docs(stock): document centralized reservation flow

app/Domains/Cart/Models/Cart.php

@@ -5,6 +5,7 @@ namespace App\Domains\Cart\Models;
 use App\Domains\Auth\Models\User;
 use App\Domains\Catalog\Models\CatalogItem;
 use App\Domains\Catalog\Models\Inventory;
+use App\Domains\Catalog\Models\StockReservation;
 use App\Domains\Catalog\Models\Variant;
 use App\Domains\Catalog\Services\CatalogInventoryService;
 use App\Domains\Catalog\Services\StockReservationService;
@@ -28,6 +29,7 @@ use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
     'status',
     'origin',
     'current_purchase_id',
+    'current_stock_reservation_id',
 ])]
 class Cart extends Model
 {
@@ -45,6 +47,7 @@ class Cart extends Model
         return [
             'user_id' => 'integer',
             'current_purchase_id' => 'integer',
+            'current_stock_reservation_id' => 'integer',
         ];
     }
 
@@ -84,6 +87,15 @@ class Cart extends Model
         return $this->belongsTo(Purchase::class, 'current_purchase_id');
     }
 
+    /** @return BelongsTo<StockReservation, $this> */
+    public function currentStockReservation(): BelongsTo
+    {
+        return $this->belongsTo(
+            StockReservation::class,
+            'current_stock_reservation_id',
+        );
+    }
+
     public function getTotalAmount(): float
     {
         $items = $this->relationLoaded('items')
@@ -140,12 +152,11 @@ class Cart extends Model
                     'cantidad' => $quantity,
                 ]);
             } else {
-                app(StockReservationService::class)->ensure($item, $selectedItem);
                 $item->cantidad += $quantity;
                 $item->save();
             }
 
-            app(StockReservationService::class)->reserve($item, $selectedItem, $quantity);
+            app(StockReservationService::class)->syncCart($this);
 
             return $item->fresh();
         });
@@ -205,7 +216,6 @@ class Cart extends Model
                     $nextAvailableQuantity,
                 );
 
-                app(StockReservationService::class)->release($item, $currentSelection, $item->cantidad);
                 $availableQuantity = $inventoryService->availableQuantity($nextSelection);
 
                 if ($availableQuantity !== null && $availableQuantity < $quantity) {
@@ -222,11 +232,10 @@ class Cart extends Model
                     ->first();
 
                 if ($targetItem !== null) {
-                    app(StockReservationService::class)->ensure($targetItem, $nextSelection);
                     $targetItem->cantidad += $quantity;
                     $targetItem->save();
-                    app(StockReservationService::class)->reserve($targetItem, $nextSelection, $quantity);
                     $item->delete();
+                    app(StockReservationService::class)->syncCart($this);
 
                     return $targetItem->fresh();
                 }
@@ -234,7 +243,7 @@ class Cart extends Model
                 $item->variant_id = $variantId;
                 $item->cantidad = $quantity;
                 $item->save();
-                app(StockReservationService::class)->reserve($item, $nextSelection, $quantity);
+                app(StockReservationService::class)->syncCart($this);
 
                 return $item->fresh();
             }
@@ -263,16 +272,9 @@ class Cart extends Model
                 ]);
             }
 
-            if ($delta > 0) {
-                app(StockReservationService::class)->reserve($item, $currentSelection, $delta);
-            }
-
-            if ($delta < 0) {
-                app(StockReservationService::class)->release($item, $currentSelection, abs($delta));
-            }
-
             $item->cantidad = $quantity;
             $item->save();
+            app(StockReservationService::class)->syncCart($this);
 
             return $item->fresh();
         });
@@ -289,17 +291,8 @@ class Cart extends Model
                 ->lockForUpdate()
                 ->firstOrFail();
 
-            $selectedItem = $this->resolveScopedItem(
-                $item->catalog_item_id,
-                $item->variant_id,
-                true,
-            );
-            app(StockReservationService::class)->release(
-                $item,
-                $selectedItem,
-                $item->cantidad,
-            );
             $item->delete();
+            app(StockReservationService::class)->syncCart($this);
         });
     }
 
@@ -347,7 +340,10 @@ class Cart extends Model
             ]);
         }
 
-        app(StockReservationService::class)->detachFromPurchase($currentPurchase);
+        app(StockReservationService::class)->releaseForPurchase(
+            $currentPurchase,
+            reason: StockReservationService::REASON_PURCHASE_SUPERSEDED,
+        );
         self::query()
             ->whereKey($cart->getKey())
             ->where('current_purchase_id', $currentPurchase->getKey())

app/Domains/Cart/Models/CartItem.php

@@ -3,13 +3,11 @@
 namespace App\Domains\Cart\Models;
 
 use App\Domains\Catalog\Models\CatalogItem;
-use App\Domains\Catalog\Models\StockReservation;
 use App\Domains\Catalog\Models\Variant;
 use Illuminate\Database\Eloquent\Attributes\Fillable;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
-use Illuminate\Database\Eloquent\Relations\HasMany;
 
 #[Fillable([
     'cart_id',
@@ -57,10 +55,4 @@ class CartItem extends Model
     {
         return $this->variant ?? $this->catalogItem;
     }
-
-    /** @return HasMany<StockReservation, $this> */
-    public function stockReservations(): HasMany
-    {
-        return $this->hasMany(StockReservation::class);
-    }
 }

app/Domains/Cart/Services/ExpireCartReservationsService.php

@@ -3,119 +3,82 @@
 namespace App\Domains\Cart\Services;
 
 use App\Domains\Cart\Models\Cart;
-use App\Domains\Cart\Models\CartItem;
-use App\Domains\Catalog\Models\Inventory;
 use App\Domains\Catalog\Models\StockReservation;
+use App\Domains\Catalog\Services\StockReservationService;
+use App\Domains\Purchase\Models\Purchase;
 use Illuminate\Support\Facades\DB;
 
 class ExpireCartReservationsService
 {
+    public function __construct(
+        private readonly StockReservationService $reservations,
+    ) {}
+
     public function expireOverdue(): int
     {
-        $expiredItems = 0;
+        $expired = 0;
-        $lastCartItemId = 0;
+        $lastReservationId = 0;
 
         do {
-            $cartItemIds = StockReservation::query()
+            $reservationIds = StockReservation::query()
                 ->where('status', StockReservation::STATUS_ACTIVE)
-                ->whereNull('purchase_id')
-                ->whereNotNull('cart_item_id')
                 ->whereNotNull('expires_at')
                 ->where('expires_at', '<=', now())
-                ->where('cart_item_id', '>', $lastCartItemId)
+                ->where('id', '>', $lastReservationId)
-                ->whereHas('cartItem.cart', fn ($query) => $query->where('status', 'active'))
+                ->whereHas('currentCart', fn ($query) => $query->where('status', 'active'))
-                ->select('cart_item_id')
+                ->whereDoesntHave('purchase', fn ($query) => $query->whereIn('status', [
-                ->distinct()
+                    Purchase::STATUS_CREATED,
-                ->orderBy('cart_item_id')
+                    Purchase::STATUS_PENDING_PAYMENT,
+                    Purchase::STATUS_IN_REVIEW,
+                ]))
+                ->orderBy('id')
                 ->limit(500)
-                ->pluck('cart_item_id');
+                ->pluck('id');
 
-            foreach ($cartItemIds as $cartItemId) {
+            foreach ($reservationIds as $reservationId) {
-                $lastCartItemId = (int) $cartItemId;
+                $lastReservationId = (int) $reservationId;
 
-                if ($this->expireCartItem($lastCartItemId)) {
+                if ($this->expireReservation($lastReservationId)) {
-                    $expiredItems++;
+                    $expired++;
                 }
             }
-        } while ($cartItemIds->count() === 500);
+        } while ($reservationIds->count() === 500);
 
-        return $expiredItems;
+        return $expired;
     }
 
-    private function expireCartItem(int $cartItemId): bool
+    private function expireReservation(int $reservationId): bool
     {
-        /** @var CartItem|null $candidate */
+        $cartId = Cart::query()
-        $candidate = CartItem::query()->select(['id', 'cart_id'])->find($cartItemId);
+            ->where('current_stock_reservation_id', $reservationId)
-        if ($candidate === null) {
+            ->where('status', 'active')
+            ->value('id');
+        if ($cartId === null) {
             return false;
         }
 
-        return DB::transaction(function () use ($candidate, $cartItemId): bool {
+        return DB::transaction(function () use ($cartId, $reservationId): bool {
             /** @var Cart|null $cart */
             $cart = Cart::query()
-                ->whereKey($candidate->cart_id)
+                ->whereKey($cartId)
+                ->where('current_stock_reservation_id', $reservationId)
                 ->where('status', 'active')
                 ->lockForUpdate()
                 ->first();
-
             if ($cart === null) {
                 return false;
             }
 
-            /** @var CartItem|null $cartItem */
+            /** @var StockReservation|null $reservation */
-            $cartItem = $cart->items()
+            $reservation = StockReservation::query()->lockForUpdate()->find($reservationId);
-                ->whereKey($cartItemId)
+            if ($reservation === null
-                ->lockForUpdate()
+                || $reservation->status !== StockReservation::STATUS_ACTIVE
-                ->first();
+                || $reservation->expires_at === null
-
+                || $reservation->expires_at->isFuture()) {
-            if ($cartItem === null) {
                 return false;
             }
 
-            $reservations = StockReservation::query()
+            $this->reservations->expire($reservation);
-                ->where('cart_item_id', $cartItem->getKey())
-                ->where('status', StockReservation::STATUS_ACTIVE)
-                ->orderBy('inventory_id')
-                ->lockForUpdate()
-                ->get();
-
-            if (
-                $reservations->isEmpty()
-                || $reservations->contains(
-                    fn (StockReservation $reservation): bool => $reservation->purchase_id !== null
-                        || $reservation->expires_at === null
-                        || $reservation->expires_at->isFuture(),
-                )
-            ) {
-                return false;
-            }
-
-            $inventories = Inventory::query()
-                ->whereKey($reservations->pluck('inventory_id'))
-                ->orderBy('id')
-                ->lockForUpdate()
-                ->get()
-                ->keyBy('id');
-
-            foreach ($reservations as $reservation) {
-                $inventory = $inventories->get($reservation->inventory_id)
-                    ?? throw new \InvalidArgumentException('No se encontro el inventario reservado.');
-
-                $inventory->release((int) $reservation->quantity);
-                $reservation->update([
-                    'quantity' => 0,
-                    'status' => StockReservation::STATUS_EXPIRED,
-                    'expires_at' => null,
-                    'released_at' => now(),
-                ]);
-            }
-
-            $cartItem->delete();
-
-            if (! $cart->items()->exists()) {
-                $cart->update(['status' => 'expired']);
-                $cart->delete();
-            }
 
             return true;
         });

app/Domains/Cart/documentacion/README.md

@@ -6,13 +6,13 @@ Gestiona el carrito activo de un tenant tanto para visitantes como para usuarios
 
 ## Modelo
 
-- `Cart`: pertenece a un tenant y opcionalmente a un usuario; calcula el total y permite agregar, actualizar o quitar ítems.
+- `Cart`: pertenece a un tenant y opcionalmente a un usuario; calcula el total, permite agregar, actualizar o quitar ítems y apunta a su reserva de stock vigente mediante `current_stock_reservation_id`.
 - `CartItem`: referencia un `CatalogItem` y, opcionalmente, una `Variant`; sólo persiste la selección y cantidad, y expone siempre los datos vigentes del catálogo.
 
 ## Servicios
 
 - `CartService`: obtiene el carrito, modifica ítems y administra la cookie del token invitado.
-- `ExpireCartReservationsService`: libera las reservas vencidas de carritos activos y elimina los carritos que quedan vacíos.
+- `ExpireCartReservationsService`: libera como conjunto las reservas vencidas de carritos activos sin eliminar el contenido del carrito.
 - `GuestCartMergeService`: incorpora el carrito invitado al usuario cuando este se autentica.
 
