code: def downgrade():
      with op.batch_alter_table("sql_metrics") as batch_op_sql_metrics:
          batch_op_sql_metrics.drop_column("warning_text")
      with op.batch_alter_table("metrics") as batch_op_metrics:
          batch_op_metrics.drop_column("warning_text")
  
imports: import sqlalchemy
  from alembic import op
label_desc: Use image node_id 2 for calling a global function with example usage: downgrade() without return types