-- Push notification subscriptions for Web Push API
CREATE TABLE IF NOT EXISTS push_subscriptions (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    endpoint TEXT NOT NULL UNIQUE,
    key_p256dh TEXT NOT NULL,
    key_auth TEXT NOT NULL,
    user_agent TEXT DEFAULT '',
    created_at DATETIME NOT NULL DEFAULT (datetime('now'))
);

CREATE INDEX IF NOT EXISTS idx_push_subscriptions_user_id ON push_subscriptions(user_id);