diff --git a/internal/auth/auth.go b/internal/auth/auth.go
index 4d5fe5e..1b3ac38 100644
--- a/internal/auth/auth.go
+++ b/internal/auth/auth.go
@@ -94,6 +94,7 @@ func Init(db *sqlx.DB,
 		roles    varchar(255) NOT NULL DEFAULT "[]",
 		email    varchar(255) DEFAULT NULL);`)
 	if err != nil {
+		log.Error("Error while initializing authentication -> create user table failed")
 		return nil, err
 	}
 
@@ -102,12 +103,14 @@ func Init(db *sqlx.DB,
 		log.Warn("environment variable 'SESSION_KEY' not set (will use non-persistent random key)")
 		bytes := make([]byte, 32)
 		if _, err := rand.Read(bytes); err != nil {
+			log.Error("Error while initializing authentication -> failed to generate random bytes for session key")
 			return nil, err
 		}
 		auth.sessionStore = sessions.NewCookieStore(bytes)
 	} else {
 		bytes, err := base64.StdEncoding.DecodeString(sessKey)
 		if err != nil {
+			log.Error("Error while initializing authentication -> decoding session key failed")
 			return nil, err
 		}
 		auth.sessionStore = sessions.NewCookieStore(bytes)
@@ -115,12 +118,14 @@ func Init(db *sqlx.DB,
 
 	auth.LocalAuth = &LocalAuthenticator{}
 	if err := auth.LocalAuth.Init(auth, nil); err != nil {
+		log.Error("Error while initializing authentication -> localAuth init failed")
 		return nil, err
 	}
 	auth.authenticators = append(auth.authenticators, auth.LocalAuth)
 
 	auth.JwtAuth = &JWTAuthenticator{}
 	if err := auth.JwtAuth.Init(auth, configs["jwt"]); err != nil {
+		log.Error("Error while initializing authentication -> jwtAuth init failed")
 		return nil, err
 	}
 	auth.authenticators = append(auth.authenticators, auth.JwtAuth)
@@ -128,6 +133,7 @@ func Init(db *sqlx.DB,
 	if config, ok := configs["ldap"]; ok {
 		auth.LdapAuth = &LdapAuthenticator{}
 		if err := auth.LdapAuth.Init(auth, config); err != nil {
+			log.Error("Error while initializing authentication -> ldapAuth init failed")
 			return nil, err
 		}
 		auth.authenticators = append(auth.authenticators, auth.LdapAuth)
@@ -142,6 +148,7 @@ func (auth *Authentication) AuthViaSession(
 
 	session, err := auth.sessionStore.Get(r, "session")
 	if err != nil {
+		log.Error("Error while getting session store")
 		return nil, err
 	}
 
diff --git a/internal/auth/jwt.go b/internal/auth/jwt.go
index 798023e..45b1473 100644
--- a/internal/auth/jwt.go
+++ b/internal/auth/jwt.go
@@ -45,11 +45,13 @@ func (ja *JWTAuthenticator) Init(auth *Authentication, conf interface{}) error {
 	} else {
 		bytes, err := base64.StdEncoding.DecodeString(pubKey)
 		if err != nil {
+			log.Error("Could not decode JWT public key")
 			return err
 		}
 		ja.publicKey = ed25519.PublicKey(bytes)
 		bytes, err = base64.StdEncoding.DecodeString(privKey)
 		if err != nil {
+			log.Error("Could not decode JWT private key")
 			return err
 		}
 		ja.privateKey = ed25519.PrivateKey(bytes)
@@ -58,6 +60,7 @@ func (ja *JWTAuthenticator) Init(auth *Authentication, conf interface{}) error {
 	if pubKey = os.Getenv("CROSS_LOGIN_JWT_HS512_KEY"); pubKey != "" {
 		bytes, err := base64.StdEncoding.DecodeString(pubKey)
 		if err != nil {
+			log.Error("Could not decode cross login JWT HS512 key")
 			return err
 		}
 		ja.loginTokenKey = bytes
@@ -68,6 +71,7 @@ func (ja *JWTAuthenticator) Init(auth *Authentication, conf interface{}) error {
 	if keyFound && pubKeyCrossLogin != "" {
 		bytes, err := base64.StdEncoding.DecodeString(pubKeyCrossLogin)
 		if err != nil {
+			log.Error("Could not decode cross login JWT public key")
 			return err
 		}
 		ja.publicKeyCrossLogin = ed25519.PublicKey(bytes)
@@ -126,10 +130,12 @@ func (ja *JWTAuthenticator) Login(
 		return nil, fmt.Errorf("AUTH/JWT > unkown signing method for login token: %s (known: HS256, HS512, EdDSA)", t.Method.Alg())
 	})
 	if err != nil {
+		log.Error("Error while parsing jwt token")
 		return nil, err
 	}
 
 	if err := token.Claims.Valid(); err != nil {
+		log.Warn("jwt token claims are not valid")
 		return nil, err
 	}
 
@@ -151,6 +157,7 @@ func (ja *JWTAuthenticator) Login(
 	if user == nil {
 		user, err = ja.auth.GetUser(sub)
 		if err != nil && err != sql.ErrNoRows {
+			log.Errorf("Error while loading user '%#v'", sub)
 			return nil, err
 		} else if user == nil {
 			user = &User{
@@ -159,6 +166,7 @@ func (ja *JWTAuthenticator) Login(
 				AuthSource: AuthViaToken,
 			}
 			if err := ja.auth.AddUser(user); err != nil {
+				log.Errorf("Error while adding user '%#v' to auth from token", user.Username)
 				return nil, err
 			}
 		}
@@ -223,11 +231,13 @@ func (ja *JWTAuthenticator) Auth(
 		return ja.publicKey, nil
 	})
 	if err != nil {
+		log.Error("Error while parsing token")
 		return nil, err
 	}
 
 	// Check token validity
 	if err := token.Claims.Valid(); err != nil {
+		log.Warn("jwt token claims are not valid")
 		return nil, err
 	}
 
diff --git a/internal/auth/ldap.go b/internal/auth/ldap.go
index 1e0235c..f1b8fe8 100644
--- a/internal/auth/ldap.go
+++ b/internal/auth/ldap.go
@@ -39,10 +39,12 @@ func (la *LdapAuthenticator) Init(
 	if la.config != nil && la.config.SyncInterval != "" {
 		interval, err := time.ParseDuration(la.config.SyncInterval)
 		if err != nil {
+			log.Errorf("Could not parse duration for sync interval: %#v", la.config.SyncInterval)
 			return err
 		}
 
 		if interval == 0 {
+			log.Note("Sync interval is zero")
 			return nil
 		}
 
@@ -76,12 +78,14 @@ func (la *LdapAuthenticator) Login(
 
 	l, err := la.getLdapConnection(false)
 	if err != nil {
+		log.Error("Error while getting ldap connection")
 		return nil, err
 	}
 	defer l.Close()
 
 	userDn := strings.Replace(la.config.UserBind, "{username}", user.Username, -1)
 	if err := l.Bind(userDn, r.FormValue("password")); err != nil {
+		log.Error("Error while binding to ldap connection")
 		return nil, err
 	}
 
