diff --git a/backend/alembic.ini b/backend/alembic.ini
index f4d95fed..11849c0e 100755
--- a/backend/alembic.ini
+++ b/backend/alembic.ini
@@ -6,7 +6,7 @@ script_location = alembic
 
 # template used to generate migration files
 # file_template = %%(rev)s_%%(slug)s
-file_template = %%(slug)s.py
+file_template = %%(slug)s
 
 # timezone to use when rendering the date
 # within the migration file as well as the filename.
diff --git a/backend/alembic/versions/015_modify_chat.py b/backend/alembic/versions/015_modify_chat.py
new file mode 100644
index 00000000..c1c961ff
--- /dev/null
+++ b/backend/alembic/versions/015_modify_chat.py
@@ -0,0 +1,33 @@
+"""015_modify_chat
+
+Revision ID: 02d84523a979
+Revises: fde8acca6143
+Create Date: 2025-06-25 15:45:14.968598
+
+"""
+from alembic import op
+import sqlalchemy as sa
+import sqlmodel.sql.sqltypes
+from sqlalchemy.dialects import postgresql
+
+# revision identifiers, used by Alembic.
+revision = '02d84523a979'
+down_revision = 'fde8acca6143'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.alter_column('chat', 'datasource',
+               existing_type=sa.INTEGER(),
+               nullable=True)
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.alter_column('chat', 'datasource',
+               existing_type=sa.INTEGER(),
+               nullable=False)
+    # ### end Alembic commands ###
diff --git a/backend/apps/chat/models/chat_model.py b/backend/apps/chat/models/chat_model.py
index 43d3bea3..e5098ae7 100644
--- a/backend/apps/chat/models/chat_model.py
+++ b/backend/apps/chat/models/chat_model.py
@@ -18,7 +18,7 @@ class Chat(SQLModel, table=True):
     create_by: int = Field(sa_column=Column(BigInteger, nullable=True))
     brief: str = Field(max_length=64, nullable=True)
     chat_type: str = Field(max_length=20, default="chat")  # chat, datasource
-    datasource: int = Field(sa_column=Column(Integer, nullable=False))
+    datasource: int = Field(sa_column=Column(Integer, nullable=True))
     engine_type: str = Field(max_length=64)