code: def downgrade():
      # ### commands auto generated by Alembic - please adjust! ###
      op.drop_table("run_tag")
      op.drop_index(op.f("ix_run_hash"), table_name="run")
      op.drop_table("run")
      op.drop_index(op.f("ix_tag_uuid"), table_name="tag")
      op.drop_table("tag")
      op.drop_index(op.f("ix_experiment_uuid"), table_name="experiment")
      op.drop_table("experiment")
  
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