diff --git a/app/Models/Booking.php b/app/Models/Booking.php
index 79a91ba..f3bf11c 100644
--- a/app/Models/Booking.php
+++ b/app/Models/Booking.php
@@ -9,6 +9,7 @@ namespace App\Models;
 use Carbon\Carbon;
 use App\Services\Util;
 use App\Services\Passolution;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Collection;
 
@@ -18,7 +19,7 @@ use Illuminate\Database\Eloquent\Collection;
  * @property int $id
  * @property Carbon $booking_date
  * @property int $customer_id
- * @property int $lead_id
+ * @property int $inquiry_id
  * @property bool $new_drafts
  * @property int $sf_guard_user_id
  * @property int $branch_id
@@ -203,13 +204,16 @@ use Illuminate\Database\Eloquent\Collection;
  */
 class Booking extends Model
 {
+    use HasFactory;
+
     protected $connection = 'mysql';
 
     protected $table = 'booking';
 
     protected $casts = [
         'customer_id' => 'int',
-        'lead_id' => 'int',
+        'inquiry_id' => 'int',
+        'offer_id' => 'int',
         'new_drafts' => 'bool',
         'sf_guard_user_id' => 'int',
         'branch_id' => 'int',
@@ -237,25 +241,24 @@ class Booking extends Model
         'is_rail_fly' => 'bool',
         'comfort' => 'bool',
         'airline_ids' => 'array',
-        'participant_pass' => 'bool'
-    ];
-
-    protected $dates = [
-        'booking_date',
-        'start_date',
-        'end_date',
-        'participant_birthdate',
-        'final_payment_date',
-        'refund_date',
-        'lawyer_date',
-        'xx_tkt_date'
-
-    ];
+        'participant_pass' => 'bool',
+		'booking_date' => 'datetime',
+		'start_date' => 'datetime',
+		'end_date' => 'datetime',
+		'participant_birthdate' => 'datetime',
+		'final_payment_date' => 'datetime',
+		'refund_date' => 'datetime',
+		'lawyer_date' => 'datetime',
+		'xx_tkt_date' => 'datetime',
+	];
+
+    
 
     protected $fillable = [
         'booking_date',
         'customer_id',
-        'lead_id',
+        'inquiry_id',
+        'offer_id',
         'new_drafts',
         'sf_guard_user_id',
         'branch_id',
@@ -392,9 +395,29 @@ class Booking extends Model
         return $this->belongsTo(Customer::class);
     }
 
+    /**
+     * Lead/Inquiry der Buchung.
+     * FK-Spalte `inquiry_id` (vormals `lead_id` — Modul 3 Phase 2 Rename).
+     * Methodenname bleibt `lead()` für Legacy-Kompatibilität; {@see self::inquiry()}
+     * ist der fachlich korrekte Alias und sollte in neuem Code verwendet werden.
+     */
     public function lead()
     {
-        return $this->belongsTo(Lead::class);
+        return $this->belongsTo(Lead::class, 'inquiry_id');
+    }
+
+    public function inquiry()
+    {
+        return $this->belongsTo(Lead::class, 'inquiry_id');
+    }
+
+    /**
+     * Angebot, aus dem diese Buchung entstanden ist (Modul 6, Ticket B8).
+     * Nullable — nicht jede Buchung hat einen Angebots-Vorlauf.
+     */
+    public function offer()
+    {
+        return $this->belongsTo(\App\Models\Offer::class);
     }
 
     public function sf_guard_user()