feat: add schedule, notifications, and recommendations

migrations/004_add_notifications.sql

@@ -0,0 +1,12 @@
+-- Add episode tracking to watch list entries
+ALTER TABLE watch_list_entry ADD COLUMN current_episode INTEGER DEFAULT 0;
+ALTER TABLE watch_list_entry ADD COLUMN last_episode_at DATETIME;
+
+-- Add notification preferences
+CREATE TABLE IF NOT EXISTS notification_preference (
+    id TEXT PRIMARY KEY,
+    user_id TEXT NOT NULL REFERENCES user(id) ON DELETE CASCADE,
+    notify_new_episodes BOOLEAN NOT NULL DEFAULT TRUE,
+    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    UNIQUE(user_id)
+);