 ## Endpoints
@@ -34,4 +34,6 @@ Depende de `Catalog` para productos y variantes, de `Tenant` para aislar datos y
 
 Un carrito puede pasar a `checkout`. Las compras directas usan un carrito técnico con `origin=direct_checkout`; los carritos normales conservan `origin=user` y pueden restaurarse al cancelar o vencer la compra.
 
-El comando unificado `php artisan reservations:expire` procesa primero las compras vencidas y luego las reservas activas sin compra cuyo `expires_at` haya vencido. Se ejecuta cada minuto mediante el scheduler, conserva la fila de reserva con estado `expired`, elimina el ítem abandonado y elimina lógicamente el carrito cuando queda vacío. Cada intento registra sus resultados o su error en el log diario `storage/logs/commands/commands-AAAA-MM-DD.log`.
+Cada edición sincroniza una única reserva para el carrito completo. Si varios ítems o bundles consumen el mismo inventario, se persiste una sola línea con la cantidad agregada. Al editar durante checkout, la compra anterior queda `superseded`, su reserva se libera con el motivo correspondiente y se crea otra para el carrito actualizado.
+
+El comando unificado `php artisan reservations:expire` procesa primero las compras vencidas y luego las reservas activas de carrito cuyo `expires_at` haya vencido. Se ejecuta cada minuto mediante el scheduler, conserva la reserva y sus líneas como historial, libera el stock como conjunto y deja intactos el carrito y sus ítems.

app/Domains/Catalog/Models/Inventory.php

@@ -48,10 +48,10 @@ class Inventory extends Model
         return $this->hasOne(Variant::class);
     }
 
-    /** @return HasMany<StockReservation, $this> */
+    /** @return HasMany<StockReservationLine, $this> */
-    public function stockReservations(): HasMany
+    public function stockReservationLines(): HasMany
     {
-        return $this->hasMany(StockReservation::class);
+        return $this->hasMany(StockReservationLine::class);
     }
 
     public function availableStock(): int

app/Domains/Catalog/Models/StockReservation.php

@@ -2,21 +2,20 @@
 
 namespace App\Domains\Catalog\Models;
 
-use App\Domains\Cart\Models\CartItem;
+use App\Domains\Cart\Models\Cart;
 use App\Domains\Purchase\Models\Purchase;
 use Illuminate\Database\Eloquent\Attributes\Fillable;
 use Illuminate\Database\Eloquent\Model;
-use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+use Illuminate\Database\Eloquent\Relations\HasOne;
 
 #[Fillable([
-    'inventory_id',
-    'cart_item_id',
-    'purchase_id',
-    'quantity',
     'status',
     'expires_at',
     'committed_at',
     'released_at',
+    'expired_at',
+    'release_reason',
 ])]
 class StockReservation extends Model
 {
@@ -31,31 +30,28 @@ class StockReservation extends Model
     protected function casts(): array
     {
         return [
-            'inventory_id' => 'integer',
-            'cart_item_id' => 'integer',
-            'purchase_id' => 'integer',
-            'quantity' => 'integer',
             'expires_at' => 'datetime',
             'committed_at' => 'datetime',
             'released_at' => 'datetime',
+            'expired_at' => 'datetime',
         ];
     }
 
-    /** @return BelongsTo<Inventory, $this> */
+    /** @return HasMany<StockReservationLine, $this> */
-    public function inventory(): BelongsTo
+    public function lines(): HasMany
     {
-        return $this->belongsTo(Inventory::class);
+        return $this->hasMany(StockReservationLine::class);
     }
 
-    /** @return BelongsTo<CartItem, $this> */
+    /** @return HasOne<Cart, $this> */
-    public function cartItem(): BelongsTo
+    public function currentCart(): HasOne
     {
-        return $this->belongsTo(CartItem::class);
+        return $this->hasOne(Cart::class, 'current_stock_reservation_id');
     }
 
-    /** @return BelongsTo<Purchase, $this> */
+    /** @return HasOne<Purchase, $this> */
-    public function purchase(): BelongsTo
+    public function purchase(): HasOne
     {
-        return $this->belongsTo(Purchase::class);
+        return $this->hasOne(Purchase::class);
     }
 }

app/Domains/Catalog/Models/StockReservationLine.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace App\Domains\Catalog\Models;
+
+use Illuminate\Database\Eloquent\Attributes\Fillable;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+#[Fillable([
+    'stock_reservation_id',
+    'inventory_id',
+    'quantity',
+    'tracks_inventory',
+])]
+class StockReservationLine extends Model
+{
+    protected function casts(): array
+    {
+        return [
+            'stock_reservation_id' => 'integer',
+            'inventory_id' => 'integer',
+            'quantity' => 'integer',
+            'tracks_inventory' => 'boolean',
+        ];
+    }
+
+    /** @return BelongsTo<StockReservation, $this> */
+    public function reservation(): BelongsTo
+    {
+        return $this->belongsTo(StockReservation::class, 'stock_reservation_id');
+    }
+
+    /** @return BelongsTo<Inventory, $this> */
+    public function inventory(): BelongsTo
+    {
+        return $this->belongsTo(Inventory::class);
+    }
+}

app/Domains/Catalog/Services/CatalogInventoryService.php

@@ -25,6 +25,24 @@ class CatalogInventoryService
         );
     }
 
+    /**
+     * @return array<int, array{quantity: int, tracks_inventory: bool}>
+     */
+    public function detailedRequirementsFor(CatalogItem|Variant $selection, int $quantity = 1): array
+    {
+        if ($quantity <= 0) {
+            throw new \InvalidArgumentException('La cantidad debe ser mayor a cero.');
+        }
+
+        return array_map(
+            fn (array $requirement): array => [
+                ...$requirement,
+                'quantity' => $requirement['quantity'] * $quantity,
+            ],
+            $this->inventoryRequirements($selection),
+        );
+    }
+
     public function availableQuantity(CatalogItem|Variant $selection): ?int
     {
         if ($selection instanceof CatalogItem

app/Domains/Catalog/Services/ExpireStockReservationsService.php

@@ -15,7 +15,7 @@ class ExpireStockReservationsService
     ) {}
 
     /**
-     * @return array{purchases: int, cart_items: int}
+     * @return array{purchases: int, cart_reservations: int}
      */
     public function expireOverdue(): array
     {
@@ -29,19 +29,19 @@ class ExpireStockReservationsService
             Log::channel('commands')->info('Stock reservation cleanup completed.', [
                 'command' => 'reservations:expire',
                 'expired_purchases' => $expiredPurchases,
-                'expired_cart_items' => $expiredCartItems,
+                'expired_cart_reservations' => $expiredCartItems,
                 'total_expired' => $expiredPurchases + $expiredCartItems,
             ]);
 
             return [
                 'purchases' => $expiredPurchases,
-                'cart_items' => $expiredCartItems,
+                'cart_reservations' => $expiredCartItems,
             ];
         } catch (Throwable $exception) {
             Log::channel('commands')->error('Stock reservation cleanup failed.', [
                 'command' => 'reservations:expire',
                 'expired_purchases' => $expiredPurchases,
-                'expired_cart_items' => $expiredCartItems,
+                'expired_cart_reservations' => $expiredCartItems,
                 'exception' => $exception,
             ]);
 

app/Domains/Catalog/Services/StockReservationService.php

@@ -2,262 +2,415 @@
 
 namespace App\Domains\Catalog\Services;
 
+use App\Domains\Cart\Models\Cart;
 use App\Domains\Cart\Models\CartItem;
-use App\Domains\Catalog\Models\CatalogItem;
+use App\Domains\Catalog\Models\Inventory;
 use App\Domains\Catalog\Models\StockReservation;
-use App\Domains\Catalog\Models\Variant;
+use App\Domains\Catalog\Models\StockReservationLine;
 use App\Domains\Purchase\Models\Purchase;
 use Illuminate\Support\Carbon;
+use Illuminate\Support\Collection;
 use Illuminate\Support\Facades\DB;
 
 class StockReservationService
 {
+    public const REASON_CART_EMPTY = 'cart_empty';
+
+    public const REASON_CART_CHANGED = 'cart_changed';
+
+    public const REASON_PURCHASE_SUPERSEDED = 'purchase_superseded';
+
+    public const REASON_PURCHASE_CANCELLED = 'purchase_cancelled';
+
+    public const REASON_PAYMENT_REJECTED = 'payment_rejected';
+
+    public const REASON_MANUAL_RELEASE = 'manual_release';
+
     public function __construct(
         private readonly CatalogInventoryService $inventory,
     ) {}
 
-    public function reserve(CartItem $cartItem, CatalogItem|Variant $selection, int $quantity): void
+    public function syncCart(Cart $cart): ?StockReservation
     {
-        DB::transaction(function () use ($cartItem, $selection, $quantity): void {
+        return DB::transaction(function () use ($cart): ?StockReservation {
-            $this->inventory->reserve($selection, $quantity);
+            /** @var Cart $lockedCart */
-            $this->recordIncrease($cartItem, $selection, $quantity);
+            $lockedCart = Cart::query()->lockForUpdate()->findOrFail($cart->getKey());
-        });
+            $items = $lockedCart->items()->orderBy('id')->lockForUpdate()->get();
-    }
+            $this->loadSelections($items);
+            $requirements = $this->requirementsForItems($items);
 
-    public function release(
+            $reservation = $lockedCart->current_stock_reservation_id === null
-        CartItem $cartItem,
+                ? null
-        CatalogItem|Variant $selection,
+                : StockReservation::query()->lockForUpdate()->find($lockedCart->current_stock_reservation_id);
-        int $quantity,
-        string $releasedStatus = StockReservation::STATUS_RELEASED,
-    ): void {
-        DB::transaction(function () use ($cartItem, $selection, $quantity, $releasedStatus): void {
-            $this->ensure($cartItem, $selection);
-            $this->inventory->release($selection, $quantity);
-            $this->recordDecrease($cartItem, $selection, $quantity, $releasedStatus);
-        });
-    }
 
-    public function commit(
+            if ($reservation !== null
-        CartItem $cartItem,
+                && $reservation->status === StockReservation::STATUS_ACTIVE
-        CatalogItem|Variant $selection,
+                && $reservation->expires_at !== null
-        Purchase $purchase,
+                && $reservation->expires_at->isPast()) {
-    ): void {
+                $this->finalizeLocked($reservation, StockReservation::STATUS_EXPIRED, null);
-        DB::transaction(function () use ($cartItem, $selection, $purchase): void {
+                $lockedCart->update(['current_stock_reservation_id' => null]);
-            $this->ensure($cartItem, $selection);
+                $reservation = null;
-            $this->inventory->commit($selection, (int) $cartItem->cantidad);
+            }
 
-            $requirements = $this->inventory->requirementsFor($selection, (int) $cartItem->cantidad);
+            if ($requirements === []) {
-            foreach ($requirements as $inventoryId => $quantity) {
+                if ($reservation !== null && $reservation->status === StockReservation::STATUS_ACTIVE) {
-                $reservation = $this->lockReservation($cartItem, $inventoryId);
+                    $this->finalizeLocked(
-                if (
+                        $reservation,
-                    $reservation === null
+                        StockReservation::STATUS_RELEASED,
-                    || $reservation->status !== StockReservation::STATUS_ACTIVE
+                        self::REASON_CART_EMPTY,
-                    || $reservation->purchase_id !== $purchase->getKey()
+                    );
-                    || $reservation->quantity !== $quantity
-                ) {
-                    throw new \InvalidArgumentException('La reserva de stock no coincide con el item del carrito.');
                 }
 
-                $reservation->update([
+                $lockedCart->update(['current_stock_reservation_id' => null]);
-                    'status' => StockReservation::STATUS_COMMITTED,
+                $cart->current_stock_reservation_id = null;
-                    'committed_at' => now(),
+
-                    'expires_at' => null,
+                return null;
-                ]);
             }
-        });
-    }
 
