How remove duplicates from Laravel equivalent result

I beginner in Laravel. I use in my project Laravel 5.8. I have this code:

Schema::create('db_id', function (Blueprint $table) {
            $table->bigIncrements('id');
            $table->unsignedBigInteger('user_id1')->nullable();
            $table->foreign('user_id1')->references('id')->on('users')->onDelete('cascade');
            $table->unsignedBigInteger('user_id2')->nullable();
            $table->foreign('user_id2')->references('id')->on('users')->onDelete('cascade');
            $table->string('token', 240);
            $table->char('status', 1)->default(0);
            $table->dateTime('last_message')->nullable();
            $table->dateTime('read_at')->nullable();
            $table->engine = "InnoDB";
            $table->charset = 'utf8mb4';
            $table->collation = 'utf8mb4_unicode_ci';
        });

When I run this code:

DbID::where('user_id2', '=', Auth::user()->id)->orWhere('user_id1',  Auth::user()->id)->orderBy('last_message', 'DESC')->get();

Sometimes I have duplications.

In my db I have record with user_id2 and user_id1 - Auth::user()->id.

I need show this record only one.

How can I fix it?

via Chebli Mohamed