Catch sqlite timeout & forward queries to CalCat

This should cope better if there are GPFS issues which mean the database stays locked for longer than it should (as we think caused https://redmine.xfel.eu/issues/163349 ).

Of course, if GPFS is very slow, that's likely to be a problem for calibration anyway, because the raw data, the output and the constants are all on GPFS. But this might help if there's a very temporary issue.

requested review from @schmidtp

Thanks, this LGTM.

Great, I'll merge this now. In order to actually put this into effect, we'd need to tag a version, update the version to install in pycalibration, and deploy. We'll probably want to do at least some of the end-to-end tests before it lands in production.

(Which reminds me, CalParrot is growing into enough complexity that I should really try to write some tests for it )

merged

mentioned in commit 57c656b5

mentioned in merge request pycalibration!928 (merged)