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Jaayden Halko
20c376a575
The usage generator writes `hb_agent_runtime_v1` rows with `created_at` at the UTC hourly bucket start and exactly one row per bucket, but nothing in the schema enforced either invariant. A duplicate bucket row under a different id would be double-counted by any consumer summing `runtime_ms`, and a misaligned `created_at` would skew which usage period a bucket is attributed to. This replaces the non-unique partial index `idx_usage_events_agent_runtime` (from migration 000561) with a unique index of the same shape and adds an hour-alignment `CHECK` constraint. Both statements validate existing rows: every supported writer has always produced conforming data, so a pre-existing violator is anomalous and failing the migration loudly beats silently rewriting usage rows. `generateBucket` treats a unique violation on the bucket index as another replica having won the race, mirroring the existing `ON CONFLICT (id)` no-op for committed rows. The `coderd/notifications` sync commit and its revert cancel out (the drift they addressed was fixed on main by #27979); the PR's net diff is only the usage-event changes. Part 1 of a 3-PR stack splitting up #27796 (see there for review history). Stack: this PR → #27984 → #27985.