fix: hapus violation jika status berubah dari alpha ke hadir

Sebelumnya violation hanya di-create/update, tidak pernah
dihapus. Jika guru edit jurnal dari alpha jadi hadir, violation
lama tetap ada.

Sekarang: untuk setiap siswa dalam push, sistem cek:
- alpha > 0: create/update violation
- alpha = 0 & ada violation lama: hapus (soft delete)
- siswa tidak ada di push: violation tidak disentuh

app/Http/Controllers/Api/AttendanceSyncController.php

@@ -57,6 +57,7 @@ class AttendanceSyncController extends Controller
 
         $alphaCounts = [];
         $alphaDate = null;
+        $allStudentIdsInPush = []; // track all students for cleanup
 
         foreach ($attendances as $item) {
             $sourceId = $item['source_student_id'];
@@ -68,6 +69,7 @@ class AttendanceSyncController extends Controller
             }
 
             $localStudentId = $studentMap[$sourceId];
+            $allStudentIdsInPush[$localStudentId] = true;
 
             $statusMap = [
                 'present' => 'hadir',
@@ -107,35 +109,35 @@ class AttendanceSyncController extends Controller
             }
         }
 
-        // Auto-generate / update violations for alpha students
+        // Auto-generate / update / hapus violations untuk alpha siswa di push ini
-        if (!empty($alphaCounts)) {
         $alphaType = ViolationType::where('slug', 'alpha')->first();
 
         if ($alphaType) {
             $violationService = app(\App\Services\ViolationService::class);
-                foreach ($alphaCounts as $studentId => $count) {
-                    try {
-                        $points = max(1, (int) round(($alphaType->points / 10) * $count));
-                        $desc = "Alpha - Tidak hadir tanpa keterangan ({$count} jam pelajaran)";
 
-                        // Cek apakah sudah ada pelanggaran alpha untuk siswa+ tanggal+type yang sama
+            foreach ($allStudentIdsInPush as $studentId => $_) {
-                        // (system-generated: recorded_by IS NULL)
+                try {
+                    $count = $alphaCounts[$studentId] ?? 0;
+
+                    // Cari existing system-generated violation
                     $existing = \App\Models\Violation::where('student_id', $studentId)
                         ->where('violation_type_id', $alphaType->id)
                         ->where('violation_date', $alphaDate)
                         ->whereNull('recorded_by')
                         ->first();
 
+                    if ($count > 0) {
+                        // Ada alpha → buat/update violation
+                        $points = max(1, (int) round(($alphaType->points / 10) * $count));
+                        $desc = "Alpha - Tidak hadir tanpa keterangan ({$count} jam pelajaran)";
+
                         if ($existing) {
-                            // Update existing violation (points & description mungkin berubah)
                             $existing->update([
                                 'points' => $points,
                                 'description' => $desc,
                                 'notes' => 'Diperbarui otomatis dari sinkron E-Jurnal.',
                             ]);
-                            $results['violations']++;
                         } else {
-                            // Buat baru (via service biar notifikasi & SP threshold jalan)
                             $violationService->recordViolation([
                                 'student_id' => $studentId,
                                 'violation_type_id' => $alphaType->id,
@@ -145,16 +147,20 @@ class AttendanceSyncController extends Controller
                                 'notes' => 'Dibuat otomatis dari sinkron E-Jurnal.',
                                 'evidences' => [],
                             ], null);
+                        }
+                        $results['violations']++;
+                    } elseif ($existing) {
+                        // Tidak ada alpha tapi ada violation lama → hapus (ganti status ke hadir)
+                        $existing->delete();
                         $results['violations']++;
                     }
                 } catch (\Exception $e) {
-                        $results['errors'][] = "Violation failed for student={$studentId}: " . $e->getMessage();
+                    $results['errors'][] = "Violation sync failed for student={$studentId}: " . $e->getMessage();
                 }
             }
         } else {
             $results['errors'][] = 'Violation type "Alpha" not found. Create a violation type with slug "alpha".';
         }
-        }
 
         return response()->json([
             'success' => true,