made some initial notes to orient myself: https://docs.google.com/document/d/1LJ7WdffcdHYcSObpC-zK4JYOI-tRWj8W1bGUNjD2jrQ/edit?usp=sharing

sounds good to me, the latest draft: https://www.wikidata.org/w/index.php?title=User%3AKimphamWMDE%2Fgraphql-202605&diff=2498221783&oldid=2495399278

updated: https://www.wikidata.org/w/index.php?title=User%3AKimphamWMDE%2Fgraphql-202605&diff=2497715493&oldid=2495399278

Draft of documentation updates: https://www.wikidata.org/w/index.php?title=User%3AKimphamWMDE%2Fgraphql-202605&diff=2497199602&oldid=2495399278

steps that can be used to test gerrit change:

1. fork repo of https://github.com/wikimedia/mediawiki-extensions-Wikibase
2. apply edits from the gerrit change https://gerrit.wikimedia.org/r/c/mediawiki/extensions/Wikibase/+/1289899 to the master branch of the forked repo
3. in Actions tab review workflow "Wikibase Secondary CI API Testing without OpenSearch"

The state timeline isn't totally necessary, and kind of redundant to the time series, but it might be useful to see quickly exactly when the api was used or when you get error spikes without the overlapping lines of the time series

query {

item(id: "Q1") {
  label(languageCode:"en")
  statements(propertyId: "P10") {
    value {
      ... on TabularValue {
        content
        url
      }
    }
  }
}

}

steps to test

1. pull code
2. create a property e.g. viaf as data type external identifier
3. create a property e.g. your formatter url as data type string
4. put https://viaf.org/viaf/$1 on that formatter url property
5. put $wgWBRepoSettings['formatterUrlProperty'] = 'P1630'; // your formatter url property ID for external IDs
6. clear cache.

?action=purge

value {

      ... on StringValue {
        content
      }
    }
  }
}

}

results in

examples
tabular case data commons media exti-w https://www.wikidata.org/wiki/Q84146057

some fields are not yet available, e.g.