diff --git a/docs/FEATURE_STATUS.md b/docs/FEATURE_STATUS.md
index 93761d26e..76e4f39bf 100644
--- a/docs/FEATURE_STATUS.md
+++ b/docs/FEATURE_STATUS.md
@@ -34,7 +34,7 @@ Ce document décrit le statut réel des fonctionnalités par rapport au code.
 |---------|-------------|--------|
 | **Studio** (Cloud File Browser) | Supprimé | Dossier supprimé |
 | **Education** | Supprimé | Dossier supprimé |
-| **Gamification** (achievements, leaderboard) | MSW handlers | api_manager (build ignore), MSW uniquement |
+| **Gamification** (achievements, leaderboard) | MSW handlers | api_manager archivé (internal/api/archive/), MSW uniquement |
 
 ## Fonctionnalités désactivées (feature flags)
 
diff --git a/veza-backend-api/docs/TODOS_AUDIT.md b/veza-backend-api/docs/TODOS_AUDIT.md
index c1952e92b..e0ba8b7aa 100644
--- a/veza-backend-api/docs/TODOS_AUDIT.md
+++ b/veza-backend-api/docs/TODOS_AUDIT.md
@@ -100,10 +100,10 @@ This document lists all TODO, FIXME, HACK, and XXX comments found in the codebas
   - **Status**: Open
   - **Category**: Migration incomplete
 
-### `internal/api/api_manager.go`
+### `internal/api/archive/api_manager.go` (archived, build-ignored)
 - **TODO**: Réactiver api_manager.go après stabilisation du noyau et alignement des services (graphql, grpc, websocket, features)
   - **Priority**: P3
-  - **Status**: Deferred
+  - **Status**: Deferred (fichier archivé)
   - **Category**: Future feature
 - **TODO**: Implement feature start
   - **Priority**: P3
diff --git a/veza-backend-api/internal/api/archive/README.md b/veza-backend-api/internal/api/archive/README.md
new file mode 100644
index 000000000..04da9f630
--- /dev/null
+++ b/veza-backend-api/internal/api/archive/README.md
@@ -0,0 +1,10 @@
+# Archived API modules
+
+This directory contains deprecated or build-ignored API code.
+
+## api_manager.go
+
+- **Status**: Excluded from build (`//go:build ignore`)
+- **Reason**: GraphQL, gRPC, WebSocket, and gamification (achievements, leaderboard) handlers were never fully integrated with the core REST router
+- **Content**: handleGetAchievements, handleGetLeaderboard, multi-protocol setup
+- **Reference**: docs/TODOS_AUDIT.md, docs/FEATURE_STATUS.md (Gamification: fantôme)
diff --git a/veza-backend-api/internal/api/api_manager.go b/veza-backend-api/internal/api/archive/api_manager.go
similarity index 100%
rename from veza-backend-api/internal/api/api_manager.go
rename to veza-backend-api/internal/api/archive/api_manager.go
diff --git a/veza-backend-api/internal/core/track/handler.go b/veza-backend-api/internal/core/track/handler.go
index b4dd2a7c0..1fe08d36b 100644
--- a/veza-backend-api/internal/core/track/handler.go
+++ b/veza-backend-api/internal/core/track/handler.go
@@ -1287,7 +1287,7 @@ func (h *TrackHandler) UnlikeTrack(c *gin.Context) {
 		return
 	}
 
-	c.JSON(http.StatusOK, gin.H{"message": "track unliked"})
+	handlers.RespondSuccess(c, http.StatusOK, gin.H{"message": "track unliked"})
 }
 
 // GetTrackLikes gère la récupération du nombre de likes d'un track
@@ -1323,7 +1323,7 @@ func (h *TrackHandler) GetTrackLikes(c *gin.Context) {
 		}
 	}
 
