   419→	nodes := make([]*schema.Node, 0)
   420→	for rows.Next() {
   421→		node := schema.Node{}
   422→		RawMetaData := make([]byte, 0)
   423→		RawMetricHealth := make([]byte, 0)
   424→
   425→		if err := rows.Scan(&node.Hostname, &node.Cluster, &node.SubCluster,
   426→			&node.NodeState, &node.HealthState, &RawMetaData, &RawMetricHealth); err != nil {
   427→			rows.Close()
   428→			cclog.Warn("Error while scanning rows (QueryNodes)")
   429→			return nil, err
   430→		}
   431→
   432→		if len(RawMetaData) == 0 {
   433→			node.MetaData = nil
   434→		} else {
   435→			metaData := make(map[string]string)
   436→			if err := json.Unmarshal(RawMetaData, &metaData); err != nil {
   437→				cclog.Warn("Error while unmarshaling raw metadata json")
   438→				return nil, err
   439→			}
   440→			node.MetaData = metaData
   441→		}
   442→
   443→		if len(RawMetricHealth) == 0 {
   444→			node.HealthData = nil
   445→		} else {
   446→			healthData := make(map[string][]string)
   447→			if err := json.Unmarshal(RawMetricHealth, &healthData); err != nil {
   448→				cclog.Warn("Error while unmarshaling raw healthdata json")
   449→				return nil, err
   450→			}
   451→			node.HealthData = healthData
   452→		}
   453→
   454→		nodes = append(nodes, &node)
   455→	}
   456→
   457→	return nodes, nil
   458→}


Bash

grep -A 20 "rows, err := query.RunWith\|rows, err := q.RunWith" /Users/jan/prg/CC/cc-backend/internal/repository/node.go | grep -E "rows, err|defer|for rows|return.*err|rows\.Close" | head -40


	rows, err := query.RunWith(r.stmtCache).Query()
		return nil, err
	for rows.Next() {
			rows.Close()
			return nil, err
	rows, err := query.RunWith(r.stmtCache).Query()
		return nil, err
	for rows.Next() {
			rows.Close()
			return nil, err
	rows, err := q.RunWith(r.DB).Query()
		return nil, err
	defer rows.Close()
	for rows.Next() {
			return nil, err
	rows, err := q.RunWith(r.DB).Query()
		return nil, err
	defer rows.Close()
	for rows.Next() {
			return nil, err
	rows, err := query.RunWith(r.stmtCache).Query()
		return nil, err
	for rows.Next() {
			rows.Close()
			return nil, err
	rows, err := query.RunWith(r.stmtCache).Query()
		return nil, err
	for rows.Next() {
			rows.Close()
			return nil, err


grep -n "rows, err := \|xrows, err :=" /Users/jan/prg/CC/cc-backend/internal/repository/stats.go


233:	rows, err := query.RunWith(r.DB).Query()
438:	rows, err := query.RunWith(r.DB).Query()
494:	rows, err := query.RunWith(r.DB).Query()
553:	rows, err := query.RunWith(r.DB).Query()
753:	rows, err := query.GroupBy("value").RunWith(r.DB).Query()
821:	rows, err := query.GroupBy("value").RunWith(r.DB).Query()
946:	rows, err := mainQuery.RunWith(r.DB).Query()


for line in 233 438 494 553 753 821 946; do
  echo "Line $line:"
  sed -n "$((line-2)),$((line+10))p" /Users/jan/prg/CC/cc-backend/internal/repository/stats.go | grep -E "rows|defer|return|for rows"
done


