private MapField<String, String> internalGetDetails() {
            if (details_ == null) {
                return MapField.emptyMapField(DetailsDefaultEntryHolder.defaultEntry);
            }
            return details_;
        }
<code>optional int64 timestamp = 3;</code>

@return This builder for chaining.
turms-server-common/src/main/java/im/turms/server/common/access/client/dto/model/user/UserLocation.java