message: Fix alembic migration
diff: """Delete table_name unique constraint in mysql
  Revision ID: 18532d70ab98
  -Revises: e5ef6828ac4e
  +Revises: 3fbbc6e8d654
  Create Date: 2020-09-25 10:56:13.711182
  """
  # revision identifiers, used by Alembic.
  revision = "18532d70ab98"
  -down_revision = "e5ef6828ac4e"
  +down_revision = "3fbbc6e8d654"
  from alembic import op
  