[BUG] Double uploads on Codecov UI

[webknjaz]

Describe the bug

Sometimes, when viewing uploads for a commit, duplicates are listed in the widget where one can inspect them.

If you look into the Coverage reports history widget @ https://app.codecov.io/gh/python-trio/trio/commit/4f66fabf5ca4c2dd40e4e9b76bc486a78483d159, there are 3 reports titled macOS (pypy-3.10). Hovering mouse cursor on their names will reveal that one was uploaded from https://github.com/python-trio/trio/actions/runs/12392561462 (merge_group-triggered GHA run) and the other two were uploaded from https://github.com/python-trio/trio/actions/runs/12392781287 (a CI run triggered by a push event that is something that happens once merge queues succeed).

At first, I thought that maybe that second one was re-run and these could be coming from two attempts. But that's not the case — the GHA workflow run is the same.

I thought that perhaps I should download the duplicate reports and run a diff to see if they have the same payload. But I didn't have to go that far!
Imagine my surprise when I hovered on the Download links for those two duplicate reports and realized that they point to the same URL… Bizarre!

To summarize, it seems there's some inconsistency / DB state corruption within Codecov's backend somewhere, as it shows two entries for what clearly is the same report upload from the same CI job.

To Reproduce

🤷‍♂

Expected behavior

One upload -> one report.

Screenshots

https://app.codecov.io/gh/python-trio/trio/commit/4f66fabf5ca4c2dd40e4e9b76bc486a78483d159

Additional context

python-trio/trio#3153 (comment)

[webknjaz]

@rohan-at-sentry @drazisil-codecov does the assessment seem correct?