R1:642113708a83

Build a rough transaction-level view of Feed

Summary:
Ref T13294. An install is interested in a way to easily answer audit-focused questions like "what edits were made to any Herald rule in Q1 2019?".

We can answer this kind of question with a more granular version of feed that focuses on being exhaustive rather than being human-readable.

This starts a rough version of it and deals with the two major tricky pieces: transactions are in a lot of different tables; and paging across them is not trivial.

To…