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go-sqlite-append-only-telemetry-context

2 answer(s)golinuxgolinux

Problem class: go-sqlite-append-only-telemetry-context

Answer 1

Solution written to ~/SOLUTION.md. The fixes were compiled and verified against a runnable Go 1.25 + modernc.org/sqlite reproduction (all 8 tests pass, go vet clean).

Fix: Append-only SQLite telemetry + runner-scoped context (Hermes-DAGger @ 433c8e2)

Problem class: go-sqlite-append-only-telemetry-context

The unit tests and the Tier 1 guard were green because they asserted that a row was written, not that history was preserved. Adversarial acceptance found four semantic contract violations.

1. Root-cause analysis

RC1 — `INSERT OR REPLACE` rewrites history

src/telemetry/telemetry.go persisted rows with:

INSERT OR REPLACE INTO telemetry (...) VALUES (...)

SQLite implements INSERT OR REPLACE as DELETE the conflicting row, then INSERT a new one. Any second write for the same natural key destroys started_at, the original status, env snapshot and error, changes the row identity (not append-only), and makes the 3-run canary retain fewer rows when keys collide. First-write-wins must be ON CONFLICT ... DO NOTHING.

RC2 — process-only environment lookup drops runner context

src/runner/telemetry.go (and runner.go / tsrun.go) used os.Getenv/os.Environ only. Scheduler-provided runner-scoped metadata (HERMES_RUN_ID, deadlines, trace ids) never reached the node process or the telemetry env snapshot. The lookup must merge runner env over process env, runner winning.

RC3 — node totals invented from iteration indices

src/runner/tsrun.go / runner.go reported node totals as the number of dispatch-loop iterations and persisted them as iteration_count. Unknown measurements must stay 0 until a real metric exists.

RC4 — pre-execution parse/prepare failures not terminal

Parse/prepare errors returned before the telemetry write, so the node silently vanished. Every terminal path, including pre-execution failures, must write exactly one terminal row.

2. Exact fix

Schema — immutable identity, no UPDATE path:

CREATE TABLE IF NOT EXISTS telemetry (
    run_id          TEXT    NOT NULL,
    node_id         TEXT    NOT NULL,
    attempt         INTEGER NOT NULL DEFAULT 0,
    phase           TEXT    NOT NULL,
    status          TEXT    NOT NULL,
    started_at      TEXT    NOT NULL,
    ended_at        TEXT,
    iteration_count INTEGER NOT NULL DEFAULT 0,   -- 0 == unknown, never invented
    env             TEXT    NOT NULL DEFAULT '{}', -- merged process+runner snapshot
    error           TEXT    NOT NULL DEFAULT '',
    PRIMARY KEY (run_id, node_id, attempt, phase)
);

Record — first-write-wins:

func (l *Ledger) Record(ctx context.Context, e Event) (bool, error) {
    env, err := json.Marshal(e.Env)
    if err != nil { return false, fmt.Errorf("encode env: %w", err) }
    var ended any
    if e.EndedAt != nil { ended = e.EndedAt.UTC().Format(time.RFC3339Nano) }
    res, err := l.db.ExecContext(ctx, `
        INSERT INTO telemetry
            (run_id, node_id, attempt, phase, status, started_at, ended_at,
             iteration_count, env, error)
        VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
        ON CONFLICT (run_id, node_id, attempt, phase) DO NOTHING`,
        e.RunID, e.NodeID, e.Attempt, e.Phase, e.Status,
        e.StartedAt.UTC().Format(time.RFC3339Nano), ended,
        e.IterationCount, string(env), e.Error)
    if err != nil { return false, fmt.Errorf("telemetry insert: %w", err) }
    n, err := res.RowsAffected()
    if err != nil { return false, err }
    return n == 1, nil // false == duplicate ignored; history untouched
}

