diff --git a/app/Models/Bucket.php b/app/Models/Bucket.php
index 5c8bac4..08ee63d 100644
--- a/app/Models/Bucket.php
+++ b/app/Models/Bucket.php
@@ -3,6 +3,7 @@
 namespace App\Models;
 
 use App\Enums\BucketAllocationTypeEnum;
+use App\Models\Traits\HasUuid;
 use Database\Factories\BucketFactory;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
@@ -11,6 +12,7 @@
 
 /**
  * @property int $id
+ * @property string $uuid
  * @property int $scenario_id
  * @property Scenario $scenario
  * @property string $name
@@ -24,7 +26,7 @@
 class Bucket extends Model
 {
     /** @use HasFactory<BucketFactory> */
-    use HasFactory;
+    use HasFactory, HasUuid;
 
     protected $fillable = [
         'scenario_id',
diff --git a/app/Models/Draw.php b/app/Models/Draw.php
index a262d08..8226329 100644
--- a/app/Models/Draw.php
+++ b/app/Models/Draw.php
@@ -4,6 +4,7 @@
 
 use App\Models\Traits\HasAmount;
 use App\Models\Traits\HasProjectionStatus;
+use App\Models\Traits\HasUuid;
 use Carbon\Carbon;
 use Database\Factories\DrawFactory;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
@@ -11,6 +12,7 @@
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 
 /**
+ * @property string $uuid
  * @property Bucket $bucket
  * @property int $priority_order
  * @property float $amount
@@ -27,6 +29,7 @@ class Draw extends Model
     /** @use HasFactory<DrawFactory> */
     use HasFactory;
     use HasProjectionStatus;
+    use HasUuid;
 
     protected $fillable = [
         'bucket_id',
diff --git a/app/Models/Inflow.php b/app/Models/Inflow.php
index 821f0c9..6f77e88 100644
--- a/app/Models/Inflow.php
+++ b/app/Models/Inflow.php
@@ -4,12 +4,14 @@
 
 use App\Models\Traits\HasAmount;
 use App\Models\Traits\HasProjectionStatus;
+use App\Models\Traits\HasUuid;
 use Carbon\Carbon;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 
 /**
  * @property int $id
+ * @property string $uuid
  * @property int $stream_id
  * @property Stream $stream
  * @property float $amount
@@ -21,6 +23,7 @@ class Inflow extends Model
 {
     use HasAmount;
     use HasProjectionStatus;
+    use HasUuid;
 
     protected $fillable = [
         'stream_id',
diff --git a/app/Models/Outflow.php b/app/Models/Outflow.php
index 40b883c..c6def8f 100644
--- a/app/Models/Outflow.php
+++ b/app/Models/Outflow.php
@@ -4,6 +4,7 @@
 
 use App\Models\Traits\HasAmount;
 use App\Models\Traits\HasProjectionStatus;
+use App\Models\Traits\HasUuid;
 use Carbon\Carbon;
 use Database\Factories\OutflowFactory;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
@@ -12,6 +13,7 @@
 
 /**
  * @property int $id
+ * @property string $uuid
  * @property int $stream_id
  * @property Stream $stream
  * @property int $amount
@@ -28,6 +30,7 @@ class Outflow extends Model
     /** @use HasFactory<OutflowFactory> */
     use HasFactory;
     use HasProjectionStatus;
+    use HasUuid;
 
     protected $fillable = [
         'stream_id',
diff --git a/app/Models/Scenario.php b/app/Models/Scenario.php
index ae59193..e40ba3f 100644
--- a/app/Models/Scenario.php
+++ b/app/Models/Scenario.php
@@ -2,6 +2,7 @@
 
 namespace App\Models;
 
+use App\Models\Traits\HasUuid;
 use Database\Factories\ScenarioFactory;
 use Illuminate\Database\Eloquent\Collection;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
@@ -10,6 +11,7 @@
 