@@ -104,12 +108,14 @@ func (la *LdapAuthenticator) Sync() error {
 	users := map[string]int{}
 	rows, err := la.auth.db.Query(`SELECT username FROM user WHERE user.ldap = 1`)
 	if err != nil {
+		log.Error("Error while querying LDAP users")
 		return err
 	}
 
 	for rows.Next() {
 		var username string
 		if err := rows.Scan(&username); err != nil {
+			log.Errorf("Error while scanning for user '%s'", username)
 			return err
 		}
 
@@ -118,6 +124,7 @@ func (la *LdapAuthenticator) Sync() error {
 
 	l, err := la.getLdapConnection(true)
 	if err != nil {
+		log.Error("LDAP connection error")
 		return err
 	}
 	defer l.Close()
@@ -126,6 +133,7 @@ func (la *LdapAuthenticator) Sync() error {
 		la.config.UserBase, ldap.ScopeWholeSubtree, ldap.NeverDerefAliases, 0, 0, false,
 		la.config.UserFilter, []string{"dn", "uid", "gecos"}, nil))
 	if err != nil {
+		log.Error("LDAP search error")
 		return err
 	}
 
@@ -149,6 +157,7 @@ func (la *LdapAuthenticator) Sync() error {
 		if where == IN_DB && la.config.SyncDelOldUsers {
 			log.Debugf("sync: remove %#v (does not show up in LDAP anymore)", username)
 			if _, err := la.auth.db.Exec(`DELETE FROM user WHERE user.username = ?`, username); err != nil {
+				log.Errorf("User '%s' not in LDAP anymore: Delete from DB failed", username)
 				return err
 			}
 		} else if where == IN_LDAP {
@@ -156,6 +165,7 @@ func (la *LdapAuthenticator) Sync() error {
 			log.Debugf("sync: add %#v (name: %#v, roles: [user], ldap: true)", username, name)
 			if _, err := la.auth.db.Exec(`INSERT INTO user (username, ldap, name, roles) VALUES (?, ?, ?, ?)`,
 				username, 1, name, "[\""+RoleUser+"\"]"); err != nil {
+				log.Errorf("User '%s' new in LDAP: Insert into DB failed", username)
 				return err
 			}
 		}
@@ -170,12 +180,14 @@ func (la *LdapAuthenticator) getLdapConnection(admin bool) (*ldap.Conn, error) {
 
 	conn, err := ldap.DialURL(la.config.Url)
 	if err != nil {
+		log.Error("LDAP URL dial failed")
 		return nil, err
 	}
 
 	if admin {
 		if err := conn.Bind(la.config.SearchDN, la.syncPassword); err != nil {
 			conn.Close()
+			log.Error("LDAP connection bind failed")
 			return nil, err
 		}
 	}
diff --git a/internal/auth/users.go b/internal/auth/users.go
index f890c1b..093fb14 100644
--- a/internal/auth/users.go
+++ b/internal/auth/users.go
@@ -25,6 +25,7 @@ func (auth *Authentication) GetUser(username string) (*User, error) {
 	if err := sq.Select("password", "ldap", "name", "roles", "email").From("user").
 		Where("user.username = ?", username).RunWith(auth.db).
 		QueryRow().Scan(&hashedPassword, &user.AuthSource, &name, &rawRoles, &email); err != nil {
+		log.Errorf("Error while querying user '%#v' from database", username)
 		return nil, err
 	}
 
@@ -33,6 +34,7 @@ func (auth *Authentication) GetUser(username string) (*User, error) {
 	user.Email = email.String
 	if rawRoles.Valid {
 		if err := json.Unmarshal([]byte(rawRoles.String), &user.Roles); err != nil {
+			log.Error("Error while unmarshaling raw roles from DB")
 			return nil, err
 		}
 	}
@@ -57,6 +59,7 @@ func (auth *Authentication) AddUser(user *User) error {
 	if user.Password != "" {
 		password, err := bcrypt.GenerateFromPassword([]byte(user.Password), bcrypt.DefaultCost)
 		if err != nil {
+			log.Error("Error while encrypting new user password")
 			return err
 		}
 		cols = append(cols, "password")
@@ -64,6 +67,7 @@ func (auth *Authentication) AddUser(user *User) error {
 	}
 
 	if _, err := sq.Insert("user").Columns(cols...).Values(vals...).RunWith(auth.db).Exec(); err != nil {
+		log.Errorf("Error while inserting new user '%#v' into DB", user.Username)
 		return err
 	}
 
@@ -74,6 +78,7 @@ func (auth *Authentication) AddUser(user *User) error {
 func (auth *Authentication) DelUser(username string) error {
 
 	_, err := auth.db.Exec(`DELETE FROM user WHERE user.username = ?`, username)
+	log.Errorf("Error while deleting user '%s' from DB", username)
 	return err
 }
 
@@ -86,6 +91,7 @@ func (auth *Authentication) ListUsers(specialsOnly bool) ([]*User, error) {
 
 	rows, err := q.RunWith(auth.db).Query()
 	if err != nil {
+		log.Error("Error while querying user list")
 		return nil, err
 	}
 
@@ -96,10 +102,12 @@ func (auth *Authentication) ListUsers(specialsOnly bool) ([]*User, error) {
 		user := &User{}
 		var name, email sql.NullString
 		if err := rows.Scan(&user.Username, &name, &email, &rawroles); err != nil {
+			log.Error("Error while scanning user list")
 			return nil, err
 		}
 
 		if err := json.Unmarshal([]byte(rawroles), &user.Roles); err != nil {
+			log.Error("Error while unmarshaling raw role list")
 			return nil, err
 		}
 
@@ -117,6 +125,7 @@ func (auth *Authentication) AddRole(
 
 	user, err := auth.GetUser(username)
 	if err != nil {
+		log.Errorf("Could not load user '%s'", username)
 		return err
 	}
 
