step 1, 2 and 3 of the implementation plan

database/migrations/2026_02_03_083000_create_sessions_table.php

@@ -0,0 +1,38 @@
+<?php
+
+declare(strict_types=1);
+
+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::create('questionnaire_sessions', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('user_id')->constrained()->cascadeOnDelete();
+            $table->foreignId('category_id')->constrained();
+            $table->foreignId('screening_id')->nullable()->constrained()->nullOnDelete();
+            $table->string('status', 50)->default('in_progress');
+            $table->integer('score')->nullable();
+            $table->string('result', 50)->nullable();
+            $table->json('basic_info')->nullable();
+            $table->text('additional_comments')->nullable();
+            $table->timestamp('completed_at')->nullable();
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('questionnaire_sessions');
+    }
+};