feat(wg): wg_traffic_samples table + model

app/Models/WgTrafficSample.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class WgTrafficSample extends Model
+{
+    public $timestamps = false;
+
+    protected $guarded = [];
+
+    protected $casts = [
+        'rx' => 'integer',
+        'tx' => 'integer',
+        'sampled_at' => 'datetime',
+    ];
+}

database/migrations/2026_06_20_000010_create_wg_traffic_samples_table.php

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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('wg_traffic_samples', function (Blueprint $table) {
+            $table->id();
+            $table->string('peer_pubkey');
+            $table->string('peer_name')->nullable();
+            $table->unsignedBigInteger('rx')->default(0);
+            $table->unsignedBigInteger('tx')->default(0);
+            $table->timestamp('sampled_at')->index();
+            $table->index(['peer_pubkey', 'sampled_at']);
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('wg_traffic_samples');
+    }
+};

tests/Feature/WgTrafficSampleTest.php

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+<?php
+
+namespace Tests\Feature;
+
+use App\Models\WgTrafficSample;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Carbon;
+use Tests\TestCase;
+
+class WgTrafficSampleTest extends TestCase
+{
+    use RefreshDatabase;
+
+    public function test_persists_and_casts_a_sample(): void
+    {
+        $s = WgTrafficSample::create([
+            'peer_pubkey' => 'abc', 'peer_name' => 'laptop', 'rx' => 1000, 'tx' => 2000, 'sampled_at' => now(),
+        ]);
+
+        $this->assertDatabaseHas('wg_traffic_samples', ['peer_pubkey' => 'abc', 'rx' => 1000]);
+        $this->assertInstanceOf(Carbon::class, $s->fresh()->sampled_at);
+    }
+}