Cleanup database at exit, use write-ahead logging

[samuel-w]

https://www.tutorialspoint.com/sqlite/sqlite_vacuum.htm

[m3nu]

We should look into async/await. Maybe some startup tasks can be offloaded.

[samuel-w]

Async is apparently slower for databases https://stackoverflow.com/questions/39803746/peewee-and-peewee-async-why-is-async-slower

[m3nu]

Is it worth making startup slower for this low-priority task? How about doing it in the background with the scheduler or when closing?

[samuel-w]

I moved it so it runs right before exiting.

[samuel-w]

Added write-ahead logging https://www.sqlite.org/wal.html. It speeds up tests a lot, 30 sec to 16 sec.

[samuel-w]

Strange. The tests aren't faster in the CI, but they are faster on my local machine. Still useful though.

[codecov-io]

Codecov Report

Merging #696 (364f301) into master (abd41b9) will increase coverage by 2.64%.
The diff coverage is 60.00%.

@@            Coverage Diff             @@
##           master     #696      +/-   ##
==========================================
+ Coverage   70.85%   73.50%   +2.64%     
==========================================
  Files          53       53              
  Lines        3507     3510       +3     
==========================================
+ Hits         2485     2580      +95     
+ Misses       1022      930      -92     

Impacted Files	Coverage Δ
src/vorta/__main__.py	0.00% <0.00%> (ø)
src/vorta/models.py	80.80% <50.00%> (+0.19%)	⬆️
src/vorta/application.py	58.08% <100.00%> (+0.31%)	⬆️
src/vorta/borg/borg_thread.py	79.28% <0.00%> (+1.77%)	⬆️
src/vorta/config.py	100.00% <0.00%> (+5.55%)	⬆️
src/vorta/network_status/abc.py	88.23% <0.00%> (+5.88%)	⬆️
src/vorta/utils.py	60.86% <0.00%> (+6.52%)	⬆️
src/vorta/keyring/abc.py	88.23% <0.00%> (+8.82%)	⬆️
src/vorta/notifications.py	84.84% <0.00%> (+13.63%)	⬆️
... and 3 more

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