new_contents: """empty message
  
  Revision ID: 0026 add expires, send_starts_at
  Revises: 0025 add email and email types
  Create Date: 2019-07-16 00:30:24.998868
  
  """
  
  # revision identifiers, used by Alembic.
  revision = '0026 add expires, send_starts_at'
  down_revision = '0025 add email and email types'
  
  from alembic import op
  import sqlalchemy as sa
  
  
  def upgrade():
      # ### commands auto generated by Alembic - please adjust! ###
      op.add_column('emails', sa.Column('expires', sa.DateTime(), nullable=True))
      op.add_column('emails', sa.Column('send_starts_at', sa.DateTime(), nullable=True))
      # ### end Alembic commands ###
  
  
  def downgrade():
      # ### commands auto generated by Alembic - please adjust! ###
      op.drop_column('emails', 'send_starts_at')
      op.drop_column('emails', 'expires')
      # ### end Alembic commands ###
  
subject: Add email migration script