-Security` is now set for all\n  HTTPS connections.\n- **Security response headers**: Added `X-Content-Type-Options: nosniff`,\n  `X-Frame-Options: DENY`, `Referrer-Policy: same-origin`, and a conservative\n  `Content-Security-Policy` (blocks `frame-ancestors`, `object-src`, `base-uri`)\n  to harden against clickjacking and base-tag injection.\n- **Stored XSS in job message**: `job.metaData.message` is now rendered as\n  escaped text (CSS `white-space: pre-wrap`) instead of raw `{@html ...}` in\n  `Job.root` and `JobFootprint`.\n- **SQL injection in tag queries**: The tag-scope `IN` list and manager project\n  subquery in `CountTags` are now parameterized instead of interpolating\n  `user.Username` / `user.Projects` values sourced from OIDC/LDAP.\n- **GraphQL DoS hardening**: Query cost is bounded with `FixedComplexityLimit`\n  (5000). 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+
+---
+
+1.5.4 is not yet released. The version can stay there
\ No newline at end of file
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new file mode 100644
index 00000000..e3e5ff3b
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