#4781: the bulk merged-repair is on the record too

MergedTicketRepair::repairAll() re-marks tickets as merged (permanently
read-only) per model instead of with one builder update, so each frozen
ticket gets its own Changes-log entry — the same as the per-ticket button.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/Support/MergedTicketRepair.php

@@ -84,17 +84,22 @@ class MergedTicketRepair
      */
     public static function repairAll(string $by): int
     {
-        $numbers = Ticket::query()->inconsistentlyMerged()->pluck('number')->all();
+        $tickets = Ticket::query()->inconsistentlyMerged()->orderBy('id')->get();
 
-        if ($numbers === []) {
+        if ($tickets->isEmpty()) {
             Log::info("[ticketing] #938 merged-ticket repair ({$by}): nothing to repair.");
 
             return 0;
         }
 
-        $changed = Ticket::query()->inconsistentlyMerged()->update([
-            'status' => Ticket::STATUS_MERGED,
-        ]);
+        // Per model, not one builder update (#4781/#4807): `merged` makes a ticket
+        // permanently read-only, and a bulk statement would freeze it with nothing
+        // on the Changes log — while repair() below, the same change one ticket at
+        // a time, is recorded.
+        $tickets->each(fn (Ticket $ticket) => $ticket->forceFill(['status' => Ticket::STATUS_MERGED])->save());
+
+        $numbers = $tickets->pluck('number')->all();
+        $changed = $tickets->count();
 
         // The numbers, not just the count. These rows are being made read-only,
         // and "which ones" is the question the office will ask afterwards.