text: -- Updating target field on any existing Filing from source table and column
  UPDATE opencivicdata_filing
  SET 
      {target_column} = {source_table}.{source_column},
      updated_at = now()
  FROM opencivicdata_filing f
  -- join to FilingIdentifier to get calaccess_filing_id 
  JOIN opencivicdata_filingidentifier fi
  ON f.id = fi.filing_id
  AND fi.scheme = 'calaccess_filing_id'
  -- then join to source_table
  JOIN {source_table}
  ON {source_table}.filing_id = fi.identifier::int
  -- filter down to only values that need to be updated
  WHERE f.{target_column} <> {source_table}.{source_column};
  