new_contents: """Add Build.collection_id
  
  Revision ID: 1cb3db431e29
  Revises: 3aed22af8f4f
  Create Date: 2014-12-10 22:00:33.463247
  
  """
  
  # revision identifiers, used by Alembic.
  revision = '1cb3db431e29'
  down_revision = '3aed22af8f4f'
  
  from alembic import op
  import sqlalchemy as sa
  
  
  def upgrade():
      op.add_column('build', sa.Column('collection_id', sa.GUID(), nullable=True))
      op.create_index('idx_build_collection_id', 'build', ['collection_id'])
  
  
  def downgrade():
      op.drop_index('idx_build_collection_id', 'build')
      op.drop_column('build', 'collection_id')
  
subject: Add build.collection_id column