code: def downgrade():
      pass
  
file_path: superset/superset/migrations/versions/2020-02-07_14-13_3325d4caccc8_dashboard_scoped_filters.py
imports: import json
  import logging
  from alembic import op
  from sqlalchemy import and_, Column, ForeignKey, Integer, String, Table, Text
  from sqlalchemy.ext.declarative import declarative_base
  from sqlalchemy.orm import relationship
  from superset import db
  from superset.utils.dashboard_filter_scopes_converter import convert_filter_scopes
label_desc: Use image node_id 2 for calling a global function with example usage: downgrade() without return types