diff --git a/internal/anime/service/service.go b/internal/anime/service/service.go
index 16479ac..f6e19d7 100644
--- a/internal/anime/service/service.go
+++ b/internal/anime/service/service.go
@@ -6,6 +6,7 @@ import (
 	"mal/integrations/jikan"
 	"mal/internal/db"
 	"mal/internal/domain"
+	"mal/internal/observability"
 	"math/rand"
 	"sort"
 	"strings"
@@ -187,6 +188,13 @@ func (s *animeService) GetDiscoverForYou(ctx context.Context, userID string) (do
 	for i := range limit {
 		anime, fetchErr := s.jikan.GetAnimeByID(ctx, rankedIDs[i].id)
 		if fetchErr != nil {
+			observability.Warn(
+				"recommendation_anime_fetch_failed",
+				"anime",
+				"",
+				map[string]any{"anime_id": rankedIDs[i].id},
+				fetchErr,
+			)
 			continue
 		}
 		animes = append(animes, anime)
@@ -249,6 +257,13 @@ func (s *animeService) GetAiringSchedule(ctx context.Context, userID string) ([]
 		if errors.Is(err, context.Canceled) || errors.Is(err, context.DeadlineExceeded) {
 			return nil, err
 		}
+		observability.Warn(
+			"schedule_partial_fetch_failed",
+			"anime",
+			"",
+			map[string]any{"user_id": userID, "count": len(ids)},
+			err,
+		)
 		return animes, nil
 	}
 
diff --git a/internal/playback/service/service.go b/internal/playback/service/service.go
index 4d93dc8..5a0c148 100644
--- a/internal/playback/service/service.go
+++ b/internal/playback/service/service.go
@@ -12,6 +12,7 @@ import (
 	"mal/integrations/jikan"
 	"mal/internal/db"
 	"mal/internal/domain"
+	"mal/internal/observability"
 	"mal/pkg/net/limits"
 	"mal/pkg/net/useragent"
 	"net/http"
@@ -316,10 +317,12 @@ func (s *playbackService) CompleteAnime(ctx context.Context, userID string, anim
 		}
 	}
 
-	_ = s.repo.DeleteContinueWatchingEntry(ctx, db.DeleteContinueWatchingEntryParams{
+	if err := s.repo.DeleteContinueWatchingEntry(ctx, db.DeleteContinueWatchingEntryParams{
 		UserID:  userID,
 		AnimeID: animeID,
-	})
+	}); err != nil {
+		return err
+	}
 	if err := s.repo.SaveWatchProgress(ctx, db.SaveWatchProgressParams{
 		UserID:             userID,
 		AnimeID:            animeID,
@@ -328,12 +331,20 @@ func (s *playbackService) CompleteAnime(ctx context.Context, userID string, anim
 	}); err != nil {
 		return err
 	}
-	_ = s.auditSvc.Record(ctx, domain.AuditEvent{
+	if err := s.auditSvc.Record(ctx, domain.AuditEvent{
 		UserID:       userID,
 		Action:       "watch_completed",
 		ResourceType: "anime",
 		ResourceID:   strconv.FormatInt(animeID, 10),
-	})
+	}); err != nil {
+		observability.Warn(
+			"audit_record_failed",
+			"playback",
+			"",
+			map[string]any{"user_id": userID, "anime_id": animeID, "action": "watch_completed"},
+			err,
+		)
+	}
 	return nil
 }
 
diff --git a/internal/watchlist/service/service.go b/internal/watchlist/service/service.go
index bbb1f2c..7c85e3f 100644
--- a/internal/watchlist/service/service.go
+++ b/internal/watchlist/service/service.go
@@ -23,15 +23,18 @@ func (s *watchlistService) UpdateEntry(ctx context.Context, userID string, anime
 	_, err := s.repo.GetAnime(ctx, animeID)
 	if err != nil {
 		anime, err := s.jikan.GetAnimeByID(ctx, int(animeID))
-		if err == nil {
-			_, _ = s.repo.UpsertAnime(ctx, db.UpsertAnimeParams{
-				ID:            int64(anime.MalID),
-				TitleOriginal: anime.Title,
-				TitleEnglish:  sql.NullString{String: anime.TitleEnglish, Valid: anime.TitleEnglish != ""},
-				TitleJapanese: sql.NullString{String: anime.TitleJapanese, Valid: anime.TitleJapanese != ""},
-				ImageUrl:      anime.ImageURL(),
-				Airing:        sql.NullBool{Bool: anime.Airing, Valid: true},
-			})
+		if err != nil {
+			return err
+		}
+		if _, err := s.repo.UpsertAnime(ctx, db.UpsertAnimeParams{
+			ID:            int64(anime.MalID),
+			TitleOriginal: anime.Title,
+			TitleEnglish:  sql.NullString{String: anime.TitleEnglish, Valid: anime.TitleEnglish != ""},
+			TitleJapanese: sql.NullString{String: anime.TitleJapanese, Valid: anime.TitleJapanese != ""},
+			ImageUrl:      anime.ImageURL(),
+			Airing:        sql.NullBool{Bool: anime.Airing, Valid: true},
+		}); err != nil {
+			return err
 		}
 	}
 
@@ -96,10 +99,12 @@ func (s *watchlistService) GetContinueWatchingEntry(ctx context.Context, userID
 }
 
 func (s *watchlistService) DeleteContinueWatching(ctx context.Context, userID string, animeID int64) error {
-	_ = s.repo.DeleteContinueWatchingEntry(ctx, db.DeleteContinueWatchingEntryParams{
+	if err := s.repo.DeleteContinueWatchingEntry(ctx, db.DeleteContinueWatchingEntryParams{
 		UserID:  userID,
 		AnimeID: animeID,
-	})
+	}); err != nil {
+		return err
+	}
 	return s.repo.SaveWatchProgress(ctx, db.SaveWatchProgressParams{
 		UserID:             userID,
 		AnimeID:            animeID,