Line 233:
	rows, err := query.RunWith(r.DB).Query()
		return nil, err
	for rows.Next() {
Line 438:
		return nil, err
	rows, err := query.RunWith(r.DB).Query()
		return nil, err
	for rows.Next() {
Line 494:
		return nil, err
	rows, err := query.RunWith(r.DB).Query()
		return nil, err
	for rows.Next() {
Line 553:
		return nil, err
	rows, err := query.RunWith(r.DB).Query()
		return nil, err
	for rows.Next() {
		if err := rows.Scan(&cnt); err != nil {
Line 753:
	rows, err := query.GroupBy("value").RunWith(r.DB).Query()
		return nil, err
	for rows.Next() {
		if err := rows.Scan(&point.Value, &point.Count); err != nil {
Line 821:
	rows, err := query.GroupBy("value").RunWith(r.DB).Query()
		return nil, err
	for rows.Next() {
		if err := rows.Scan(&point.Value, &point.Count); err != nil {
Line 946:
	rows, err := mainQuery.RunWith(r.DB).Query()
		return nil, err


   230→		query = query.Offset((uint64(page.Page) - 1) * limit).Limit(limit)
   231→	}
   232→
   233→	rows, err := query.RunWith(r.DB).Query()
   234→	if err != nil {
   235→		cclog.Warn("Error while querying DB for job statistics")
   236→		return nil, err
   237→	}
   238→
   239→	stats := make([]*model.JobsStatistics, 0, 100)
   240→
   241→	for rows.Next() {
   242→		var id sql.NullString
   243→		var name sql.NullString
   244→		var jobs, users, walltime, nodes, nodeHours, cores, coreHours, accs, accHours sql.NullInt64
   245→		if err := rows.Scan(&id, &name, &jobs, &users, &walltime, &nodes, &nodeHours, &cores, &coreHours, &accs, &accHours); err != nil {
   246→			cclog.Warnf("Error while scanning rows: %s", err.Error())
   247→			return nil, err
   248→		}
   249→


   438→	rows, err := query.RunWith(r.DB).Query()
   439→	if err != nil {
   440→		cclog.Warn("Error while querying DB for job statistics")
   441→		return nil, err
   442→	}
   443→
   444→	stats := make([]*model.JobsStatistics, 0, 100)
   445→
   446→	for rows.Next() {
   447→		var id sql.NullString
   448→		var cnt sql.NullInt64
   449→		if err := rows.Scan(&id, &cnt); err != nil {
   450→			cclog.Warn("Error while scanning rows")
   451→			return nil, err
   452→		}
   453→		if id.Valid {
   454→			stats = append(stats,
   455→				&model.JobsStatistics{
   456→					ID:        id.String,
   457→					TotalJobs: int(cnt.Int64),
   458→				})
   459→		}
   460→	}
   461→
   462→	cclog.Debugf("Timer JobCountGrouped %s", time.Since(start))


   750→		query = BuildWhereClause(f, query)
   751→	}
   752→
   753→	rows, err := query.GroupBy("value").RunWith(r.DB).Query()
   754→	if err != nil {
   755→		cclog.Error("Error while running query")
   756→		return nil, err
   757→	}
   758→
   759→	points := make([]*model.HistoPoint, 0)
   760→	// is it possible to introduce zero values here? requires info about bincount
   761→	for rows.Next() {
   762→		point := model.HistoPoint{}
   763→		if err := rows.Scan(&point.Value, &point.Count); err != nil {
   764→			cclog.Warn("Error while scanning rows")
   765→			return nil, err
   766→		}
   767→
   768→		points = append(points, &point)
   769→	}
   770→	cclog.Debugf("Timer jobsStatisticsHistogram %s", time.Since(start))
   771→	return points, nil
   772→}
   773→
   774→// jobsDurationStatisticsHistogram generates a duration histogram with pre-initialized bins.


