pub async fn unlock_chapter(
conn: &mut PgConnection,
user_id: Uuid,
chapter_id: Uuid,
course_id: Uuid,
) -> ModelResult<UserChapterLockingStatus>pub async fn unlock_chapter(
conn: &mut PgConnection,
user_id: Uuid,
chapter_id: Uuid,
course_id: Uuid,
) -> ModelResult<UserChapterLockingStatus>