Add VaultNode model, migration and relationships

app/Models/Vault.php

@@ -5,6 +5,7 @@ namespace App\Models;
 use App\Models\User;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\SoftDeletes;
+use Illuminate\Database\Eloquent\Relations\HasMany;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 
@@ -29,4 +30,12 @@ class Vault extends Model
     {
         return $this->belongsTo(User::class, 'created_by');
     }
+
+    /**
+     * Get the nodes for the vault.
+     */
+    public function nodes(): HasMany
+    {
+        return $this->hasMany(VaultNode::class);
+    }
 }