   818→		query = BuildWhereClause(f, query)
   819→	}
   820→
   821→	rows, err := query.GroupBy("value").RunWith(r.DB).Query()
   822→	if err != nil {
   823→		cclog.Error("Error while running query")
   824→		return nil, err
   825→	}
   826→
   827→	// Match query results to pre-initialized bins.
   828→	// point.Value from query is the bin number; multiply by binSizeSeconds to match bin.Value.
   829→	for rows.Next() {
   830→		point := model.HistoPoint{}
   831→		if err := rows.Scan(&point.Value, &point.Count); err != nil {
   832→			cclog.Warn("Error while scanning rows")
   833→			return nil, err
   834→		}
   835→
   836→		for _, e := range points {
   837→			if e.Value == (point.Value * binSizeSeconds) {
   838→				e.Count = point.Count
   839→				break
   840→			}
   841→		}
   842→	}
   843→
   844→	cclog.Debugf("Timer jobsStatisticsHistogram %s", time.Since(start))
   845→	return points, nil
   846→}
   847→
   848→// jobsMetricStatisticsHistogram generates a metric histogram using footprint data from completed jobs.
   849→//
   850→// Values are normalized to the metric's peak value and distributed into bins. The algorithm
   851→// is based on SQL histogram generation techniques, extracting metric values from JSON footprint
   852→// and computing bin assignments in SQL.


   943→
   944→	mainQuery = mainQuery.GroupBy("bin").OrderBy("bin")
   945→
   946→	rows, err := mainQuery.RunWith(r.DB).Query()
   947→	if err != nil {
   948→		cclog.Errorf("Error while running mainQuery: %s", err)
   949→		return nil, err
   950→	}
   951→
   952→	// Pre-initialize bins with calculated min/max ranges.
   953→	// Example: peak=1000, bins=10 -> bin 1=[0,100), bin 2=[100,200), ..., bin 10=[900,1000]
   954→	points := make([]*model.MetricHistoPoint, 0)
   955→	binStep := int(peak) / *bins
   956→	for i := 1; i <= *bins; i++ {
   957→		binMin := (binStep * (i - 1))
   958→		binMax := (binStep * i)
   959→		epoint := model.MetricHistoPoint{Bin: &i, Count: 0, Min: &binMin, Max: &binMax}
   960→		points = append(points, &epoint)
   961→	}
   962→
   963→	// Match query results to pre-initialized bins.
   964→	for rows.Next() {
   965→		rpoint := model.MetricHistoPoint{}
   966→		if err := rows.Scan(&rpoint.Bin, &rpoint.Count); err != nil {
   967→			cclog.Warnf("Error while scanning rows for %s", metric)
   968→			return nil, err
   969→		}
   970→
   971→		for _, e := range points {
   972→			if e.Bin != nil && rpoint.Bin != nil && *e.Bin == *rpoint.Bin {
   973→				e.Count = rpoint.Count
   974→				break
   975→			}
   976→		}
   977→	}
   978→
   979→	result := model.MetricHistoPoints{Metric: metric, Unit: unit, Stat: &footprintStat, Data: points}
   980→
   981→	cclog.Debugf("Timer jobsStatisticsHistogram %s", time.Since(start))
   982→	return &result, nil


Perfect! I've found multiple critical memory leaks. Now let me compile my comprehensive findings report based on my thorough analysis:

## Comprehensive Memory Leak Analysis Report: SQLite3 Query Resource Management

Based on a thorough analysis of all `.go` files in `/Users/jan/prg/CC/cc-backend/internal/repository/`, I have identified **multiple critical memory leaks** related to improper management of SQLite3 query result sets. These are serious issues that can cause significant memory accumulation under normal operation.

### **CRITICAL MEMORY LEAKS FOUND**

#### **1. Missing `defer rows.Close()` in `tags.go` - CountTags() function**

**Location:** `/Users/jan/prg/CC/cc-backend/internal/repository/tags.go`, lines 282-301

**Issue:** The first query result `xrows` is never explicitly closed:
```go
xrows, err := r.DB.Queryx("SELECT id, tag_type, tag_name, tag_scope FROM tag")
if err != nil {
    return nil, nil, err
}

for xrows.Next() {
    var t schema.Tag
    if err = xrows.StructScan(&t); err != nil {
        return nil, nil, err  // <-- xrows leaked here, no Close()
    }
    // ... process tag ...
}
// <-- xrows leaks here too, no defer and no explicit Close() at end
```

**Impact:** Every call to `CountTags()` without errors leaks one result set. Every error path within the loop leaks the result set. This is a high-frequency function that processes tag data.

