feat: replace custom discount with absolute value in favor of percentage

src/Entity/Groups/AccommodationBooking.php

@@ -156,13 +156,14 @@ class AccommodationBooking implements BlameableEntityInterface, TimestampableEnt
     #[Assert\Range(min: 1, max: 100)]
     private ?int $additionalServicesDiscount = null;
 
+    /** Absolute discount on the total, in minor units. Applied after the three section discounts. */
     #[ORM\Column(nullable: true)]
-    #[Assert\Range(min: 1, max: 100)]
-    private ?int $totalDiscount = null;
+    #[Assert\Positive]
+    private ?int $totalDiscountAmount = null;
 
     #[ORM\Column(length: 255, nullable: true)]
     #[Assert\Expression(
-        'null === this.getTotalDiscount() or (null !== value and "" !== value)',
+        'null === this.getTotalDiscountAmount() or (null !== value and "" !== value)',
         message: 'Bitte eine Bezeichnung für den Rabatt angeben.',
     )]
     private ?string $totalDiscountLabel = null;
@@ -649,14 +650,14 @@ class AccommodationBooking implements BlameableEntityInterface, TimestampableEnt
         return $this;
     }
 
-    public function getTotalDiscount(): ?int
+    public function getTotalDiscountAmount(): ?int
     {
-        return $this->totalDiscount;
+        return $this->totalDiscountAmount;
     }
 
-    public function setTotalDiscount(?int $totalDiscount): self
+    public function setTotalDiscountAmount(?int $totalDiscountAmount): self
     {
-        $this->totalDiscount = $totalDiscount;
+        $this->totalDiscountAmount = $totalDiscountAmount;
 
         return $this;
     }