-    public function ensure(CartItem $cartItem, CatalogItem|Variant $selection): void
+            if ($reservation === null || $reservation->status !== StockReservation::STATUS_ACTIVE) {
-    {
+                $reservation = StockReservation::query()->create([
-        $requirements = $this->inventory->requirementsFor($selection, (int) $cartItem->cantidad);
-
-        foreach ($requirements as $inventoryId => $quantity) {
-            $reservation = $this->lockReservation($cartItem, $inventoryId);
-
-            if ($reservation === null) {
-                StockReservation::query()->create([
-                    'inventory_id' => $inventoryId,
-                    'cart_item_id' => $cartItem->getKey(),
-                    'quantity' => $quantity,
                     'status' => StockReservation::STATUS_ACTIVE,
                     'expires_at' => $this->expiration(),
                 ]);
-
+                $lockedCart->update(['current_stock_reservation_id' => $reservation->getKey()]);
-                continue;
             }
 
-            if ($reservation->status !== StockReservation::STATUS_ACTIVE || $reservation->quantity !== $quantity) {
+            if (Purchase::query()->where('stock_reservation_id', $reservation->getKey())->exists()) {
-                $reservation->update([
+                throw new \InvalidArgumentException('La reserva vinculada a una compra no se puede modificar.');
-                    'quantity' => $quantity,
-                    'status' => StockReservation::STATUS_ACTIVE,
-                    'committed_at' => null,
-                    'released_at' => null,
-                    'expires_at' => $this->expiration(),
-                ]);
             }
-        }
-    }
 
-    public function attachToPurchase(
+            $currentLines = StockReservationLine::query()
-        CartItem $cartItem,
+                ->where('stock_reservation_id', $reservation->getKey())
-        CatalogItem|Variant $selection,
+                ->orderBy('inventory_id')
-        Purchase $purchase,
-    ): void {
-        DB::transaction(function () use ($cartItem, $selection, $purchase): void {
-            $this->ensure($cartItem, $selection);
-            StockReservation::query()
-                ->where('cart_item_id', $cartItem->getKey())
-                ->where('status', StockReservation::STATUS_ACTIVE)
-                ->update([
-                    'purchase_id' => $purchase->getKey(),
-                    'expires_at' => $purchase->expires_at,
-                ]);
-        });
-    }
-
-    public function detachFromPurchase(Purchase $purchase): void
-    {
-        StockReservation::query()
-            ->where('purchase_id', $purchase->getKey())
-            ->where('status', StockReservation::STATUS_ACTIVE)
-            ->update([
-                'purchase_id' => null,
-                'expires_at' => $this->expiration(),
-            ]);
-    }
-
-    public function restore(CartItem $cartItem, CatalogItem|Variant $selection): void
-    {
-        DB::transaction(function () use ($cartItem, $selection): void {
-            $requirements = $this->inventory->requirementsFor(
-                $selection,
-                (int) $cartItem->cantidad,
-            );
-            $activeReservations = StockReservation::query()
-                ->where('cart_item_id', $cartItem->getKey())
-                ->where('status', StockReservation::STATUS_ACTIVE)
                 ->lockForUpdate()
                 ->get()
                 ->keyBy('inventory_id');
+            $inventoryIds = collect(array_keys($requirements))
+                ->merge($currentLines->keys())
+                ->map(fn ($id): int => (int) $id)
+                ->unique()
+                ->sort()
+                ->values();
+            $inventories = Inventory::query()
+                ->whereKey($inventoryIds)
+                ->orderBy('id')
+                ->lockForUpdate()
+                ->get()
+                ->keyBy('id');
 
-            $hasCompleteReservation = collect($requirements)->every(
+            foreach ($inventoryIds as $inventoryId) {
-                fn (int $quantity, int $inventoryId): bool => (int) ($activeReservations->get($inventoryId)?->quantity ?? 0) === $quantity,
+                $inventory = $inventories->get($inventoryId)
-            );
+                    ?? throw new \InvalidArgumentException('No se encontró el inventario requerido.');
+                $previous = (int) ($currentLines->get($inventoryId)?->quantity ?? 0);
+                $required = (int) ($requirements[$inventoryId]['quantity'] ?? 0);
+                $delta = $required - $previous;
 
-            if ($hasCompleteReservation) {
+                if ($delta > 0
+                    && $requirements[$inventoryId]['tracks_inventory']
+                    && $inventory->availableStock() < $delta) {
+                    throw new \InvalidArgumentException('No hay suficiente stock disponible para reservar el carrito.');
+                }
+
+                if ($delta < 0 && $inventory->reserved_stock < abs($delta)) {
+                    throw new \InvalidArgumentException('La reserva de stock del carrito es inconsistente.');
+                }
+            }
+
+            foreach ($inventoryIds as $inventoryId) {
+                /** @var Inventory $inventory */
+                $inventory = $inventories->get($inventoryId);
+                $line = $currentLines->get($inventoryId);
+                $previous = (int) ($line?->quantity ?? 0);
+                $required = (int) ($requirements[$inventoryId]['quantity'] ?? 0);
+                $delta = $required - $previous;
+
+                if ($delta > 0) {
+                    $inventory->reserve($delta, $requirements[$inventoryId]['tracks_inventory']);
+                } elseif ($delta < 0) {
+                    $inventory->release(abs($delta));
+                }
+
+                if ($required === 0) {
+                    $line?->delete();
+
+                    continue;
+                }
+
+                StockReservationLine::query()->updateOrCreate(
+                    [
+                        'stock_reservation_id' => $reservation->getKey(),
+                        'inventory_id' => $inventoryId,
+                    ],
+                    [
+                        'quantity' => $required,
+                        'tracks_inventory' => $requirements[$inventoryId]['tracks_inventory'],
+                    ],
+                );
+            }
+
+            $reservation->update([
+                'expires_at' => $this->expiration(),
+                'release_reason' => null,
+            ]);
+            $cart->current_stock_reservation_id = $reservation->getKey();
+
+            return $reservation->fresh('lines');
+        });
+    }
+
+    public function attachToPurchase(Cart $cart, Purchase $purchase): StockReservation
+    {
+        return DB::transaction(function () use ($cart, $purchase): StockReservation {
+            /** @var Cart $lockedCart */
+            $lockedCart = Cart::query()->lockForUpdate()->findOrFail($cart->getKey());
+            /** @var Purchase $lockedPurchase */
+            $lockedPurchase = Purchase::query()->lockForUpdate()->findOrFail($purchase->getKey());
+
+            if ($lockedCart->current_stock_reservation_id === null) {
+                throw new \InvalidArgumentException('El carrito no tiene una reserva de stock activa.');
+            }
+
+            /** @var StockReservation $reservation */
+            $reservation = StockReservation::query()->lockForUpdate()->findOrFail($lockedCart->current_stock_reservation_id);
+            if ($reservation->status !== StockReservation::STATUS_ACTIVE) {
+                throw new \InvalidArgumentException('La reserva de stock no está activa.');
+            }
+
+            $linkedPurchase = Purchase::query()
+                ->where('stock_reservation_id', $reservation->getKey())
+                ->whereKeyNot($lockedPurchase->getKey())
+                ->exists();
+            if ($linkedPurchase) {
+                throw new \InvalidArgumentException('La reserva de stock ya pertenece a otra compra.');
+            }
+
+            $lockedPurchase->update(['stock_reservation_id' => $reservation->getKey()]);
+            $reservation->update(['expires_at' => $lockedPurchase->expires_at]);
+            $purchase->stock_reservation_id = $reservation->getKey();
+            $cart->current_stock_reservation_id = $reservation->getKey();
+
+            return $reservation->fresh('lines');
+        });
+    }
+
+    public function commit(Purchase $purchase): void
+    {
+        DB::transaction(function () use ($purchase): void {
+            /** @var Purchase $purchase */
+            $purchase = Purchase::query()->lockForUpdate()->findOrFail($purchase->getKey());
+            if ($purchase->stock_reservation_id === null) {
+                throw new \InvalidArgumentException('La compra no tiene una reserva de stock.');
+            }
+
+            /** @var StockReservation $reservation */
+            $reservation = StockReservation::query()->lockForUpdate()->findOrFail($purchase->stock_reservation_id);
+            if ($reservation->status === StockReservation::STATUS_COMMITTED) {
+                return;
+            }
+            if ($reservation->status !== StockReservation::STATUS_ACTIVE) {
+                throw new \InvalidArgumentException('La reserva de stock no está activa.');
+            }
+
+            $lines = $this->lockLines($reservation);
+            if ($lines->isEmpty()) {
+                throw new \InvalidArgumentException('La reserva de stock no tiene inventarios.');
+            }
+
+            $inventories = $this->lockInventories($lines);
+            foreach ($lines as $line) {
+                $inventory = $inventories->get($line->inventory_id)
+                    ?? throw new \InvalidArgumentException('No se encontró el inventario reservado.');
+                if ($inventory->reserved_stock < $line->quantity
+                    || ($line->tracks_inventory && $inventory->real_stock < $line->quantity)) {
+                    throw new \InvalidArgumentException('La reserva de stock no alcanza para confirmar la compra.');
+                }
+            }
+
+            foreach ($lines as $line) {
+                $inventories->get($line->inventory_id)->buy(
+                    (int) $line->quantity,
+                    (bool) $line->tracks_inventory,
+                );
+            }
+
+            $reservation->update([
+                'status' => StockReservation::STATUS_COMMITTED,
+                'expires_at' => null,
+                'committed_at' => now(),
+                'released_at' => null,
+                'expired_at' => null,
+                'release_reason' => null,
+            ]);
+        });
+    }
+
+    public function releaseForPurchase(
+        Purchase $purchase,
+        string $status = StockReservation::STATUS_RELEASED,
+        ?string $reason = null,
+    ): void {
+        DB::transaction(function () use ($purchase, $status, $reason): void {
+            /** @var Purchase $purchase */
+            $purchase = Purchase::query()->lockForUpdate()->findOrFail($purchase->getKey());
+            if ($purchase->stock_reservation_id === null) {
                 return;
             }
 
-            if ($activeReservations->isNotEmpty()) {
+            /** @var StockReservation|null $reservation */
-                throw new \InvalidArgumentException('La reserva de stock del carrito es inconsistente.');
+            $reservation = StockReservation::query()->lockForUpdate()->find($purchase->stock_reservation_id);
+            if ($reservation !== null) {
+                $this->finalizeLocked($reservation, $status, $reason);
+            }
+        });
+    }
+
+    public function releaseCurrentCartReservation(
+        Cart $cart,
+        string $reason = self::REASON_CART_CHANGED,
+    ): void {
+        DB::transaction(function () use ($cart, $reason): void {
+            /** @var Cart $cart */
+            $cart = Cart::query()->lockForUpdate()->findOrFail($cart->getKey());
+            if ($cart->current_stock_reservation_id === null) {
+                return;
             }
 
-            $this->inventory->reserve($selection, (int) $cartItem->cantidad);
+            /** @var StockReservation|null $reservation */
-            $this->recordIncrease($cartItem, $selection, (int) $cartItem->cantidad);
+            $reservation = StockReservation::query()->lockForUpdate()->find($cart->current_stock_reservation_id);
+            if ($reservation !== null) {
+                $this->finalizeLocked($reservation, StockReservation::STATUS_RELEASED, $reason);
+            }
+            $cart->update(['current_stock_reservation_id' => null]);
+        });
+    }
+
+    public function expire(StockReservation $reservation): void
+    {
+        DB::transaction(function () use ($reservation): void {
+            /** @var StockReservation $reservation */
+            $reservation = StockReservation::query()->lockForUpdate()->findOrFail($reservation->getKey());
+            if ($reservation->status !== StockReservation::STATUS_ACTIVE
+                || $reservation->expires_at === null
+                || $reservation->expires_at->isFuture()) {
+                return;
+            }
+
+            $this->finalizeLocked($reservation, StockReservation::STATUS_EXPIRED, null);
         });
     }
 
     public function syncPurchaseExpiration(Purchase $purchase): void
     {
+        if ($purchase->stock_reservation_id === null) {
+            return;
+        }
+
         StockReservation::query()
-            ->where('purchase_id', $purchase->getKey())
+            ->whereKey($purchase->stock_reservation_id)
             ->where('status', StockReservation::STATUS_ACTIVE)
             ->update(['expires_at' => $purchase->expires_at]);
     }
 