-	c.JSON(http.StatusOK, gin.H{
+	handlers.RespondSuccess(c, http.StatusOK, gin.H{
 		"count":    count,
 		"is_liked": isLiked,
 	})
@@ -1663,12 +1663,12 @@ func (h *TrackHandler) CreateShare(c *gin.Context) {
 
 	share, err := h.shareService.CreateShare(c.Request.Context(), trackID, userID, req.Permissions, req.ExpiresAt)
 	if err != nil {
-		if errors.Is(err, ErrForbidden) {
+		if errors.Is(err, services.ErrForbidden) {
 			// MOD-P2-003: Utiliser AppError au lieu de gin.H
 			h.respondWithError(c, http.StatusForbidden, "forbidden")
 			return
 		}
-		if errors.Is(err, ErrTrackNotFound) {
+		if errors.Is(err, services.ErrTrackNotFound) {
 			// MOD-P2-003: Utiliser AppError au lieu de gin.H
 			h.respondWithError(c, http.StatusNotFound, "track not found")
 			return
@@ -1678,7 +1678,7 @@ func (h *TrackHandler) CreateShare(c *gin.Context) {
 		return
 	}
 
-	c.JSON(http.StatusOK, gin.H{"share": share})
+	handlers.RespondSuccess(c, http.StatusOK, gin.H{"share": share})
 }
 
 // GetSharedTrack récupère un track via son token de partage
@@ -1992,6 +1992,10 @@ func (h *TrackHandler) RecordPlay(c *gin.Context) {
 	// Enregistrer l'événement via le service
 	err = h.playbackAnalyticsService.RecordPlayback(c.Request.Context(), analytics)
 	if err != nil {
+		if errors.Is(err, services.ErrTrackNotFound) {
+			h.respondWithError(c, http.StatusNotFound, "track not found")
+			return
+		}
 		h.respondWithError(c, http.StatusInternalServerError, "failed to record play event")
 		return
 	}
diff --git a/veza-backend-api/internal/core/track/handler_additional_test.go b/veza-backend-api/internal/core/track/handler_additional_test.go
index 585091b8c..55b501cb1 100644
--- a/veza-backend-api/internal/core/track/handler_additional_test.go
+++ b/veza-backend-api/internal/core/track/handler_additional_test.go
@@ -368,9 +368,12 @@ func TestTrackHandler_GetSharedTrack_Success(t *testing.T) {
 
 // TestTrackHandler_GetSharedTrack_InvalidToken tests GetSharedTrack with invalid token
 func TestTrackHandler_GetSharedTrack_InvalidToken(t *testing.T) {
-	handler, _, router, cleanup := setupTestTrackHandler(t)
+	handler, db, router, cleanup := setupTestTrackHandler(t)
 	defer cleanup()
 
+	shareService := services.NewTrackShareService(db)
+	handler.SetShareService(shareService)
+
 	router.GET("/tracks/shared/:token", handler.GetSharedTrack)
 
 	invalidToken := "invalid-token"
@@ -473,9 +476,9 @@ func TestTrackHandler_GetUserLikedTracks_Success(t *testing.T) {
 		c.Set("user_id", userID)
 		c.Next()
 	})
-	router.GET("/users/me/liked", handler.GetUserLikedTracks)
+	router.GET("/users/:id/likes", handler.GetUserLikedTracks)
 
-	req := httptest.NewRequest(http.MethodGet, "/users/me/liked?page=1&limit=10", nil)
+	req := httptest.NewRequest(http.MethodGet, fmt.Sprintf("/users/%s/likes?limit=10&offset=0", userID.String()), nil)
 	req.Header.Set("X-User-ID", userID.String())
 	w := httptest.NewRecorder()
 	router.ServeHTTP(w, req)
diff --git a/veza-backend-api/internal/core/track/handler_test.go b/veza-backend-api/internal/core/track/handler_test.go
index 013ca586a..df41e1eae 100644
--- a/veza-backend-api/internal/core/track/handler_test.go
+++ b/veza-backend-api/internal/core/track/handler_test.go
@@ -44,6 +44,7 @@ func setupTestTrackHandler(t *testing.T) (*TrackHandler, *gorm.DB, *gin.Engine,
 		&models.Permission{},
 		&models.UserRole{},
 		&models.RolePermission{},
+		&models.PlaybackAnalytics{},
 	)
 	require.NoError(t, err)
 
