code: def downgrade():
      with op.batch_alter_table("study_user_attributes") as batch_op:
          batch_op.alter_column(
              "value_json", type_=sa.String(MAX_STRING_LENGTH)
          )
      with op.batch_alter_table("study_system_attributes") as batch_op:
          batch_op.alter_column(
              "value_json", type_=sa.String(MAX_STRING_LENGTH)
          )
      with op.batch_alter_table("trial_user_attributes") as batch_op:
          batch_op.alter_column(
              "value_json", type_=sa.String(MAX_STRING_LENGTH)
          )
      with op.batch_alter_table("trial_system_attributes") as batch_op:
          batch_op.alter_column(
              "value_json", type_=sa.String(MAX_STRING_LENGTH)
          )
      with op.batch_alter_table("trial_params") as batch_op:
          batch_op.alter_column(
              "distribution_json", type_=sa.String(MAX_STRING_LENGTH)
          )
  
label_desc: Use image node_id 2 for calling a global function with example usage: downgrade() without return types