Fix timespan compression in backend and add bandaid compressing to front-end

[philippotto]

There was a bug in the backend code which effectively disabled merging of neighboring time spans completely (annotation ids did never match due to missing casting).
This PR fixes that back end issue (thanks again, @youri-k, for finding this!) and adds a band-aid compression to the front-end (~ 9000 time entries are compressed to 9).

URL of deployed dev instance (used for testing):

• https://___.webknossos.xyz

Steps to test:

• I used a mock array with some time tracking data and duplicated this in code to test whether the compaction is fast (< 1 s even for 60 000 time entries)

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• also I spot checked that the compress function does reasonable things (especially, that the duration of all compressed time entries equals the duration of all uncompressed time entries)

Issues:

• contributes to Doublecheck loading speed for msem datasets #3311

---

• Updated changelog
• Ready for review

[daniel-wer]

LGTM, but let's still have a look at why the backend doesn't add up these entries. Afaics the tracingPauseInSeconds is configured to be 60s even. Or does the backend only use this to calculate the total time a user worked, but doesn't actually "compress" multiple time spans that are close together into one?

If there is an easy backend fix for this, I would prefer that instead of the frontend compression.

[philippotto]

If there is an easy backend fix for this, I would prefer that instead of the frontend compression.

I totally agree! However, from my understanding, the time spans were already added to the database in that way. So, if it's a bug, we can fix, we still need a way to compress these time spans somehow. But maybe the backend should do this.. I'll try to grab @youri-k today and investigate with him :)

[philippotto]

@daniel-wer @youri-k and I fixed the actual back end issue. I left the front-end compression in the PR, though, since migrating the existing time spans might be too much effort for too little gain right now.

Maybe @fm3 can gauge whether it's okay to leave the uncompressed spans in the db. In any way, we can do the migration always later.

[philippotto]

Also we tweaked the compression algorithm to compare the end timestamp (= timestamp + duration) of timespan A with the start timestamp with timespan B. Previously, only the start timestamps were compared 🙈

[daniel-wer]

Great fixes 🎉

[youri-k]

LGTM