feat: derive calendar date range from price configurations

src/Repository/Groups/AccommodationPriceRepository.php

@@ -41,4 +41,33 @@ class AccommodationPriceRepository extends ServiceEntityRepository
             ->getQuery()
             ->getResult();
     }
+
+    /**
+     * The outer bounds of every persisted price period for the accommodation, or null when it has none.
+     *
+     * @return array{from: \DateTimeImmutable, to: \DateTimeImmutable}|null
+     */
+    public function findPricedDateBoundsByHotelCode(string $hotelCode): ?array
+    {
+        /** @var array{minFrom: string|null, maxTo: string|null} $bounds */
+        $bounds = $this->createQueryBuilder('ap')
+            ->select('MIN(ap.dateFrom) AS minFrom', 'MAX(ap.dateTo) AS maxTo')
+            ->join('ap.accommodation', 'a')
+            ->where('a.calendarCode = :hotelCode')
+            ->setParameter('hotelCode', $hotelCode)
+            ->getQuery()
+            ->getSingleResult();
+
+        // An aggregate over no rows still returns one row, with both bounds null.
+        if (null === $bounds['minFrom'] || null === $bounds['maxTo']) {
+            return null;
+        }
+
+        // Both columns are DATE_IMMUTABLE, so the aggregates come back as Y-m-d and land at 00:00 -
+        // the same normalisation the day-by-day comparisons downstream expect.
+        return [
+            'from' => new \DateTimeImmutable($bounds['minFrom']),
+            'to' => new \DateTimeImmutable($bounds['maxTo']),
+        ];
+    }
 }