code: def downgrade():
      # ### commands auto generated by Alembic - please adjust! ###
      with op.batch_alter_table("predictor", schema=None) as batch_op:
          batch_op.drop_column("training_stop_at")
          batch_op.drop_column("training_start_at")
  
imports: from alembic import op
  import sqlalchemy
  import mindsdb.interfaces.storage.db
label_desc: Use image node_id 2 for calling a global function with example usage: downgrade() without return types