diff --git a/cmd/api-server/main.go b/cmd/api-server/main.go
index 08a93ab..0dbbb78 100644
--- a/cmd/api-server/main.go
+++ b/cmd/api-server/main.go
@@ -24,7 +24,7 @@ func main() {
 	serviceVersion := "0.1.0"
 
 	if err := run(serviceName, serviceVersion); err != nil {
-		slog.Error("Service crashed")
+		slog.Error("service crashed")
 		os.Exit(1)
 	}
 }
@@ -33,7 +33,7 @@ func run(serviceName string, serviceVersion string) error {
 	_ = godotenv.Load(".env")
 	setupLogging()
 
-	slog.Info("Starting service", slog.String("service", serviceName), slog.String("version", serviceVersion))
+	slog.Info("starting service", slog.String("service", serviceName), slog.String("version", serviceVersion))
 
 	cfg := config.Load()
 
@@ -45,7 +45,7 @@ func run(serviceName string, serviceVersion string) error {
 	}
 	shutdownTelemetry, err := telemetry.Init(context.Background(), telCfg)
 	if err != nil {
-		slog.Error("Failed to initialize telemetry", err)
+		slog.Error("failed to initialize telemetry", err)
 		return err
 	}
 	defer func() {
@@ -53,31 +53,31 @@ func run(serviceName string, serviceVersion string) error {
 		defer cancel()
 
 		if err := shutdownTelemetry(shutdownCtx); err != nil {
-			slog.Error("Failed to shutdown telemetry", slog.Any("error", err))
+			slog.Error("failed to shutdown telemetry", slog.Any("error", err))
 		}
 	}()
 
 	db, err := database.New(context.Background(), cfg.DatabaseURL)
 	if err != nil {
-		slog.Error("Failed to initialize database", slog.Any("error", err))
+		slog.Error("failed to initialize database", slog.Any("error", err))
 		return err
 	}
 	defer func() {
 		err := db.Close()
 		if err != nil {
-			slog.Error("Failed to close database connection", slog.Any("error", err))
+			slog.Error("failed to close database connection", slog.Any("error", err))
 		}
 	}()
 
 	if err := database.RunMigrations(db); err != nil {
-		slog.Error("Failed to run migrations", slog.Any("error", err))
+		slog.Error("failed to run migrations", slog.Any("error", err))
 	}
 
 	srv := makeServer(db, cfg.Port)
 	go func() {
-		slog.Info("Starting http server", "addr", srv.Addr)
+		slog.Info("starting http server", "addr", srv.Addr)
 		if err := srv.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
-			slog.Error("Failed to start http server", err)
+			slog.Error("failed to start http server", err)
 			os.Exit(1)
 		}
 	}()
@@ -85,17 +85,17 @@ func run(serviceName string, serviceVersion string) error {
 	quit := make(chan os.Signal, 1)
 	signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
 	sig := <-quit
-	slog.Info("Shutting down server...", slog.String("signal", sig.String()))
+	slog.Info("shutting down server...", slog.String("signal", sig.String()))
 
 	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
 	defer cancel()
 
 	if err := srv.Shutdown(ctx); err != nil {
-		slog.Error("Server forced to shutdown", slog.Any("error", err))
+		slog.Error("server forced to shutdown", slog.Any("error", err))
 		return err
 	}
 
-	slog.Info("Service shutdown successful!")
+	slog.Info("service shutdown successful!")
 	return nil
 }
 
diff --git a/internal/api/handler/default.go b/internal/api/handler/default.go
index 8b4855d..a5f2f3a 100644
--- a/internal/api/handler/default.go
+++ b/internal/api/handler/default.go
@@ -39,7 +39,7 @@ func DefaultHandler(w http.ResponseWriter, r *http.Request) {
 			resp.Form[k] = v[0]
 		}
 	} else {
-		slog.ErrorContext(ctx, "Error parsing form", slog.Any("error", err))
+		slog.ErrorContext(ctx, "error parsing form", slog.Any("error", err))
 	}
 
 	response.JSON(ctx, w, http.StatusOK, resp)
diff --git a/internal/api/handler/list.go b/internal/api/handler/list.go
index 513c5ce..08630fa 100644
--- a/internal/api/handler/list.go
+++ b/internal/api/handler/list.go
@@ -18,18 +18,18 @@ func (h *ListHandler) CreateList(w http.ResponseWriter, r *http.Request) {
 
 	payload, err := request.DecodeCreateList(r)
 	if err != nil {
-		slog.ErrorContext(ctx, "Failed to decode create list payload", slog.Any("error", err))
-		response.Error(ctx, w, http.StatusBadRequest, "Failed to decode request body")
+		slog.ErrorContext(ctx, "failed to decode create list payload", slog.Any("error", err))
+		response.Error(ctx, w, http.StatusBadRequest, "failed to decode request body")
 		return
 	}
 
 	list, err := h.ListService.Create(ctx, payload.Name, payload.UserIDs)
 	if err != nil {
-		slog.ErrorContext(ctx, "Failed to create list", slog.Any("error", err))
-		response.Error(ctx, w, http.StatusInternalServerError, "Failed to create list")
+		slog.ErrorContext(ctx, "failed to create list", slog.Any("error", err))
+		response.Error(ctx, w, http.StatusInternalServerError, "failed to create list")
 		return
 	}
 
