diff --git a/backend/alembic/versions/025_ds_num.py b/backend/alembic/versions/025_ds_num.py
new file mode 100644
index 0000000..35fdfae
--- /dev/null
+++ b/backend/alembic/versions/025_ds_num.py
@@ -0,0 +1,29 @@
+"""025_ds_num
+
+Revision ID: 97dcdbedaaf3
+Revises: 4c6d18a18bd4
+Create Date: 2025-07-15 15:50:56.942959
+
+"""
+from alembic import op
+import sqlalchemy as sa
+import sqlmodel.sql.sqltypes
+from sqlalchemy.dialects import postgresql
+
+# revision identifiers, used by Alembic.
+revision = '97dcdbedaaf3'
+down_revision = '806bc67ff45f'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('core_datasource', sa.Column('num', sqlmodel.sql.sqltypes.AutoString(length=256), nullable=True))
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column('core_datasource', 'num')
+    # ### end Alembic commands ###