diff --git a/internal/api/rest.go b/internal/api/rest.go
index e43cf51..f143a7f 100644
--- a/internal/api/rest.go
+++ b/internal/api/rest.go
@@ -473,11 +473,11 @@ func (api *RestApi) getCompleteJobById(rw http.ResponseWriter, r *http.Request)
 
 		job, err = api.JobRepository.FindById(id)
 	} else {
-		handleError(errors.New("the parameter 'id' is required"), http.StatusBadRequest, rw)
+		handleError(fmt.Errorf("the parameter 'id' is required"), http.StatusBadRequest, rw)
 		return
 	}
 	if err != nil {
-		handleError(fmt.Errorf("finding job failed: %w", err), http.StatusUnprocessableEntity, rw)
+		handleError(fmt.Errorf("finding job with db id %s failed: %w", id, err), http.StatusUnprocessableEntity, rw)
 		return
 	}
 
@@ -506,7 +506,7 @@ func (api *RestApi) getCompleteJobById(rw http.ResponseWriter, r *http.Request)
 	if r.URL.Query().Get("all-metrics") == "true" {
 		data, err = metricdata.LoadData(job, nil, scopes, r.Context())
 		if err != nil {
-			log.Warn("Error while loading job data")
+			log.Warnf("REST: error while loading all-metrics job data for JobID %d on %s", job.JobID, job.Cluster)
 			return
 		}
 	}
@@ -571,7 +571,7 @@ func (api *RestApi) getJobById(rw http.ResponseWriter, r *http.Request) {
 		return
 	}
 	if err != nil {
-		handleError(fmt.Errorf("finding job failed: %w", err), http.StatusUnprocessableEntity, rw)
+		handleError(fmt.Errorf("finding job with db id %s failed: %w", id, err), http.StatusUnprocessableEntity, rw)
 		return
 	}
 
@@ -603,7 +603,7 @@ func (api *RestApi) getJobById(rw http.ResponseWriter, r *http.Request) {
 
 	data, err := metricdata.LoadData(job, metrics, scopes, r.Context())
 	if err != nil {
-		log.Warn("Error while loading job data")
+		log.Warnf("REST: error while loading job data for JobID %d on %s", job.JobID, job.Cluster)
 		return
 	}
 
@@ -1096,12 +1096,12 @@ func (api *RestApi) deleteJobBefore(rw http.ResponseWriter, r *http.Request) {
 func (api *RestApi) checkAndHandleStopJob(rw http.ResponseWriter, job *schema.Job, req StopJobApiRequest) {
 	// Sanity checks
 	if job == nil || job.StartTime.Unix() >= req.StopTime || job.State != schema.JobStateRunning {
-		handleError(errors.New("stopTime must be larger than startTime and only running jobs can be stopped"), http.StatusBadRequest, rw)
+		handleError(fmt.Errorf("jobId %d (id %d) on %s : stopTime %d must be larger than startTime %d and only running jobs can be stopped (state is: %s)", job.JobID, job.ID, job.Cluster, req.StopTime, job.StartTime.Unix(), job.State), http.StatusBadRequest, rw)
 		return
 	}
 
 	if req.State != "" && !req.State.Valid() {
-		handleError(fmt.Errorf("invalid job state: %#v", req.State), http.StatusBadRequest, rw)
+		handleError(fmt.Errorf("jobId %d (id %d) on %s : invalid requested job state: %#v", job.JobID, job.ID, job.Cluster, req.State), http.StatusBadRequest, rw)
 		return
 	} else if req.State == "" {
 		req.State = schema.JobStateCompleted
@@ -1111,11 +1111,11 @@ func (api *RestApi) checkAndHandleStopJob(rw http.ResponseWriter, job *schema.Jo
 	job.Duration = int32(req.StopTime - job.StartTime.Unix())
 	job.State = req.State
 	if err := api.JobRepository.Stop(job.ID, job.Duration, job.State, job.MonitoringStatus); err != nil {
-		handleError(fmt.Errorf("marking job as stopped failed: %w", err), http.StatusInternalServerError, rw)
+		handleError(fmt.Errorf("jobId %d (id %d) on %s : marking job as '%s' (duration: %d) in DB failed: %w", job.JobID, job.ID, job.Cluster, job.State, job.Duration, err), http.StatusInternalServerError, rw)
 		return
 	}
 
-	log.Printf("archiving job... (dbid: %d): cluster=%s, jobId=%d, user=%s, startTime=%s", job.ID, job.Cluster, job.JobID, job.User, job.StartTime)
+	log.Printf("archiving job... (dbid: %d): cluster=%s, jobId=%d, user=%s, startTime=%s, duration=%d, state=%s", job.ID, job.Cluster, job.JobID, job.User, job.StartTime, job.Duration, job.State)
 
 	// Send a response (with status OK). This means that erros that happen from here on forward
 	// can *NOT* be communicated to the client. If reading from a MetricDataRepository or