[Bug]: Bitbucket sends 5 requests per pull request on every sync #27578

Before submitting

• I searched existing issues and did not find a duplicate.
• I included enough detail to reproduce or investigate the problem.

Area

apps/server

Steps to reproduce

1. Configure Bitbucket Cloud credentials and link several Bitbucket pull requests to threads.
2. Leave the server running.
3. Count the Bitbucket requests under each PullRequestSyncReactor.sweep in server.trace.ndjson.

Expected behavior

A sync reads the pull requests it needs in a few requests. Repository permission is read once per repository, not once per pull request, and diffstat and conflicts are reread only when the head commit changes. One GET /repositories/{workspace}/{repo}/pullrequests returns each pull request's state, updated_on and head commit, which is enough to tell which ones changed.

Actual behavior

Bitbucket's getChangeRequest sends 5 requests for every pull request: the pull request, diffstat, conflicts, statuses and repository permission. GitHub batches pull request reads into one GraphQL request; Bitbucket reads each pull request separately.

With 12 linked pull requests and the one-minute retry from #17799, that is about 3,600 requests an hour. Bitbucket allows 1,000 an hour for most endpoints, so the host stays paused (#23885) and every Bitbucket feature fails.

Impact

Major degradation or frequent failure

Version or commit

0.1.6-nightly.20261030.3917

Environment

Linux x64, desktop AppImage, Bitbucket Cloud

Logs or stack traces

PullRequestProviderError: bitbucket failed in getChangeRequest: bitbucket requests to bitbucket.org are paused until the rate limit resets.

Workaround

Unlink Bitbucket pull requests you don't need, especially on settled threads.