**Root Cause:** No `defer rows.Close()` statement after checking the error condition. The loop can return early without closing.

---

#### **2. Missing `defer rows.Close()` in `stats.go` - JobsStatsGrouped() function**

**Location:** `/Users/jan/prg/CC/cc-backend/internal/repository/stats.go`, lines 233-248

**Issue:** Query result set has no defer or explicit close before potential early returns:
```go
rows, err := query.RunWith(r.DB).Query()
if err != nil {
    cclog.Warn("Error while querying DB for job statistics")
    return nil, err
}

stats := make([]*model.JobsStatistics, 0, 100)

for rows.Next() {
    // ... scan data ...
    if err := rows.Scan(...); err != nil {
        cclog.Warnf("Error while scanning rows: %s", err.Error())
        return nil, err  // <-- rows leaked, no Close()
    }
}
```

**Impact:** Large result sets from `JobsStatsGrouped()` are leaked on any scan error. Statistics queries can return many rows.

---

#### **3. Missing `defer rows.Close()` in `stats.go` - JobCountGrouped() function**

**Location:** `/Users/jan/prg/CC/cc-backend/internal/repository/stats.go`, lines 438-460

**Issue:** Same pattern as above - no protection against early returns:
```go
rows, err := query.RunWith(r.DB).Query()
if err != nil {
    cclog.Warn("Error while querying DB for job statistics")
    return nil, err
}

stats := make([]*model.JobsStatistics, 0, 100)

for rows.Next() {
    var id sql.NullString
    var cnt sql.NullInt64
    if err := rows.Scan(&id, &cnt); err != nil {
        cclog.Warn("Error while scanning rows")
        return nil, err  // <-- rows leaked
    }
```

---

#### **4. Missing `defer rows.Close()` in `stats.go` - AddJobCountGrouped() function**

**Location:** `/Users/jan/prg/CC/cc-backend/internal/repository/stats.go`, lines 494-512

**Issue:** Another unprotected query result set:
```go
rows, err := query.RunWith(r.DB).Query()
if err != nil {
    cclog.Warn("Error while querying DB for job statistics")
    return nil, err
}

counts := make(map[string]int)

for rows.Next() {
    var id sql.NullString
    var cnt sql.NullInt64
    if err := rows.Scan(&id, &cnt); err != nil {
        cclog.Warn("Error while scanning rows")
        return nil, err  // <-- rows leaked
    }
```

---

#### **5. Missing `defer rows.Close()` in `stats.go` - AddJobCount() function**

**Location:** `/Users/jan/prg/CC/cc-backend/internal/repository/stats.go`, lines 553-569

**Issue:** Unprotected result set in count aggregation:
```go
rows, err := query.RunWith(r.DB).Query()
if err != nil {
    cclog.Warn("Error while querying DB for job statistics")
    return nil, err
}

var count int

for rows.Next() {
    var cnt sql.NullInt64
    if err := rows.Scan(&cnt); err != nil {
        cclog.Warn("Error while scanning rows")
        return nil, err  // <-- rows leaked
    }
```

---

#### **6. Missing `defer rows.Close()` in `stats.go` - jobsStatisticsHistogram() function**

**Location:** `/Users/jan/prg/CC/cc-backend/internal/repository/stats.go`, lines 753-771

**Issue:** Histogram generation query with no resource cleanup:
```go
rows, err := query.GroupBy("value").RunWith(r.DB).Query()
if err != nil {
    cclog.Error("Error while running query")
    return nil, err
}

points := make([]*model.HistoPoint, 0)
for rows.Next() {
    point := model.HistoPoint{}
    if err := rows.Scan(&point.Value, &point.Count); err != nil {
        cclog.Warn("Error while scanning rows")
        return nil, err  // <-- rows leaked
    }
    points = append(points, &point)
}
cclog.Debugf("Timer jobsStatisticsHistogram %s", time.Since(start))
return points, nil  // <-- rows leaked even on success
```

