code: def downgrade():
      # It's Okay to keep these columns as MEDIUMTEXT
      # Since some oraganizations may have already manually changed the type
      # and downgrade may loose data so we don't do it.
      pass
  
imports: from alembic import op
  from sqlalchemy.dialects.mysql.base import MySQLDialect
label_desc: Use image node_id 2 for calling a global function with example usage: downgrade() without return types