new_contents: """Add score.user_id column
  
  Revision ID: 0c98b865104f
  Revises: 7b6a65c708b9
  Create Date: 2016-10-27 19:03:44.901639
  
  """
  
  # revision identifiers, used by Alembic.
  revision = '0c98b865104f'
  down_revision = '7b6a65c708b9'
  
  from alembic import op
  import sqlalchemy as sa
  import server
  
  
  def upgrade():
      op.add_column('score', sa.Column('user_id', sa.Integer(), nullable=True))
      op.create_foreign_key(op.f('fk_score_user_id_user'), 'score', 'user', ['user_id'], ['id'])
  
      op.execute('''
      UPDATE score AS s
      JOIN backup AS b ON b.id = s.backup_id
      SET s.user_id = b.submitter_id
      ''')
  
      op.alter_column('score', 'user_id', existing_type=sa.Integer(), nullable=False)
  
  def downgrade():
      ### commands auto generated by Alembic - please adjust! ###
      op.drop_constraint(op.f('fk_score_user_id_user'), 'score', type_='foreignkey')
      op.drop_column('score', 'user_id')
      ### end Alembic commands ###
  
subject: Add migration that sets score.user_id appropriately