feat(webhook): persist incoming provider messages

internal/handler/webhook/line_webhook.go

@@ -27,6 +27,7 @@ type LineWebhookHandler struct {
 	pipeline    *linechannel.IncomingProcessor
 	service     *linechannel.LineService
 	db          *gorm.DB
+	persister   *IncomingPersister
 }
 
 // NewLineWebhookHandler creates a LINE webhook handler for Gin integration.
@@ -36,6 +37,7 @@ func NewLineWebhookHandler(lineWebhook *linechannel.WebhookHandler, pipeline *li
 		pipeline:    pipeline,
 		service:     service,
 		db:          db,
+		persister:   NewIncomingPersister(db),
 	}
 }
 
@@ -100,8 +102,11 @@ func (h *LineWebhookHandler) HandleLineWebhook(c *gin.Context) {
 			continue
 		}
 		if incomingMsg != nil {
-			applogger.L().Debugf("LINE webhook: processed event type=%s sender=%s",
-				event.Type, incomingMsg.SenderID)
+			if _, persistErr := h.persister.PersistIncoming(c.Request.Context(), inbox, incomingMsg); persistErr != nil {
+				applogger.L().Errorf("LINE webhook: persist event failed for inbox %d source_id=%s: %v", inbox.ID, incomingMsg.SourceID, persistErr)
+				continue
+			}
+			applogger.L().Debugf("LINE webhook: persisted event type=%s sender=%s", event.Type, incomingMsg.SenderID)
 		}
 	}