diff --git a/app/Jobs/GenerateClosingBalanceReportJob.php b/app/Jobs/GenerateClosingBalanceReportJob.php
index 6eb82bb..86da8ec 100644
--- a/app/Jobs/GenerateClosingBalanceReportJob.php
+++ b/app/Jobs/GenerateClosingBalanceReportJob.php
@@ -177,7 +177,8 @@ class GenerateClosingBalanceReportJob implements ShouldQueue
                 $insertChunks = array_chunk($allProcessedData, 1000);
 
                 foreach ($insertChunks as $chunk) {
-                    DB::table('processed_closing_balances')->insert($chunk);
+                    // Menggunakan insertOrIgnore untuk mengabaikan duplikasi dan mencegah error unique constraint
+                    DB::table('processed_closing_balances')->insertOrIgnore($chunk);
                 }
 
                 Log::info('All processed data inserted successfully', [
@@ -527,35 +528,17 @@ class GenerateClosingBalanceReportJob implements ShouldQueue
     private function prepareProcessedClosingBalanceData($transactions, &$runningBalance, &$sequenceNo): array
     {
         $processedData = [];
-        $seenReferences = [];
-
-        // Buat lookup array untuk validasi cepat - periksa kombinasi trans_reference + amount_lcy
-        $existingReferences = ProcessedClosingBalance::where('account_number', $this->accountNumber)
-            ->where('period', $this->period)
-            ->where('group_name', $this->groupName)
-            ->get(['trans_reference', 'amount_lcy'])
-            ->map(function ($item) {
-                return md5($item->trans_reference . '_' . $item->amount_lcy);
-            })
-            ->toArray();
-
-        // Buat lookup array untuk validasi cepat
-        $existingReferences = array_flip($existingReferences);
 
         foreach ($transactions as $transaction) {
             // Validasi duplikasi berbasis trans_reference + amount_lcy + booking_date
             $uniqueKey = md5($transaction->trans_reference . '_' . $transaction->amount_lcy);
 
-            if (isset($seenReferences[$uniqueKey])) {
-                Log::warning('Duplicate transaction skipped', [
-                    'trans_reference' => $transaction->trans_reference,
-                    'amount_lcy' => $transaction->amount_lcy
-                ]);
-                continue;
-            }
+            $existingReferences = ProcessedClosingBalance::select('unique_hash')
+                ->where('unique_hash', $uniqueKey)
+                ->get();
 
             // Periksa kombinasi trans_reference + amount_lcy, bukan hanya trans_reference
-            if (isset($existingReferences[$uniqueKey])) {
+            if ($existingReferences->count() > 0) {
                 Log::warning('Transaction already exists in database', [
                     'trans_reference' => $transaction->trans_reference,
                     'amount_lcy' => $transaction->amount_lcy
@@ -610,7 +593,7 @@ class GenerateClosingBalanceReportJob implements ShouldQueue
                 'created_at' => now(),
                 'updated_at' => now(),
                 // Tambahkan hash unik untuk memastikan keunikan
-                'unique_hash' => md5($this->accountNumber . $this->period . $this->groupName . $transaction->trans_reference . $transaction->amount_lcy . $transaction->booking_date)
+                'unique_hash' => md5($transaction->trans_reference . '_' . $transaction->amount_lcy)
             ];
         }
 
diff --git a/app/Models/ProcessedClosingBalance.php b/app/Models/ProcessedClosingBalance.php
index b82171a..b8b3e57 100644
--- a/app/Models/ProcessedClosingBalance.php
+++ b/app/Models/ProcessedClosingBalance.php
@@ -35,7 +35,8 @@ class ProcessedClosingBalance extends Model
         'ref_no',
         'merchant_id',
         'term_id',
-        'closing_balance'
+        'closing_balance',
+        'unique_hash',
     ];
 
     protected $casts = [
diff --git a/database/migrations/2025_07_31_035159_add_unique_hash_field_to_processed_closing_balances_table.php b/database/migrations/2025_07_31_035159_add_unique_hash_field_to_processed_closing_balances_table.php
new file mode 100644
index 0000000..75718fa
--- /dev/null
+++ b/database/migrations/2025_07_31_035159_add_unique_hash_field_to_processed_closing_balances_table.php
@@ -0,0 +1,28 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::table('processed_closing_balances', function (Blueprint $table) {
+            $table->string('unique_hash')->after('id')->unique();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('processed_closing_balances', function (Blueprint $table) {
+            $table->dropColumn('unique_hash');
+        });
+    }
+};