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`count_pr_mutations` treated an empty page past page 1 as proof it had reached the end of the PR timeline. Gitea does not mean that: `ListIssueCommentsAndTimeline` applies the LIMIT/OFFSET in `FindComments` at the DATABASE level and filters AFTERWARDS, dropping `CommentTypeCode` rows and inaccessible cross-references into a nil slice that serializes as bare `null`. A page of 50 inline review comments is byte-identical to a page past the end while later pages still hold events, and rows are ASCENDING, so the events a fence looks for are the furthest from page 1. Fifty comments, which a PR author can create on their own PR, truncated both walks at the same place: both counts agreed, the sha comparison agreed, and an ABA force-push yielded an exemption `success` over a diff no single head justified. The walk no longer infers the end from an empty page BEFORE its cap. Such a page is skipped; the loop reads every page to its 20-page cap and trusts the counts only when the LAST page came back empty. An empty FIRST page and any unreadable shape still end the walk untrusted. NARROWED, NOT CLOSED, and the docs say so in one unit: the page-20 terminator is still trusted for the same unprovable reason, so the defeat now costs a timeline of over 1000 rows rather than ~100, with the same 50-row filtered block pinned to offsets 950..999. Measured at Gitea 1.27.1, ruling out the cheaper fixes: `X-Total-Count` on this endpoint is the post-filter length of the PAGE, not a total (`?limit=1` returns 1 on a 14-row timeline), while `/activities/feeds` returns a true total; `limit` clamps to 50; the only query params are `since`, `before`, `page`, `limit`, so the paged and serialized sets cannot be made to agree. Also: each page bounded `--connect-timeout 5 --max-time 15` and retried once, mirroring `page_statuses`, because the walk went from ~2 requests to a fixed 20 and the third call site runs after the exemption `success` is posted. Costs stated rather than hidden — worst case 40 requests and 20 sleeps, wall-clock pessimum 620s per walk, and the suite roughly doubled (202s -> 474s). Seven tests, each mutation-witnessed red; three reproduce the defeat against the shipped predecessor. Two independent cold reviews plus a re-review of the fix: no Blocker or High in the code. Their real finding was prose claiming the hole was closed, and cost arithmetic wrong twice. One reviewer claim was refuted by execution. Fixes #870 Refs: #803, #706, #664, #751, #893 Decisions-Edit: yes Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Co-authored-by: Timothy <timothy@noreply.gitea.tblindustries.be>