-    public function transfer(CartItem $source, CartItem $target): void
+    /**
+     * @param  Collection<int, CartItem>  $items
+     * @return array<int, array{quantity: int, tracks_inventory: bool}>
+     */
+    private function requirementsForItems(Collection $items): array
     {
-        DB::transaction(function () use ($source, $target): void {
+        $requirements = [];
-            $sourceReservations = StockReservation::query()
+        foreach ($items as $item) {
-                ->where('cart_item_id', $source->getKey())
+            $selection = $item->selectedItem();
-                ->where('status', StockReservation::STATUS_ACTIVE)
+            if ($selection === null) {
-                ->orderBy('inventory_id')
+                throw new \InvalidArgumentException('El carrito contiene un item de catálogo inexistente.');
-                ->lockForUpdate()
+            }
-                ->get();
 
-            foreach ($sourceReservations as $sourceReservation) {
+            foreach ($this->inventory->detailedRequirementsFor($selection, (int) $item->cantidad) as $inventoryId => $requirement) {
-                $targetReservation = $this->lockReservation($target, (int) $sourceReservation->inventory_id);
+                if (isset($requirements[$inventoryId])) {
-
+                    $requirements[$inventoryId]['quantity'] += $requirement['quantity'];
-                if ($targetReservation === null) {
+                    $requirements[$inventoryId]['tracks_inventory'] =
-                    $sourceItemQuantity = (int) $source->cantidad;
+                        $requirements[$inventoryId]['tracks_inventory'] || $requirement['tracks_inventory'];
-                    $targetItemQuantity = (int) $target->fresh()->cantidad;
-                    $perItemQuantity = intdiv((int) $sourceReservation->quantity, $sourceItemQuantity);
-                    $sourceReservation->update([
-                        'cart_item_id' => $target->getKey(),
-                        'purchase_id' => null,
-                        'quantity' => $perItemQuantity * $targetItemQuantity,
-                        'expires_at' => $this->expiration(),
-                    ]);
 
                     continue;
                 }
 
-                $targetReservation->update([
+                $requirements[$inventoryId] = $requirement;
-                    'quantity' => $targetReservation->quantity + $sourceReservation->quantity,
-                    'status' => StockReservation::STATUS_ACTIVE,
-                    'expires_at' => $this->expiration(),
-                ]);
-                $sourceReservation->delete();
             }
-        });
-    }
-
-    private function recordIncrease(CartItem $cartItem, CatalogItem|Variant $selection, int $quantity): void
-    {
-        foreach ($this->inventory->requirementsFor($selection, $quantity) as $inventoryId => $requiredQuantity) {
-            $reservation = $this->lockReservation($cartItem, $inventoryId);
-
-            if ($reservation === null) {
-                StockReservation::query()->create([
-                    'inventory_id' => $inventoryId,
-                    'cart_item_id' => $cartItem->getKey(),
-                    'quantity' => $requiredQuantity,
-                    'status' => StockReservation::STATUS_ACTIVE,
-                    'expires_at' => $this->expiration(),
-                ]);
-
-                continue;
-            }
-
-            $reservation->update([
-                'quantity' => ($reservation->status === StockReservation::STATUS_ACTIVE ? $reservation->quantity : 0) + $requiredQuantity,
-                'status' => StockReservation::STATUS_ACTIVE,
-                'committed_at' => null,
-                'released_at' => null,
-                'expires_at' => $this->expiration(),
-            ]);
         }
+
+        ksort($requirements);
+
+        return $requirements;
     }
 
-    private function recordDecrease(
+    /** @param Collection<int, CartItem> $items */
-        CartItem $cartItem,
+    private function loadSelections(Collection $items): void
-        CatalogItem|Variant $selection,
-        int $quantity,
-        string $releasedStatus,
-    ): void {
-        foreach ($this->inventory->requirementsFor($selection, $quantity) as $inventoryId => $requiredQuantity) {
-            $reservation = $this->lockReservation($cartItem, $inventoryId);
-            if ($reservation === null || $reservation->status !== StockReservation::STATUS_ACTIVE || $reservation->quantity < $requiredQuantity) {
-                throw new \InvalidArgumentException('La reserva de stock no alcanza para liberar la cantidad solicitada.');
-            }
-
-            $remaining = $reservation->quantity - $requiredQuantity;
-            $reservation->update([
-                'quantity' => $remaining,
-                'status' => $remaining === 0 ? $releasedStatus : StockReservation::STATUS_ACTIVE,
-                'released_at' => $remaining === 0 ? now() : null,
-                'expires_at' => $remaining === 0 ? null : $reservation->expires_at,
-            ]);
-        }
-    }
-
-    private function lockReservation(CartItem $cartItem, int $inventoryId): ?StockReservation
     {
-        return StockReservation::query()
+        $items->load([
-            ->where('cart_item_id', $cartItem->getKey())
+            'catalogItem.inventory',
-            ->where('inventory_id', $inventoryId)
+            'catalogItem.bundleComponents.catalogItem.inventory',
+            'catalogItem.bundleComponents.variant.inventory',
+            'catalogItem.bundleComponents.variant.catalogItem',
+            'variant.inventory',
+            'variant.catalogItem',
+        ]);
+    }
+
+    /** @return Collection<int, StockReservationLine> */
+    private function lockLines(StockReservation $reservation): Collection
+    {
+        return StockReservationLine::query()
+            ->where('stock_reservation_id', $reservation->getKey())
+            ->orderBy('inventory_id')
             ->lockForUpdate()
-            ->first();
+            ->get();
+    }
+
+    /**
+     * @param  Collection<int, StockReservationLine>  $lines
+     * @return Collection<int, Inventory>
+     */
+    private function lockInventories(Collection $lines): Collection
+    {
+        return Inventory::query()
+            ->whereKey($lines->pluck('inventory_id'))
+            ->orderBy('id')
+            ->lockForUpdate()
+            ->get()
+            ->keyBy('id');
+    }
+
+    private function finalizeLocked(
+        StockReservation $reservation,
+        string $status,
+        ?string $reason,
+    ): void {
+        if ($reservation->status !== StockReservation::STATUS_ACTIVE) {
+            return;
+        }
+        if (! in_array($status, [StockReservation::STATUS_RELEASED, StockReservation::STATUS_EXPIRED], true)) {
+            throw new \InvalidArgumentException('El estado final de la reserva no es válido.');
+        }
+
+        $lines = $this->lockLines($reservation);
+        $inventories = $this->lockInventories($lines);
+        foreach ($lines as $line) {
+            $inventory = $inventories->get($line->inventory_id)
+                ?? throw new \InvalidArgumentException('No se encontró el inventario reservado.');
+            $inventory->release((int) $line->quantity);
+        }
+
+        $now = now();
+        $reservation->update([
+            'status' => $status,
+            'expires_at' => null,
+            'released_at' => $status === StockReservation::STATUS_RELEASED ? $now : null,
+            'expired_at' => $status === StockReservation::STATUS_EXPIRED ? $now : null,
+            'release_reason' => $status === StockReservation::STATUS_RELEASED ? $reason : null,
+        ]);
+
+        Cart::query()
+            ->where('current_stock_reservation_id', $reservation->getKey())
+            ->update(['current_stock_reservation_id' => null]);
     }
 
     private function expiration(): Carbon

app/Domains/Catalog/documentacion/README.md

@@ -9,7 +9,7 @@ Modela y publica la oferta comercial del tenant: productos, variantes, categorí
 - `CatalogItem` es la raíz del producto y se relaciona con tenant, categoría, marca, inventario, variantes, atributos, adjuntos y grupos destacados.
 - `Variant`, `ItemAttribute`, `Attribute`, `AttributeOption` y `VariantDefinition` describen opciones comercializables.
 - `Inventory` administra stock disponible, reservado y comprado.
-- `StockReservation` atribuye cada unidad reservada a un ítem de carrito y, durante checkout, a una compra, con estados `active`, `committed`, `released` y `expired`.
+- `StockReservation` representa la reserva completa de un carrito o checkout, con estados `active`, `committed`, `released` y `expired`. Sus `StockReservationLine` agregan la cantidad requerida por inventario, incluso cuando varios ítems o bundles consumen el mismo stock.
 - `Category` soporta jerarquía y categorías globales o propias del tenant.
 - `FeaturedGroup` y `FeaturedItem` organizan secciones destacadas.
 - `BundleComponent` representa los componentes de un paquete.
@@ -18,7 +18,7 @@ Modela y publica la oferta comercial del tenant: productos, variantes, categorí
 
 - `CatalogService`: alta, búsqueda, detalle, listado por categoría y eliminación.
 - `CatalogInventoryService`: consulta, reserva, libera y confirma inventario.
-- `StockReservationService`: mantiene el ledger de reservas sincronizado con `Inventory.reserved_stock`.
+- `StockReservationService`: sincroniza el carrito como conjunto, bloquea todos sus inventarios en orden estable y mantiene el ledger agregado consistente con `Inventory.reserved_stock`.
 - `FeaturedGroupService`: pagina los ítems destacados para la tienda.
 - `OnTicketFeaturedGroupService`: administra grupos destacados del panel para sitios de tickets.
 

app/Domains/Desfile/Services/InvitationPurchaseProvisioner.php

@@ -392,15 +392,28 @@ class InvitationPurchaseProvisioner
             'sold_units' => $inventory->sold_units + 1,
         ]);
 
-        DB::table('stock_reservations')->insert([
+        $reservationId = DB::table('compras')->where('id', $purchaseId)->value('stock_reservation_id');
+        if ($reservationId === null) {
+            $reservationId = DB::table('stock_reservations')->insertGetId([
+                'status' => 'committed',
+                'expires_at' => null,
+                'committed_at' => $now,
+                'released_at' => null,
+                'expired_at' => null,
+                'release_reason' => null,
+                'created_at' => $now,
+                'updated_at' => $now,
+            ]);
+            DB::table('compras')->where('id', $purchaseId)->update([
+                'stock_reservation_id' => $reservationId,
+            ]);
+        }
+
+        DB::table('stock_reservation_lines')->insert([
+            'stock_reservation_id' => $reservationId,
             'inventory_id' => $inventory->id,
-            'cart_item_id' => null,
-            'purchase_id' => $purchaseId,
             'quantity' => 1,
-            'status' => 'committed',
+            'tracks_inventory' => true,
-            'expires_at' => null,
-            'committed_at' => $now,
-            'released_at' => null,
             'created_at' => $now,
             'updated_at' => $now,
         ]);

app/Domains/Purchase/Models/Purchase.php

@@ -19,6 +19,7 @@ use Illuminate\Support\Facades\DB;
 
 #[Fillable([
     'cart_id',
+    'stock_reservation_id',
     'tenant_codigo',
     'user_id',
     'status',
@@ -77,6 +78,7 @@ class Purchase extends Model
     {
         return [
             'cart_id' => 'integer',
+            'stock_reservation_id' => 'integer',
             'user_id' => 'integer',
             'expires_at' => 'datetime',
             'total' => 'decimal:2',
@@ -123,10 +125,10 @@ class Purchase extends Model
         return $this->hasMany(Ticket::class, 'source_purchase_id');
     }
 
-    /** @return HasMany<StockReservation, $this> */
+    /** @return BelongsTo<StockReservation, $this> */
-    public function stockReservations(): HasMany
+    public function stockReservation(): BelongsTo
     {
-        return $this->hasMany(StockReservation::class);
+        return $this->belongsTo(StockReservation::class);
     }
 
     /**

app/Domains/Purchase/Services/Checkout/CompleteCheckoutService.php

@@ -161,13 +161,14 @@ class CompleteCheckoutService
                     ]);
                 }
 
-                try {
+            }
-                    $this->reservations->commit($cartItem, $selection, $purchase);
+
-                } catch (\InvalidArgumentException) {
+            try {
-                    throw ValidationException::withMessages([
+                $this->reservations->commit($purchase);
-                        'items' => __('api.purchase.inconsistent_reservation'),
+            } catch (\InvalidArgumentException) {
-                    ]);
+                throw ValidationException::withMessages([
-                }
+                    'items' => __('api.purchase.inconsistent_reservation'),
+                ]);
             }
 
