old_contents: """Index Source.patch_id
  
  Revision ID: 5508859bed73
  Revises: 3042d0ca43bf
  Create Date: 2014-01-06 11:14:19.109932
  
  """
  
  # revision identifiers, used by Alembic.
  revision = '5508859bed73'
  down_revision = '3042d0ca43bf'
  
  from alembic import op
  
  
  def upgrade():
      op.create_index('idx_source_patch_id', 'source', ['patch_id'])
  
  
  def downgrade():
      op.drop_index('idx_source_patch_id', 'source')
  
new_contents: """Index Source.patch_id
  
  Revision ID: 5508859bed73
  Revises: 26f665189ca0
  Create Date: 2014-01-06 11:14:19.109932
  
  """
  
  # revision identifiers, used by Alembic.
  revision = '5508859bed73'
  down_revision = '26f665189ca0'
  
  from alembic import op
  
  
  def upgrade():
      op.create_index('idx_source_patch_id', 'source', ['patch_id'])
  
  
  def downgrade():
      op.drop_index('idx_source_patch_id', 'source')
  
subject: Correct base revision