text: """empty message
  
  Revision ID: 15a9c11e77da
  Revises: 3d747ff9f9dd
  Create Date: 2014-06-26 12:12:40.413709
  
  """
  
  # revision identifiers, used by Alembic.
  revision = '15a9c11e77da'
  down_revision = '3d747ff9f9dd'
  
  from alembic import op
  import sqlalchemy as sa
  
  
  def upgrade():
      ### commands auto generated by Alembic - please adjust! ###
      op.add_column('group', sa.Column('leavable', sa.Boolean(), nullable=True))
      ### end Alembic commands ###
  
  
  def downgrade():
      ### commands auto generated by Alembic - please adjust! ###
      op.drop_column('group', 'leavable')
      ### end Alembic commands ###
  