+ @classmethod
+ def by_date(cls, db_conn: DatabaseConnection,
+ date: str, create: bool = False):
+ """Retrieve Day by date if in DB, else return None."""
+ for row in db_conn.exec('SELECT * FROM days WHERE date = ?', (date,)):
+ return cls.from_table_row(row)
+ if create:
+ return cls(date)
+ return None
+