Notification Pipeline

Multi-channel notification evaluation, batching, and delivery pipelines.

Status: Planned for Phase 2

Notification scheduler and FCM delivery pipelines will be documented in Phase 2.

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Attendance Engine & Inverted Persistence

Inverted attendance ledger, default-to-present failure modes, optimistic UI rollbacks, and foreign key cascade semantics.

Google Calendar Synchronization

Statement-coalesced queueing, PGMQ visibility timeouts, distributed leases, and OAuth token encryption.