diff --git a/veza-backend-api/internal/services/job_service.go b/veza-backend-api/internal/services/job_service.go
index 5e4368f10..b19e46475 100644
--- a/veza-backend-api/internal/services/job_service.go
+++ b/veza-backend-api/internal/services/job_service.go
@@ -14,6 +14,7 @@ type JobEnqueuer interface {
 	EnqueueEmailJobWithTemplate(to, subject, templateName string, templateData map[string]interface{})
 	EnqueueThumbnailJob(inputPath, outputPath string, width, height int)
 	EnqueueAnalyticsJob(eventName string, userID *uuid.UUID, payload map[string]interface{})
+	EnqueueTranscodingJob(trackID uuid.UUID, inputPath, outputDir string)
 }
 
 // JobService gère les jobs en arrière-plan
@@ -29,6 +30,7 @@ const (
 	TypeThumbnailGenerate = "thumbnail:generate"
 	TypeAnalyticsProcess  = "analytics:process"
 	TypeWebhookDelivery   = "webhook:delivery"
+	TypeTranscoding       = "transcoding"
 )
 
 // EmailPayload représente les données pour l'envoi d'email
diff --git a/veza-backend-api/internal/services/job_service_test.go b/veza-backend-api/internal/services/job_service_test.go
index 6203af7fb..b5ba6e15d 100644
--- a/veza-backend-api/internal/services/job_service_test.go
+++ b/veza-backend-api/internal/services/job_service_test.go
@@ -27,6 +27,8 @@ func (m *MockJobEnqueuer) EnqueueThumbnailJob(inputPath, outputPath string, widt
 	m.Called(inputPath, outputPath, width, height)
 }
 
+func (m *MockJobEnqueuer) EnqueueTranscodingJob(trackID uuid.UUID, inputPath, outputDir string) {}
+
 func (m *MockJobEnqueuer) EnqueueAnalyticsJob(eventName string, userID *uuid.UUID, payload map[string]interface{}) {
 	m.Called(eventName, userID, payload)
 }
diff --git a/veza-backend-api/internal/services/playback_analytics_service.go b/veza-backend-api/internal/services/playback_analytics_service.go
index 02a549f6a..d5c1fb277 100644
--- a/veza-backend-api/internal/services/playback_analytics_service.go
+++ b/veza-backend-api/internal/services/playback_analytics_service.go
@@ -2,14 +2,15 @@ package services
 
 import (
 	"context"
+	"errors"
 	"fmt"
-	"github.com/google/uuid"
 	"time"
 
-	"veza-backend-api/internal/models"
-
+	"github.com/google/uuid"
 	"go.uber.org/zap"
 	"gorm.io/gorm"
+
+	"veza-backend-api/internal/models"
 )
 
 // PlaybackAnalyticsService gère les analytics de lecture de tracks
@@ -82,8 +83,8 @@ func (s *PlaybackAnalyticsService) RecordPlayback(ctx context.Context, analytics
 	// Vérifier que le track existe
 	var track models.Track
 	if err := s.db.WithContext(ctx).First(&track, analytics.TrackID).Error; err != nil {
-		if err == gorm.ErrRecordNotFound {
-			return fmt.Errorf("track not found: %s", analytics.TrackID)
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return ErrTrackNotFound
 		}
 		return fmt.Errorf("failed to get track: %w", err)
 	}
diff --git a/veza-backend-api/internal/workers/job_worker.go b/veza-backend-api/internal/workers/job_worker.go
index ccc3be7da..cdfaf2d0a 100644
--- a/veza-backend-api/internal/workers/job_worker.go
+++ b/veza-backend-api/internal/workers/job_worker.go
@@ -280,6 +280,8 @@ func (w *JobWorker) executeJob(ctx context.Context, job Job) error {
 		return w.processThumbnailJob(ctx, job)
 	case "analytics":
 		return w.processAnalyticsJob(ctx, job)
+	case services.TypeTranscoding:
+		return w.processTranscodingJob(ctx, job)
 	default:
 		return fmt.Errorf("unknown job type: %s", job.Type)
 	}
@@ -368,6 +370,20 @@ func (w *JobWorker) EnqueueThumbnailJob(inputPath, outputPath string, width, hei
 	w.Enqueue(job)
 }
 
