diff --git a/app/Services/Pacs/DicomUtils.php b/app/Services/Pacs/DicomUtils.php
index 89e5f21..3e97a56 100644
--- a/app/Services/Pacs/DicomUtils.php
+++ b/app/Services/Pacs/DicomUtils.php
@@ -18,7 +18,7 @@ public static function dateToCarbon(?string $datePart, string $timezone = 'UTC')
 
     public static function dateTimeToCarbon(?string $datePart, ?string $timePart, string $timezone = 'UTC'): ?Carbon
     {
-        if ($datePart === null || $timePart === null) {
+        if (blank($datePart) || blank($timePart)) {
             return null;
         }
 
diff --git a/app/Services/Pacs/InstituteMapper.php b/app/Services/Pacs/InstituteMapper.php
index 6bd5793..7fc63df 100644
--- a/app/Services/Pacs/InstituteMapper.php
+++ b/app/Services/Pacs/InstituteMapper.php
@@ -13,7 +13,7 @@ final class InstituteMapper
 
     private static int $catchAll = -1;
 
-    public static function map(string $input): int
+    public static function map(?string $input): int
     {
         if (empty(self::$patterns)) {
             self::$patterns = Cache::remember('institute_names', now()->addDay(), function () {
@@ -22,11 +22,13 @@ public static function map(string $input): int
             self::$catchAll = DB::table('institutes')->first('id')->id;
         }
 
-        $input = strtolower($input);
+        if (! blank($input)) {
+            $input = strtolower($input);
 
-        foreach (self::$patterns as $pattern) {
-            if (InputMatcher::match($input, $pattern->name, NameMatchModes::from($pattern->match_mode))) {
-                return $pattern->institute_id;
+            foreach (self::$patterns as $pattern) {
+                if (InputMatcher::match($input, $pattern->name, NameMatchModes::from($pattern->match_mode))) {
+                    return $pattern->institute_id;
+                }
             }
         }
 
diff --git a/app/Services/Pacs/Sync/StudiesSync.php b/app/Services/Pacs/Sync/StudiesSync.php
index 7fbd6cd..858e474 100644
--- a/app/Services/Pacs/Sync/StudiesSync.php
+++ b/app/Services/Pacs/Sync/StudiesSync.php
@@ -119,7 +119,7 @@ public function transformData(mixed $orthanc_src): array
             'study_modality' => data_get($orthanc_src, 'RequestedTags.Modality'),
             'body_part_examined' => data_get($orthanc_src, 'RequestedTags.BodyPartExamined'),
 
-            'study_date' => DicomUtils::dateTimeToCarbon($orthanc_src['MainDicomTags']['StudyDate'], $orthanc_src['MainDicomTags']['StudyTime']),
+            'study_date' => DicomUtils::dateTimeToCarbon($orthanc_src['MainDicomTags']['StudyDate'], $orthanc_src['MainDicomTags']['StudyTime']) ?? now('UTC'),
             'received_at' => Carbon::parse($orthanc_src['LastUpdate'], 'UTC'),
 
             'image_count' => data_get($orthanc_src, 'Statistics.CountInstances'),
diff --git a/database/migrations/2024_12_27_060234_create_studies_table.php b/database/migrations/2024_12_27_060234_create_studies_table.php
index f94b9a4..fa27882 100644
--- a/database/migrations/2024_12_27_060234_create_studies_table.php
+++ b/database/migrations/2024_12_27_060234_create_studies_table.php
@@ -34,12 +34,12 @@ public function up(): void
 
             $table->string('referring_physician_name')->nullable();
             $table->string('study_modality', 4)->nullable();
-            $table->dateTime('study_date');
-
-            $table->dateTime('received_at');
-            $table->dateTime('assigned_at')->nullable();
-            $table->dateTime('reported_at')->nullable();
-            $table->dateTime('authorized_at')->nullable();
+            $table->timestamp('study_date');
+            $table->timestamp('received_at');
+            $table->timestamp('assigned_at')->nullable();
+            $table->timestamp('reported_at')->nullable();
+            $table->timestamp('authorized_at')->nullable();
+            $table->timestamp('archived_at')->nullable();
 
             $table->foreignIdFor(Institute::class)->constrained()->cascadeOnDelete();
             $table->foreignIdFor(Facility::class)->nullable()->constrained()->cascadeOnDelete();
diff --git a/database/migrations/2024_12_30_152300_create_audit_logs_table.php b/database/migrations/2024_12_30_152300_create_audit_logs_table.php
index 2a72485..895eb83 100644
--- a/database/migrations/2024_12_30_152300_create_audit_logs_table.php
+++ b/database/migrations/2024_12_30_152300_create_audit_logs_table.php
@@ -19,8 +19,7 @@ public function up(): void
             $table->string('orthanc_uuid')->nullable();
             $table->text('url')->nullable();
             $table->text('notes')->nullable();
-
-            $table->timestamps();
+            $table->timestamp('created_at');
         });
     }
 
diff --git a/database/migrations/2024_12_31_102417_create_settings_table.php b/database/migrations/2024_12_31_102417_create_settings_table.php
index b06322a..ed5da91 100644
--- a/database/migrations/2024_12_31_102417_create_settings_table.php
+++ b/database/migrations/2024_12_31_102417_create_settings_table.php
@@ -9,7 +9,7 @@
     public function up(): void
     {
         Schema::create(config('settings.table'), function (Blueprint $table) {
-            $table->bigIncrements('id');
+            $table->id();
             $table->string('key')->unique()->index();
             $table->longText('value')->nullable();
         });