code: def namedb_is_name_zonefile_hash(cur, name, zonefile_hash):
      
      select_query = 'SELECT COUNT(value_hash) FROM history WHERE history_id = ? AND value_hash = ?'
      select_args = (name,zonefile_hash)
  
      rows = namedb_query_execute(cur, select_query, select_args)
      count = None
  
      for r in rows:
          count = r['COUNT(value_hash)']
          break
  
      return count > 0
docs: Determine if a zone file hash was sent by a name.
      Return True if so, false if not