old_contents: """add instance.allow_proposal_pagination
  
  Revision ID: 581e036204e2
  Revises: 486aab29697a
  Create Date: 2014-05-30 17:32:06.053907
  
  """
  
  # revision identifiers, used by Alembic.
  revision = '581e036204e2'
  down_revision = '486aab29697a'
  
  from alembic import op
  import sqlalchemy as sa
  
  
  def upgrade():
      op.add_column('instance', sa.Column('allow_proposal_pagination', sa.Boolean(), nullable=True))
  
  
  def downgrade():
      op.drop_column('instance', 'allow_proposal_pagination')
  
new_contents: """add instance.allow_proposal_pagination
  
  Revision ID: 581e036204e2
  Revises: 486aab29697a
  Create Date: 2014-05-30 17:32:06.053907
  
  """
  
  # revision identifiers, used by Alembic.
  revision = '581e036204e2'
  down_revision = '486aab29697a'
  
  from alembic import op
  import sqlalchemy as sa
  from adhocracy.model import instance_table
  
  
  def upgrade():
      op.add_column('instance', sa.Column('allow_proposal_pagination',
                                          sa.Boolean))
      op.execute(instance_table.update().values(allow_proposal_pagination=True))
  
  
  def downgrade():
      op.drop_column('instance', 'allow_proposal_pagination')
  
subject: fix migration: set default value