feat(webstatement): optimize customer data processing with batch handling

- Tambahkan konstanta `CHUNK_SIZE` untuk memproses data dalam ukuran batch guna mengurangi penggunaan memori.
- Perkenalkan properti baru `customerBatch` untuk menyimpan data sementara sebelum disimpan ke database.
- Ubah metode `processRow` agar menambahkan data ke batch menggunakan metode baru `addToBatch` daripada langsung menyimpannya.
- Tambahkan metode `saveBatch` untuk melakukan penyimpanan batch secara bulk menggunakan `Customer::upsert` dengan pengelolaan kolom unik dan kolom yang perlu diperbarui.
- Tambahkan log untuk setiap chunk yang telah berhasil diproses, membantu memonitor progres saat pemrosesan file CSV dengan ukuran besar.
- Pastikan sisa data yang belum diproses di akhir loop juga disimpan dengan memanggil `saveBatch`.
- Tangani kegagalan penyimpanan batch dengan log error dan reset batch untuk menghindari re-pemrosesan data yang gagal.
- Optimalkan performa dengan menambahkan timestamp (`created_at` dan `updated_at`) secara langsung saat menambahkan data ke batch.

app/Jobs/ProcessCustomerDataJob.php

@@ -20,10 +20,12 @@
         private const MAX_EXECUTION_TIME = 86400; // 24 hours in seconds
         private const FILENAME           = 'ST.CUSTOMER.csv';
         private const DISK_NAME          = 'sftpStatement';
+        private const CHUNK_SIZE         = 1000; // Process data in chunks to reduce memory usage
 
         private string $period = '';
         private int    $processedCount = 0;
         private int    $errorCount     = 0;
+        private array  $customerBatch  = [];
 
         /**
          * Create a new job instance.
@@ -61,6 +63,7 @@
             set_time_limit(self::MAX_EXECUTION_TIME);
             $this->processedCount = 0;
             $this->errorCount     = 0;
+            $this->customerBatch  = [];
         }
 
         private function processPeriod()
@@ -111,10 +114,23 @@
 
             $headers  = (new Customer())->getFillable();
             $rowCount = 0;
+            $chunkCount = 0;
 
             while (($row = fgetcsv($handle, 0, self::CSV_DELIMITER)) !== false) {
                 $rowCount++;
                 $this->processRow($row, $headers, $rowCount, $filePath);
+
+                // Process in chunks to avoid memory issues
+                if (count($this->customerBatch) >= self::CHUNK_SIZE) {
+                    $this->saveBatch();
+                    $chunkCount++;
+                    Log::info("Processed chunk $chunkCount ({$this->processedCount} records so far)");
+                }
+            }
+
+            // Process any remaining records
+            if (!empty($this->customerBatch)) {
+                $this->saveBatch();
             }
 
             fclose($handle);
@@ -131,17 +147,24 @@
             }
 
             $data = array_combine($headers, $row);
-            $this->saveRecord($data, $rowCount, $filePath);
+            $this->addToBatch($data, $rowCount, $filePath);
         }
 
-        private function saveRecord(array $data, int $rowCount, string $filePath)
+        /**
+         * Add record to batch instead of saving immediately
+         */
+        private function addToBatch(array $data, int $rowCount, string $filePath)
         : void
         {
             try {
                 if (isset($data['customer_code']) && $data['customer_code'] !== 'customer_code') {
-                    $customer = Customer::firstOrNew(['customer_code' => $data['customer_code']]);
-                    $customer->fill($data);
-                    $customer->save();
+                    // Add timestamp fields
+                    $now = now();
+                    $data['created_at'] = $now;
+                    $data['updated_at'] = $now;
+
+                    // Add to customer batch
+                    $this->customerBatch[] = $data;
                     $this->processedCount++;
                 }
             } catch (Exception $e) {
@@ -150,6 +173,32 @@
             }
         }
 
+        /**
+         * Save batched records to the database
+         */
+        private function saveBatch()
+        : void
+        {
+            try {
+                if (!empty($this->customerBatch)) {
+                    // Bulk insert/update customers
+                    Customer::upsert(
+                        $this->customerBatch,
+                        ['customer_code'], // Unique key
+                        array_diff((new Customer())->getFillable(), ['customer_code']) // Update columns
+                    );
+
+                    // Reset customer batch after processing
+                    $this->customerBatch = [];
+                }
+            } catch (Exception $e) {
+                Log::error("Error in saveBatch: " . $e->getMessage());
+                $this->errorCount += count($this->customerBatch);
+                // Reset batch even if there's an error to prevent reprocessing the same failed records
+                $this->customerBatch = [];
+            }
+        }
+
         private function cleanup(string $tempFilePath)
         : void
         {