feat(webhook): persist incoming provider messages

internal/handler/webhook/tiktok_webhook.go

@@ -25,6 +25,7 @@ type TikTokWebhookHandler struct {
 	tiktokWebhook *tiktokchannel.WebhookHandler
 	pipeline      *tiktokchannel.IncomingProcessor
 	db            *gorm.DB
+	persister     *IncomingPersister
 }
 
 // NewTikTokWebhookHandler creates a Gin-compatible TikTok webhook handler.
@@ -33,6 +34,7 @@ func NewTikTokWebhookHandler(tiktokWebhook *tiktokchannel.WebhookHandler, pipeli
 		tiktokWebhook: tiktokWebhook,
 		pipeline:      pipeline,
 		db:            db,
+		persister:     NewIncomingPersister(db),
 	}
 }
 
@@ -74,11 +76,17 @@ func (h *TikTokWebhookHandler) HandleTikTokWebhook(c *gin.Context) {
 	}
 
 	// Process the event via the pipeline
-	if err := h.pipeline.ProcessUpdate(c.Request.Context(), inbox, *event); err != nil {
+	incomingMsg, err := h.pipeline.ProcessUpdate(c.Request.Context(), inbox, *event)
+	if err != nil {
 		applogger.L().Errorf("TikTok webhook: process event failed for inbox %d: %v", inbox.ID, err)
 		c.JSON(http.StatusOK, gin.H{"status": "ignored"})
 		return
 	}
+	if incomingMsg != nil {
+		if _, persistErr := h.persister.PersistIncoming(c.Request.Context(), inbox, incomingMsg); persistErr != nil {
+			applogger.L().Errorf("TikTok webhook: persist event failed for inbox %d source_id=%s: %v", inbox.ID, incomingMsg.SourceID, persistErr)
+		}
+	}
 
 	c.JSON(http.StatusOK, gin.H{"status": "processed"})
 }