fix: correct UUID format string issues in logging and tests

- Fix scheduler.go log.Printf calls to convert pgtype.UUID to string before formatting
- Fix ebook.go fmt.Printf calls to convert pgtype.UUID to string before formatting
- Add missing Enabled field to rate limiter config in security test
- Prevents format string errors when logging library IDs

This resolves compilation errors where pgtype.UUID was being formatted
with %s which expects a string, not a UUID struct.

cmd/server/tests/security_test.go

@@ -87,6 +87,7 @@ func TestRateLimiterSecurity(t *testing.T) {
 	e := echo.New()
 
 	config := ratelimit.RateLimiterConfig{
+		Enabled:           true,
 		RequestsPerMinute: 3,
 		CleanupInterval:   1 * time.Minute,
 	}

internal/handlers/ebook.go

@@ -797,11 +797,12 @@ func (h *Handler) StartWatchModeForAllLibraries(ctx context.Context) error {
 	}
 
 	for _, library := range libraries {
+		libraryIDStr := fmt.Sprintf("%x", library.ID.Bytes)
 		if err := h.StartWatchModeForLibrary(ctx, library.ID, library.ID); err != nil {
-			fmt.Printf("Warning: failed to start watch mode for library %s: %v\n", library.ID, err)
+			fmt.Printf("Warning: failed to start watch mode for library %s: %v\n", libraryIDStr, err)
 			continue
 		}
-		fmt.Printf("Started watch mode for library %s (%s)\n", library.Name, library.ID)
+		fmt.Printf("Started watch mode for library %s (%s)\n", library.Name, libraryIDStr)
 	}
 
 	return nil

internal/services/scheduler.go

@@ -109,7 +109,8 @@ func (s *Scheduler) checkAndScheduleScans() {
 	for _, library := range libraries {
 		settings, err := s.db.GetScanSettings(ctx, library.ID)
 		if err != nil {
-			log.Printf("Error getting scan settings for library %s: %v", library.ID, err)
+			libraryIDStr := fmt.Sprintf("%x", library.ID.Bytes)
+			log.Printf("Error getting scan settings for library %s: %v", libraryIDStr, err)
 			continue
 		}
 
@@ -156,20 +157,22 @@ func (s *Scheduler) scheduleLibraryScan(ctx context.Context, libraryID pgtype.UU
 
 	s.timers[timerID] = timer
 
-	log.Printf("Scheduled scan for library %s every %d minutes", libraryID, frequencyMinutes)
+	libraryIDStr := fmt.Sprintf("%x", libraryID.Bytes)
+	log.Printf("Scheduled scan for library %s every %d minutes", libraryIDStr, frequencyMinutes)
 }
 
 func (s *Scheduler) triggerScheduledScan(ctx context.Context, libraryID pgtype.UUID, userID string) {
-	log.Printf("Triggering scheduled scan for library %s", libraryID)
+	libraryIDStr := fmt.Sprintf("%x", libraryID.Bytes)
+	log.Printf("Triggering scheduled scan for library %s", libraryIDStr)
 
 	folders, err := s.db.GetLibraryFolders(ctx, libraryID)
 	if err != nil {
-		log.Printf("Error getting folders for library %s: %v", libraryID, err)
+		log.Printf("Error getting folders for library %s: %v", libraryIDStr, err)
 		return
 	}
 
 	if len(folders) == 0 {
-		log.Printf("No folders configured for library %s, skipping scan", libraryID)
+		log.Printf("No folders configured for library %s, skipping scan", libraryIDStr)
 		return
 	}
 
@@ -194,7 +197,8 @@ func (s *Scheduler) triggerScheduledScan(ctx context.Context, libraryID pgtype.U
 	if err := s.worker.EnqueueJob(job); err != nil {
 		log.Printf("Error enqueuing scan job: %v", err)
 	} else {
-		log.Printf("Enqueued scan job %s for library %s", job.ID, libraryID)
+		libraryIDStr := fmt.Sprintf("%x", libraryID.Bytes)
+		log.Printf("Enqueued scan job %s for library %s", job.ID, libraryIDStr)
 	}
 }