class_docstr: Basic in-memory dict-based object for saving Task Records.
  
  This is the first object to present the DB interface
  for logging tasks out of memory.
  
  The interface is based on MongoDB, so adding a MongoDB
  backend should be straightforward.
docstr: Remove a record from the DB.
docstr_tok: ["Remove","a","record","from","the","DB","."]
code: def drop_matching_records(self, check):
      """Remove a record from the DB."""
      matches = self._match(check)
      for rec in matches:
          self._drop_bytes(rec)
          del self._records[rec["msg_id"]]
  
imports: import copy
  from copy import deepcopy
  from datetime import datetime
  from traitlets import Dict, Float, Integer, Unicode
  from traitlets.config.configurable import LoggingConfigurable
  from ..util import ensure_timezone
label_desc: Use image node_id 12 for calling the DictDB obj's underlying member method code with example usage: obj.drop_matching_records(check) without return types