docs: public boolean remove(DbEntity e) {
      Class<?> cacheKey = cacheKeyMapping.getEntityCacheKey(e.getClass());
      Map<String, CachedDbEntity> typeMap = cachedEntites.get(cacheKey);
      if(typeMap != null) {
        return typeMap.remove(e.getId()) != null;
      } else {
        return false;
      }
    }