code: def rpc_get_name_at( self, name, block_height, **con_info ):
          
          if not check_name(name):
              return {'error': 'invalid name', 'http_status': 400}
  
          if not check_block(block_height):
              return self.success_response({'record': None})
  
          db = get_db_state(self.working_dir)
          names_at = db.get_name_at( name, block_height, include_expired=False )
          db.close()
          
          ret = []
          for name_rec in names_at:
              if 'opcode' not in name_rec:
                  name_rec['opcode'] = op_get_opcode_name(name_rec['op'])
              
              ret.append(self.sanitize_rec(name_rec))
  
          return self.success_response( {'records': ret} )
docs: Get all the states the name was in at a particular block height.
          Does NOT work on expired names.
          Return {'status': true, 'record': ...}