74ff236b51
Stable twin of #1204. The capture-date backfill committed its result keyed on the row id alone. It snapshots every candidate up front, then walks them one at a time reading originals off S3 or a NAS mount — a pass that can run for many minutes. replacePhoto, reachable from the replace_by_name upload path, swaps a NEW file under an existing row and rewrites path/filename. A replacement landing inside that window carries no date of its own, so captured_at was still NULL, the whereNull guard passed, and the previous file's EXIF date was written onto the new photo. Silent: nothing errored, the run reported it as a success, and the gallery just sorted that photo to the wrong place. Fenced on path and filename as well as the id, so a replaced row matches zero rows and is skipped. The candidate query already selects both columns, so no query change. Knex renders a null value in the object form as `is null` on both the pg and sqlite3 clients, so a row with a NULL path still matches itself. Those skipped candidates are now counted rather than dropped. replacePhoto is not the only writer of path/filename — eventRenameService rewrites both on an event rename, which is not a content change — and another writer filling captured_at first lands in the same place. Without a counter they fell out of the run's arithmetic entirely: success + noExif + failed no longer added up to the count the operator was shown when they started the job. The card shows the count only when it is non-zero, and states what is known — changed by something else, not updated — rather than promising a retry: for the already-dated case there is nothing to retry, and the Missing Capture Date figure above is what says whether work is left. Locale coverage: en, de, fr, sl, with the defaultValue carrying the rest. Regression test: a replacement landing mid-run leaves captured_at NULL and is not counted as updated. Verified to fail against the unfenced code on this branch.