message: [migrations] Cleaning up migration logic
diff: @@ -59,9 +59,6 @@ def downgrade():
  )
  # Remove the previous missing uniqueness constraints.
  - bind = op.get_bind()
  - insp = sa.engine.reflection.Inspector.from_engine(bind)
  -
  for table, column in names.items():
  with op.batch_alter_table(table, naming_convention=conv) as batch_op:
  batch_op.drop_constraint(
  