Fix oldest LSN calculation for WAL segments removal when slots are advancing during checkpoint

When Who What
2026-02-03 22:29:27 Álvaro Herrera (alvherre) Closed in commitfest PG19-1 with status: Committed
2026-02-03 22:29:27 Álvaro Herrera (alvherre) Changed committer to smagen
2026-02-03 22:29:19 Álvaro Herrera (alvherre) Attached mail thread CAPpHfdvuyMrUg0Vs5jPfwLOo1M9B-GP5j_My9URnBX0B=nrHKw@mail.gmail.com
2025-07-08 02:38:24 CFbot Patch needs rebase
2025-06-30 02:38:06 Hayato Kuroda (ha-kun) Removed ha-kun from reviewers
2025-06-30 02:36:58 Hayato Kuroda (ha-kun) Added ha-kun as reviewer
2025-06-29 06:39:51 CFbot Patch does not need rebase anymore
2025-06-28 06:50:38 CFbot Patch needs rebase
2025-05-21 19:11:35 CFbot Patch does not need rebase anymore
2025-05-20 00:32:29 CFbot Patch needs rebase
2025-03-03 16:35:05 Vitaly Davydov (vitprof) New status: Needs review
2025-03-03 14:56:05 Vitaly Davydov (vitprof) New status: Waiting on Author
2025-03-03 14:54:57 Vitaly Davydov (vitprof) Changed authors to Vitaly Davydov (vitprof)
2025-03-03 14:53:27 Vitaly Davydov (vitprof) Attached mail thread 1d12d2-67235980-35-19a406a0@63439497
2025-03-03 14:53:27 Vitaly Davydov (vitprof) Created patch record