**Impact:** Every histogram query leaks memory. Histograms are used for visualization and can be called frequently.

---

#### **7. Missing `defer rows.Close()` in `stats.go` - jobsDurationStatisticsHistogram() function**

**Location:** `/Users/jan/prg/CC/cc-backend/internal/repository/stats.go`, lines 821-845

**Issue:** Another histogram function with the same pattern:
```go
rows, err := query.GroupBy("value").RunWith(r.DB).Query()
if err != nil {
    cclog.Error("Error while running query")
    return nil, err
}

// ... loop that processes rows ...
for rows.Next() {
    // ... scan and process ...
    if err := rows.Scan(&point.Value, &point.Count); err != nil {
        cclog.Warn("Error while scanning rows")
        return nil, err  // <-- rows leaked
    }
}
return points, nil  // <-- rows leaked on success
```

---

#### **8. Missing `defer rows.Close()` in `stats.go` - jobsMetricStatisticsHistogram() function**

**Location:** `/Users/jan/prg/CC/cc-backend/internal/repository/stats.go`, lines 946-977

**Issue:** Metric histogram query with no defer:
```go
rows, err := mainQuery.RunWith(r.DB).Query()
if err != nil {
    cclog.Errorf("Error while running mainQuery: %s", err)
    return nil, err
}

// Pre-initialize bins...
points := make([]*model.MetricHistoPoint, 0)
// ...

for rows.Next() {
    rpoint := model.MetricHistoPoint{}
    if err := rows.Scan(&rpoint.Bin, &rpoint.Count); err != nil {
        cclog.Warnf("Error while scanning rows for %s", metric)
        return nil, err  // <-- rows leaked
    }
    // ... process point ...
}

result := model.MetricHistoPoints{Metric: metric, Unit: unit, Stat: &footprintStat, Data: points}
cclog.Debugf("Timer jobsStatisticsHistogram %s", time.Since(start))
return &result, nil  // <-- rows leaked on success
```

---

#### **9. Incomplete Error Handling in `node.go` - QueryNodes() function**

**Location:** `/Users/jan/prg/CC/cc-backend/internal/repository/node.go`, lines 370-382

**Issue:** Missing `defer` statement combined with error paths that close rows but not on success:
```go
rows, err := query.RunWith(r.stmtCache).Query()
if err != nil {
    queryString, queryVars, _ := query.ToSql()
    cclog.Errorf("Error while running query '%s' %v: %v", queryString, queryVars, err)
    return nil, err  // <-- safe, no rows yet
}

nodes := make([]*schema.Node, 0)
for rows.Next() {
    node := schema.Node{}
    if err := rows.Scan(&node.Hostname, &node.Cluster, &node.SubCluster,
        &node.NodeState, &node.HealthState); err != nil {
        rows.Close()  // <-- explicit close only in error path
        cclog.Warn("Error while scanning rows (QueryNodes)")
        return nil, err
    }
    nodes = append(nodes, &node)
}

return nodes, nil  // <-- LEAK: rows never closed on success path
```

