text: # Licensed to the Apache Software Foundation (ASF) under one
  # or more contributor license agreements.  See the NOTICE file
  # distributed with this work for additional information
  # regarding copyright ownership.  The ASF licenses this file
  # to you under the Apache License, Version 2.0 (the
  # "License"); you may not use this file except in compliance
  # with the License.  You may obtain a copy of the License at
  #
  #   http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing,
  # software distributed under the License is distributed on an
  # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  # KIND, either express or implied.  See the License for the
  # specific language governing permissions and limitations
  # under the License.
  """sqla_descr
  
  Revision ID: 55179c7f25c7
  Revises: 315b3f4da9b0
  Create Date: 2015-12-13 08:38:43.704145
  
  """
  
  # revision identifiers, used by Alembic.
  revision = "55179c7f25c7"
  down_revision = "315b3f4da9b0"
  
  from alembic import op
  import sqlalchemy as sa
  
  
  def upgrade():
      op.add_column("tables", sa.Column("description", sa.Text(), nullable=True))
  
  
  def downgrade():
      op.drop_column("tables", "description")
  