 /**
  * @property int $id
+ * @property string $uuid
  * @property Collection<Bucket> $buckets
  *
  * @method static create(array $data)
@@ -17,7 +19,7 @@
 class Scenario extends Model
 {
     /** @use HasFactory<ScenarioFactory> */
-    use HasFactory;
+    use HasFactory, HasUuid;
 
     protected $fillable = [
         'name',
diff --git a/app/Models/Stream.php b/app/Models/Stream.php
index 4d8fab0..0a4a954 100644
--- a/app/Models/Stream.php
+++ b/app/Models/Stream.php
@@ -5,6 +5,7 @@
 use App\Enums\StreamFrequencyEnum;
 use App\Enums\StreamTypeEnum;
 use App\Models\Traits\HasAmount;
+use App\Models\Traits\HasUuid;
 use Carbon\Carbon;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
@@ -12,12 +13,13 @@
 
 /**
  * @property int $amount
+ * @property string $uuid
  * @property StreamFrequencyEnum $frequency
  * @property Carbon $start_date
  */
 class Stream extends Model
 {
-    use HasAmount, HasFactory;
+    use HasAmount, HasFactory, HasUuid;
 
     protected $fillable = [
         'scenario_id',
diff --git a/app/Models/Traits/HasUuid.php b/app/Models/Traits/HasUuid.php
new file mode 100644
index 0000000..b427ce8
--- /dev/null
+++ b/app/Models/Traits/HasUuid.php
@@ -0,0 +1,22 @@
+<?php
+
+namespace App\Models\Traits;
+
+use Illuminate\Support\Str;
+
+trait HasUuid
+{
+    public static function bootHasUuid(): void
+    {
+        static::creating(function ($model) {
+            if (empty($model->uuid)) {
+                $model->uuid = (string) Str::orderedUuid();
+            }
+        });
+    }
+
+    public function getRouteKeyName(): string
+    {
+        return 'uuid';
+    }
+}
diff --git a/database/migrations/2025_12_29_192203_create_scenarios_table.php b/database/migrations/2025_12_29_192203_create_scenarios_table.php
index 2f1fdbe..f535fdf 100644
--- a/database/migrations/2025_12_29_192203_create_scenarios_table.php
+++ b/database/migrations/2025_12_29_192203_create_scenarios_table.php
@@ -10,6 +10,7 @@ public function up(): void
     {
         Schema::create('scenarios', function (Blueprint $table) {
             $table->id();
+            $table->uuid('uuid')->unique();
             $table->string('name');
             $table->text('description')->nullable();
             $table->timestamps();
diff --git a/database/migrations/2025_12_29_205724_create_buckets_table.php b/database/migrations/2025_12_29_205724_create_buckets_table.php
index b1dd390..159c7f5 100644
--- a/database/migrations/2025_12_29_205724_create_buckets_table.php
+++ b/database/migrations/2025_12_29_205724_create_buckets_table.php
@@ -10,6 +10,7 @@ public function up(): void
     {
         Schema::create('buckets', function (Blueprint $table) {
             $table->id();
+            $table->uuid('uuid')->unique();
             $table->foreignId('scenario_id')->constrained()->onDelete('cascade');
             $table->string('name');
             $table->integer('priority')->comment('Lower number = higher priority, 1 = first');
diff --git a/database/migrations/2025_12_30_202750_create_streams_table.php b/database/migrations/2025_12_30_202750_create_streams_table.php
index 95e8afc..dd3e185 100644
--- a/database/migrations/2025_12_30_202750_create_streams_table.php
+++ b/database/migrations/2025_12_30_202750_create_streams_table.php
@@ -12,6 +12,7 @@ public function up(): void
     {
         Schema::create('streams', function (Blueprint $table) {
             $table->id();
+            $table->uuid('uuid')->unique();
             $table->foreignId('scenario_id')->constrained()->cascadeOnDelete();
             $table->foreignId('bucket_id')->nullable()->constrained()->nullOnDelete();
             $table->string('name');
diff --git a/database/migrations/2025_12_30_234435_create_inflows_table.php b/database/migrations/2025_12_30_234435_create_inflows_table.php
index 1a55692..e4e25b2 100644
