diff --git a/config/database.php b/config/database.php
index 42ecfe2..bdaf8b9 100644
--- a/config/database.php
+++ b/config/database.php
@@ -1,5 +1,7 @@
 <?php
 
+use Illuminate\Database\DBAL\TimestampType;
+
 return [
 
     /*
@@ -124,4 +126,10 @@ return [
 
     ],
 
+    'dbal' => [
+        'types' => [
+            'timestamp' => TimestampType::class,
+        ],
+    ],
+
 ];
diff --git a/database/migrations/2025_11_13_171048_fix_coupon_nullable_fields.php b/database/migrations/2025_11_13_171048_fix_coupon_nullable_fields.php
new file mode 100644
index 0000000..adaa2b3
--- /dev/null
+++ b/database/migrations/2025_11_13_171048_fix_coupon_nullable_fields.php
@@ -0,0 +1,35 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Schema;
+
+class FixCouponNullableFields extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('coupon', function (Blueprint $table) {
+            // Change from 0000-00-00 00:00:00 to current_timestamp. No need to revert.
+            $table->timestamp('coupon_createdate')->useCurrent()->change();
+            $table->integer('coupon_limitquantity')->nullable()->default(null)->change();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::table('coupon', function (Blueprint $table) {
+            $table->integer('coupon_limitquantity')->nullable(false)->default(1)->change();
+        });
+    }
+}