Sync from /srv/compose/unified-media-manager

internal/db/migrations/009_notifications.sql

@@ -0,0 +1,45 @@
+-- Notification system schema
+CREATE TYPE NOTIFICATION_CHANNEL_TYPE AS ENUM ('webhook', 'telegram');
+CREATE TYPE NOTIFICATION_STATUS AS ENUM ('pending', 'delivering', 'delivered', 'failed', 'dead');
+
+CREATE TABLE notification_channels (
+    id         BIGSERIAL PRIMARY KEY,
+    name       TEXT NOT NULL,
+    type       NOTIFICATION_CHANNEL_TYPE NOT NULL,
+    enabled    BOOLEAN DEFAULT true,
+    config     JSONB NOT NULL DEFAULT '{}',
+    created_at TIMESTAMPTZ DEFAULT NOW(),
+    updated_at TIMESTAMPTZ DEFAULT NOW()
+);
+
+CREATE TABLE notification_subscriptions (
+    id         BIGSERIAL PRIMARY KEY,
+    channel_id BIGINT NOT NULL REFERENCES notification_channels(id) ON DELETE CASCADE,
+    event_type EVENT_TYPE NOT NULL,
+    UNIQUE(channel_id, event_type)
+);
+
+CREATE TABLE notification_queue (
+    id           BIGSERIAL PRIMARY KEY,
+    channel_id   BIGINT NOT NULL REFERENCES notification_channels(id) ON DELETE CASCADE,
+    event_type   EVENT_TYPE NOT NULL,
+    title        TEXT NOT NULL,
+    message      JSONB NOT NULL DEFAULT '{}',
+    status       NOTIFICATION_STATUS DEFAULT 'pending',
+    attempts     INT DEFAULT 0,
+    max_attempts INT DEFAULT 5,
+    last_error   TEXT,
+    next_retry_at TIMESTAMPTZ,
+    created_at   TIMESTAMPTZ DEFAULT NOW(),
+    delivered_at TIMESTAMPTZ
+);
+
+CREATE TABLE notification_state (
+    id                  INT PRIMARY KEY DEFAULT 1 CHECK (id = 1),
+    last_event_id       BIGINT DEFAULT 0,
+    last_event_created_at TIMESTAMPTZ
+);
+
+CREATE INDEX idx_notification_queue_status ON notification_queue (status, next_retry_at);
+
+INSERT INTO notification_state (id) VALUES (1) ON CONFLICT DO NOTHING;