--- a/database/migrations/2025_12_30_234435_create_inflows_table.php
+++ b/database/migrations/2025_12_30_234435_create_inflows_table.php
@@ -10,6 +10,7 @@ public function up(): void
     {
         Schema::create('inflows', function (Blueprint $table) {
             $table->id();
+            $table->uuid('uuid')->unique();
             $table->foreignId('stream_id')->nullable()->constrained()->onDelete('set null');
             $table->unsignedBigInteger('amount');
             $table->date('date');
diff --git a/database/migrations/2025_12_30_234514_create_outflows_table.php b/database/migrations/2025_12_30_234514_create_outflows_table.php
index f9757b6..87dd217 100644
--- a/database/migrations/2025_12_30_234514_create_outflows_table.php
+++ b/database/migrations/2025_12_30_234514_create_outflows_table.php
@@ -10,6 +10,7 @@ public function up(): void
     {
         Schema::create('outflows', function (Blueprint $table) {
             $table->id();
+            $table->uuid('uuid')->unique();
             $table->foreignId('stream_id')->nullable()->constrained()->onDelete('set null');
             $table->foreignId('bucket_id')->nullable()->constrained()->onDelete('set null');
             $table->unsignedBigInteger('amount');
diff --git a/database/migrations/2025_12_30_234548_create_draws_table.php b/database/migrations/2025_12_30_234548_create_draws_table.php
index 5835f47..0a44ed2 100644
--- a/database/migrations/2025_12_30_234548_create_draws_table.php
+++ b/database/migrations/2025_12_30_234548_create_draws_table.php
@@ -10,6 +10,7 @@ public function up(): void
     {
         Schema::create('draws', function (Blueprint $table) {
             $table->id();
+            $table->uuid('uuid')->unique();
             $table->foreignId('bucket_id')->constrained()->onDelete('cascade');
             $table->unsignedBigInteger('amount');
             $table->date('date');
diff --git a/tests/Unit/Traits/HasUuidTest.php b/tests/Unit/Traits/HasUuidTest.php
new file mode 100644
index 0000000..24e9f04
--- /dev/null
+++ b/tests/Unit/Traits/HasUuidTest.php
@@ -0,0 +1,59 @@
+<?php
+
+namespace Tests\Unit\Traits;
+
+use App\Models\Bucket;
+use App\Models\Scenario;
+use App\Models\Stream;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Str;
+use Tests\TestCase;
+
+class HasUuidTest extends TestCase
+{
+    use RefreshDatabase;
+
+    public function test_uuid_is_auto_generated_on_creation(): void
+    {
+        $scenario = Scenario::factory()->create();
+
+        $this->assertNotNull($scenario->uuid);
+        $this->assertTrue(Str::isUuid($scenario->uuid));
+    }
+
+    public function test_uuid_is_not_overwritten_when_provided(): void
+    {
+        $customUuid = (string) Str::uuid();
+
+        $scenario = Scenario::factory()->create(['uuid' => $customUuid]);
+
+        $this->assertEquals($customUuid, $scenario->uuid);
+    }
+
+    public function test_route_key_name_returns_uuid(): void
+    {
+        $scenario = Scenario::factory()->create();
+
+        $this->assertEquals('uuid', $scenario->getRouteKeyName());
+    }
+
+    public function test_each_model_gets_a_unique_uuid(): void
+    {
+        $a = Scenario::factory()->create();
+        $b = Scenario::factory()->create();
+
+        $this->assertNotEquals($a->uuid, $b->uuid);
+    }
+
+    public function test_all_uuid_models_have_correct_route_key_name(): void
+    {
+        $scenario = Scenario::factory()->create();
+        $bucket = Bucket::factory()->create(['scenario_id' => $scenario->id]);
+        $stream = Stream::factory()->create(['scenario_id' => $scenario->id]);
+
+        $this->assertEquals('uuid', $bucket->getRouteKeyName());
+        $this->assertEquals('uuid', $stream->getRouteKeyName());
+        $this->assertTrue(Str::isUuid($bucket->uuid));
+        $this->assertTrue(Str::isUuid($stream->uuid));
+    }
+}