@@ -132,6 +141,7 @@ func (auth *Authentication) AddRole(
 
 	roles, _ := json.Marshal(append(user.Roles, role))
 	if _, err := sq.Update("user").Set("roles", roles).Where("user.username = ?", username).RunWith(auth.db).Exec(); err != nil {
+		log.Errorf("Error while adding new role for user '%s'", user.Username)
 		return err
 	}
 	return nil
@@ -140,6 +150,7 @@ func (auth *Authentication) AddRole(
 func (auth *Authentication) RemoveRole(ctx context.Context, username string, role string) error {
 	user, err := auth.GetUser(username)
 	if err != nil {
+		log.Errorf("Could not load user '%s'", username)
 		return err
 	}
 
@@ -160,6 +171,7 @@ func (auth *Authentication) RemoveRole(ctx context.Context, username string, rol
 	if (exists == true) {
 		var mroles, _ = json.Marshal(newroles)
 		if _, err := sq.Update("user").Set("roles", mroles).Where("user.username = ?", username).RunWith(auth.db).Exec(); err != nil {
+			log.Errorf("Error while removing role for user '%s'", user.Username)
 			return err
 		}
 		return nil
@@ -179,9 +191,11 @@ func FetchUser(ctx context.Context, db *sqlx.DB, username string) (*model.User,
 	if err := sq.Select("name", "email").From("user").Where("user.username = ?", username).
 		RunWith(db).QueryRow().Scan(&name, &email); err != nil {
 		if err == sql.ErrNoRows {
+			log.Errorf("User '%s' Not found in DB", username)
 			return nil, nil
 		}
 
+		log.Errorf("Error while fetching user '%s'", username)
 		return nil, err
 	}
 
diff --git a/internal/graph/schema.resolvers.go b/internal/graph/schema.resolvers.go
index 139da17..f2653a6 100644
--- a/internal/graph/schema.resolvers.go
+++ b/internal/graph/schema.resolvers.go
@@ -44,6 +44,7 @@ func (r *jobResolver) UserData(ctx context.Context, obj *schema.Job) (*model.Use
 func (r *mutationResolver) CreateTag(ctx context.Context, typeArg string, name string) (*schema.Tag, error) {
 	id, err := r.Repo.CreateTag(typeArg, name)
 	if err != nil {
+		log.Warn("Error while creating tag")
 		return nil, err
 	}
 
@@ -59,6 +60,7 @@ func (r *mutationResolver) DeleteTag(ctx context.Context, id string) (string, er
 func (r *mutationResolver) AddTagsToJob(ctx context.Context, job string, tagIds []string) ([]*schema.Tag, error) {
 	jid, err := strconv.ParseInt(job, 10, 64)
 	if err != nil {
+		log.Warn("Error while adding tag to job")
 		return nil, err
 	}
 
@@ -66,10 +68,12 @@ func (r *mutationResolver) AddTagsToJob(ctx context.Context, job string, tagIds
 	for _, tagId := range tagIds {
 		tid, err := strconv.ParseInt(tagId, 10, 64)
 		if err != nil {
+			log.Warn("Error while parsing tag id")
 			return nil, err
 		}
 
 		if tags, err = r.Repo.AddTag(jid, tid); err != nil {
+			log.Warn("Error while adding tag")
 			return nil, err
 		}
 	}
@@ -81,6 +85,7 @@ func (r *mutationResolver) AddTagsToJob(ctx context.Context, job string, tagIds
 func (r *mutationResolver) RemoveTagsFromJob(ctx context.Context, job string, tagIds []string) ([]*schema.Tag, error) {
 	jid, err := strconv.ParseInt(job, 10, 64)
 	if err != nil {
+		log.Warn("Error while parsing job id")
 		return nil, err
 	}
 
@@ -88,10 +93,12 @@ func (r *mutationResolver) RemoveTagsFromJob(ctx context.Context, job string, ta
 	for _, tagId := range tagIds {
 		tid, err := strconv.ParseInt(tagId, 10, 64)
 		if err != nil {
+			log.Warn("Error while parsing tag id")
 			return nil, err
 		}
 
 		if tags, err = r.Repo.RemoveTag(jid, tid); err != nil {
+			log.Warn("Error while removing tag")
 			return nil, err
 		}
 	}
@@ -102,6 +109,7 @@ func (r *mutationResolver) RemoveTagsFromJob(ctx context.Context, job string, ta
 // UpdateConfiguration is the resolver for the updateConfiguration field.
 func (r *mutationResolver) UpdateConfiguration(ctx context.Context, name string, value string) (*string, error) {
 	if err := repository.GetUserCfgRepo().UpdateConfig(name, value, auth.GetUser(ctx)); err != nil {
+		log.Warn("Error while updating user config")
 		return nil, err
 	}
 
@@ -127,6 +135,7 @@ func (r *queryResolver) User(ctx context.Context, username string) (*model.User,
 func (r *queryResolver) AllocatedNodes(ctx context.Context, cluster string) ([]*model.Count, error) {
 	data, err := r.Repo.AllocatedNodes(cluster)
 	if err != nil {
+		log.Warn("Error while fetching allocated nodes")
 		return nil, err
 	}
 
@@ -145,11 +154,13 @@ func (r *queryResolver) AllocatedNodes(ctx context.Context, cluster string) ([]*
 func (r *queryResolver) Job(ctx context.Context, id string) (*schema.Job, error) {
 	numericId, err := strconv.ParseInt(id, 10, 64)
 	if err != nil {
+		log.Warn("Error while parsing job id")
 		return nil, err
 	}
 
 	job, err := r.Repo.FindById(numericId)
 	if err != nil {
+		log.Warn("Error while finding job by id")
 		return nil, err
 	}
 
@@ -164,11 +175,13 @@ func (r *queryResolver) Job(ctx context.Context, id string) (*schema.Job, error)
 func (r *queryResolver) JobMetrics(ctx context.Context, id string, metrics []string, scopes []schema.MetricScope) ([]*model.JobMetricWithName, error) {
 	job, err := r.Query().Job(ctx, id)
 	if err != nil {
+		log.Warn("Error while querying job for metrics")
 		return nil, err
 	}
 
 	data, err := metricdata.LoadData(job, metrics, scopes, ctx)
 	if err != nil {
+		log.Warn("Error while loading job data")
 		return nil, err
 	}
 
@@ -205,11 +218,13 @@ func (r *queryResolver) Jobs(ctx context.Context, filter []*model.JobFilter, pag
 
 	jobs, err := r.Repo.QueryJobs(ctx, filter, page, order)
 	if err != nil {
+		log.Warn("Error while querying jobs")
 		return nil, err
 	}
 
 	count, err := r.Repo.CountJobs(ctx, filter)
 	if err != nil {
+		log.Warn("Error while counting jobs")
 		return nil, err
 	}
 
