code: def downgrade():
      # ### commands auto generated by Alembic - please adjust! ###
      op.drop_table("run_info")
  
      op.drop_constraint(None, "note", type_="foreignkey")
      op.drop_column("note", "experiment_id")
      op.drop_column("experiment", "description")
  
imports: from alembic import op
  import sqlalchemy
label_desc: Use image node_id 2 for calling a global function with example usage: downgrade() without return types