diff --git a/src/database/migrations/0001_00_00_000000_create_sessions_table.php b/src/database/migrations/0001_00_00_000000_create_sessions_table.php
index 1f3d68f..dc6307f 100644
--- a/src/database/migrations/0001_00_00_000000_create_sessions_table.php
+++ b/src/database/migrations/0001_00_00_000000_create_sessions_table.php
@@ -15,12 +15,12 @@ return new class extends Migration
     {
         Schema::create('sessions', function (Blueprint $table) {
             $table->string('id')->primary();
-            $table->string('user_id', 64);
+            $table->string('user_id', 64)->nullable()->index();
             $table->string('ip_address', 45)->nullable();
             $table->text('user_agent')->nullable()->index();
             $table->text('payload');
             $table->integer('last_activity')->index();
-            $table->timestamp('vr_last_activity_at')->virtualAs('FROM_UNIXTIME(last_activity)');
+            $table->timestamp('vrt_last_activity_at')->virtualAs('FROM_UNIXTIME(last_activity)');
         });
     }