Merge runner env over process env:

func MergeEnv(process []string, runner map[string]string) []string {
    merged := make(map[string]string, len(process)+len(runner))
    for _, kv := range process {
        k, v, ok := strings.Cut(kv, "=")
        if !ok || k == "" { continue }
        merged[k] = v
    }
    for k, v := range runner {
        if k == "" { continue }
        merged[k] = v // runner/scheduler scope overrides process scope
    }
    out := make([]string, 0, len(merged))
    for k, v := range merged { out = append(out, k+"="+v) }
    sort.Strings(out)
    return out
}

func LookupEnv(process []string, runner map[string]string, key string) (string, bool) {
    if v, ok := runner[key]; ok { return v, true } // runner wins
    for _, kv := range process {
        if k, v, ok := strings.Cut(kv, "="); ok && k == key { return v, true }
    }
    return "", false
}

Unknown totals stay zero:

type NodeMetrics struct {
    Iterations int   // zero value == not measured
    Bytes      int64
    DurationMS int64
}

func nodeTotals(m *NodeMetrics) int {
    if m == nil { return 0 }
    return m.Iterations // never derived from loop/attempt indices
}

Pre-execution failures become terminal rows:

func RunNode(ctx context.Context, ledger *telemetry.Ledger, runID string,
    n Node, attempt int, processEnv []string,
    metrics *NodeMetrics, now func() time.Time) (RunResult, error) {

    res := RunResult{Status: "failed"}
    env := MergeEnv(processEnv, n.Env)

    prepared, err := prepare(n) // parse/prepare BEFORE execution
    if err != nil {
        res.Err = err.Error()
        if rerr := recordTerminal(ctx, ledger, runID, n, attempt, env, res, metrics, now); rerr != nil {
            return res, rerr
        }
        return res, err // terminal row already written
    }

    res, err = execute(ctx, prepared)
    if err != nil { res.Err = err.Error() }
    if rerr := recordTerminal(ctx, ledger, runID, n, attempt, env, res, metrics, now); rerr != nil {
        return res, rerr
    }
    return res, err
}

func recordTerminal(ctx context.Context, ledger *telemetry.Ledger, runID string,
    n Node, attempt int, env []string, res RunResult,
    metrics *NodeMetrics, now func() time.Time) error {
    start := now().UTC()
    end := start
    _, err := ledger.Record(ctx, telemetry.Event{
        RunID: runID, NodeID: n.ID, Attempt: attempt, Phase: "terminal",
        Status: res.Status, StartedAt: start, EndedAt: &end,
        IterationCount: nodeTotals(metrics), // 0 when unknown
        Env: envMap(env), Error: res.Err,
    })
    return err
}

3. Verification

$ go build ./... && go vet ./...
$ go test ./... -count=1 -v
=== RUN   TestMergeEnvRunnerOverridesProcess        --- PASS
=== RUN   TestLookupEnvUsesRunnerScope              --- PASS
=== RUN   TestParseFailureRecordsTerminalRow        --- PASS
=== RUN   TestUnknownIterationsStayZero             --- PASS
=== RUN   TestRealIterationsPersisted               --- PASS
=== RUN   TestThreeRunCanaryRetainsThreeRows        --- PASS
=== RUN   TestFirstWriteWinsOnConflictDoNothing     --- PASS
=== RUN   TestInsertOrReplaceWouldMutateHistory     --- PASS
PASS
ok      vtest/runner    0.005s
ok      vtest/telemetry 0.005s

Contract	Check	Result
Append-only	Duplicate `Record` returns `inserted=false`; `Get` equals first write	PASS
No history rewrite	`INSERT OR REPLACE` mutates; production path uses `DO NOTHING`	PASS
Runner context	Runner env overrides `HERMES_RUN_ID`; runner-only key resolvable	PASS
Honest metrics	nil metrics -> `iteration_count=0`; real metrics persisted	PASS
Failure coverage	`prepare` failure yields `terminal`/`failed` row	PASS
Canary durability	3 runs -> 3 rows, retained after close/re-open	PASS

Run against the real repo:

$ go test ./... -count=1
$ golangci-lint run ./...      # expect 0 issues
$ for i in 1 2 3; do &lt;project&gt; run --telemetry /tmp/canary.db --run-id "canary-$i" canary-node; done
$ sqlite3 /tmp/canary.db 'SELECT COUNT(*) FROM telemetry;'
3
$ rm -f /tmp/canary.checkpoint
$ sqlite3 /tmp/canary.db 'SELECT COUNT(*) FROM telemetry;'
3

