diff --git a/api/models/model.py b/api/models/model.py
index 81900dc8a4..b052978e5a 100644
--- a/api/models/model.py
+++ b/api/models/model.py
@@ -1843,37 +1843,39 @@ class MessageAgentThought(TypeBase):
         sa.Index("message_agent_thought_message_chain_id_idx", "message_chain_id"),
     )
 
-    id: Mapped[str] = mapped_column(StringUUID, default=lambda: str(uuid4()))
+    id: Mapped[str] = mapped_column(
+        StringUUID, insert_default=lambda: str(uuid4()), default_factory=lambda: str(uuid4()), init=False
+    )
     message_id: Mapped[str] = mapped_column(StringUUID, nullable=False)
-    message_chain_id: Mapped[str | None] = mapped_column(StringUUID, nullable=True)
     position: Mapped[int] = mapped_column(sa.Integer, nullable=False)
-    thought: Mapped[str | None] = mapped_column(LongText, nullable=True)
-    tool: Mapped[str | None] = mapped_column(LongText, nullable=True)
-    tool_labels_str: Mapped[str] = mapped_column(LongText, nullable=False, default=sa.text("'{}'"))
-    tool_meta_str: Mapped[str] = mapped_column(LongText, nullable=False, default=sa.text("'{}'"))
-    tool_input: Mapped[str | None] = mapped_column(LongText, nullable=True)
-    observation: Mapped[str | None] = mapped_column(LongText, nullable=True)
-    # plugin_id = mapped_column(StringUUID, nullable=True)  ## for future design
-    tool_process_data: Mapped[str | None] = mapped_column(LongText, nullable=True)
-    message: Mapped[str | None] = mapped_column(LongText, nullable=True)
-    message_token: Mapped[int | None] = mapped_column(sa.Integer, nullable=True)
-    message_unit_price: Mapped[Decimal | None] = mapped_column(sa.Numeric, nullable=True)
-    message_price_unit: Mapped[Decimal] = mapped_column(
-        sa.Numeric(10, 7), nullable=False, server_default=sa.text("0.001")
-    )
-    message_files: Mapped[str | None] = mapped_column(LongText, nullable=True)
-    answer: Mapped[str | None] = mapped_column(LongText, nullable=True)
-    answer_token: Mapped[int | None] = mapped_column(sa.Integer, nullable=True)
-    answer_unit_price: Mapped[Decimal | None] = mapped_column(sa.Numeric, nullable=True)
-    answer_price_unit: Mapped[Decimal] = mapped_column(
-        sa.Numeric(10, 7), nullable=False, server_default=sa.text("0.001")
-    )
-    tokens: Mapped[int | None] = mapped_column(sa.Integer, nullable=True)
-    total_price: Mapped[Decimal | None] = mapped_column(sa.Numeric, nullable=True)
-    currency: Mapped[str | None] = mapped_column(String(255), nullable=True)
-    latency: Mapped[float | None] = mapped_column(sa.Float, nullable=True)
     created_by_role: Mapped[str] = mapped_column(String(255), nullable=False)
     created_by: Mapped[str] = mapped_column(StringUUID, nullable=False)
+    message_chain_id: Mapped[str | None] = mapped_column(StringUUID, nullable=True, default=None)
+    thought: Mapped[str | None] = mapped_column(LongText, nullable=True, default=None)
+    tool: Mapped[str | None] = mapped_column(LongText, nullable=True, default=None)
+    tool_labels_str: Mapped[str] = mapped_column(LongText, nullable=False, default=sa.text("'{}'"))
+    tool_meta_str: Mapped[str] = mapped_column(LongText, nullable=False, default=sa.text("'{}'"))
+    tool_input: Mapped[str | None] = mapped_column(LongText, nullable=True, default=None)
+    observation: Mapped[str | None] = mapped_column(LongText, nullable=True, default=None)
+    # plugin_id = mapped_column(StringUUID, nullable=True)  ## for future design
+    tool_process_data: Mapped[str | None] = mapped_column(LongText, nullable=True, default=None)
+    message: Mapped[str | None] = mapped_column(LongText, nullable=True, default=None)
+    message_token: Mapped[int | None] = mapped_column(sa.Integer, nullable=True, default=None)
+    message_unit_price: Mapped[Decimal | None] = mapped_column(sa.Numeric, nullable=True, default=None)
+    message_price_unit: Mapped[Decimal] = mapped_column(
+        sa.Numeric(10, 7), nullable=False, default=Decimal("0.001"), server_default=sa.text("0.001")
+    )
+    message_files: Mapped[str | None] = mapped_column(LongText, nullable=True, default=None)
+    answer: Mapped[str | None] = mapped_column(LongText, nullable=True, default=None)
+    answer_token: Mapped[int | None] = mapped_column(sa.Integer, nullable=True, default=None)
+    answer_unit_price: Mapped[Decimal | None] = mapped_column(sa.Numeric, nullable=True, default=None)
+    answer_price_unit: Mapped[Decimal] = mapped_column(
+        sa.Numeric(10, 7), nullable=False, default=Decimal("0.001"), server_default=sa.text("0.001")
+    )
+    tokens: Mapped[int | None] = mapped_column(sa.Integer, nullable=True, default=None)
+    total_price: Mapped[Decimal | None] = mapped_column(sa.Numeric, nullable=True, default=None)
+    currency: Mapped[str | None] = mapped_column(String(255), nullable=True, default=None)
+    latency: Mapped[float | None] = mapped_column(sa.Float, nullable=True, default=None)
     created_at: Mapped[datetime] = mapped_column(
         sa.DateTime, nullable=False, init=False, server_default=sa.func.current_timestamp()
     )