async fn load_chapter(
conn: &mut PgConnection,
already_loaded_chapter: Option<Option<DatabaseChapter>>,
chapter_id: Option<Uuid>,
) -> ModelResult<Option<DatabaseChapter>>async fn load_chapter(
conn: &mut PgConnection,
already_loaded_chapter: Option<Option<DatabaseChapter>>,
chapter_id: Option<Uuid>,
) -> ModelResult<Option<DatabaseChapter>>