fix(ticket): guard legacy refund amount removal

database/migrations/2026_09_14_040000_remove_refunded_amount_from_purchase_items.php

@@ -2,12 +2,32 @@
 
 use Illuminate\Database\Migrations\Migration;
 use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\DB;
 use Illuminate\Support\Facades\Schema;
 
 return new class extends Migration
 {
     public function up(): void
     {
+        $mismatchedItem = DB::table('compra_items as purchase_items')
+            ->leftJoin('ticket_refunds as refunds', 'refunds.purchase_item_id', '=', 'purchase_items.id')
+            ->where('purchase_items.refunded_amount', '>', 0)
+            ->groupBy('purchase_items.id', 'purchase_items.refunded_amount')
+            ->selectRaw(
+                'purchase_items.id, purchase_items.refunded_amount, COALESCE(SUM(refunds.amount), 0) as refund_total'
+            )
+            ->get()
+            ->first(fn (object $item): bool => abs(
+                (float) $item->refunded_amount - (float) $item->refund_total
+            ) > 0.005);
+
+        if ($mismatchedItem !== null) {
+            throw new RuntimeException(
+                "No se puede eliminar compra_items.refunded_amount: el ítem {$mismatchedItem->id} "
+                .'contiene un importe histórico que no está respaldado por ticket_refunds.'
+            );
+        }
+
         Schema::table('compra_items', function (Blueprint $table): void {
             $table->dropColumn('refunded_amount');
         });
@@ -18,5 +38,15 @@ return new class extends Migration
         Schema::table('compra_items', function (Blueprint $table): void {
             $table->decimal('refunded_amount', 10, 2)->default(0)->after('total');
         });
+
+        DB::table('ticket_refunds')
+            ->selectRaw('purchase_item_id, SUM(amount) as refund_total')
+            ->groupBy('purchase_item_id')
+            ->orderBy('purchase_item_id')
+            ->eachById(function (object $refund): void {
+                DB::table('compra_items')
+                    ->where('id', $refund->purchase_item_id)
+                    ->update(['refunded_amount' => $refund->refund_total]);
+            }, column: 'purchase_item_id');
     }
 };