@@ -225,6 +240,7 @@ func (r *queryResolver) JobsStatistics(ctx context.Context, filter []*model.JobF
 func (r *queryResolver) JobsCount(ctx context.Context, filter []*model.JobFilter, groupBy model.Aggregate, weight *model.Weights, limit *int) ([]*model.Count, error) {
 	counts, err := r.Repo.CountGroupedJobs(ctx, groupBy, filter, weight, limit)
 	if err != nil {
+		log.Warn("Error while counting grouped jobs")
 		return nil, err
 	}
 
@@ -258,6 +274,7 @@ func (r *queryResolver) NodeMetrics(ctx context.Context, cluster string, nodes [
 
 	data, err := metricdata.LoadNodeData(cluster, metrics, nodes, scopes, from, to, ctx)
 	if err != nil {
+		log.Warn("Error while loading node data")
 		return nil, err
 	}
 
diff --git a/internal/graph/stats.go b/internal/graph/stats.go
index 5d8c4a3..2bdb59e 100644
--- a/internal/graph/stats.go
+++ b/internal/graph/stats.go
@@ -18,6 +18,7 @@ import (
 	"github.com/ClusterCockpit/cc-backend/internal/repository"
 	"github.com/ClusterCockpit/cc-backend/pkg/archive"
 	"github.com/ClusterCockpit/cc-backend/pkg/schema"
+	"github.com/ClusterCockpit/cc-backend/pkg/log"
 	sq "github.com/Masterminds/squirrel"
 )
 
@@ -68,6 +69,7 @@ func (r *queryResolver) jobsStatistics(ctx context.Context, filter []*model.JobF
 
 			rows, err := query.RunWith(r.DB).Query()
 			if err != nil {
+				log.Error("Error while querying DB for job statistics")
 				return nil, err
 			}
 
@@ -75,6 +77,7 @@ func (r *queryResolver) jobsStatistics(ctx context.Context, filter []*model.JobF
 				var id sql.NullString
 				var jobs, walltime, corehours sql.NullInt64
 				if err := rows.Scan(&id, &jobs, &walltime, &corehours); err != nil {
+					log.Error("Error while scanning rows")
 					return nil, err
 				}
 
@@ -103,6 +106,7 @@ func (r *queryResolver) jobsStatistics(ctx context.Context, filter []*model.JobF
 			query = repository.BuildWhereClause(f, query)
 		}
 		if err := query.RunWith(r.DB).QueryRow().Scan(&(stats[""].ShortJobs)); err != nil {
+			log.Error("Error while scanning rows for short job stats")
 			return nil, err
 		}
 	} else {
@@ -114,6 +118,7 @@ func (r *queryResolver) jobsStatistics(ctx context.Context, filter []*model.JobF
 		}
 		rows, err := query.RunWith(r.DB).Query()
 		if err != nil {
+			log.Error("Error while querying jobs for short jobs")
 			return nil, err
 		}
 
@@ -121,6 +126,7 @@ func (r *queryResolver) jobsStatistics(ctx context.Context, filter []*model.JobF
 			var id sql.NullString
 			var shortJobs sql.NullInt64
 			if err := rows.Scan(&id, &shortJobs); err != nil {
+				log.Error("Error while scanning rows for short jobs")
 				return nil, err
 			}
 
@@ -154,11 +160,13 @@ func (r *queryResolver) jobsStatistics(ctx context.Context, filter []*model.JobF
 			value := fmt.Sprintf(`CAST(ROUND((CASE WHEN job.job_state = "running" THEN %d - job.start_time ELSE job.duration END) / 3600) as int) as value`, time.Now().Unix())
 			stat.HistDuration, err = r.jobsStatisticsHistogram(ctx, value, filter, id, col)
 			if err != nil {
+				log.Error("Error while loading job statistics histogram: running jobs")
 				return nil, err
 			}
 
 			stat.HistNumNodes, err = r.jobsStatisticsHistogram(ctx, "job.num_nodes as value", filter, id, col)
 			if err != nil {
+				log.Error("Error while loading job statistics histogram: num nodes")
 				return nil, err
 			}
 		}
@@ -182,6 +190,7 @@ func (r *queryResolver) jobsStatisticsHistogram(ctx context.Context, value strin
 
 	rows, err := query.GroupBy("value").RunWith(r.DB).Query()
 	if err != nil {
+		log.Error("Error while running query")
 		return nil, err
 	}
 
@@ -189,6 +198,7 @@ func (r *queryResolver) jobsStatisticsHistogram(ctx context.Context, value strin
 	for rows.Next() {
 		point := model.HistoPoint{}
 		if err := rows.Scan(&point.Value, &point.Count); err != nil {
+			log.Error("Error while scanning rows")
 			return nil, err
 		}
 
@@ -208,6 +218,7 @@ func (r *queryResolver) rooflineHeatmap(
 
 	jobs, err := r.Repo.QueryJobs(ctx, filter, &model.PageRequest{Page: 1, ItemsPerPage: MAX_JOBS_FOR_ANALYSIS + 1}, nil)
 	if err != nil {
+		log.Error("Error while querying jobs for roofline")
 		return nil, err
 	}
 	if len(jobs) > MAX_JOBS_FOR_ANALYSIS {
@@ -228,6 +239,7 @@ func (r *queryResolver) rooflineHeatmap(
 
 		jobdata, err := metricdata.LoadData(job, []string{"flops_any", "mem_bw"}, []schema.MetricScope{schema.MetricScopeNode}, ctx)
 		if err != nil {
+			log.Error("Error while loading metrics for roofline")
 			return nil, err
 		}
 
@@ -272,6 +284,7 @@ func (r *queryResolver) rooflineHeatmap(
 func (r *queryResolver) jobsFootprints(ctx context.Context, filter []*model.JobFilter, metrics []string) (*model.Footprints, error) {
 	jobs, err := r.Repo.QueryJobs(ctx, filter, &model.PageRequest{Page: 1, ItemsPerPage: MAX_JOBS_FOR_ANALYSIS + 1}, nil)
 	if err != nil {
+		log.Error("Error while querying jobs for footprint")
 		return nil, err
 	}
 	if len(jobs) > MAX_JOBS_FOR_ANALYSIS {
@@ -290,6 +303,7 @@ func (r *queryResolver) jobsFootprints(ctx context.Context, filter []*model.JobF
 		}
 
 		if err := metricdata.LoadAverages(job, metrics, avgs, ctx); err != nil {
+			log.Error("Error while loading averages for footprint")
 			return nil, err
 		}
 
diff --git a/internal/metricdata/cc-metric-store.go b/internal/metricdata/cc-metric-store.go
index 9875390..31e675a 100644
--- a/internal/metricdata/cc-metric-store.go
+++ b/internal/metricdata/cc-metric-store.go
@@ -79,6 +79,7 @@ func (ccms *CCMetricStore) Init(rawConfig json.RawMessage) error {
 
 	var config CCMetricStoreConfig
 	if err := json.Unmarshal(rawConfig, &config); err != nil {
+		log.Error("Error while unmarshaling raw json config")
 		return err
 	}
 
