diff --git a/api/models/model.py b/api/models/model.py
index 818021eb42..56011d5618 100644
--- a/api/models/model.py
+++ b/api/models/model.py
@@ -1369,12 +1369,12 @@ class MessageAnnotation(Base):
     app_id: Mapped[str] = mapped_column(StringUUID)
     conversation_id: Mapped[str | None] = mapped_column(StringUUID, sa.ForeignKey("conversations.id"))
     message_id: Mapped[str | None] = mapped_column(StringUUID)
-    question = mapped_column(sa.Text, nullable=True)
-    content = mapped_column(sa.Text, nullable=False)
+    question: Mapped[str | None] = mapped_column(sa.Text, nullable=True)
+    content: Mapped[str] = mapped_column(sa.Text, nullable=False)
     hit_count: Mapped[int] = mapped_column(sa.Integer, nullable=False, server_default=sa.text("0"))
-    account_id = mapped_column(StringUUID, nullable=False)
-    created_at = mapped_column(sa.DateTime, nullable=False, server_default=func.current_timestamp())
-    updated_at = mapped_column(sa.DateTime, nullable=False, server_default=func.current_timestamp())
+    account_id: Mapped[str] = mapped_column(StringUUID, nullable=False)
+    created_at: Mapped[datetime] = mapped_column(sa.DateTime, nullable=False, server_default=func.current_timestamp())
+    updated_at: Mapped[datetime] = mapped_column(sa.DateTime, nullable=False, server_default=func.current_timestamp())
 
     @property
     def account(self):