feat: implement notifications system with API endpoints for fetching and marking notifications as read

src/lib/init-db.js

@@ -477,5 +477,28 @@ export default function initializeDatabase() {
 		-- Create index for password reset tokens
 		CREATE INDEX IF NOT EXISTS idx_password_reset_token ON password_reset_tokens(token);
 		CREATE INDEX IF NOT EXISTS idx_password_reset_user ON password_reset_tokens(user_id);
+
+		-- Notifications table
+		CREATE TABLE IF NOT EXISTS notifications (
+			id INTEGER PRIMARY KEY AUTOINCREMENT,
+			user_id TEXT NOT NULL,
+			type TEXT NOT NULL CHECK(type IN ('task_assigned', 'task_status_changed', 'project_updated', 'due_date_reminder', 'system_announcement', 'mention')),
+			title TEXT NOT NULL,
+			message TEXT NOT NULL,
+			resource_type TEXT,
+			resource_id TEXT,
+			is_read INTEGER DEFAULT 0,
+			priority TEXT DEFAULT 'normal' CHECK(priority IN ('low', 'normal', 'high', 'urgent')),
+			created_at TEXT DEFAULT CURRENT_TIMESTAMP,
+			expires_at TEXT,
+			action_url TEXT,
+			FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
+		);
+
+		-- Create indexes for notifications
+		CREATE INDEX IF NOT EXISTS idx_notifications_user ON notifications(user_id);
+		CREATE INDEX IF NOT EXISTS idx_notifications_user_read ON notifications(user_id, is_read);
+		CREATE INDEX IF NOT EXISTS idx_notifications_created ON notifications(created_at);
+		CREATE INDEX IF NOT EXISTS idx_notifications_type ON notifications(type);
 	`);
 }