Implement package limit notification system

app/Models/TenantPackage.php

@@ -30,6 +30,11 @@ class TenantPackage extends Model
         'expires_at' => 'datetime',
         'used_events' => 'integer',
         'active' => 'boolean',
+        'event_warning_sent_at' => 'datetime',
+        'event_warning_threshold' => 'float',
+        'event_limit_notified_at' => 'datetime',
+        'expiry_warning_sent_at' => 'datetime',
+        'expired_notified_at' => 'datetime',
     ];
 
     public function tenant(): BelongsTo