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Marc-André Bombeck
46047e57c0
A history backfill carried one access token through walks that outlive it. After an hour every request answered 401, which classifies as a revoked grant, so the account was parked at error_reauth with a refresh token that was still valid, and every later run skipped it until a manual reconnect. Running beside the hourly sync, the backfill also pushed the account over Google's per-minute quota, and each 429 failed its whole collection. - Walks take a token source that renews the access token before it expires and once more when Google refuses it mid-walk. - A 429 is waited out (Retry-After, RetryInfo, else a doubling backoff) and the request repeated; it is never a reauth. - error_reauth only short-circuits a run when the token endpoint refused the grant (needsReauth). A connection parked by a data request's 401 refreshes on its next run and clears itself when that run completes. - One run per account at a time: syncs, the backfill and the sleep repair share an advisory lock. The hourly poll skips a held account, a manual sync answers 409 sync_in_progress, the backfill waits a bounded time. - A backfill attempt records each collection it finishes cleanly (backfill_progress) and the next attempt resumes with the rest. - The incremental watermark is stamped with the cycle's start, not its end. Overlapping sleep segments that share a stage and an end share the natural key (type, measuredAt, source, sleepStage). A re-score that moved one row onto a sibling's slot threw P2002 and failed the sync on every run. - A batch keeps one reading per natural key, chosen the same way each time (longer segment, then smaller externalId). - A move that still collides is settled by reconcileExternalMeasurement, which retires the stale row, instead of failing the sync. - Updates run before inserts, and the key-format rescue no longer re-keys a row this batch is moving. - The sleep replace-by-window protects every session's fresh rows, so two overlapping sessions no longer tombstone and resurrect each other hourly. Refs #1194, #1195