text: """Add frozen field to bundle.
  
  Revision ID: 6c013a88862f
  Revises: e24a53ae9241
  Create Date: 2021-02-28 02:31:07.648416
  
  """
  
  from alembic import op
  import sqlalchemy as sa
  
  # revision identifiers, used by Alembic.
  revision = '6c013a88862f'
  down_revision = 'e24a53ae9241'
  
  
  def upgrade():
      op.add_column('bundle', sa.Column('frozen', sa.DateTime(), nullable=True))
  
  
  def downgrade():
      op.drop_column('bundle', 'frozen')
  