Add Campaigns module for grouping QR codes.

Let accounts organise codes by promo or launch, attach or detach codes, and view combined scan totals from the sidebar.

app/Models/QrCode.php

@@ -30,6 +30,7 @@ class QrCode extends Model
 
     protected $fillable = [
         'user_id',
+        'campaign_id',
         'short_code',
         'type',
         'label',
@@ -59,6 +60,11 @@ class QrCode extends Model
         return $this->belongsTo(User::class);
     }
 
+    public function campaign(): BelongsTo
+    {
+        return $this->belongsTo(Campaign::class);
+    }
+
     public function document(): BelongsTo
     {
         return $this->belongsTo(QrDocument::class, 'qr_document_id');