chore: perauset customer project

sql/0008-notifications.sql

@@ -0,0 +1,13 @@
+CREATE TABLE app.notification (
+  notification_id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  user_id UUID NOT NULL REFERENCES app."user"(user_id),
+  type TEXT NOT NULL,
+  title TEXT NOT NULL,
+  body TEXT,
+  entity_type TEXT,
+  entity_id UUID,
+  read_at TIMESTAMPTZ,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE INDEX idx_notification_user ON app.notification(user_id, read_at, created_at DESC);