(sqlite3.IntegrityError) UNIQUE constraint failed: favorite.user_id, favorite.course_id [SQL: INSERT INTO favorite (user_id, course_id, created_at) VALUES (?, ?, ?)] [parameters: (3, 97, ‘2026-05-04 13:15:45.511925’)] (Background on this error at: https://sqlalche.me/e/20/gkpj)