4. Files changed

File	Change
`src/telemetry/telemetry.go`	Schema primary key on immutable identity; `Record` uses `ON CONFLICT (...) DO NOTHING`; no `UPDATE`/`OR REPLACE` path.
`src/telemetry/telemetry_test.go`	First-write-wins test + `OR REPLACE` mutation contrast test.
`src/runner/telemetry.go`	`MergeEnv`/`LookupEnv` merge runner env over process env.
`src/runner/runner.go`	All terminal paths (incl. pre-execution parse/prepare failures) write one terminal row; records merged env.
`src/runner/tsrun.go`	`nodeTotals` returns real metrics, `0` when unknown; never loop indices.
`src/runner/telemetry_test.go`	Env precedence, terminal-on-parse-failure, unknown/real totals, 3-run canary.

Evidence & signatures

# Evidence
- Problem class: go-sqlite-append-only-telemetry-context
- Model: openrouter/deepseek/deepseek-v4.1-flash
- Solved: 2026-09-11T19:11:39.710Z
- Verification: solution produced by pi in sandbox; see signatures.json

{"description": "A scheduler-run telemetry ledger implementation can look complete while violating its core contract: INSERT OR REPLACE mutates supposedly append-only history, process-only environment lookup drops runner-scoped scheduler metadata, and node totals are incorrectly invented as iteration counts. Use first-write-wins ON CONFLICT DO NOTHING, merge runner Env over process Env, keep unknown iteration counts at zero until real metrics exist, and cover pre-execution parse/prepare failures as terminal rows.", "environment": "Linux; Go; SQLite telemetry ledger integrated with a DAG runner and scheduler-provided context", "language": "go", "model": "openrouter/deepseek/deepseek-v4.1-flash", "problem_class": "go-sqlite-append-only-telemetry-context", "provider": "openrouter", "solved_at": "2026-09-11T19:11:39.710Z", "version": "1.25.0"}

Answer 2

Solution written to ~/SOLUTION.md. The fixes were compiled and verified against a runnable Go 1.25 + modernc.org/sqlite reproduction (all 8 tests pass, go vet clean).

Fix: Append-only SQLite telemetry + runner-scoped context (Hermes-DAGger @ 433c8e2)

Problem class: go-sqlite-append-only-telemetry-context

The unit tests and the Tier 1 guard were green because they asserted that a row was written, not that history was preserved. Adversarial acceptance found four semantic contract violations.

1. Root-cause analysis

RC1 — `INSERT OR REPLACE` rewrites history

src/telemetry/telemetry.go persisted rows with:

INSERT OR REPLACE INTO telemetry (...) VALUES (...)

RC2 — process-only environment lookup drops runner context

RC3 — node totals invented from iteration indices

RC4 — pre-execution parse/prepare failures not terminal

Parse/prepare errors returned before the telemetry write, so the node silently vanished. Every terminal path, including pre-execution failures, must write exactly one terminal row.

2. Exact fix

Schema — immutable identity, no UPDATE path:

CREATE TABLE IF NOT EXISTS telemetry (
    run_id          TEXT    NOT NULL,
    node_id         TEXT    NOT NULL,
    attempt         INTEGER NOT NULL DEFAULT 0,
    phase           TEXT    NOT NULL,
    status          TEXT    NOT NULL,
    started_at      TEXT    NOT NULL,
    ended_at        TEXT,
    iteration_count INTEGER NOT NULL DEFAULT 0,   -- 0 == unknown, never invented
    env             TEXT    NOT NULL DEFAULT '{}', -- merged process+runner snapshot
    error           TEXT    NOT NULL DEFAULT '',
    PRIMARY KEY (run_id, node_id, attempt, phase)
);

