diff --git a/app/Domains/Analytics/Models/Click.php b/app/Domains/Analytics/Models/Click.php
new file mode 100644
index 0000000..4d16290
--- /dev/null
+++ b/app/Domains/Analytics/Models/Click.php
@@ -0,0 +1,30 @@
+<?php
+
+namespace App\Domains\Analytics\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class Click extends Model
+{
+    public $timestamps = false;
+
+    protected $guarded = [];
+
+    protected $casts = [
+        'clicked_at' => 'datetime',
+    ];
+
+    // Prevent updates — clicks are append-only
+    public function save(array $options = []): bool
+    {
+        if ($this->exists) {
+            throw new \LogicException('Click records are append-only.');
+        }
+        return parent::save($options);
+    }
+
+    public function link()
+    {
+        return $this->belongsTo(\App\Domains\Link\Models\Link::class);
+    }
+}
diff --git a/app/Domains/Domain/Models/Domain.php b/app/Domains/Domain/Models/Domain.php
new file mode 100644
index 0000000..bbdb84a
--- /dev/null
+++ b/app/Domains/Domain/Models/Domain.php
@@ -0,0 +1,28 @@
+<?php
+
+namespace App\Domains\Domain\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class Domain extends Model
+{
+    protected $guarded = ['id', 'workspace_id'];
+
+    protected $casts = [
+        'verified_at' => 'datetime',
+        'ssl_issued_at' => 'datetime',
+        'ssl_expires_at' => 'datetime',
+        'is_default' => 'boolean',
+    ];
+
+    public function workspace(): BelongsTo
+    {
+        return $this->belongsTo(\App\Domains\Workspace\Models\Workspace::class);
+    }
+
+    public function isVerified(): bool
+    {
+        return $this->verified_at !== null;
+    }
+}
diff --git a/app/Domains/Link/Models/Link.php b/app/Domains/Link/Models/Link.php
new file mode 100644
index 0000000..8d43237
--- /dev/null
+++ b/app/Domains/Link/Models/Link.php
@@ -0,0 +1,53 @@
+<?php
+
+namespace App\Domains\Link\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\SoftDeletes;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class Link extends Model
+{
+    use SoftDeletes;
+
+    protected $guarded = ['id', 'workspace_id', 'created_by'];
+
+    protected $casts = [
+        'rules' => 'array',
+        'pixel_config' => 'array',
+        'tags' => 'array',
+        'expires_at' => 'datetime',
+    ];
+
+    public function workspace(): BelongsTo
+    {
+        return $this->belongsTo(\App\Domains\Workspace\Models\Workspace::class);
+    }
+
+    public function domain(): BelongsTo
+    {
+        return $this->belongsTo(\App\Domains\Domain\Models\Domain::class);
+    }
+
+    public function variants(): HasMany
+    {
+        return $this->hasMany(LinkVariant::class);
+    }
+
+    public function clicks(): HasMany
+    {
+        return $this->hasMany(\App\Domains\Analytics\Models\Click::class);
+    }
+
+    public function isActive(): bool
+    {
+        if ($this->status !== 'active') {
+            return false;
+        }
+        if ($this->expires_at && $this->expires_at->isPast()) {
+            return false;
+        }
+        return true;
+    }
+}
diff --git a/app/Domains/Link/Models/LinkVariant.php b/app/Domains/Link/Models/LinkVariant.php
new file mode 100644
index 0000000..867dd4f
--- /dev/null
+++ b/app/Domains/Link/Models/LinkVariant.php
@@ -0,0 +1,16 @@
+<?php
+
+namespace App\Domains\Link\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class LinkVariant extends Model
+{
+    protected $guarded = ['id'];
+
+    public function link(): BelongsTo
+    {
+        return $this->belongsTo(Link::class);
+    }
+}
diff --git a/app/Domains/Subscription/Models/Plan.php b/app/Domains/Subscription/Models/Plan.php
new file mode 100644
index 0000000..57feb37
--- /dev/null
+++ b/app/Domains/Subscription/Models/Plan.php
@@ -0,0 +1,20 @@
+<?php
+
+namespace App\Domains\Subscription\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+
+class Plan extends Model
+{
+    protected $guarded = ['id'];
+
+    protected $casts = [
+        'features' => 'array',
+    ];
+
+    public function workspaces(): HasMany
+    {
+        return $this->hasMany(\App\Domains\Workspace\Models\Workspace::class);
+    }
+}
diff --git a/app/Domains/Workspace/Models/Workspace.php b/app/Domains/Workspace/Models/Workspace.php
new file mode 100644
index 0000000..1d6c0aa
--- /dev/null
+++ b/app/Domains/Workspace/Models/Workspace.php
@@ -0,0 +1,51 @@
+<?php
+
+namespace App\Domains\Workspace\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\SoftDeletes;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class Workspace extends Model
+{
+    use SoftDeletes;
+
+    protected $guarded = ['id', 'owner_id'];
+
+    protected $casts = [
+        'branding' => 'array',
+        'stripe_customer_metadata' => 'array',
+        'trial_ends_at' => 'datetime',
+    ];
+
+    public function owner(): BelongsTo
+    {
+        return $this->belongsTo(\App\Models\User::class, 'owner_id');
+    }
+
+    public function members(): HasMany
+    {
+        return $this->hasMany(WorkspaceMember::class);
+    }
+
+    public function invitations(): HasMany
+    {
+        return $this->hasMany(WorkspaceInvitation::class);
+    }
+
+    public function links(): HasMany
+    {
+        return $this->hasMany(\App\Domains\Link\Models\Link::class);
+    }
+
+    public function domains(): HasMany
+    {
+        return $this->hasMany(\App\Domains\Domain\Models\Domain::class);
+    }
+
+    public function plan(): BelongsTo
+    {
+        return $this->belongsTo(\App\Domains\Subscription\Models\Plan::class);
+    }
+}
diff --git a/app/Domains/Workspace/Models/WorkspaceInvitation.php b/app/Domains/Workspace/Models/WorkspaceInvitation.php
new file mode 100644
index 0000000..872e0a6
--- /dev/null
+++ b/app/Domains/Workspace/Models/WorkspaceInvitation.php
@@ -0,0 +1,36 @@
+<?php
+
+namespace App\Domains\Workspace\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class WorkspaceInvitation extends Model
+{
+    protected $guarded = ['id'];
+
+    protected $casts = [
+        'expires_at' => 'datetime',
+        'accepted_at' => 'datetime',
+    ];
+
+    public function workspace(): BelongsTo
+    {
+        return $this->belongsTo(Workspace::class);
+    }
+
+    public function invitedBy(): BelongsTo
+    {
+        return $this->belongsTo(\App\Models\User::class, 'invited_by');
+    }
+
+    public function isExpired(): bool
+    {
+        return $this->expires_at->isPast();
+    }
+
+    public function isAccepted(): bool
+    {
+        return $this->accepted_at !== null;
+    }
+}
diff --git a/app/Domains/Workspace/Models/WorkspaceMember.php b/app/Domains/Workspace/Models/WorkspaceMember.php
new file mode 100644
index 0000000..7bf77d7
--- /dev/null
+++ b/app/Domains/Workspace/Models/WorkspaceMember.php
@@ -0,0 +1,25 @@
+<?php
+
+namespace App\Domains\Workspace\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class WorkspaceMember extends Model
+{
+    protected $guarded = ['id'];
+
+    protected $casts = [
+        'joined_at' => 'datetime',
+    ];
+
+    public function workspace(): BelongsTo
+    {
+        return $this->belongsTo(Workspace::class);
+    }
+
+    public function user(): BelongsTo
+    {
+        return $this->belongsTo(\App\Models\User::class);
+    }
+}
diff --git a/app/Models/User.php b/app/Models/User.php
index 68f3a66..04f3efa 100644
--- a/app/Models/User.php
+++ b/app/Models/User.php
@@ -5,24 +5,25 @@ namespace App\Models;
 // use Illuminate\Contracts\Auth\MustVerifyEmail;
 use Database\Factories\UserFactory;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\SoftDeletes;
 use Illuminate\Foundation\Auth\User as Authenticatable;
 use Illuminate\Notifications\Notifiable;
 
