From recent query on db01:
```
# Clear out of date site links
DELETE {
?s ?p ?o .
}
WHERE {
?s <http://schema.org/about> <http://www.wikidata.org/entity/Q13536649> .
?s ?p ?o .
# This construct is constantly reused throughout the updates. Its job is to not delete statements
# that are still in use.
FILTER NOT EXISTS {
VALUES ( ?s ?p ?o ) {
( <http://www.wikidata.org/reference/95541d0f0f90a1cf32daf28a8778388cea9185a1> <http://www.wikidata.org/prop/reference/value/P813> <http://www.wikidata.org/value/526c88f3ddf7fb39b97e4f3458b013fb> )
( <http://www.wikidata.org/value/526c88f3ddf7fb39b97e4f3458b013fb> <http://wikiba.se/ontology#timeValue> "2015-07-11T00:00:00Z"^^<http://www.w3.org/2001/XMLSchema#dateTime> )
( <http://www.wikidata.org/reference/95541d0f0f90a1cf32daf28a8778388cea9185a1> <http://www.wikidata.org/prop/reference/P813> "2015-07-11T00:00:00Z"^^<http://www.w3.org/2001/XMLSchema#dateTime> )
( <http://www.wikidata.org/reference/95541d0f0f90a1cf32daf28a8778388cea9185a1> <http://www.wikidata.org/prop/reference/P248> <http://www.wikidata.org/entity/Q82486> )
( <http://www.wikidata.org/value/526c88f3ddf7fb39b97e4f3458b013fb> <http://wikiba.se/ontology#timeTimezone> "0"^^<http://www.w3.org/2001/XMLSchema#integer> )
( <http://www.wikidata.org/value/526c88f3ddf7fb39b97e4f3458b013fb> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://wikiba.se/ontology#TimeValue> )
( <http://www.wikidata.org/value/526c88f3ddf7fb39b97e4f3458b013fb> <http://wikiba.se/ontology#timeCalendarModel> <http://www.wikidata.org/entity/Q1985727> )
( <http://www.wikidata.org/value/526c88f3ddf7fb39b97e4f3458b013fb> <http://wikiba.se/ontology#timePrecision> "11"^^<http://www.w3.org/2001/XMLSchema#integer> )
}
}
};
```
We should not be trying to match values or refs to sitelinks.