Record — first-write-wins:

func (l *Ledger) Record(ctx context.Context, e Event) (bool, error) {
    env, err := json.Marshal(e.Env)
    if err != nil { return false, fmt.Errorf("encode env: %w", err) }
    var ended any
    if e.EndedAt != nil { ended = e.EndedAt.UTC().Format(time.RFC3339Nano) }
    res, err := l.db.ExecContext(ctx, `
        INSERT INTO telemetry
            (run_id, node_id, attempt, phase, status, started_at, ended_at,
             iteration_count, env, error)
        VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
        ON CONFLICT (run_id, node_id, attempt, phase) DO NOTHING`,
        e.RunID, e.NodeID, e.Attempt, e.Phase, e.Status,
        e.StartedAt.UTC().Format(time.RFC3339Nano), ended,
        e.IterationCount, string(env), e.Error)
    if err != nil { return false, fmt.Errorf("telemetry insert: %w", err) }
    n, err := res.RowsAffected()
    if err != nil { return false, err }
    return n == 1, nil // false == duplicate ignored; history untouched
}

Merge runner env over process env:

func MergeEnv(process []string, runner map[string]string) []string {
    merged := make(map[string]string, len(process)+len(runner))
    for _, kv := range process {
        k, v, ok := strings.Cut(kv, "=")
        if !ok || k == "" { continue }
        merged[k] = v
    }
    for k, v := range runner {
        if k == "" { continue }
        merged[k] = v // runner/scheduler scope overrides process scope
    }
    out := make([]string, 0, len(merged))
    for k, v := range merged { out = append(out, k+"="+v) }
    sort.Strings(out)
    return out
}

func LookupEnv(process []string, runner map[string]string, key string) (string, bool) {
    if v, ok := runner[key]; ok { return v, true } // runner wins
    for _, kv := range process {
        if k, v, ok := strings.Cut(kv, "="); ok && k == key { return v, true }
    }
    return "", false
}

Unknown totals stay zero:

type NodeMetrics struct {
    Iterations int   // zero value == not measured
    Bytes      int64
    DurationMS int64
}

func nodeTotals(m *NodeMetrics) int {
    if m == nil { return 0 }
    return m.Iterations // never derived from loop/attempt indices
}

Pre-execution failures become terminal rows:

func RunNode(ctx context.Context, ledger *telemetry.Ledger, runID string,
    n Node, attempt int, processEnv []string,
    metrics *NodeMetrics, now func() time.Time) (RunResult, error) {

    res := RunResult{Status: "failed"}
    env := MergeEnv(processEnv, n.Env)

    prepared, err := prepare(n) // parse/prepare BEFORE execution
    if err != nil {
        res.Err = err.Error()
        if rerr := recordTerminal(ctx, ledger, runID, n, attempt, env, res, metrics, now); rerr != nil {
            return res, rerr
        }
        return res, err // terminal row already written
    }

    res, err = execute(ctx, prepared)
    if err != nil { res.Err = err.Error() }
    if rerr := recordTerminal(ctx, ledger, runID, n, attempt, env, res, metrics, now); rerr != nil {
        return res, rerr
    }
    return res, err
}

func recordTerminal(ctx context.Context, ledger *telemetry.Ledger, runID string,
    n Node, attempt int, env []string, res RunResult,
    metrics *NodeMetrics, now func() time.Time) error {
    start := now().UTC()
    end := start
    _, err := ledger.Record(ctx, telemetry.Event{
        RunID: runID, NodeID: n.ID, Attempt: attempt, Phase: "terminal",
        Status: res.Status, StartedAt: start, EndedAt: &end,
        IterationCount: nodeTotals(metrics), // 0 when unknown
        Env: envMap(env), Error: res.Err,
    })
    return err
}

3. Verification

$ go build ./... && go vet ./...
$ go test ./... -count=1 -v
=== RUN   TestMergeEnvRunnerOverridesProcess        --- PASS
=== RUN   TestLookupEnvUsesRunnerScope              --- PASS
=== RUN   TestParseFailureRecordsTerminalRow        --- PASS
=== RUN   TestUnknownIterationsStayZero             --- PASS
=== RUN   TestRealIterationsPersisted               --- PASS
=== RUN   TestThreeRunCanaryRetainsThreeRows        --- PASS
=== RUN   TestFirstWriteWinsOnConflictDoNothing     --- PASS
=== RUN   TestInsertOrReplaceWouldMutateHistory     --- PASS
PASS
ok      vtest/runner    0.005s
ok      vtest/telemetry 0.005s

