diff --git a/backend/alembic/versions/021_user_ws_ddl.py b/backend/alembic/versions/021_user_ws_ddl.py
new file mode 100644
index 0000000..fe05292
--- /dev/null
+++ b/backend/alembic/versions/021_user_ws_ddl.py
@@ -0,0 +1,33 @@
+"""021_user_ws_ddl
+
+Revision ID: 440e9e41da3c
+Revises: a6b44114c17f
+Create Date: 2025-07-07 17:21:46.858887
+
+"""
+from alembic import op
+import sqlalchemy as sa
+import sqlmodel.sql.sqltypes
+
+
+# revision identifiers, used by Alembic.
+revision = '440e9e41da3c'
+down_revision = 'a6b44114c17f'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    op.create_table(
+        'sys_user_ws',
+        sa.Column('id', sa.BigInteger(), primary_key=True, nullable=False),
+        sa.Column('uid', sa.BigInteger(), nullable=False),
+        sa.Column('oid', sa.BigInteger(), nullable=False),
+        sa.Column('weight', sa.Integer(), nullable=False)
+    )
+    op.create_index(op.f('ix_sys_user_ws_id'), 'sys_user_ws', ['id'], unique=False)
+
+
+def downgrade():
+    #op.drop_index(op.f('ix_sys_user_ws_id'), table_name='sys_user_ws')
+    op.drop_table('sys_user_ws')