#4781: the nightly auto-close is on the record too

`ticketing:auto-close` closed tickets with a single bulk UPDATE, which
fires no model events. With the audit declaration in place that left one
way of closing a ticket invisible: the Changes log would show a ticket
going open → resolved and then nothing, while the row itself read
`closed`. "Who closed this" is the question the trail exists to answer and
"the nightly sweep did" is a real answer — but only if the sweep writes it.

Closed one at a time through the model, chunked by id so a first sweep
over a backlog does not load every resolved ticket at once. Paging by id
is what makes that safe while the filtered column is being written.

src/Console/Commands/AutoCloseTickets.php

@@ -22,9 +22,39 @@ class AutoCloseTickets extends Command
 
         $cutoff = now()->subDays($days);
 
-        $count = Ticket::where('status', 'resolved')
+        /*
+         * CLOSED ONE AT A TIME, THROUGH THE MODEL — [central-ticketing] #4781.
+         *
+         * This was a single `->update(['status' => 'closed'])`, which is one
+         * statement and no model events. Since #4781 a ticket's status change is
+         * an audited fact, and a bulk update would have left exactly one way of
+         * closing a ticket invisible: the Changes log would show a ticket going
+         * open → resolved and then nothing, while the row itself said `closed`.
+         * "Who closed this" is the question the audit trail exists to answer,
+         * and "the nightly sweep did, on this date" is a real answer — but only
+         * if the sweep writes it.
+         *
+         * Per-ticket rather than one summary event because the answer has to be
+         * on THE TICKET: the per-record history panel reads rows whose subject
+         * is that ticket, and an aggregate "closed 14 tickets" row would not
+         * appear in any of their histories.
+         *
+         * `chunkById`, so a first sweep over a long backlog does not load every
+         * resolved ticket into memory at once. Paging by id is what makes this
+         * safe while the filtered column is being written: each page continues
+         * from the last id seen rather than from an offset, so rows dropping out
+         * of `status = 'resolved'` cannot cause a page to be skipped.
+         */
+        $count = 0;
+
+        Ticket::where('status', 'resolved')
             ->where('updated_at', '<=', $cutoff)
-            ->update(['status' => 'closed']);
+            ->chunkById(200, function ($tickets) use (&$count) {
+                foreach ($tickets as $ticket) {
+                    $ticket->forceFill(['status' => 'closed'])->save();
+                    $count++;
+                }
+            });
 
         $this->info("Auto-closed {$count} ticket(s) resolved more than {$days} day(s) ago.");