Fix PostgreSQL SUBSTRING on timestamp: use CAST AS DATE with native SQL

SUBSTRING does not work on timestamp in PostgreSQL. Use native SQL
with CAST(created_at AS DATE) for daily chart aggregation.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/Controller/AdminController.php

@@ -768,25 +768,17 @@ class AdminController extends AbstractController
             ->getArrayResult();
 
         // Daily chart data
-        $visitorsPerDay = $em->createQueryBuilder()
+        $conn = $em->getConnection();
-            ->select("SUBSTRING(v.createdAt, 1, 10) AS day, COUNT(v.id) AS cnt")
-            ->from(AnalyticsUniqId::class, 'v')
-            ->where('v.createdAt >= :since')
-            ->setParameter('since', $since)
-            ->groupBy('day')
-            ->orderBy('day', 'ASC')
-            ->getQuery()
-            ->getArrayResult();
 
-        $pageviewsPerDay = $em->createQueryBuilder()
+        $visitorsPerDay = $conn->executeQuery(
-            ->select("SUBSTRING(e.createdAt, 1, 10) AS day, COUNT(e.id) AS cnt")
+            'SELECT CAST(created_at AS DATE) AS day, COUNT(*) AS cnt FROM analytics_uniq_id WHERE created_at >= :since GROUP BY day ORDER BY day ASC',
-            ->from(AnalyticsEvent::class, 'e')
+            ['since' => $since->format('Y-m-d H:i:s')],
-            ->where('e.createdAt >= :since')
+        )->fetchAllAssociative();
-            ->setParameter('since', $since)
+
-            ->groupBy('day')
+        $pageviewsPerDay = $conn->executeQuery(
-            ->orderBy('day', 'ASC')
+            'SELECT CAST(created_at AS DATE) AS day, COUNT(*) AS cnt FROM analytics_event WHERE created_at >= :since GROUP BY day ORDER BY day ASC',
-            ->getQuery()
+            ['since' => $since->format('Y-m-d H:i:s')],
-            ->getArrayResult();
+        )->fetchAllAssociative();
 
         // Merge into aligned arrays
         $allDays = [];
@@ -794,8 +786,16 @@ class AdminController extends AbstractController
         foreach ($pageviewsPerDay as $r) { $allDays[$r['day']] = true; }
         ksort($allDays);
 
-        $visitorsMap = array_column($visitorsPerDay, 'cnt', 'day');
+        $visitorsMap = [];
-        $pageviewsMap = array_column($pageviewsPerDay, 'cnt', 'day');
+        foreach ($visitorsPerDay as $r) {
+            $d = $r['day'] instanceof \DateTimeInterface ? $r['day']->format('Y-m-d') : (string) $r['day'];
+            $visitorsMap[$d] = (int) $r['cnt'];
+        }
+        $pageviewsMap = [];
+        foreach ($pageviewsPerDay as $r) {
+            $d = $r['day'] instanceof \DateTimeInterface ? $r['day']->format('Y-m-d') : (string) $r['day'];
+            $pageviewsMap[$d] = (int) $r['cnt'];
+        }
 
         $chartLabels = array_keys($allDays);
         $chartVisitors = array_map(fn ($d) => (int) ($visitorsMap[$d] ?? 0), $chartLabels);