Add user notification inbox and delivery controls

database/schema.sql

@@ -25,6 +25,30 @@ CREATE TABLE IF NOT EXISTS avatar_reviews (
 	reviewed_by TEXT REFERENCES users(id),
 	review_note TEXT
 );
+CREATE TABLE IF NOT EXISTS notifications (
+	id TEXT PRIMARY KEY,
+	user_id TEXT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+	category TEXT NOT NULL CHECK(category IN ('isac', 'contributions', 'comments', 'builds', 'guides', 'system')),
+	source TEXT NOT NULL,
+	title TEXT NOT NULL,
+	body TEXT NOT NULL,
+	link TEXT,
+	mandatory INTEGER NOT NULL DEFAULT 0 CHECK(mandatory IN (0, 1)),
+	created_at TEXT NOT NULL,
+	read_at TEXT,
+	emailed_at TEXT
+);
+CREATE INDEX IF NOT EXISTS notifications_user_created_idx ON notifications(user_id, created_at DESC);
+CREATE INDEX IF NOT EXISTS notifications_user_unread_idx ON notifications(user_id, read_at, created_at DESC);
+CREATE TABLE IF NOT EXISTS notification_preferences (
+	user_id TEXT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+	category TEXT NOT NULL CHECK(category IN ('isac', 'contributions', 'comments', 'builds', 'guides', 'system')),
+	in_app_enabled INTEGER NOT NULL DEFAULT 1 CHECK(in_app_enabled IN (0, 1)),
+	browser_enabled INTEGER NOT NULL DEFAULT 0 CHECK(browser_enabled IN (0, 1)),
+	email_frequency TEXT NOT NULL DEFAULT 'none' CHECK(email_frequency IN ('none', 'immediate', 'daily')),
+	updated_at TEXT NOT NULL,
+	PRIMARY KEY(user_id, category)
+);
 CREATE INDEX IF NOT EXISTS avatar_reviews_status_submitted_idx ON avatar_reviews(status, submitted_at DESC);
 CREATE INDEX IF NOT EXISTS avatar_reviews_user_submitted_idx ON avatar_reviews(user_id, submitted_at DESC);
 CREATE TABLE IF NOT EXISTS builds (id TEXT PRIMARY KEY, owner_id TEXT NOT NULL REFERENCES users(id), title TEXT NOT NULL, slug TEXT NOT NULL UNIQUE, visibility TEXT NOT NULL DEFAULT 'draft', summary TEXT, guide_body TEXT, source_build_id TEXT REFERENCES builds(id), created_at TEXT NOT NULL, updated_at TEXT NOT NULL);