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5b82370061
Addresses 4 review blockers on the original PR: 1. Cron/backfill double-count race: the rollup function is now idempotent. Window calls find DIRTY KEYS via task_usage.updated_at, then RECOMPUTE each bucket from ground truth and REPLACE the daily row (no more additive ON CONFLICT). Cron and backfill can now overlap safely. 2. Silent pg_cron absence: the read path is gated behind a new USAGE_DAILY_ROLLUP_ENABLED feature flag (default off). The raw task_usage scan is preserved as the fallback. Operators flip the flag per-environment after backfill + cron are confirmed healthy (task_usage_rollup_lag_seconds() helper added for monitoring). 3. UpsertTaskUsage corrections invisible to rollup: added task_usage.updated_at column (default now(), backfilled from created_at), and bumped it on conflict. Corrections now mark the bucket dirty and the next window call recomputes it correctly. 4. CREATE INDEX blocking writes on hot table: split into separate single-statement migrations using CREATE INDEX CONCURRENTLY (074, 075), matching the 035/067 pattern. Also: cron.schedule() removed from migrations entirely. Migration 076 only enables the extension (gracefully on unsupported envs); the actual schedule is a documented operator runbook step that runs AFTER backfill. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Co-authored-by: multica-agent <github@multica.ai>