Oniii-chan said:
This link doesn't work...
In regards to the links you provided, the following provides a bit more information on the cause of fault:
JSON Query
{"success": false, "message": "ERROR: canceling statement due to statement timeout\n"}
In contrast, this is a valid JSON query.
So however the data is being stored, the retrieval is taking longer than 9 seconds (for me) or 6 seconds (for you), which causes the error.
Also, I did a little testing, and many of the a<post_version> and b<post_version> around 15727166 cause a timeout as well. However, I also tested narrowing the search query, basically searching for all post versions above 15726166 but limited to posts I've updated, and the query still took a while but it reliably works (for me, see my mention of timeouts above).