text: """add_collections_collector_version
  
  Revision ID: 26f5d92723d
  Revises: 44c401df80b
  Create Date: 2015-04-18 20:05:57.811435
  
  """
  
  # revision identifiers, used by Alembic.
  revision = '26f5d92723d'
  down_revision = '44c401df80b'
  
  from alembic import op
  import sqlalchemy as sa
  
  
  def upgrade():
      op.add_column('collections', sa.Column('version_server', sa.String,
          nullable=False, index=True))
      op.add_column('collections', sa.Column('version_collector', sa.String,
          nullable=False, index=True))
  
  def downgrade():
      op.drop_column('collections', 'version_server')
      op.drop_column('collections', 'version_collector')
  