Notifications + SSE

In-app notifications persist as rows in the notifications table and stream to the user's personal channel in realtime via SSE. Facteur (@facteurjs/adonisjs) is the framework: one Notification<User, Params> class per type, with a deliverBy: { database, transmit } config and per-channel methods (asDatabaseMessage, asTransmitMessage). Transmit (@adonisjs/transmit) is the SSE transport — in-memory / single-node by default (transport: null in config/transmit.ts); swap to a distributed transport (e.g. Redis) when scaling out to multiple instances. Emission always goes through domain events: actions emit, a listener calls facteur.notification(...).params(...).to([user]).send().

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