             $this->sourceCart->finalize($purchase);

app/Domains/Purchase/Services/Checkout/ReleaseCheckoutService.php

@@ -118,16 +118,40 @@ class ReleaseCheckoutService
     private function releasePurchaseReservations(Purchase $purchase, string $targetStatus): void
     {
         $cart = $purchase->cart()->withTrashed()->lockForUpdate()->first();
+        try {
+            $this->reservations->releaseForPurchase(
+                $purchase,
+                $targetStatus === Purchase::STATUS_EXPIRED
+                    ? StockReservation::STATUS_EXPIRED
+                    : StockReservation::STATUS_RELEASED,
+                $targetStatus === Purchase::STATUS_CANCELLED
+                    ? StockReservationService::REASON_PURCHASE_CANCELLED
+                    : ($targetStatus === Purchase::STATUS_REJECTED
+                        ? StockReservationService::REASON_PAYMENT_REJECTED
+                        : null),
+            );
+        } catch (\InvalidArgumentException) {
+            throw ValidationException::withMessages([
+                'items' => __('api.purchase.inconsistent_reservation'),
+            ]);
+        }
+
         if ($cart === null) {
             return;
         }
 
         if ($cart->status === 'active') {
-            $this->reservations->detachFromPurchase($purchase);
             Cart::query()
                 ->whereKey($cart->getKey())
                 ->where('current_purchase_id', $purchase->getKey())
-                ->update(['current_purchase_id' => null]);
+                ->update([
+                    'current_purchase_id' => null,
+                    'current_stock_reservation_id' => null,
+                ]);
+
+            if ($targetStatus === Purchase::STATUS_CANCELLED) {
+                $this->reservations->syncCart($cart);
+            }
 
             return;
         }
@@ -136,37 +160,6 @@ class ReleaseCheckoutService
             return;
         }
 
-        $cartItems = $cart->items()->orderBy('id')->lockForUpdate()->get();
-        $cartItems->load([
-            'catalogItem.inventory',
-            'catalogItem.bundleComponents.catalogItem.inventory',
-            'catalogItem.bundleComponents.variant.inventory',
-            'variant.inventory',
-            'variant.catalogItem',
-        ]);
-
-        foreach ($cartItems as $cartItem) {
-            $selection = $cartItem->selectedItem();
-            if ($selection === null) {
-                continue;
-            }
-
-            try {
-                $this->reservations->release(
-                    $cartItem,
-                    $selection,
-                    (int) $cartItem->cantidad,
-                    $targetStatus === Purchase::STATUS_EXPIRED
-                        ? StockReservation::STATUS_EXPIRED
-                        : StockReservation::STATUS_RELEASED,
-                );
-            } catch (\InvalidArgumentException) {
-                throw ValidationException::withMessages([
-                    'items' => __('api.purchase.inconsistent_reservation'),
-                ]);
-            }
-        }
-
         if (! $cart->trashed()) {
             $cart->update(['status' => 'converted']);
             $cart->delete();

app/Domains/Purchase/Services/Checkout/StartCheckoutService.php

@@ -169,21 +169,31 @@ class StartCheckoutService
                 'cantidad' => $line['quantity'],
             ]);
 
-            try {
-                $this->reservations->reserve($cartItem, $line['selection'], $line['quantity']);
-            } catch (\InvalidArgumentException) {
-                $availableQuantity = $this->inventory->availableQuantity($line['selection']) ?? 0;
-
-                throw new InsufficientStockException([
-                    $this->unavailableItem($line, $availableQuantity),
-                ]);
-            }
-
             $cartItem->setRelation('catalogItem', $line['catalog_item']);
             $cartItem->setRelation('variant', $line['selection'] instanceof Variant ? $line['selection'] : null);
             $cartItems->push($cartItem);
         }
 
+        try {
+            $this->reservations->syncCart($cart);
+        } catch (\InvalidArgumentException) {
+            $unavailable = $resolvedLines
+                ->map(function (array $line): ?array {
+                    $availableQuantity = $this->inventory->availableQuantity($line['selection']);
+
+                    return $availableQuantity !== null && $availableQuantity < $line['quantity']
+                        ? $this->unavailableItem($line, $availableQuantity)
+                        : null;
+                })
+                ->filter()
+                ->values()
+                ->all();
+
+            throw new InsufficientStockException($unavailable !== [] ? $unavailable : [
+                $this->unavailableItem($resolvedLines->first(), 0),
+            ]);
+        }
+
         $purchase = $this->createPurchase(
             $tenant,
             $userId,
@@ -194,19 +204,12 @@ class StartCheckoutService
             $cart->getKey(),
         );
         $cart->update(['current_purchase_id' => $purchase->getKey()]);
+        $this->reservations->attachToPurchase($cart, $purchase);
 
         $cartItems = $cart->items()->orderBy('id')->lockForUpdate()->get();
         $this->loadCartItems($cartItems);
         $purchase->items()->createMany($this->snapshots->fromCartItems($cartItems));
 
-        foreach ($cartItems as $index => $cartItem) {
-            $this->reservations->attachToPurchase(
-                $cartItem,
-                $resolvedLines->get($index)['selection'],
-                $purchase,
-            );
-        }
-
         return $this->loadPurchase($purchase);
     }
 
@@ -257,6 +260,7 @@ class StartCheckoutService
         $this->verifyTenantItems($tenant, $cartItems);
         $this->assertCartPurchaseLimits($tenant, $userId, $cartItems, $cart->getKey());
         $cart->setRelation('items', $cartItems);
+        $this->reservations->syncCart($cart);
 
         $purchase = $this->createPurchase(
             $tenant,
@@ -266,16 +270,9 @@ class StartCheckoutService
             $cart->getKey(),
         );
         $cart->update(['current_purchase_id' => $purchase->getKey()]);
+        $this->reservations->attachToPurchase($cart, $purchase);
         $purchase->items()->createMany($this->snapshots->fromCartItems($cartItems));
 
-        foreach ($cartItems as $cartItem) {
-            $this->reservations->attachToPurchase(
-                $cartItem,
-                $cartItem->selectedItem(),
-                $purchase,
-            );
-        }
-
         return $this->loadPurchase($purchase);
     }
 
@@ -320,6 +317,14 @@ class StartCheckoutService
                 'status' => Purchase::STATUS_SUPERSEDED,
                 'expires_at' => null,
             ]);
+            $this->reservations->releaseForPurchase(
+                $currentPurchase,
+                reason: StockReservationService::REASON_PURCHASE_SUPERSEDED,
+            );
+            $cart->update([
+                'current_purchase_id' => null,
+                'current_stock_reservation_id' => null,
+            ]);
         }
 
         return $cart;

app/Domains/Purchase/Services/TenantTransactionResetService.php

@@ -135,11 +135,25 @@ class TenantTransactionResetService
      */
     private function reservationQuery(array $scope): Builder
     {
+        $reservationIds = DB::table('carritos')
+            ->whereIn('id', $scope['cart_ids'])
+            ->whereNotNull('current_stock_reservation_id')
+            ->pluck('current_stock_reservation_id')
+            ->merge(
+                DB::table('compras')
+                    ->whereIn('id', $scope['purchase_ids'])
+                    ->whereNotNull('stock_reservation_id')
+                    ->pluck('stock_reservation_id'),
+            )
+            ->merge(
+                DB::table('stock_reservation_lines')
+                    ->whereIn('inventory_id', $scope['inventory_ids'])
+                    ->pluck('stock_reservation_id'),
+            )
+            ->unique()
+            ->values();
+
         return DB::table('stock_reservations')
-            ->where(function (Builder $query) use ($scope): void {
+            ->whereIn('id', $reservationIds);
-                $query->whereIn('inventory_id', $scope['inventory_ids'])
-                    ->orWhereIn('purchase_id', $scope['purchase_ids'])
-                    ->orWhereIn('cart_item_id', $scope['cart_item_ids']);
-            });
     }
 }

app/Domains/Purchase/Services/UserPurchaseLimitService.php

@@ -88,9 +88,9 @@ class UserPurchaseLimitService
                         $excludedCartId !== null,
                         fn ($query) => $query->whereKeyNot($excludedCartId),
                     ))
-                ->whereHas('stockReservations', fn ($query) => $query
+                ->whereHas('cart.currentStockReservation', fn ($query) => $query
                     ->where('status', 'active')
-                    ->whereNull('purchase_id'))
+                    ->whereDoesntHave('purchase'))
                 ->sum('cantidad');
 
             if ($purchasedQuantity + $checkoutQuantity + $reservedCartQuantity + $requestedQuantity > $limit) {
@@ -161,9 +161,9 @@ class UserPurchaseLimitService
             ->whereHas('cart', fn ($query) => $query
                 ->where('user_id', $userId)
                 ->where('status', 'active'))
-            ->whereHas('stockReservations', fn ($query) => $query
+            ->whereHas('cart.currentStockReservation', fn ($query) => $query
                 ->where('status', 'active')
-                ->whereNull('purchase_id'))
+                ->whereDoesntHave('purchase'))
             ->groupBy('catalog_item_id')
             ->pluck('quantity', 'catalog_item_id');
 

app/Domains/Purchase/documentacion/README.md

@@ -6,7 +6,7 @@ Implementa el ciclo de compra y checkout: crea la cabecera de compra desde un ca
 
 ## Modelo
 
-- `Purchase`: raíz de la compra; estados `created`, `pending_payment`, `in_review`, `paid`, `cancelled`, `rejected` y `expired`.
+- `Purchase`: raíz de la compra; estados `created`, `pending_payment`, `in_review`, `paid`, `cancelled`, `rejected` y `expired`, y referencia la reserva que respaldó ese intento de checkout.
 - `PurchaseItem`: snapshot definitivo del producto o variante, creado recién al confirmar la compra.
 - `TelepagosQr` y `TelepagosPayment`: datos del QR e intentos/resultados del proveedor.
 - `PurchasePaid`: evento emitido una sola vez al pasar a pagada bajo bloqueo transaccional.
@@ -15,7 +15,7 @@ Implementa el ciclo de compra y checkout: crea la cabecera de compra desde un ca
 
 `CheckoutService` es la fachada estable. Delega en:
 
-- `StartCheckoutService`: inicia la compra desde el carrito o crea un carrito técnico para compra directa, sin crear todavía `PurchaseItem`.
+- `StartCheckoutService`: inicia la compra desde el carrito o crea un carrito técnico para compra directa, refresca el vencimiento de la reserva agregada y crea los snapshots `PurchaseItem`.
 - `EditCheckoutService`: modifica los datos del comprador antes del cierre.
 - `CompleteCheckoutService`: completa, envía a revisión o materializa los `PurchaseItem` al confirmar el pago.
 - `ReleaseCheckoutService`: cancela, vence y procesa vencimientos pendientes.
@@ -24,7 +24,7 @@ Implementa el ciclo de compra y checkout: crea la cabecera de compra desde un ca
 
 Al informar una transferencia, la compra pasa de `pending_payment` a `in_review` y deja de vencer. Si el comprador abandona el checkout durante la revisión, la compra y sus reservas permanecen intactas y se crea un carrito activo nuevo para que pueda seguir comprando. Adminapp puede confirmar o anular explícitamente la compra en revisión.
 
-Las cantidades y variantes se editan mediante el dominio Cart. El endpoint autenticado `PATCH /checkout-carts/{cart}/items/{cartItem}` valida que el carrito pertenezca al usuario y a una compra editable. Cuando existe un cambio real, invalida atómicamente el intento de pago anterior, recalcula el total y renueva la reserva; Purchase no expone operaciones sobre líneas antes de la confirmación.
+Las cantidades y variantes se editan mediante el dominio Cart. El endpoint autenticado `PATCH /checkout-carts/{cart}/items/{cartItem}` valida que el carrito pertenezca al usuario y a una compra editable. Cuando existe un cambio real, invalida atómicamente el intento de pago anterior, libera su reserva completa y crea otra para el contenido actualizado; Purchase no expone operaciones sobre líneas antes de la confirmación.
 
