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Oliver Kieselbach
3d10011460
A session without a Sessions row can never be reached by the cascade, so every row written for it was an orphan by construction. Three layers now keep the platform clean: - Prevent: IngestTelemetry answers a batch for an unknown session with 410 (same status and body as the cascade lock; request-row marker IngestRefusal = session_unknown | cascade_locked). The derived writers - vulnerability correlation, analyze, manual rescan - stop on SessionDeletionGuard.GetLivenessAsync != Live. The agent treats every 410 as terminal: one TelemetryRejectedSessionUnknown report (exempt from the reporter cooldown), then terminate_session with forced self-destruct (origin session_gone, no final drain, no diagnostics upload); spool items of a foreign session id are dropped at startup and never terminate the current session. - Detect: OrphanSessionSweepFunction (every 4h at :45, own lease) diffs the Sessions keys against the EventSessionIndex handles - two range drains instead of ~16.8k Sessions point reads per 2h maintenance run - and re-checks every candidate (handle unchanged, row still absent, tombstone) moments before deleting. The in-maintenance sweep raced the retention cascade on their shared 00:00/12:00 tick and reported false orphans; it is gone. - Clean: every table of the cascade manifest minus the tombstone pair (ratchet in TableLifecycleBucketTests), the inventory counters with the stamp on the handle (claim, then decrement), the handle last with If-Match. A weekly read-only reconciliation of EventTypeIndex against the Sessions keys (Sunday mornings UTC, and on every manual maintenance run) reports residue. MaintenanceCompleted now carries stepsMs. MCP search_sessions_by_event auto-exhausts empty-but-continuable pages. Manifests regenerated for the new ops event types and AdminConfiguration.OrphanDeepCheckLastRunUtc. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>