-	slog.InfoContext(ctx, "Created list successfully", slog.Any("list_id", list.ID))
+	slog.InfoContext(ctx, "created list successfully", slog.Any("list_id", list.ID))
 	response.JSON(ctx, w, http.StatusCreated, list)
 }
diff --git a/internal/api/response/json.go b/internal/api/response/json.go
index e73f217..f718b28 100644
--- a/internal/api/response/json.go
+++ b/internal/api/response/json.go
@@ -14,7 +14,7 @@ func JSON(ctx context.Context, w http.ResponseWriter, status int, data any) {
 		w.WriteHeader(http.StatusInternalServerError)
 		_, err := w.Write([]byte(`{"error": "internal server error: failed to marshal response"}`))
 		if err != nil {
-			slog.ErrorContext(ctx, "Failed to write JSON", slog.Any("error", err))
+			slog.ErrorContext(ctx, "failed to write json", slog.Any("error", err))
 			return
 		}
 		return
@@ -24,7 +24,7 @@ func JSON(ctx context.Context, w http.ResponseWriter, status int, data any) {
 	w.WriteHeader(status)
 	_, err = w.Write(payload)
 	if err != nil {
-		slog.ErrorContext(ctx, "Failed to write response", slog.Any("error", err))
+		slog.ErrorContext(ctx, "failed to write response", slog.Any("error", err))
 		return
 	}
 }
diff --git a/internal/config/config.go b/internal/config/config.go
index a4afd5f..f3dcdce 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -47,7 +47,7 @@ func assignIntFromEnv(key string, target *int) {
 	if val, exists := os.LookupEnv(key); exists {
 		parsed, err := strconv.Atoi(val)
 		if err != nil {
-			slog.Error("Failed to parse environment variable", slog.String("var", key), slog.Any("error", err))
+			slog.Error("failed to parse environment variable", slog.String("var", key), slog.Any("error", err))
 		} else {
 			*target = parsed
 		}
diff --git a/internal/database/migrate.go b/internal/database/migrate.go
index c251815..70cfa27 100644
--- a/internal/database/migrate.go
+++ b/internal/database/migrate.go
@@ -20,6 +20,12 @@ func RunMigrations(db *sql.DB) error {
 	if err != nil {
 		return fmt.Errorf("failed to load embedded migrations: %w", err)
 	}
+	defer func() {
+		err := sourceDriver.Close()
+		if err != nil {
+			slog.Error("failed to close migrations source", slog.Any("error", err))
+		}
+	}()
 
 	dbDriver, err := postgres.WithInstance(db, &postgres.Config{})
 	if err != nil {
@@ -31,13 +37,13 @@ func RunMigrations(db *sql.DB) error {
 		return fmt.Errorf("failed to initialize migrator: %w", err)
 	}
 
-	slog.Info("Running database migrations...")
+	slog.Info("running database migrations...")
 	err = m.Up()
 
 	if err != nil && !errors.Is(err, migrate.ErrNoChange) {
 		return fmt.Errorf("failed to run database migrations: %w", err)
 	}
 
-	slog.Info("Database migrations applied successfully")
+	slog.Info("database migrations applied successfully")
 	return nil
 }
diff --git a/internal/repository/list.go b/internal/repository/list.go
index 3671bc1..fede32b 100644
--- a/internal/repository/list.go
+++ b/internal/repository/list.go
@@ -25,7 +25,7 @@ func (r *ListRepo) CreateList(ctx context.Context, name string, userIDs []string
 	defer func() {
 		err := tx.Rollback()
 		if err != nil {
-			slog.Error("Failed to rollback transaction", slog.Any("error", err))
+			slog.Error("failed to rollback transaction", slog.Any("error", err))
 		}
 	}()
 
@@ -46,7 +46,7 @@ func (r *ListRepo) CreateList(ctx context.Context, name string, userIDs []string
 	defer func() {
 		err := stmt.Close()
 		if err != nil {
-
+			slog.Error("failed to close user/list association statement", slog.Any("error", err))
 		}
 	}()
 
diff --git a/internal/telemetry/otel.go b/internal/telemetry/otel.go
index d24c86a..b517fa5 100644
--- a/internal/telemetry/otel.go
+++ b/internal/telemetry/otel.go
@@ -53,7 +53,7 @@ func Init(ctx context.Context, cfg Config) (func(context.Context) error, error)
 	)
 
 	metricExporter, err := otlpmetricgrpc.New(ctx,
-		otlpmetricgrpc.WithInsecure(),
+		otlpmetricgrpc.WithInsecure(), // TODO: for local development
 		otlpmetricgrpc.WithEndpoint(cfg.Endpoint),
 	)
 	if err != nil {