pub async fn insert_batch(
conn: &mut PgConnection,
page_id_history_id_contents: Vec<(Uuid, (Uuid, String))>,
) -> ModelResult<Vec<CoursePageMarkdownContent>>pub async fn insert_batch(
conn: &mut PgConnection,
page_id_history_id_contents: Vec<(Uuid, (Uuid, String))>,
) -> ModelResult<Vec<CoursePageMarkdownContent>>