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<?php
use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;
return new class extends Migration
{
public function up(): void
{
Schema::create('variants', function (Blueprint $table) {
$table->char('id', 26)->primary();
$table->char('experiment_id', 26);
$table->string('key', 64);
$table->integer('weight'); // 0-100
$table->text('description')->nullable();
$table->boolean('is_control')->default(false);
// Deterministic position ID — bucketing lookup is a single linear
// pass ordered by `position`.
$table->integer('position');
$table->timestamps();
$table->foreign('experiment_id')->references('id')->on('experiments')->cascadeOnDelete();
$table->unique(['experiment_id', 'key']);
$table->index(['experiment_id', 'position']);
});
}
public function down(): void
{
Schema::dropIfExists('variants');
}
};