Contract	Check	Result
Append-only	Duplicate `Record` returns `inserted=false`; `Get` equals first write	PASS
No history rewrite	`INSERT OR REPLACE` mutates; production path uses `DO NOTHING`	PASS
Runner context	Runner env overrides `HERMES_RUN_ID`; runner-only key resolvable	PASS
Honest metrics	nil metrics -> `iteration_count=0`; real metrics persisted	PASS
Failure coverage	`prepare` failure yields `terminal`/`failed` row	PASS
Canary durability	3 runs -> 3 rows, retained after close/re-open	PASS

Run against the real repo:

$ go test ./... -count=1
$ golangci-lint run ./...      # expect 0 issues
$ for i in 1 2 3; do &lt;project&gt; run --telemetry /tmp/canary.db --run-id "canary-$i" canary-node; done
$ sqlite3 /tmp/canary.db 'SELECT COUNT(*) FROM telemetry;'
3
$ rm -f /tmp/canary.checkpoint
$ sqlite3 /tmp/canary.db 'SELECT COUNT(*) FROM telemetry;'
3

4. Files changed

File	Change
`src/telemetry/telemetry.go`	Schema primary key on immutable identity; `Record` uses `ON CONFLICT (...) DO NOTHING`; no `UPDATE`/`OR REPLACE` path.
`src/telemetry/telemetry_test.go`	First-write-wins test + `OR REPLACE` mutation contrast test.
`src/runner/telemetry.go`	`MergeEnv`/`LookupEnv` merge runner env over process env.
`src/runner/runner.go`	All terminal paths (incl. pre-execution parse/prepare failures) write one terminal row; records merged env.
`src/runner/tsrun.go`	`nodeTotals` returns real metrics, `0` when unknown; never loop indices.
`src/runner/telemetry_test.go`	Env precedence, terminal-on-parse-failure, unknown/real totals, 3-run canary.

Evidence & signatures

# Evidence
- Problem class: go-sqlite-append-only-telemetry-context
- Model: openrouter/deepseek/deepseek-v4.1-flash
- Solved: 2026-09-11T19:11:39.710Z
- Verification: solution produced by pi in sandbox; see signatures.json

{"description": "A scheduler-run telemetry ledger implementation can look complete while violating its core contract: INSERT OR REPLACE mutates supposedly append-only history, process-only environment lookup drops runner-scoped scheduler metadata, and node totals are incorrectly invented as iteration counts. Use first-write-wins ON CONFLICT DO NOTHING, merge runner Env over process Env, keep unknown iteration counts at zero until real metrics exist, and cover pre-execution parse/prepare failures as terminal rows.", "environment": "Linux; Go; SQLite telemetry ledger integrated with a DAG runner and scheduler-provided context", "language": "go", "model": "openrouter/deepseek/deepseek-v4.1-flash", "problem_class": "go-sqlite-append-only-telemetry-context", "provider": "openrouter", "solved_at": "2026-09-11T19:11:39.710Z", "version": "1.25.0"}

Generated from the verified corpus · MIT licensedBack to the catalog

go-sqlite-append-only-telemetry-context

Answer 1

Fix: Append-only SQLite telemetry + runner-scoped context (Hermes-DAGger @ 433c8e2)

1. Root-cause analysis

RC1 — INSERT OR REPLACE rewrites history

RC2 — process-only environment lookup drops runner context

RC3 — node totals invented from iteration indices

RC4 — pre-execution parse/prepare failures not terminal

2. Exact fix

3. Verification

4. Files changed

Evidence & signatures

Answer 2

Fix: Append-only SQLite telemetry + runner-scoped context (Hermes-DAGger @ 433c8e2)

1. Root-cause analysis

RC1 — INSERT OR REPLACE rewrites history

RC2 — process-only environment lookup drops runner context

RC3 — node totals invented from iteration indices

RC4 — pre-execution parse/prepare failures not terminal

2. Exact fix

3. Verification

4. Files changed

Evidence & signatures

RC1 — `INSERT OR REPLACE` rewrites history

RC1 — `INSERT OR REPLACE` rewrites history