diff --git a/app/Models/Hold.php b/app/Models/Hold.php
new file mode 100644
index 0000000..5a5364e
--- /dev/null
+++ b/app/Models/Hold.php
@@ -0,0 +1,46 @@
+<?php
+
+namespace App\Models;
+
+use App\Enums\HoldStatus;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Support\Carbon;
+
+/**
+ * @property HoldStatus $status
+ * @property Carbon $expires_at
+ */
+class Hold extends Model
+{
+    protected $fillable = [
+        'slot_id',
+        'idempotency_key',
+        'status',
+        'expires_at',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+           'status' => HoldStatus::class,
+           'expires_at' => 'datetime',
+        ];
+    }
+
+    /** @return BelongsTo<Slot, $this> */
+    public function slot(): BelongsTo
+    {
+        return $this->belongsTo(Slot::class);
+    }
+
+    public function isExpired(): bool
+    {
+        return $this->expires_at->isPast();
+    }
+
+    public function isActiveHold(): bool
+    {
+        return $this->status === HoldStatus::Held && ! $this->isExpired();
+    }
+}
diff --git a/app/Models/Slot.php b/app/Models/Slot.php
new file mode 100644
index 0000000..6e71d0c
--- /dev/null
+++ b/app/Models/Slot.php
@@ -0,0 +1,28 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+
+class Slot extends Model
+{
+    protected $fillable = [
+        'capacity',
+        'remaining',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'capacity' => 'integer',
+            'remaining' => 'integer',
+        ];
+    }
+
+    /** @return HasMany<Hold, $this> */
+    public function holds(): HasMany
+    {
+        return $this->hasMany(Hold::class);
+    }
+}