Query
CREATE TABLE review_schedule_items (
id TEXT PRIMARY KEY,
schedule_id TEXT NOT NULL REFERENCES review_schedules(id) ON DELETE CASCADE,
subject TEXT NOT NULL,
topic_name TEXT NOT NULL,
item_type TEXT NOT NULL CHECK(item_type IN ('practice','error_review','mock')),
estimated_min INTEGER DEFAULT 10,
status TEXT DEFAULT 'pending' CHECK(status IN ('pending','completed')),
created_at DATETIME DEFAULT (datetime('now'))
)