refactor(database): remove id from account_balances table

- Menghapus kolom `id` dari tabel `account_balances` termasuk primary key auto-increment-nya.
- Menjadikan kolom `account_number` dan `period` sebagai composite primary key.
- Menghapus constraint unik pada kolom `account_number` dan `period`.
- Menambahkan kembali kolom `id` dan constraint unik pada proses rollback.
- Memastikan mendukung migrasi maju dan mundur dengan aman.

database/migrations/2025_05_24_082504_remove_id_from_account_balances_table.php

@@ -0,0 +1,42 @@
+<?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('account_balances', function (Blueprint $table) {
+                // First drop the unique constraint since we'll be making these columns the primary key
+                $table->dropUnique(['account_number', 'period']);
+
+                // Drop the id column and its auto-increment primary key
+                $table->dropColumn('id');
+
+                // Set the composite primary key
+                $table->primary(['account_number', 'period']);
+            });
+        }
+
+        /**
+         * Reverse the migrations.
+         */
+        public function down(): void
+        {
+            Schema::table('account_balances', function (Blueprint $table) {
+                // Drop the composite primary key
+                $table->dropPrimary(['account_number', 'period']);
+
+                // Add back the id column with auto-increment
+                $table->id()->first();
+
+                // Re-add the unique constraint
+                $table->unique(['account_number', 'period']);
+            });
+        }
+    };