text: """add_start_end_time
  
  Revision ID: 4b16194c56bc
  Revises: 52804f2498c4
  Create Date: 2018-03-23 00:36:29.031259
  
  """
  
  # revision identifiers, used by Alembic.
  revision = '4b16194c56bc'
  down_revision = '52804f2498c4'
  
  from alembic import op
  import sqlalchemy as sa
  
  
  def upgrade():
      op.add_column('audits', sa.Column('start_time', sa.DateTime(), nullable=True))
      op.add_column('audits', sa.Column('end_time', sa.DateTime(), nullable=True))
  
  
  def downgrade():
      op.drop_column('audits', 'start_time')
      op.drop_column('audits', 'end_time')
  