Remove pulls trigger

[nora-codecov]

Part of the quest to reduce locks by eliminating triggers https://github.com/codecov/internal-issues/issues/1029

The trigger is deleted by these changes. The behavior is replaced in a cron job on worker codecov/worker#947.

What the trigger did: every time a pull was updated, if it was transitioning from OPEN to any other state, it set the flare field to null.
flare is an Archive field, so the value is either in _flare on the object or in our Archive storage.

Replacement behavior: see FlareCleanupTask codecov/worker#947
Once the trigger is removed, when the pull transitions from OPEN to any other state, leave flare alone in order to reduce locks and wait time.
The cron job runs overnight, gets all pulls that are non-OPEN and have flare (either in our db or in Archive storage), clears it (either in our db or in Archive storage) so flare is null.

more about flare:

• see the docstring I added on should_write_to_storage
• see Flare: what is it good for - absolutely nothing? codecov-api#999 and my summary of the findings in https://github.com/codecov/internal-issues/issues/1029

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.98%. Comparing base (abc6b36) to head (2e54905).

❗ Current head 2e54905 differs from pull request most recent head 96d0b0c

Please upload reports for the commit 96d0b0c to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #450      +/-   ##
==========================================
- Coverage   90.58%   89.98%   -0.60%     
==========================================
  Files         401      324      -77     
  Lines       12508     9216    -3292     
  Branches     2103     1636     -467     
==========================================
- Hits        11330     8293    -3037     
+ Misses       1069      860     -209     
+ Partials      109       63      -46     

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[Swatinem]

I’m unsure related to the should_write_to_storage changes. I don’t think those are needed necessarily?

[Swatinem]

this would rather mean that the flare is being stored in the JSON field of the table.
I’m unsure what would happen if you change this value based on the state. will is copy over data from storage to the database? or will that only happen if you save a new value in the field?

[nora-codecov]

good call - I think I was thinking that if this came back False it wouldn't be saved anywhere, but you're right, this would just force it onto the db field. Removing.