complete story 4.3 adfter validation and fixing

app/Models/Timeline.php

@@ -41,4 +41,52 @@ class Timeline extends Model
     {
         return $this->hasMany(TimelineUpdate::class)->orderBy('created_at', 'asc');
     }
+
+    /**
+     * Archive the timeline.
+     */
+    public function archive(): void
+    {
+        $this->update(['status' => TimelineStatus::Archived]);
+    }
+
+    /**
+     * Unarchive the timeline.
+     */
+    public function unarchive(): void
+    {
+        $this->update(['status' => TimelineStatus::Active]);
+    }
+
+    /**
+     * Check if the timeline is archived.
+     */
+    public function isArchived(): bool
+    {
+        return $this->status === TimelineStatus::Archived;
+    }
+
+    /**
+     * Check if the timeline is active.
+     */
+    public function isActive(): bool
+    {
+        return $this->status === TimelineStatus::Active;
+    }
+
+    /**
+     * Scope a query to only include active timelines.
+     */
+    public function scopeActive($query)
+    {
+        return $query->where('status', TimelineStatus::Active);
+    }
+
+    /**
+     * Scope a query to only include archived timelines.
+     */
+    public function scopeArchived($query)
+    {
+        return $query->where('status', TimelineStatus::Archived);
+    }
 }