Add migration

src/app/alembic/versions/750640043cd4_.py

@@ -0,0 +1,28 @@
+"""empty message
+
+Revision ID: 750640043cd4
+Revises: 7e45f53febe1
+Create Date: 2021-12-28 22:47:43.270886
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '750640043cd4'
+down_revision = '7e45f53febe1'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('user_settings', sa.Column('source', sa.String(length=32), nullable=False))
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column('user_settings', 'source')
+    # ### end Alembic commands ###