{"record":{"id":"c147906ef9d17ac8","repo":"multica-ai/multica","slug":"read-database-clock-w","errorCode":null,"errorMessage":"read database clock: %w","messagePattern":"read database clock: %w","errorType":"console","errorClass":null,"httpStatus":null,"severity":"error","filePath":"server/cmd/backfill_codex_usage_cache/main.go","lineNumber":314,"sourceCode":"\t\t}\n\t\ttotalRows += rows\n\t\ttotalRemoved += removed\n\t\tslog.Info(\"updated Codex task_usage batch\", \"rows\", rows, \"input_tokens_removed\", removed, \"total_rows\", totalRows)\n\t\tif cfg.sleepBetweenBatches > 0 {\n\t\t\tselect {\n\t\t\tcase <-time.After(cfg.sleepBetweenBatches):\n\t\t\tcase <-ctx.Done():\n\t\t\t\treturn totalRows, totalRemoved, ctx.Err()\n\t\t\t}\n\t\t}\n\t}\n\treturn totalRows, totalRemoved, nil\n}\n\nfunc databaseClock(ctx context.Context, pool *pgxpool.Pool) (time.Time, error) {\n\tvar ts time.Time\n\tif err := pool.QueryRow(ctx, `SELECT clock_timestamp()`).Scan(&ts); err != nil {\n\t\treturn time.Time{}, fmt.Errorf(\"read database clock: %w\", err)\n\t}\n\treturn ts.UTC(), nil\n}\n\nfunc rollupWindow(startedAt, finishedAt time.Time) (time.Time, time.Time) {\n\treturn startedAt.UTC().Add(-time.Second), finishedAt.UTC().Add(time.Second)\n}\n\nfunc correctedInputTokens(inputTokens, cacheReadTokens int64) int64 {\n\tcorrected := inputTokens - cacheReadTokens\n\tif corrected < 0 {\n\t\treturn 0\n\t}\n\treturn corrected\n}\n","sourceCodeStart":296,"sourceCodeEnd":330,"githubUrl":"https://github.com/multica-ai/multica/blob/2c0912b6ec764b373d44eeea1e80f0d9f11ab417/server/cmd/backfill_codex_usage_cache/main.go#L296-L330","documentation":"Returned when the `SELECT clock_timestamp()` probe fails. The tool reads the database's own clock (not the client's) before and after the update phase to derive the rollup window, so the hourly rollup covers exactly the rows the backfill touched. Failure here is a plain connection/statement failure on a trivial query — the interesting part is when it happens: the second call occurs after updates, so data may already be corrected.","triggerScenarios":"Connection dying between the update batches and the clock read; postgres restart; ctx cancelled right at phase end. If it is the first clock read (before updates), nothing was modified.","commonSituations":"Flaky connections dropping at phase boundaries; failover during the run; the same environmental issues as other connection errors but surfacing at the cheapest query.","solutions":["Determine which clock read failed: if before updates (right after taking the advisory lock), simply re-run; if after updates, re-run anyway — corrected rows self-exclude and the rollup is rebuilt at the end.","Stabilize connectivity (network, pgbouncer idle limits) for the duration of the run.","After a successful re-run, verify the hourly rollup matches the dry-run totals in the logs."],"exampleFix":"# before\n./backfill_codex_usage_cache --cutoff ... --execute\n# read database clock: ... connection refused (db failover)\n\n# after\n# wait for postgres to stabilize, then re-run; the tool resumes safely\n./backfill_codex_usage_cache --cutoff 2026-06-01T12:00:00Z --execute","handlingStrategy":"retry","validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":["Stabilize connectivity (or reconnecting pooler settings) before the --execute phase.","After re-running to completion, verify the rollup log totals match the dry-run summary.","A failure at the second clock read means updates already applied — always re-run rather than starting from scratch."],"tags":["database","backfill","clock","connection","resumable"],"backgroundTag":null,"analyzedSha":"2c0912b6ec764b373d44eeea1e80f0d9f11ab417","analyzedAt":"2026-08-15T13:25:18.241Z","schemaVersion":2},"datasetVersion":"2026-08-15T22:17:37.221Z"}