refactor(inventory): enhance error reporting for negative stock validation

database/migrations/2026_09_25_000000_generate_available_inventory_stock.php

@@ -52,8 +52,38 @@ return new class extends Migration
 
     private function assertNonNegative(string $expression, string $reason): void
     {
-        if (DB::table('inventories')->whereRaw("({$expression}) < 0")->exists()) {
-            throw new RuntimeException("Hay inventarios inconsistentes: {$reason}.");
+        $invalidInventories = DB::table('inventories')
+            ->select([
+                'id',
+                'real_stock',
+                'sold_units',
+                'refunded_units',
+                'reserved_stock',
+                'entry_reserved_stock',
+            ])
+            ->selectRaw("({$expression}) as calculated_stock")
+            ->whereRaw("({$expression}) < 0")
+            ->orderBy('id')
+            ->limit(20)
+            ->get();
+
+        if ($invalidInventories->isNotEmpty()) {
+            $details = $invalidInventories
+                ->map(static fn (object $inventory): string => sprintf(
+                    'id=%d [real=%d, vendidas=%d, reintegradas=%d, reservadas=%d, reservas_entradas=%d, resultado=%d]',
+                    $inventory->id,
+                    $inventory->real_stock,
+                    $inventory->sold_units,
+                    $inventory->refunded_units,
+                    $inventory->reserved_stock,
+                    $inventory->entry_reserved_stock,
+                    $inventory->calculated_stock,
+                ))
+                ->implode('; ');
+
+            throw new RuntimeException(
+                "Hay inventarios inconsistentes: {$reason}. Inventarios detectados (máximo 20): {$details}."
+            );
         }
     }
 };