@@ -125,11 +126,13 @@ func (ccms *CCMetricStore) doRequest(
 
 	buf := &bytes.Buffer{}
 	if err := json.NewEncoder(buf).Encode(body); err != nil {
+		log.Error("Error while encoding request body")
 		return nil, err
 	}
 
 	req, err := http.NewRequestWithContext(ctx, http.MethodPost, ccms.queryEndpoint, buf)
 	if err != nil {
+		log.Error("Error while building request body")
 		return nil, err
 	}
 	if ccms.jwt != "" {
@@ -138,6 +141,7 @@ func (ccms *CCMetricStore) doRequest(
 
 	res, err := ccms.client.Do(req)
 	if err != nil {
+		log.Error("Error while performing request")
 		return nil, err
 	}
 
@@ -147,6 +151,7 @@ func (ccms *CCMetricStore) doRequest(
 
 	var resBody ApiQueryResponse
 	if err := json.NewDecoder(bufio.NewReader(res.Body)).Decode(&resBody); err != nil {
+		log.Error("Error while decoding result body")
 		return nil, err
 	}
 
@@ -162,6 +167,7 @@ func (ccms *CCMetricStore) LoadData(
 	topology := archive.GetSubCluster(job.Cluster, job.SubCluster).Topology
 	queries, assignedScope, err := ccms.buildQueries(job, metrics, scopes)
 	if err != nil {
+		log.Error("Error while building queries")
 		return nil, err
 	}
 
@@ -176,6 +182,7 @@ func (ccms *CCMetricStore) LoadData(
 
 	resBody, err := ccms.doRequest(ctx, &req)
 	if err != nil {
+		log.Error("Error while performing request")
 		return nil, err
 	}
 
@@ -499,6 +506,7 @@ func (ccms *CCMetricStore) LoadStats(
 
 	queries, _, err := ccms.buildQueries(job, metrics, []schema.MetricScope{schema.MetricScopeNode})
 	if err != nil {
+		log.Error("Error while building query")
 		return nil, err
 	}
 
@@ -513,6 +521,7 @@ func (ccms *CCMetricStore) LoadStats(
 
 	resBody, err := ccms.doRequest(ctx, &req)
 	if err != nil {
+		log.Error("Error while performing request")
 		return nil, err
 	}
 
@@ -578,6 +587,7 @@ func (ccms *CCMetricStore) LoadNodeData(
 
 	resBody, err := ccms.doRequest(ctx, &req)
 	if err != nil {
+		log.Error("Error while performing request")
 		return nil, err
 	}
 
diff --git a/internal/metricdata/influxdb-v2.go b/internal/metricdata/influxdb-v2.go
index 349f8a8..62da698 100644
--- a/internal/metricdata/influxdb-v2.go
+++ b/internal/metricdata/influxdb-v2.go
@@ -37,6 +37,7 @@ type InfluxDBv2DataRepository struct {
 func (idb *InfluxDBv2DataRepository) Init(rawConfig json.RawMessage) error {
 	var config InfluxDBv2DataRepositoryConfig
 	if err := json.Unmarshal(rawConfig, &config); err != nil {
+		log.Error("Error while unmarshaling raw json config")
 		return err
 	}
 
@@ -121,6 +122,7 @@ func (idb *InfluxDBv2DataRepository) LoadData(
 
 		rows, err := idb.queryClient.Query(ctx, query)
 		if err != nil {
+			log.Error("Error while performing query")
 			return nil, err
 		}
 
@@ -203,6 +205,7 @@ func (idb *InfluxDBv2DataRepository) LoadData(
 	// Get Stats
 	stats, err := idb.LoadStats(job, metrics, ctx)
 	if err != nil {
+		log.Error("Error while loading statistics")
 		return nil, err
 	}
 
@@ -276,6 +279,7 @@ func (idb *InfluxDBv2DataRepository) LoadStats(
 
 		rows, err := idb.queryClient.Query(ctx, query)
 		if err != nil {
+			log.Error("Error while performing query")
 			return nil, err
 		}
 
diff --git a/internal/metricdata/metricdata.go b/internal/metricdata/metricdata.go
index 56bcdc6..d022f5e 100644
--- a/internal/metricdata/metricdata.go
+++ b/internal/metricdata/metricdata.go
@@ -46,6 +46,7 @@ func Init(disableArchive bool) error {
 				Kind string `json:"kind"`
 			}
 			if err := json.Unmarshal(cluster.MetricDataRepository, &kind); err != nil {
+				log.Error("Error while unmarshaling raw json MetricDataRepository")
 				return err
 			}
 
@@ -64,6 +65,7 @@ func Init(disableArchive bool) error {
 			}
 
 			if err := mdr.Init(cluster.MetricDataRepository); err != nil {
+				log.Error("Error initializing the MetricDataRepository")
 				return err
 			}
 			metricDataRepos[cluster.Name] = mdr
@@ -109,6 +111,7 @@ func LoadData(job *schema.Job,
 				if len(jd) != 0 {
 					log.Errorf("partial error: %s", err.Error())
 				} else {
+					log.Error("Error while loading job data from metric repository")
 					return err, 0, 0
 				}
 			}
@@ -116,6 +119,7 @@ func LoadData(job *schema.Job,
 		} else {
 			jd, err = archive.GetHandle().LoadJobData(job)
 			if err != nil {
+				log.Error("Error while loading job data from archive")
 				return err, 0, 0
 			}
 
@@ -163,6 +167,7 @@ func LoadData(job *schema.Job,
 	})
 
 	if err, ok := data.(error); ok {
+		log.Error("Error in returned dataset")
 		return nil, err
 	}
 
@@ -187,6 +192,7 @@ func LoadAverages(
 
 	stats, err := repo.LoadStats(job, metrics, ctx)
 	if err != nil {
+		log.Errorf("Error while loading statistics for job %#v (User %#v, Project %#v)", job.JobID, job.User, job.Project)
 		return err
 	}
 