 class User extends Authenticatable
 {
     /** @use HasFactory<UserFactory> */
-    use HasFactory, Notifiable;
+    use HasFactory, Notifiable, SoftDeletes;
 
-    /**
-     * The attributes that are mass assignable.
-     *
-     * @var list<string>
-     */
-    protected $fillable = [
-        'name',
-        'email',
-        'password',
-    ];
+    protected $guarded = ['id'];
+
+    protected static function booted(): void
+    {
+        static::creating(function (self $user) {
+            if (empty($user->ulid)) {
+                $user->ulid = \Illuminate\Support\Str::ulid();
+            }
+        });
+    }
 
     /**
      * The attributes that should be hidden for serialization.
@@ -43,7 +44,23 @@ class User extends Authenticatable
     {
         return [
             'email_verified_at' => 'datetime',
+            'two_factor_confirmed_at' => 'datetime',
             'password' => 'hashed',
         ];
     }
+
+    public function workspaces()
+    {
+        return $this->hasMany(\App\Domains\Workspace\Models\Workspace::class, 'owner_id');
+    }
+
+    public function defaultWorkspace()
+    {
+        return $this->belongsTo(\App\Domains\Workspace\Models\Workspace::class, 'default_workspace_id');
+    }
+
+    public function workspaceMemberships()
+    {
+        return $this->hasMany(\App\Domains\Workspace\Models\WorkspaceMember::class);
+    }
 }
diff --git a/tests/Feature/ProfileTest.php b/tests/Feature/ProfileTest.php
index 984f050..481ce23 100644
--- a/tests/Feature/ProfileTest.php
+++ b/tests/Feature/ProfileTest.php
@@ -69,7 +69,7 @@ test('user can delete their account', function () {
         ->assertRedirect('/');
 
     $this->assertGuest();
-    $this->assertNull($user->fresh());
+    $this->assertNotNull($user->fresh()->deleted_at);
 });
 
 test('correct password must be provided to delete account', function () {