Restbase requests to wikidata for HTML content of wikitext pages (such user pages) fails with HTTP status code 500.
**Steps to replicate the issue** (include links if applicable):
* Go to e.g. https://www.wikidata.org/api/rest_v1/page/html/User:Count%20Count%2Fsandbox or https://www.wikidata.org/api/rest_v1/page/html/User:XXBlackburnXx%2Fsandbox/2170429102?redirect=false
**What happens?**:
HTTP status 500 with an error like this
```
{"type":"https://mediawiki.org/wiki/HyperSwitch/errors/query_error","title":"Error in Cassandra table storage backend","method":"get","uri":"/www.wikidata.org/v1/page/html/User%3AXXBlackburnXx%2Fsandbox/2170429102"}
```
**What should have happened instead?**:
The HTML content
**Software version** (on `Special:Version` page; skip for WMF-hosted wikis like Wikipedia):
**Other information** (browser name/version, screenshots, etc.):
Last time this worked was apparently on May 7 according to the [spamcheck](https://spamcheck.toolforge.org) database:
```
MariaDB [s55543__xlinks_p]> select rev_timestamp from revision, db where rev_db = db_id and db_name='wikidatawiki' order by rev_id desc limit 3;
+---------------------+
| rev_timestamp |
+---------------------+
| 2024-05-07 09:00:15 |
| 2024-05-07 08:55:28 |
| 2024-05-07 08:54:16 |
+---------------------+
3 rows in set (0.250 sec)
```