old_contents: """add field age to participant
  
  Revision ID: e0887922f7df
  Revises: 18f6d14fe628
  Create Date: 2017-01-23 15:53:57.675916
  
  """
  
  # revision identifiers, used by Alembic.
  revision = 'e0887922f7df'
  down_revision = '18f6d14fe628'
  branch_labels = None
  depends_on = None
  
  from alembic import op
  import sqlalchemy as sa
  
  
  def upgrade():
      # ### commands auto generated by Alembic - please adjust! ###
      op.add_column('participant', sa.Column('age', sa.Float(), nullable=True))
      # ### end Alembic commands ###
  
  
  def downgrade():
      # ### commands auto generated by Alembic - please adjust! ###
      op.drop_column('participant', 'age')
      # ### end Alembic commands ###
  
new_contents: """add field age to participant
  
  Revision ID: e0887922f7df
  Revises: 18f6d14fe628
  Create Date: 2017-01-23 15:53:57.675916
  
  """
  
  # revision identifiers, used by Alembic.
  revision = 'e0887922f7df'
  down_revision = '18f6d14fe628'
  branch_labels = None
  depends_on = None
  
  from alembic import op
  
  
  def upgrade():
      # ### commands auto generated by Alembic - please adjust! ###
      op.add_column('participant', sa.Column('age', sa.Float(), nullable=True))
      # ### end Alembic commands ###
  
  
  def downgrade():
      # ### commands auto generated by Alembic - please adjust! ###
      op.drop_column('participant', 'age')
      # ### end Alembic commands ###
  
subject: remove unused import