old_contents: """add message index
  
  Revision ID: 4270a032b943
  Revises: 1d93c9f9f506
  Create Date: 2015-02-06 05:14:00.041485
  
  """
  
  # revision identifiers, used by Alembic.
  revision = '4270a032b943'
  down_revision = '1d93c9f9f506'
  
  from alembic import op
  
  
  def upgrade():
      op.create_index('ix_message_namespace_id_deleted_at', 'message',
                      ['namespace_id', 'deleted_at'], unique=False)
  
  
  def downgrade():
      op.drop_index('ix_message_namespace_id_deleted_at', table_name='message')
  
new_contents: """add message index
  
  Revision ID: 4270a032b943
  Revises:13faec74da45
  Create Date: 2015-02-06 05:14:00.041485
  
  """
  
  # revision identifiers, used by Alembic.
  revision = '4270a032b943'
  down_revision = '13faec74da45'
  
  from alembic import op
  
  
  def upgrade():
      op.create_index('ix_message_namespace_id_deleted_at', 'message',
                      ['namespace_id', 'deleted_at'], unique=False)
  
  
  def downgrade():
      op.drop_index('ix_message_namespace_id_deleted_at', table_name='message')
  
subject: Fix migration linearity.