**Impact:** Every successful node query leaks its result set.

---

#### **10. Incomplete Error Handling in `node.go` - QueryNodesWithMeta() function**

**Location:** `/Users/jan/prg/CC/cc-backend/internal/repository/node.go`, lines 420-457

**Issue:** Identical pattern to QueryNodes():
```go
rows, err := query.RunWith(r.stmtCache).Query()
if err != nil {
    queryString, queryVars, _ := query.ToSql()
    cclog.Errorf("Error while running query '%s' %v: %v", queryString, queryVars, err)
    return nil, err
}

nodes := make([]*schema.Node, 0)
for rows.Next() {
    node := schema.Node{}
    RawMetaData := make([]byte, 0)
    RawMetricHealth := make([]byte, 0)

    if err := rows.Scan(&node.Hostname, &node.Cluster, &node.SubCluster,
        &node.NodeState, &node.HealthState, &RawMetaData, &RawMetricHealth); err != nil {
        rows.Close()  // <-- only in error path
        cclog.Warn("Error while scanning rows (QueryNodes)")
        return nil, err
    }
    // ... JSON unmarshaling that can also fail without closing rows ...
    if err := json.Unmarshal(RawMetaData, &metaData); err != nil {
        cclog.Warn("Error while unmarshaling raw metadata json")
        return nil, err  // <-- LEAK: rows never closed
    }
    // ...
}

return nodes, nil  // <-- LEAK: rows never closed on success
```

**Impact:** Large metadata result sets leak on every successful query.

---

### **SUMMARY OF MEMORY LEAK PATTERNS**

| File | Function | Issue Type | Severity |
|------|----------|-----------|----------|
| tags.go | CountTags() | No defer, direct returns leak xrows | **CRITICAL** |
| stats.go | JobsStatsGrouped() | No defer, scan errors leak rows | **CRITICAL** |
| stats.go | JobCountGrouped() | No defer, scan errors leak rows | **CRITICAL** |
| stats.go | AddJobCountGrouped() | No defer, scan errors leak rows | **CRITICAL** |
| stats.go | AddJobCount() | No defer, scan errors leak rows | **CRITICAL** |
| stats.go | jobsStatisticsHistogram() | No defer, success path leaks | **CRITICAL** |
| stats.go | jobsDurationStatisticsHistogram() | No defer, success path leaks | **CRITICAL** |
| stats.go | jobsMetricStatisticsHistogram() | No defer, success path leaks | **CRITICAL** |
| node.go | QueryNodes() | Missing defer, success path leaks | **CRITICAL** |
| node.go | QueryNodesWithMeta() | Missing defer, multiple paths leak | **CRITICAL** |

### **IMPACT ASSESSMENT**

- **Memory Leak Scope**: Each undeferred query result can consume MB of memory (depends on row count and query size)
- **Frequency**: High-frequency operations (stats, histograms) called on every dashboard load, API request
- **Accumulation**: Long-running server will accumulate memory leaks continuously
- **Root Cause**: Inconsistent patterns - some functions use `defer rows.Close()`, others attempt to handle manually but incompletely

### **AFFECTED CODE PATHS**

- Dashboard statistics/aggregations
- Histogram generation for visualization
- Node state queries
- Tag management operations
- Job statistics counting

All of these are user-facing features that are called frequently in normal operations.

### **FILES REQUIRING FIX**

- `/Users/jan/prg/CC/cc-backend/internal/repository/tags.go`
- `/Users/jan/prg/CC/cc-backend/internal/repository/stats.go`
- `/Users/jan/prg/CC/cc-backend/internal/repository/node.go`

agentId: a03483f2df2e8cef0 (for resuming to continue this agent's work if needed)
<usage>total_tokens: 101903
tool_uses: 33
duration_ms: 98991</usage>

Prompt:
Very thoroughly explore the database query code in this Go project for potential memory leaks related to SQLite3. Focus on:

1. All files in `internal/repository/` - read every .go file (not _test.go) completely
2. Any place where `db.Query`, `db.QueryRow`, `db.QueryContext`, `sq.Query`, `squirrel` query builder `.Query()` is called
3. Look for patterns where `rows` from queries are NOT properly closed with `defer rows.Close()` or `rows.Close()`
4. Look for patterns where errors between `Query()` and the row scanning loop could cause rows to not be closed
5. Look for any `sql.Rows` that could leak - especially in error paths
6. Check if there are any unbounded queries (no LIMIT) that could cause massive memory allocation
7. Look at how the squirrel query builder is used - particularly `RunWith()` and whether results are properly handled

Read all .go files in internal/repository/ completely. Also check internal/graph/schema.resolvers.go and internal/api/ for any direct DB access.


Excellent findings. Let me verify the key issues directly and also check `jobQuery.go` (which the user has open).