@@ -231,6 +237,7 @@ func LoadNodeData(
 		if len(data) != 0 {
 			log.Errorf("partial error: %s", err.Error())
 		} else {
+			log.Error("Error while loading node data from metric repository")
 			return nil, err
 		}
 	}
@@ -303,6 +310,7 @@ func ArchiveJob(job *schema.Job, ctx context.Context) (*schema.JobMeta, error) {
 
 	jobData, err := LoadData(job, allMetrics, scopes, ctx)
 	if err != nil {
+		log.Error("Error wile loading job data for archiving")
 		return nil, err
 	}
 
diff --git a/internal/metricdata/prometheus.go b/internal/metricdata/prometheus.go
index 3c79866..dd8ceb8 100644
--- a/internal/metricdata/prometheus.go
+++ b/internal/metricdata/prometheus.go
@@ -154,6 +154,7 @@ func (pdb *PrometheusDataRepository) Init(rawConfig json.RawMessage) error {
 	var config PrometheusDataRepositoryConfig
 	// parse config
 	if err := json.Unmarshal(rawConfig, &config); err != nil {
+		log.Error("Error while unmarshaling raw json config")
 		return err
 	}
 	// support basic authentication
@@ -172,6 +173,7 @@ func (pdb *PrometheusDataRepository) Init(rawConfig json.RawMessage) error {
 		RoundTripper: rt,
 	})
 	if err != nil {
+		log.Error("Error while initializing new prometheus client")
 		return err
 	}
 	// init query client
@@ -295,6 +297,7 @@ func (pdb *PrometheusDataRepository) LoadData(
 			}
 			query, err := pdb.FormatQuery(metric, scope, nodes, job.Cluster)
 			if err != nil {
+				log.Error("Error while formatting prometheus query")
 				return nil, err
 			}
 
@@ -358,6 +361,7 @@ func (pdb *PrometheusDataRepository) LoadStats(
 
 	data, err := pdb.LoadData(job, metrics, []schema.MetricScope{schema.MetricScopeNode}, ctx)
 	if err != nil {
+		log.Error("Error while loading job for stats")
 		return nil, err
 	}
 	for metric, metricData := range data {
@@ -400,6 +404,7 @@ func (pdb *PrometheusDataRepository) LoadNodeData(
 			}
 			query, err := pdb.FormatQuery(metric, scope, nodes, cluster)
 			if err != nil {
+				log.Error("Error while formatting prometheus query")
 				return nil, err
 			}
 
diff --git a/internal/repository/init.go b/internal/repository/init.go
index 08b5565..1d3f403 100644
--- a/internal/repository/init.go
+++ b/internal/repository/init.go
@@ -100,6 +100,7 @@ func HandleImportFlag(flag string) error {
 
 		raw, err := os.ReadFile(files[0])
 		if err != nil {
+			log.Error("Error while reading metadata file for import")
 			return err
 		}
 
@@ -112,11 +113,13 @@ func HandleImportFlag(flag string) error {
 		dec.DisallowUnknownFields()
 		jobMeta := schema.JobMeta{BaseJob: schema.JobDefaults}
 		if err := dec.Decode(&jobMeta); err != nil {
+			log.Error("Error while decoding raw json metadata for import")
 			return err
 		}
 
 		raw, err = os.ReadFile(files[1])
 		if err != nil {
+			log.Error("Error while reading jobdata file for import")
 			return err
 		}
 
@@ -129,6 +132,7 @@ func HandleImportFlag(flag string) error {
 		dec.DisallowUnknownFields()
 		jobData := schema.JobData{}
 		if err := dec.Decode(&jobData); err != nil {
+			log.Error("Error while decoding raw json jobdata for import")
 			return err
 		}
 
@@ -136,6 +140,7 @@ func HandleImportFlag(flag string) error {
 		jobMeta.MonitoringStatus = schema.MonitoringStatusArchivingSuccessful
 		if job, err := GetJobRepository().Find(&jobMeta.JobID, &jobMeta.Cluster, &jobMeta.StartTime); err != sql.ErrNoRows {
 			if err != nil {
+				log.Error("Error while finding job in jobRepository")
 				return err
 			}
 
@@ -155,33 +160,40 @@ func HandleImportFlag(flag string) error {
 		job.FileBwAvg = loadJobStat(&jobMeta, "file_bw")
 		job.RawResources, err = json.Marshal(job.Resources)
 		if err != nil {
+			log.Error("Error while marshaling job resources")
 			return err
 		}
 		job.RawMetaData, err = json.Marshal(job.MetaData)
 		if err != nil {
+			log.Error("Error while marshaling job metadata")
 			return err
 		}
 
 		if err := SanityChecks(&job.BaseJob); err != nil {
+			log.Error("BaseJob SanityChecks failed")
 			return err
 		}
 
 		if err := archive.GetHandle().ImportJob(&jobMeta, &jobData); err != nil {
+			log.Error("Error while importing job")
 			return err
 		}
 
 		res, err := GetConnection().DB.NamedExec(NamedJobInsert, job)
 		if err != nil {
+			log.Error("Error while NamedJobInsert")
 			return err
 		}
 
 		id, err := res.LastInsertId()
 		if err != nil {
+			log.Error("Error while getting last insert ID")
 			return err
 		}
 
 		for _, tag := range job.Tags {
 			if _, err := GetJobRepository().AddTagOrCreate(id, tag.Type, tag.Name); err != nil {
+				log.Error("Error while adding or creating tag")
 				return err
 			}
 		}
@@ -201,6 +213,7 @@ func InitDB() error {
 	// Basic database structure:
 	_, err := db.DB.Exec(JobsDBSchema)
 	if err != nil {
+		log.Error("Error while initializing basic DB structure")
 		return err
 	}
 
@@ -208,11 +221,13 @@ func InitDB() error {
 	// that speeds up inserts A LOT.
 	tx, err := db.DB.Beginx()
 	if err != nil {
+		log.Error("Error while bundling transactions")
 		return err
 	}
 
 	stmt, err := tx.PrepareNamed(NamedJobInsert)
 	if err != nil {
+		log.Error("Error while preparing namedJobInsert")
 		return err
 	}
 	tags := make(map[string]int64)
@@ -232,12 +247,14 @@ func InitDB() error {
 		if i%10 == 0 {
 			if tx != nil {
 				if err := tx.Commit(); err != nil {
+					log.Error("Error while committing transactions for jobMeta")
 					return err
 				}
 			}
 
 			tx, err = db.DB.Beginx()
 			if err != nil {
+				log.Error("Error while bundling transactions for jobMeta")
 				return err
 			}
 
