fix: chat record save error

backend/alembic/versions/031_modify_chat_record.py

@@ -0,0 +1,33 @@
+"""031_modify_chat_record
+
+Revision ID: bd2ed188b5bd
+Revises: c1d7ac00b3a8
+Create Date: 2025-07-21 17:27:55.985821
+
+"""
+from alembic import op
+import sqlalchemy as sa
+import sqlmodel.sql.sqltypes
+from sqlalchemy.dialects import postgresql
+
+# revision identifiers, used by Alembic.
+revision = 'bd2ed188b5bd'
+down_revision = 'c1d7ac00b3a8'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.alter_column('chat_record', 'engine_type',
+               existing_type=sa.VARCHAR(length=64),
+               nullable=True)
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.alter_column('chat_record', 'engine_type',
+               existing_type=sa.VARCHAR(length=64),
+               nullable=False)
+    # ### end Alembic commands ###

backend/apps/chat/models/chat_model.py

@@ -36,7 +36,7 @@ class ChatRecord(SQLModel, table=True):
     finish_time: datetime = Field(sa_column=Column(DateTime(timezone=False), nullable=True))
     create_by: int = Field(sa_column=Column(BigInteger, nullable=True))
     datasource: int = Field(sa_column=Column(BigInteger, nullable=True))
-    engine_type: str = Field(max_length=64)
+    engine_type: str = Field(max_length=64, nullable=True)
     question: str = Field(sa_column=Column(Text, nullable=True))
     sql_answer: str = Field(sa_column=Column(Text, nullable=True))
     sql: str = Field(sa_column=Column(Text, nullable=True))