feat(models): add some type hints for Message

Signed-off-by: -LAN- <laipz8200@outlook.com>

api/models/model.py

@@ -914,11 +914,11 @@ class Message(Base):
     _inputs: Mapped[dict] = mapped_column("inputs", db.JSON)
     query: Mapped[str] = db.Column(db.Text, nullable=False)
     message = db.Column(db.JSON, nullable=False)
-    message_tokens = db.Column(db.Integer, nullable=False, server_default=db.text("0"))
+    message_tokens: Mapped[int] = db.Column(db.Integer, nullable=False, server_default=db.text("0"))
     message_unit_price = db.Column(db.Numeric(10, 4), nullable=False)
     message_price_unit = db.Column(db.Numeric(10, 7), nullable=False, server_default=db.text("0.001"))
     answer: Mapped[str] = db.Column(db.Text, nullable=False)
-    answer_tokens = db.Column(db.Integer, nullable=False, server_default=db.text("0"))
+    answer_tokens: Mapped[int] = db.Column(db.Integer, nullable=False, server_default=db.text("0"))
     answer_unit_price = db.Column(db.Numeric(10, 4), nullable=False)
     answer_price_unit = db.Column(db.Numeric(10, 7), nullable=False, server_default=db.text("0.001"))
     parent_message_id = db.Column(StringUUID, nullable=True)