@@ -298,16 +315,19 @@ func InitDB() error {
 			if !ok {
 				res, err := tx.Exec(`INSERT INTO tag (tag_name, tag_type) VALUES (?, ?)`, tag.Name, tag.Type)
 				if err != nil {
+					log.Errorf("Error while inserting tag into tag table: %#v %#v", tag.Name, tag.Type)
 					return err
 				}
 				tagId, err = res.LastInsertId()
 				if err != nil {
+					log.Error("Error while getting last insert ID")
 					return err
 				}
 				tags[tagstr] = tagId
 			}
 
 			if _, err := tx.Exec(`INSERT INTO jobtag (job_id, tag_id) VALUES (?, ?)`, id, tagId); err != nil {
+				log.Errorf("Error while inserting jobtag into jobtag table: %#v %#v", id, tagId)
 				return err
 			}
 		}
@@ -322,12 +342,14 @@ func InitDB() error {
 	}
 
 	if err := tx.Commit(); err != nil {
+		log.Error("Error while committing SQL transactions")
 		return err
 	}
 
 	// Create indexes after inserts so that they do not
 	// need to be continually updated.
 	if _, err := db.DB.Exec(JobsDbIndexes); err != nil {
+		log.Error("Error while creating indices after inserts")
 		return err
 	}
 
@@ -341,6 +363,7 @@ func SanityChecks(job *schema.BaseJob) error {
 		return fmt.Errorf("no such cluster: %#v", job.Cluster)
 	}
 	if err := archive.AssignSubCluster(job); err != nil {
+		log.Error("Error while assigning subcluster to job")
 		return err
 	}
 	if !job.State.Valid() {
diff --git a/internal/repository/job.go b/internal/repository/job.go
index 0ade90b..202b678 100644
--- a/internal/repository/job.go
+++ b/internal/repository/job.go
@@ -68,10 +68,12 @@ func scanJob(row interface{ Scan(...interface{}) error }) (*schema.Job, error) {
 		&job.ID, &job.JobID, &job.User, &job.Project, &job.Cluster, &job.SubCluster, &job.StartTimeUnix, &job.Partition, &job.ArrayJobId,
 		&job.NumNodes, &job.NumHWThreads, &job.NumAcc, &job.Exclusive, &job.MonitoringStatus, &job.SMT, &job.State,
 		&job.Duration, &job.Walltime, &job.RawResources /*&job.MetaData*/); err != nil {
+		log.Error("Error while scanning rows")
 		return nil, err
 	}
 
 	if err := json.Unmarshal(job.RawResources, &job.Resources); err != nil {
+		log.Error("Error while unmarhsaling raw resources json")
 		return nil, err
 	}
 
@@ -93,6 +95,7 @@ func (r *JobRepository) FetchMetadata(job *schema.Job) (map[string]string, error
 
 	if err := sq.Select("job.meta_data").From("job").Where("job.id = ?", job.ID).
 		RunWith(r.stmtCache).QueryRow().Scan(&job.RawMetaData); err != nil {
+		log.Error("Error while scanning for job metadata")
 		return nil, err
 	}
 
@@ -101,6 +104,7 @@ func (r *JobRepository) FetchMetadata(job *schema.Job) (map[string]string, error
 	}
 
 	if err := json.Unmarshal(job.RawMetaData, &job.MetaData); err != nil {
+		log.Error("Error while unmarshaling raw metadata json")
 		return nil, err
 	}
 
@@ -113,6 +117,7 @@ func (r *JobRepository) UpdateMetadata(job *schema.Job, key, val string) (err er
 	r.cache.Del(cachekey)
 	if job.MetaData == nil {
 		if _, err = r.FetchMetadata(job); err != nil {
+			log.Errorf("Error while fetching metadata for job, DB ID '%#v'", job.ID)
 			return err
 		}
 	}
@@ -129,10 +134,12 @@ func (r *JobRepository) UpdateMetadata(job *schema.Job, key, val string) (err er
 	}
 
 	if job.RawMetaData, err = json.Marshal(job.MetaData); err != nil {
+		log.Errorf("Error while marshaling metadata for job, DB ID '%#v'", job.ID)
 		return err
 	}
 
 	if _, err = sq.Update("job").Set("meta_data", job.RawMetaData).Where("job.id = ?", job.ID).RunWith(r.stmtCache).Exec(); err != nil {
+		log.Errorf("Error while updating metadata for job, DB ID '%#v'", job.ID)
 		return err
 	}
 
@@ -185,6 +192,7 @@ func (r *JobRepository) FindAll(
 
 	rows, err := q.RunWith(r.stmtCache).Query()
 	if err != nil {
+		log.Error("Error while running query")
 		return nil, err
 	}
 
@@ -192,6 +200,7 @@ func (r *JobRepository) FindAll(
 	for rows.Next() {
 		job, err := scanJob(rows)
 		if err != nil {
+			log.Error("Error while scanning rows")
 			return nil, err
 		}
 		jobs = append(jobs, job)
@@ -259,7 +268,7 @@ func (r *JobRepository) DeleteJobsBefore(startTime int64) (int, error) {
 	err := r.DB.Get(&cnt, qs) //ignore error as it will also occur in delete statement
 	_, err = r.DB.Exec(`DELETE FROM job WHERE job.start_time < ?`, startTime)
 	if err != nil {
-		log.Warnf(" DeleteJobsBefore(%d): error %v", startTime, err)
+		log.Errorf(" DeleteJobsBefore(%d): error %#v", startTime, err)
 	} else {
 		log.Infof("DeleteJobsBefore(%d): Deleted %d jobs", startTime, cnt)
 	}
@@ -269,7 +278,7 @@ func (r *JobRepository) DeleteJobsBefore(startTime int64) (int, error) {
 func (r *JobRepository) DeleteJobById(id int64) error {
 	_, err := r.DB.Exec(`DELETE FROM job WHERE job.id = ?`, id)
 	if err != nil {
-		log.Warnf("DeleteJobById(%d): error %v", id, err)
+		log.Errorf("DeleteJobById(%d): error %#v", id, err)
 	} else {
 		log.Infof("DeleteJobById(%d): Success", id)
 	}
@@ -293,7 +302,7 @@ func (r *JobRepository) CountGroupedJobs(ctx context.Context, aggreg model.Aggre
 			count = fmt.Sprintf(`sum(job.num_nodes * (CASE WHEN job.job_state = "running" THEN %d - job.start_time ELSE job.duration END)) as count`, now)
 			runner = r.DB
 		default:
-			log.Notef("CountGroupedJobs() Weight %v unknown.", *weight)
+			log.Notef("CountGroupedJobs() Weight %#v unknown.", *weight)
 		}
 	}
 