 `UserPurchaseLimitService` controla límites de compra y `CheckoutService` conserva el punto de entrada para controladores e integraciones.
 

database/migrations/2026_08_25_020000_centralize_stock_reservations.php

@@ -0,0 +1,180 @@
+<?php
+
+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
+    {
+        Schema::rename('stock_reservations', 'stock_reservation_lines');
+
+        Schema::create('stock_reservations', function (Blueprint $table): void {
+            $table->id();
+            $table->string('status')->default('active');
+            $table->dateTime('expires_at')->nullable();
+            $table->dateTime('committed_at')->nullable();
+            $table->dateTime('released_at')->nullable();
+            $table->dateTime('expired_at')->nullable();
+            $table->string('release_reason')->nullable();
+            $table->timestamps();
+
+            $table->index(['status', 'expires_at']);
+        });
+
+        Schema::table('stock_reservation_lines', function (Blueprint $table): void {
+            $table->foreignId('stock_reservation_id')->nullable()->after('id');
+            $table->boolean('tracks_inventory')->default(true)->after('quantity');
+        });
+
+        Schema::table('carritos', function (Blueprint $table): void {
+            $table->foreignId('current_stock_reservation_id')->nullable()->after('current_purchase_id');
+        });
+
+        Schema::table('compras', function (Blueprint $table): void {
+            $table->foreignId('stock_reservation_id')->nullable()->after('cart_id');
+        });
+
+        $cartIdsByItem = DB::table('carrito_items')->pluck('cart_id', 'id');
+        $unlimitedInventoryIds = DB::table('catalog_items')
+            ->where('inventory_policy', 'unlimited')
+            ->whereNotNull('inventory_id')
+            ->pluck('inventory_id')
+            ->merge(
+                DB::table('variantes')
+                    ->join('catalog_items', 'catalog_items.id', '=', 'variantes.catalog_item_id')
+                    ->where('catalog_items.inventory_policy', 'unlimited')
+                    ->pluck('variantes.inventory_id'),
+            )
+            ->map(fn ($id): int => (int) $id)
+            ->unique();
+        $legacyRows = DB::table('stock_reservation_lines')->orderBy('id')->get();
+        $groups = $legacyRows->groupBy(function (object $row) use ($cartIdsByItem): string {
+            if ($row->purchase_id !== null) {
+                return 'purchase:'.$row->purchase_id;
+            }
+
+            $cartId = $row->cart_item_id === null ? null : $cartIdsByItem->get($row->cart_item_id);
+
+            return $cartId === null ? 'legacy:'.$row->id : 'cart:'.$cartId;
+        });
+
+        foreach ($groups as $key => $rows) {
+            $statuses = $rows->pluck('status');
+            $status = $statuses->contains('active')
+                ? 'active'
+                : ($statuses->contains('committed')
+                    ? 'committed'
+                    : ($statuses->contains('expired') ? 'expired' : 'released'));
+            $first = $rows->first();
+            $reservationId = DB::table('stock_reservations')->insertGetId([
+                'status' => $status,
+                'expires_at' => $status === 'active' ? $rows->pluck('expires_at')->filter()->max() : null,
+                'committed_at' => $status === 'committed' ? $rows->pluck('committed_at')->filter()->max() : null,
+                'released_at' => $status === 'released' ? $rows->pluck('released_at')->filter()->max() : null,
+                'expired_at' => $status === 'expired' ? $rows->pluck('released_at')->filter()->max() : null,
+                'release_reason' => null,
+                'created_at' => $first->created_at,
+                'updated_at' => $rows->pluck('updated_at')->filter()->max() ?? $first->updated_at,
+            ]);
+
+            foreach ($rows->groupBy('inventory_id') as $inventoryRows) {
+                $line = $inventoryRows->first();
+                DB::table('stock_reservation_lines')->where('id', $line->id)->update([
+                    'stock_reservation_id' => $reservationId,
+                    'quantity' => $inventoryRows->sum('quantity'),
+                    'tracks_inventory' => ! $unlimitedInventoryIds->contains((int) $line->inventory_id),
+                ]);
+                DB::table('stock_reservation_lines')
+                    ->whereIn('id', $inventoryRows->pluck('id')->skip(1))
+                    ->delete();
+            }
+
+            if (str_starts_with($key, 'purchase:')) {
+                $purchaseId = (int) substr($key, strlen('purchase:'));
+                DB::table('compras')->where('id', $purchaseId)->update([
+                    'stock_reservation_id' => $reservationId,
+                ]);
+                $cartId = DB::table('compras')->where('id', $purchaseId)->value('cart_id');
+                $isCurrent = $cartId !== null
+                    && (int) DB::table('carritos')->where('id', $cartId)->value('current_purchase_id') === $purchaseId;
+
+                if ($status === 'active' && $isCurrent) {
+                    DB::table('carritos')->where('id', $cartId)->update([
+                        'current_stock_reservation_id' => $reservationId,
+                    ]);
+                }
+            } elseif (str_starts_with($key, 'cart:') && $status === 'active') {
+                DB::table('carritos')->where('id', (int) substr($key, strlen('cart:')))->update([
+                    'current_stock_reservation_id' => $reservationId,
+                ]);
+            }
+        }
+
+        if (DB::getDriverName() !== 'sqlite') {
+            Schema::table('stock_reservation_lines', function (Blueprint $table): void {
+                $table->dropForeign('stock_reservations_cart_item_id_foreign');
+                $table->dropForeign('stock_reservations_purchase_id_foreign');
+                $table->dropUnique('stock_reservations_cart_item_id_inventory_id_unique');
+                $table->dropIndex('stock_reservations_purchase_id_status_index');
+                $table->dropIndex('stock_reservations_status_expires_at_index');
+            });
+        }
+
+        Schema::table('stock_reservation_lines', function (Blueprint $table): void {
+            $table->unsignedBigInteger('stock_reservation_id')->nullable(false)->change();
+            $table->dropColumn([
+                'cart_item_id',
+                'purchase_id',
+                'status',
+                'expires_at',
+                'committed_at',
+                'released_at',
+            ]);
+            $table->foreign('stock_reservation_id', 'reservation_lines_reservation_fk')
+                ->references('id')
+                ->on('stock_reservations')
+                ->cascadeOnDelete();
+            $table->unique(
+                ['stock_reservation_id', 'inventory_id'],
+                'reservation_lines_reservation_inventory_unique',
+            );
+        });
+
+        Schema::table('carritos', function (Blueprint $table): void {
+            $table->foreign('current_stock_reservation_id', 'carts_current_stock_reservation_fk')
+                ->references('id')
+                ->on('stock_reservations')
+                ->nullOnDelete();
+            $table->unique('current_stock_reservation_id', 'carts_current_stock_reservation_unique');
+        });
+
+        Schema::table('compras', function (Blueprint $table): void {
+            $table->foreign('stock_reservation_id', 'purchases_stock_reservation_fk')
+                ->references('id')
+                ->on('stock_reservations')
+                ->nullOnDelete();
+            $table->unique('stock_reservation_id', 'purchases_stock_reservation_unique');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('compras', function (Blueprint $table): void {
+            $table->dropUnique('purchases_stock_reservation_unique');
+            $table->dropForeign('purchases_stock_reservation_fk');
+            $table->dropColumn('stock_reservation_id');
+        });
+
+        Schema::table('carritos', function (Blueprint $table): void {
+            $table->dropUnique('carts_current_stock_reservation_unique');
+            $table->dropForeign('carts_current_stock_reservation_fk');
+            $table->dropColumn('current_stock_reservation_id');
+        });
+
+        Schema::dropIfExists('stock_reservation_lines');
+        Schema::dropIfExists('stock_reservations');
+    }
+};

routes/console.php

@@ -15,7 +15,7 @@ Artisan::command('reservations:expire', function (): void {
     $expired = app(ExpireStockReservationsService::class)->expireOverdue();
 
     $this->info("Expired purchases: {$expired['purchases']}");
-    $this->info("Expired cart items: {$expired['cart_items']}");
+    $this->info("Expired cart reservations: {$expired['cart_reservations']}");
 })->purpose('Release expired stock reservations from purchases and abandoned carts');
 
 Schedule::command('reservations:expire')

tests/Feature/Cart/CartControllerTest.php

@@ -5,10 +5,12 @@ namespace Tests\Feature\Cart;
 use App\Domains\Attachable\Enums\AttachmentType;
 use App\Domains\Attachable\Models\Attachment;
 use App\Domains\Auth\Models\User;
+use App\Domains\Cart\Models\Cart;
 use App\Domains\Catalog\Enums\InventoryPolicy;
 use App\Domains\Catalog\Models\CatalogItem;
 use App\Domains\Catalog\Models\Inventory;
 use App\Domains\Catalog\Models\Variant;
+use App\Domains\Catalog\Services\CatalogService;
 use App\Domains\Purchase\Models\Purchase;
 use App\Domains\Purchase\Models\PurchaseItem;
 use App\Domains\Tenant\Models\Tenant;
@@ -28,6 +30,80 @@ class CartControllerTest extends TestCase
         ]));
         $this->assertFalse(Schema::hasColumn('carrito_items', 'buyable_type'));
         $this->assertFalse(Schema::hasColumn('carrito_items', 'buyable_id'));
+        $this->assertTrue(Schema::hasColumns('stock_reservations', [
+            'status',
+            'expires_at',
+            'committed_at',
+            'released_at',
+            'expired_at',
+            'release_reason',
+        ]));
+        $this->assertFalse(Schema::hasColumn('stock_reservations', 'quantity'));
+        $this->assertTrue(Schema::hasColumns('stock_reservation_lines', [
+            'stock_reservation_id',
+            'inventory_id',
+            'quantity',
+            'tracks_inventory',
+        ]));
+        $this->assertTrue(Schema::hasColumn('carritos', 'current_stock_reservation_id'));
+        $this->assertTrue(Schema::hasColumn('compras', 'stock_reservation_id'));
+    }
+
+    public function test_it_aggregates_shared_inventory_into_one_cart_reservation_line(): void
+    {
+        $tenant = $this->createTenant('acme');
+        $firstItem = $this->createDirectItem($tenant, 10, '10.00');
+        $secondItem = app(CatalogService::class)->create([
+            'tenant_code' => $tenant->codigo,
+            'type' => 'bundle',
+            'slug' => 'second-shared-item',
+            'nombre' => 'Second shared item',
+            'precio' => '20.00',
+            'components' => [[
+                'catalog_item_id' => $firstItem->id,
+                'quantity' => 1,
+            ]],
+        ]);
+
+        $firstResponse = $this->postJson('/api/tenants/acme/cart/items', [
+            'catalog_item_id' => $firstItem->id,
+            'cantidad' => 2,
+        ])->assertOk();
+        $guestToken = $firstResponse->getCookie('guest_token', false)?->getValue();
+
+        $this->call(
+            'POST',
+            '/api/tenants/acme/cart/items',
+            [],
+            ['guest_token' => $guestToken],
+            [],
+            ['HTTP_Accept' => 'application/json', 'CONTENT_TYPE' => 'application/json'],
+            json_encode([
+                'catalog_item_id' => $secondItem->id,
+                'cantidad' => 3,
+            ]),
+        )->assertOk();
+
+        $reservationId = (int) $firstResponse->json('data.id');
+        $reservationId = (int) Cart::query()
+            ->findOrFail($reservationId)
+            ->current_stock_reservation_id;
+
+        $this->assertDatabaseCount('stock_reservations', 1);
+        $this->assertDatabaseHas('stock_reservations', [
+            'id' => $reservationId,
+            'status' => 'active',
+        ]);
+        $this->assertDatabaseHas('stock_reservation_lines', [
+            'stock_reservation_id' => $reservationId,
+            'inventory_id' => $firstItem->inventory_id,
+            'quantity' => 5,
+        ]);
+        $this->assertDatabaseCount('stock_reservation_lines', 1);
+        $this->assertDatabaseHas('inventories', [
+            'id' => $firstItem->inventory_id,
+            'reserved_stock' => 5,
+        ]);
     }
 
     public function test_it_adds_a_catalog_item_without_a_variant(): void
@@ -74,9 +150,11 @@ class CartControllerTest extends TestCase
             'id' => $item->inventory_id,
             'reserved_stock' => 2,
         ]);
-        $this->assertDatabaseHas('stock_reservations', [
+        $this->assertDatabaseHas('stock_reservation_lines', [
             'inventory_id' => $item->inventory_id,
             'quantity' => 2,
+        ]);
+        $this->assertDatabaseHas('stock_reservations', [
             'status' => 'active',
         ]);
     }
@@ -96,16 +174,18 @@ class CartControllerTest extends TestCase
         ])->assertOk();
 
