new_contents: """empty message
  
  Revision ID: a23682ccc1f1
  Revises: 9bd17364fc18
  Create Date: 2018-04-20 10:39:31.976959
  
  """
  from alembic import op
  import sqlalchemy as sa
  import sqlalchemy_utils
  
  
  # revision identifiers, used by Alembic.
  revision = 'a23682ccc1f1'
  down_revision = '9bd17364fc18'
  branch_labels = None
  depends_on = None
  
  
  def upgrade():
      # ### commands auto generated by Alembic - please adjust! ###
      op.create_table('desktop_login_log',
      sa.Column('id', sqlalchemy_utils.types.uuid.UUIDType(binary=False), nullable=False),
      sa.Column('created_at', sa.DateTime(), nullable=True),
      sa.Column('updated_at', sa.DateTime(), nullable=True),
      sa.Column('person_id', sqlalchemy_utils.types.uuid.UUIDType(binary=False), nullable=False),
      sa.Column('date', sa.DateTime(), nullable=False),
      sa.ForeignKeyConstraint(['person_id'], ['person.id'], ),
      sa.PrimaryKeyConstraint('id')
      )
      op.create_index(op.f('ix_desktop_login_log_person_id'), 'desktop_login_log', ['person_id'], unique=False)
      op.add_column('asset_instance', sa.Column('active', sa.Boolean(), nullable=True))
      # ### end Alembic commands ###
  
  
  def downgrade():
      # ### commands auto generated by Alembic - please adjust! ###
      op.drop_column('asset_instance', 'active')
      op.drop_index(op.f('ix_desktop_login_log_person_id'), table_name='desktop_login_log')
      op.drop_table('desktop_login_log')
      # ### end Alembic commands ###
  
subject: Add migration scripts for DB schema