+// EnqueueTranscodingJob enqueues a transcoding job (HLS/ffmpeg - stub implementation)
+func (w *JobWorker) EnqueueTranscodingJob(trackID uuid.UUID, inputPath, outputDir string) {
+	job := Job{
+		Type:     services.TypeTranscoding,
+		Priority: 2,
+		Payload: map[string]interface{}{
+			"track_id":    trackID.String(),
+			"input_path":  inputPath,
+			"output_dir":  outputDir,
+		},
+	}
+	w.Enqueue(job)
+}
+
 // EnqueueAnalyticsJob helper
 func (w *JobWorker) EnqueueAnalyticsJob(eventName string, userID *uuid.UUID, payload map[string]interface{}) {
 	jobPayload := map[string]interface{}{
@@ -448,6 +464,25 @@ func (w *JobWorker) processAnalyticsJob(ctx context.Context, job Job) error {
 	return analyticsJob.Execute(ctx, w.db, w.logger)
 }
 
+// processTranscodingJob processes HLS/audio transcoding (stub - ffmpeg integration TODO)
+func (w *JobWorker) processTranscodingJob(ctx context.Context, job Job) error {
+	p := job.Payload
+	trackIDStr, _ := p["track_id"].(string)
+	inputPath, _ := p["input_path"].(string)
+	outputDir, _ := p["output_dir"].(string)
+
+	if trackIDStr == "" || inputPath == "" {
+		return fmt.Errorf("transcoding job missing track_id or input_path")
+	}
+
+	// Stub: log and succeed. Actual ffmpeg/HLS transcoding to be implemented.
+	w.logger.Info("Transcoding job (stub)",
+		zap.String("track_id", trackIDStr),
+		zap.String("input_path", inputPath),
+		zap.String("output_dir", outputDir))
+	return nil
+}
+
 // GetStats retourne les stats DB si possible
 func (w *JobWorker) GetStats() map[string]interface{} {
 	var pending, processing, failed int64
diff --git a/veza-backend-api/migrations/081_create_playback_analytics.sql b/veza-backend-api/migrations/081_create_playback_analytics.sql
new file mode 100644
index 000000000..ce7acd960
--- /dev/null
+++ b/veza-backend-api/migrations/081_create_playback_analytics.sql
@@ -0,0 +1,25 @@
+-- 081_create_playback_analytics.sql
+-- Playback analytics for track listening events (BE-API-019)
+
+CREATE TABLE IF NOT EXISTS public.playback_analytics (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    track_id UUID NOT NULL REFERENCES public.tracks(id) ON DELETE CASCADE,
+    user_id UUID NOT NULL REFERENCES public.users(id) ON DELETE CASCADE,
+
+    play_time INT NOT NULL DEFAULT 0,
+    pause_count INT NOT NULL DEFAULT 0,
+    seek_count INT NOT NULL DEFAULT 0,
+    completion_rate DECIMAL(5,2) NOT NULL DEFAULT 0,
+
+    started_at TIMESTAMPTZ NOT NULL,
+    ended_at TIMESTAMPTZ,
+
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE INDEX IF NOT EXISTS idx_playback_analytics_track_id ON public.playback_analytics(track_id);
+CREATE INDEX IF NOT EXISTS idx_playback_analytics_user_id ON public.playback_analytics(user_id);
+CREATE INDEX IF NOT EXISTS idx_playback_analytics_created_at ON public.playback_analytics(created_at);
+
+COMMENT ON TABLE public.playback_analytics IS 'Playback analytics for track listening events';