         $this->assertDatabaseHas('stock_reservations', [
-            'inventory_id' => $item->inventory_id,
-            'quantity' => 2,
             'status' => 'active',
             'expires_at' => $now->copy()->addMinutes(45)->toDateTimeString(),
         ]);
+        $this->assertDatabaseHas('stock_reservation_lines', [
+            'inventory_id' => $item->inventory_id,
+            'quantity' => 2,
+        ]);
 
         $this->travelBack();
     }
 
-    public function test_it_expires_abandoned_cart_reservations_and_removes_empty_carts(): void
+    public function test_it_expires_abandoned_cart_reservations_without_deleting_the_cart(): void
     {
         config()->set('catalog.stock_reservation_expiration_minutes', 30);
         $tenant = $this->createTenant('acme');
@@ -120,14 +200,14 @@ class CartControllerTest extends TestCase
 
         $this->artisan('reservations:expire')
             ->expectsOutput('Expired purchases: 0')
-            ->expectsOutput('Expired cart items: 0')
+            ->expectsOutput('Expired cart reservations: 0')
             ->assertSuccessful();
 
         $this->travel(31)->minutes();
 
         $this->artisan('reservations:expire')
             ->expectsOutput('Expired purchases: 0')
-            ->expectsOutput('Expired cart items: 1')
+            ->expectsOutput('Expired cart reservations: 1')
             ->assertSuccessful();
 
         $this->assertDatabaseHas('inventories', [
@@ -135,23 +215,25 @@ class CartControllerTest extends TestCase
             'real_stock' => 10,
             'reserved_stock' => 0,
         ]);
-        $this->assertDatabaseMissing('carrito_items', ['id' => $cartItemId]);
+        $this->assertDatabaseHas('carrito_items', ['id' => $cartItemId]);
-        $this->assertSoftDeleted('carritos', [
+        $this->assertDatabaseHas('carritos', [
             'id' => $cartId,
-            'status' => 'expired',
+            'status' => 'active',
+            'current_stock_reservation_id' => null,
+            'deleted_at' => null,
         ]);
         $this->assertDatabaseHas('stock_reservations', [
-            'inventory_id' => $item->inventory_id,
-            'cart_item_id' => null,
-            'purchase_id' => null,
-            'quantity' => 0,
             'status' => 'expired',
             'expires_at' => null,
         ]);
+        $this->assertDatabaseHas('stock_reservation_lines', [
+            'inventory_id' => $item->inventory_id,
+            'quantity' => 2,
+        ]);
 
         $this->artisan('reservations:expire')
             ->expectsOutput('Expired purchases: 0')
-            ->expectsOutput('Expired cart items: 0')
+            ->expectsOutput('Expired cart reservations: 0')
             ->assertSuccessful();
 
         $this->travelBack();
@@ -212,10 +294,11 @@ class CartControllerTest extends TestCase
             'id' => $variant->inventory_id,
             'reserved_stock' => 5,
         ]);
-        $this->assertDatabaseHas('stock_reservations', [
+        $this->assertDatabaseHas('stock_reservation_lines', [
-            'cart_item_id' => $response->json('data.items.0.id'),
             'inventory_id' => $variant->inventory_id,
             'quantity' => 5,
+        ]);
+        $this->assertDatabaseHas('stock_reservations', [
             'status' => 'active',
         ]);
     }
@@ -229,6 +312,7 @@ class CartControllerTest extends TestCase
         $this->createPurchaseItem($tenant, $user, $item, 1);
 
         $this->actingAs($user, 'sanctum')
+            ->withHeader('Accept-Language', 'es')
             ->postJson('/api/tenants/acme/cart/items', [
                 'catalog_item_id' => $item->id,
                 'cantidad' => 2,
@@ -237,6 +321,7 @@ class CartControllerTest extends TestCase
             ->assertJsonPath('data.items.0.cantidad', 2);
 
         $this->actingAs($user, 'sanctum')
+            ->withHeader('Accept-Language', 'es')
             ->postJson('/api/tenants/acme/cart/items', [
                 'catalog_item_id' => $item->id,
                 'cantidad' => 2,
@@ -381,10 +466,12 @@ class CartControllerTest extends TestCase
             'reserved_stock' => 0,
         ]);
         $this->assertDatabaseHas('stock_reservations', [
-            'cart_item_id' => null,
-            'inventory_id' => $variant->inventory_id,
-            'quantity' => 0,
             'status' => 'released',
+            'release_reason' => 'cart_empty',
+        ]);
+        $this->assertDatabaseHas('stock_reservation_lines', [
+            'inventory_id' => $variant->inventory_id,
+            'quantity' => 5,
         ]);
     }
 

tests/Feature/Integration/TelepagosWebhookTest.php

@@ -198,11 +198,16 @@ class TelepagosWebhookTest extends TestCase
             'compra_id' => $newerPurchase->id,
             'cantidad' => 2,
         ]);
+        $newerReservationId = $newerPurchase->fresh()->stock_reservation_id;
+        $this->assertNotNull($newerReservationId);
         $this->assertDatabaseHas('stock_reservations', [
-            'purchase_id' => $newerPurchase->id,
+            'id' => $newerReservationId,
+            'status' => 'active',
+        ]);
+        $this->assertDatabaseHas('stock_reservation_lines', [
+            'stock_reservation_id' => $newerReservationId,
             'inventory_id' => $variant->inventory_id,
             'quantity' => 2,
-            'status' => 'active',
         ]);
 
         $this->assertSoftDeleted('carritos', [

tests/Feature/Purchase/StorePurchaseTest.php

@@ -32,6 +32,45 @@ class StorePurchaseTest extends TestCase
         Queue::fake();
     }
 
+    public function test_checkout_keeps_the_cart_reservation_and_refreshes_its_expiration(): void
+    {
+        config()->set('catalog.stock_reservation_expiration_minutes', 5);
+        config()->set('purchase.checkout_expiration_minutes', 30);
+        $now = now()->startOfSecond();
+        $this->travelTo($now);
+
+        $tenant = $this->createTenant('sonder', 'Sonder', 'sonder.com.ar');
+        $user = User::factory()->create();
+        $variant = $this->createVariantForTenant('sonder', 10, '50.00');
+        $cart = Cart::query()->create([
+            'tenant_codigo' => $tenant->codigo,
+            'user_id' => $user->id,
+            'status' => 'active',
+        ]);
+        $cart->addItem($variant->catalog_item_id, $variant->id, 2);
+        $reservationId = $cart->fresh()->current_stock_reservation_id;
+
+        $this->assertDatabaseHas('stock_reservations', [
+            'id' => $reservationId,
+            'status' => 'active',
+            'expires_at' => $now->copy()->addMinutes(5)->toDateTimeString(),
+        ]);
+
+        $this->travel(2)->minutes();
+        $purchase = app(CheckoutService::class)->startCheckout($tenant, $user->id, [
+            'cart_id' => $cart->id,
+        ]);
+
+        $this->assertSame($reservationId, $purchase->stock_reservation_id);
+        $this->assertDatabaseHas('stock_reservations', [
+            'id' => $reservationId,
+            'status' => 'active',
+            'expires_at' => $now->copy()->addMinutes(32)->toDateTimeString(),
+        ]);
+
+        $this->travelBack();
+    }
+
     public function test_it_starts_checkout_from_cart_with_purchase_item_snapshots(): void
     {
         $tenant = $this->createTenant('sonder', 'Sonder', 'sonder.com.ar');
@@ -119,12 +158,7 @@ class StorePurchaseTest extends TestCase
             'precio_unitario' => '50.00',
             'total' => '100.00',
         ]);
-        $this->assertDatabaseHas('stock_reservations', [
+        $this->assertPurchaseReservation($purchaseId, $inventory->id, 2, 'active');
-            'inventory_id' => $inventory->id,
-            'purchase_id' => $purchaseId,
-            'quantity' => 2,
-            'status' => 'active',
-        ]);
         $this->assertDatabaseHas('carritos', [
             'id' => $cartId,
             'user_id' => $user->id,
@@ -168,12 +202,7 @@ class StorePurchaseTest extends TestCase
             'id' => $cartId,
             'current_purchase_id' => $replacementPurchaseId,
         ]);
-        $this->assertDatabaseHas('stock_reservations', [
+        $this->assertPurchaseReservation($replacementPurchaseId, $inventory->id, 2, 'active');
-            'inventory_id' => $inventory->id,
-            'purchase_id' => $replacementPurchaseId,
-            'quantity' => 2,
-            'status' => 'active',
-        ]);
         $this->assertDatabaseHas('inventories', [
             'id' => $inventory->id,
             'reserved_stock' => 2,
@@ -227,12 +256,7 @@ class StorePurchaseTest extends TestCase
             'precio_unitario' => '50.00',
             'total' => '150.00',
         ]);
-        $this->assertDatabaseHas('stock_reservations', [
+        $this->assertPurchaseReservation($response->json('data.id'), $variant->inventory_id, 3, 'active');
-            'inventory_id' => $variant->inventory_id,
-            'purchase_id' => $response->json('data.id'),
-            'quantity' => 3,
-            'status' => 'active',
-        ]);
         $this->assertDatabaseHas('inventories', [
             'id' => $variant->inventory_id,
             'real_stock' => 10,
@@ -244,10 +268,7 @@ class StorePurchaseTest extends TestCase
             ->assertOk()
             ->assertJsonPath('data.status', Purchase::STATUS_CANCELLED);
 
-        $this->assertDatabaseHas('stock_reservations', [
+        $this->assertPurchaseReservation($response->json('data.id'), $variant->inventory_id, 3, 'released');
-            'purchase_id' => $response->json('data.id'),
-            'status' => 'released',
-        ]);
         $this->assertDatabaseHas('inventories', [
             'id' => $variant->inventory_id,
             'real_stock' => 10,
@@ -296,18 +317,8 @@ class StorePurchaseTest extends TestCase
             'origin' => Cart::ORIGIN_DIRECT_CHECKOUT,
         ]);
         $this->assertDatabaseCount('compra_items', 2);
-        $this->assertDatabaseHas('stock_reservations', [
+        $this->assertPurchaseReservation($purchaseId, $firstVariant->inventory_id, 1, 'active');
-            'inventory_id' => $firstVariant->inventory_id,
+        $this->assertPurchaseReservation($purchaseId, $secondVariant->inventory_id, 1, 'active');
-            'purchase_id' => $purchaseId,
-            'quantity' => 1,
-            'status' => 'active',
-        ]);
-        $this->assertDatabaseHas('stock_reservations', [
-            'inventory_id' => $secondVariant->inventory_id,
-            'purchase_id' => $purchaseId,
-            'quantity' => 1,
-            'status' => 'active',
-        ]);
         $this->assertDatabaseHas('inventories', [
             'id' => $firstVariant->inventory_id,
             'reserved_stock' => 1,
@@ -430,7 +441,7 @@ class StorePurchaseTest extends TestCase
         $tenant = $this->createTenant('sonder', 'Sonder', 'sonder.com.ar');
         $user = User::factory()->create();
         $firstVariant = $this->createVariantForTenant('sonder', 20, '50.00');
-        $firstVariant->catalogItem->update(['max_units_per_user' => 3]);
+        $firstVariant->catalogItem->update(['max_units_per_user' => 4]);
         $secondInventory = Inventory::query()->create(['real_stock' => 20]);
         $secondVariant = Variant::query()->create([
             'catalog_item_id' => $firstVariant->catalog_item_id,
@@ -443,6 +454,7 @@ class StorePurchaseTest extends TestCase
         ]);
         $cart->addItem($firstVariant->catalog_item_id, $firstVariant->id, 2);
         $cart->addItem($secondVariant->catalog_item_id, $secondVariant->id, 2);
+        $firstVariant->catalogItem->update(['max_units_per_user' => 3]);
 
