- GET returns { eventKeys, channelTypes, matrix } where matrix defaults to
true when no row exists (D-15 opt-out model)
- PUT UPSERTs single row via composite PK ON CONFLICT
- Validates: event_key (non-empty, <=128 chars), channel_type via
isPersonalChannelType, enabled as typeof boolean
- Write target always session.user.id (T-09-02-01, T-09-02-03)
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|---|---|---|
| .. | ||
| channels | ||
| notification-subscriptions | ||
| theme | ||
| timezone | ||