Use batch mode for migration

migrations/versions/134571bfe268_add_mfa_support.py

@@ -17,12 +17,10 @@ depends_on = None
 
 
 def upgrade():
-    # ### commands auto generated by Alembic - please adjust! ###
-    op.add_column('auth', sa.Column('realm', sa.String(length=25), server_default='password', nullable=True))
-    # ### end Alembic commands ###
+    with op.batch_alter_table('auth') as batch_op:
+        batch_op.add_column(sa.Column('realm', sa.String(length=25), server_default='password', nullable=True))
 
 
 def downgrade():
-    # ### commands auto generated by Alembic - please adjust! ###
-    op.drop_column('auth', 'realm')
-    # ### end Alembic commands ###
+    with op.batch_alter_table('auth') as batch_op:
+        batch_op.drop_column('realm')