         $this->actingAs($user, 'sanctum')
             ->postJson('/api/tenants/sonder/compras/start-checkout', [
@@ -500,12 +512,17 @@ class StorePurchaseTest extends TestCase
             'id' => $variant->inventory_id,
             'reserved_stock' => 3,
         ]);
+        $activeCart->refresh();
+        $this->assertNotNull($activeCart->current_stock_reservation_id);
         $this->assertDatabaseHas('stock_reservations', [
-            'cart_item_id' => $cartItemId,
+            'id' => $activeCart->current_stock_reservation_id,
-            'purchase_id' => null,
-            'quantity' => 3,
             'status' => 'active',
         ]);
+        $this->assertDatabaseHas('stock_reservation_lines', [
+            'stock_reservation_id' => $activeCart->current_stock_reservation_id,
+            'inventory_id' => $variant->inventory_id,
+            'quantity' => 3,
+        ]);
         $this->assertSame(1, $activeCart->items()->count());
     }
 
@@ -516,6 +533,7 @@ class StorePurchaseTest extends TestCase
         $variant = $this->createVariantForTenant('sonder', 10, '50.00');
         $previousPurchase = $this->createCheckoutPurchase($user, 'sonder', $variant, 2);
         $cart = $previousPurchase->cart;
+        $previousReservationId = $previousPurchase->stock_reservation_id;
 
         $previousPurchase->update([
             'status' => Purchase::STATUS_PENDING_PAYMENT,
@@ -538,11 +556,13 @@ class StorePurchaseTest extends TestCase
             'id' => $cart->id,
             'current_purchase_id' => $currentPurchase->id,
         ]);
+        $this->assertNotSame($previousReservationId, $currentPurchase->stock_reservation_id);
         $this->assertDatabaseHas('stock_reservations', [
-            'purchase_id' => $currentPurchase->id,
+            'id' => $previousReservationId,
-            'quantity' => 2,
+            'status' => 'released',
-            'status' => 'active',
+            'release_reason' => 'purchase_superseded',
         ]);
+        $this->assertPurchaseReservation($currentPurchase->id, $variant->inventory_id, 2, 'active');
 
         try {
             app(CheckoutService::class)->confirmPaidPurchase($previousPurchase->fresh());
@@ -556,11 +576,7 @@ class StorePurchaseTest extends TestCase
             'reserved_stock' => 2,
             'sold_units' => 0,
         ]);
-        $this->assertDatabaseHas('stock_reservations', [
+        $this->assertPurchaseReservation($currentPurchase->id, $variant->inventory_id, 2, 'active');
-            'purchase_id' => $currentPurchase->id,
-            'quantity' => 2,
-            'status' => 'active',
-        ]);
     }
 
     public function test_removing_a_checkout_item_supersedes_the_purchase_and_restores_the_user_quota(): void
@@ -589,11 +605,12 @@ class StorePurchaseTest extends TestCase
             'current_purchase_id' => null,
         ]);
         $this->assertDatabaseHas('stock_reservations', [
-            'inventory_id' => $variant->inventory_id,
-            'cart_item_id' => null,
-            'purchase_id' => null,
-            'quantity' => 0,
             'status' => 'released',
+            'release_reason' => 'purchase_superseded',
+        ]);
+        $this->assertDatabaseHas('stock_reservation_lines', [
+            'inventory_id' => $variant->inventory_id,
+            'quantity' => 2,
         ]);
         $this->assertDatabaseHas('inventories', [
             'id' => $variant->inventory_id,
@@ -628,7 +645,7 @@ class StorePurchaseTest extends TestCase
         ]);
         $this->assertDatabaseHas('inventories', [
             'id' => $variant->inventory_id,
-            'reserved_stock' => 3,
+            'reserved_stock' => 0,
         ]);
         $this->assertDatabaseHas('carritos', [
             'id' => $activeCart->id,
@@ -637,12 +654,7 @@ class StorePurchaseTest extends TestCase
             'current_purchase_id' => null,
             'deleted_at' => null,
         ]);
-        $this->assertDatabaseHas('stock_reservations', [
+        $this->assertPurchaseReservation($purchase->id, $variant->inventory_id, 3, 'expired');
-            'cart_item_id' => $cartItemId,
-            'purchase_id' => null,
-            'quantity' => 3,
-            'status' => 'active',
-        ]);
         $this->assertSame(1, $activeCart->items()->count());
     }
 
@@ -912,10 +924,7 @@ class StorePurchaseTest extends TestCase
             'current_purchase_id' => null,
             'deleted_at' => null,
         ]);
-        $this->assertDatabaseHas('stock_reservations', [
+        $this->assertPurchaseReservation($purchase->id, $variant->inventory_id, 2, 'active');
-            'purchase_id' => $purchase->id,
-            'status' => 'active',
-        ]);
     }
 
     public function test_it_rejects_review_for_a_purchase_that_is_not_awaiting_payment(): void
@@ -957,7 +966,7 @@ class StorePurchaseTest extends TestCase
 
         $this->artisan('reservations:expire')
             ->expectsOutput('Expired purchases: 1')
-            ->expectsOutput('Expired cart items: 0')
+            ->expectsOutput('Expired cart reservations: 0')
             ->assertSuccessful();
 
         $this->assertDatabaseHas('compras', [
@@ -968,15 +977,11 @@ class StorePurchaseTest extends TestCase
             'compra_id' => $purchase->id,
             'cantidad' => 3,
         ]);
-        $this->assertDatabaseHas('stock_reservations', [
+        $this->assertPurchaseReservation($purchase->id, $variant->inventory_id, 3, 'expired');
-            'purchase_id' => null,
-            'quantity' => 3,
-            'status' => 'active',
-        ]);
         $this->assertDatabaseHas('inventories', [
             'id' => $variant->inventory_id,
             'real_stock' => 10,
-            'reserved_stock' => 3,
+            'reserved_stock' => 0,
             'sold_units' => 0,
         ]);
         $this->assertDatabaseHas('carritos', [
@@ -989,7 +994,7 @@ class StorePurchaseTest extends TestCase
 
         $this->artisan('reservations:expire')
             ->expectsOutput('Expired purchases: 0')
-            ->expectsOutput('Expired cart items: 0')
+            ->expectsOutput('Expired cart reservations: 0')
             ->assertSuccessful();
     }
 
@@ -1006,6 +1011,7 @@ class StorePurchaseTest extends TestCase
             'source_catalog_item_id' => $variant->catalog_item_id,
             'source_variant_id' => $variant->id,
             'nombre' => 'Inconsistent item',
+            'item_nombre' => 'Inconsistent item',
             'slug' => 'inconsistent-item',
             'cantidad' => 1,
             'precio_unitario' => '50.00',
@@ -1018,7 +1024,7 @@ class StorePurchaseTest extends TestCase
 
         $this->artisan('reservations:expire')
             ->expectsOutput('Expired purchases: 2')
-            ->expectsOutput('Expired cart items: 0')
+            ->expectsOutput('Expired cart reservations: 0')
             ->assertSuccessful();
 
         $this->assertDatabaseHas('compras', [
@@ -1160,12 +1166,7 @@ class StorePurchaseTest extends TestCase
             'reserved_stock' => 0,
             'sold_units' => 2,
         ]);
-        $this->assertDatabaseHas('stock_reservations', [
+        $this->assertPurchaseReservation($purchase->id, $variant->inventory_id, 2, 'committed');
-            'purchase_id' => $purchase->id,
-            'inventory_id' => $variant->inventory_id,
-            'quantity' => 2,
-            'status' => 'committed',
-        ]);
 
         $this->assertSoftDeleted('carritos', [
             'id' => $purchase->cart_id,
@@ -1440,6 +1441,26 @@ class StorePurchaseTest extends TestCase
         ]);
     }
 
+    protected function assertPurchaseReservation(
+        int $purchaseId,
+        int $inventoryId,
+        int $quantity,
+        string $status,
+    ): void {
+        $reservationId = Purchase::query()->findOrFail($purchaseId)->stock_reservation_id;
+
+        $this->assertNotNull($reservationId);
+        $this->assertDatabaseHas('stock_reservations', [
+            'id' => $reservationId,
+            'status' => $status,
+        ]);
+        $this->assertDatabaseHas('stock_reservation_lines', [
+            'stock_reservation_id' => $reservationId,
+            'inventory_id' => $inventoryId,
+            'quantity' => $quantity,
+        ]);
+    }
+
     protected function createTenant(string $codigo, string $nombre, string $dominio): Tenant
     {
         $hdrKey = (string) Str::uuid();

tests/Feature/Sale/AdminAppSaleControllerTest.php

@@ -520,8 +520,10 @@ class AdminAppSaleControllerTest extends TestCase
             ->assertJsonPath('data.status', Purchase::STATUS_CANCELLED);
 
         $this->assertSoftDeleted('carritos', ['id' => $sourceCartId]);
+        $reservationId = $purchase->fresh()->stock_reservation_id;
+        $this->assertNotNull($reservationId);
         $this->assertDatabaseHas('stock_reservations', [
-            'purchase_id' => $purchase->id,
+            'id' => $reservationId,
             'status' => 'released',
         ]);
     }

tests/Feature/Seeders/DesfilePuraTendenciaSeederTest.php

@@ -300,10 +300,13 @@ class DesfilePuraTendenciaSeederTest extends TestCase
             ->where('user_id', $user->id)
             ->where('source_catalog_item_id', $catalogItemId)
             ->count());
-        $this->assertSame(48, DB::table('stock_reservations')
+        $this->assertSame(1, DB::table('stock_reservations')
-            ->where('purchase_id', $purchase->id)
+            ->where('id', $purchase->stock_reservation_id)
             ->where('status', 'committed')
             ->count());
+        $this->assertSame(48, DB::table('stock_reservation_lines')
+            ->where('stock_reservation_id', $purchase->stock_reservation_id)
+            ->count());
 
         foreach ([
             ['sector' => 'A', 'fila' => '1', 'tipo' => 'NORMAL', 'count' => 16],

tests/Unit/Catalog/ExpireStockReservationsServiceTest.php

@@ -12,7 +12,7 @@ use Tests\TestCase;
 
 class ExpireStockReservationsServiceTest extends TestCase
 {
-    public function test_it_expires_purchases_before_abandoned_cart_items(): void
+    public function test_it_expires_purchases_before_abandoned_cart_reservations(): void
     {
         $checkout = \Mockery::mock(CheckoutService::class);
         $checkout->shouldReceive('expireOverduePurchases')
@@ -36,7 +36,7 @@ class ExpireStockReservationsServiceTest extends TestCase
             ->with('Stock reservation cleanup completed.', [
                 'command' => 'reservations:expire',
                 'expired_purchases' => 2,
-                'expired_cart_items' => 3,
+                'expired_cart_reservations' => 3,
                 'total_expired' => 5,
             ]);
 
@@ -44,7 +44,7 @@ class ExpireStockReservationsServiceTest extends TestCase
 
         $this->assertSame([
             'purchases' => 2,
-            'cart_items' => 3,
+            'cart_reservations' => 3,
         ], $result);
     }
 
@@ -67,7 +67,7 @@ class ExpireStockReservationsServiceTest extends TestCase
             ->with('Stock reservation cleanup failed.', [
                 'command' => 'reservations:expire',
                 'expired_purchases' => 2,
-                'expired_cart_items' => null,
+                'expired_cart_reservations' => null,
                 'exception' => $exception,
             ]);