@@ -309,6 +318,7 @@ func (r *JobRepository) CountGroupedJobs(ctx context.Context, aggreg model.Aggre
 	counts := map[string]int{}
 	rows, err := q.RunWith(runner).Query()
 	if err != nil {
+		log.Error("Error while running query")
 		return nil, err
 	}
 
@@ -316,6 +326,7 @@ func (r *JobRepository) CountGroupedJobs(ctx context.Context, aggreg model.Aggre
 		var group string
 		var count int
 		if err := rows.Scan(&group, &count); err != nil {
+			log.Error("Error while scanning rows")
 			return nil, err
 		}
 
@@ -359,11 +370,12 @@ func (r *JobRepository) MarkArchived(
 		case "file_bw":
 			stmt = stmt.Set("file_bw_avg", stats.Avg)
 		default:
-			log.Notef("MarkArchived() Metric %s unknown.", metric)
+			log.Notef("MarkArchived() Metric '%#v' unknown", metric)
 		}
 	}
 
 	if _, err := stmt.RunWith(r.stmtCache).Exec(); err != nil {
+		log.Error("Error while marking job as archived")
 		return err
 	}
 	return nil
@@ -478,6 +490,7 @@ func (r *JobRepository) AllocatedNodes(cluster string) (map[string]map[string]in
 		Where("job.cluster = ?", cluster).
 		RunWith(r.stmtCache).Query()
 	if err != nil {
+		log.Error("Error while running query")
 		return nil, err
 	}
 
@@ -488,9 +501,11 @@ func (r *JobRepository) AllocatedNodes(cluster string) (map[string]map[string]in
 		var resources []*schema.Resource
 		var subcluster string
 		if err := rows.Scan(&raw, &subcluster); err != nil {
+			log.Error("Error while scanning rows")
 			return nil, err
 		}
 		if err := json.Unmarshal(raw, &resources); err != nil {
+			log.Error("Error while unmarshaling raw resources json")
 			return nil, err
 		}
 
@@ -518,16 +533,18 @@ func (r *JobRepository) StopJobsExceedingWalltimeBy(seconds int) error {
 		Where(fmt.Sprintf("(%d - job.start_time) > (job.walltime + %d)", time.Now().Unix(), seconds)).
 		RunWith(r.DB).Exec()
 	if err != nil {
+		log.Error("Error while stopping jobs exceeding walltime")
 		return err
 	}
 
 	rowsAffected, err := res.RowsAffected()
 	if err != nil {
+		log.Error("Error while fetching affected rows after stopping due to exceeded walltime")
 		return err
 	}
 
 	if rowsAffected > 0 {
-		log.Warnf("%d jobs have been marked as failed due to running too long", rowsAffected)
+		log.Notef("%d jobs have been marked as failed due to running too long", rowsAffected)
 	}
 	return nil
 }
diff --git a/internal/repository/query.go b/internal/repository/query.go
index 9b86c59..f98b702 100644
--- a/internal/repository/query.go
+++ b/internal/repository/query.go
@@ -51,12 +51,14 @@ func (r *JobRepository) QueryJobs(
 
 	sql, args, err := query.ToSql()
 	if err != nil {
+		log.Error("Error while converting query to sql")
 		return nil, err
 	}
 
 	log.Debugf("SQL query: `%s`, args: %#v", sql, args)
 	rows, err := query.RunWith(r.stmtCache).Query()
 	if err != nil {
+		log.Error("Error while running query")
 		return nil, err
 	}
 
@@ -65,6 +67,7 @@ func (r *JobRepository) QueryJobs(
 		job, err := scanJob(rows)
 		if err != nil {
 			rows.Close()
+			log.Error("Error while scanning rows")
 			return nil, err
 		}
 		jobs = append(jobs, job)
diff --git a/internal/repository/tags.go b/internal/repository/tags.go
index 07c9910..6ab92e5 100644
--- a/internal/repository/tags.go
+++ b/internal/repository/tags.go
@@ -7,22 +7,26 @@ package repository
 import (
 	"github.com/ClusterCockpit/cc-backend/pkg/archive"
 	"github.com/ClusterCockpit/cc-backend/pkg/schema"
+	"github.com/ClusterCockpit/cc-backend/pkg/log"
 	sq "github.com/Masterminds/squirrel"
 )
 
 // Add the tag with id `tagId` to the job with the database id `jobId`.
 func (r *JobRepository) AddTag(job int64, tag int64) ([]*schema.Tag, error) {
 	if _, err := r.stmtCache.Exec(`INSERT INTO jobtag (job_id, tag_id) VALUES ($1, $2)`, job, tag); err != nil {
+		log.Error("Error while running query")
 		return nil, err
 	}
 
 	j, err := r.FindById(job)
 	if err != nil {
+		log.Error("Error while finding job by id")
 		return nil, err
 	}
 
 	tags, err := r.GetTags(&job)
 	if err != nil {
+		log.Error("Error while getting tags for job")
 		return nil, err
 	}
 
@@ -32,16 +36,19 @@ func (r *JobRepository) AddTag(job int64, tag int64) ([]*schema.Tag, error) {
 // Removes a tag from a job
 func (r *JobRepository) RemoveTag(job, tag int64) ([]*schema.Tag, error) {
 	if _, err := r.stmtCache.Exec("DELETE FROM jobtag WHERE jobtag.job_id = $1 AND jobtag.tag_id = $2", job, tag); err != nil {
+		log.Error("Error while running query")
 		return nil, err
 	}
 
 	j, err := r.FindById(job)
 	if err != nil {
+		log.Error("Error while finding job by id")
 		return nil, err
 	}
 
 	tags, err := r.GetTags(&job)
 	if err != nil {
+		log.Error("Error while getting tags for job")
 		return nil, err
 	}
 
@@ -138,6 +145,7 @@ func (r *JobRepository) GetTags(job *int64) ([]*schema.Tag, error) {
 
 	rows, err := q.RunWith(r.stmtCache).Query()
 	if err != nil {
+		log.Error("Error while running query")
 		return nil, err
 	}
 
@@ -145,6 +153,7 @@ func (r *JobRepository) GetTags(job *int64) ([]*schema.Tag, error) {
 	for rows.Next() {
 		tag := &schema.Tag{}
 		if err := rows.Scan(&tag.ID, &tag.Type, &tag.Name); err != nil {
+			log.Error("Error while scanning rows")
 			return nil, err
 		}
 		tags = append(tags, tag)
diff --git a/internal/repository/user.go b/internal/repository/user.go
index b96641a..01ecb32 100644
--- a/internal/repository/user.go
+++ b/internal/repository/user.go
@@ -6,13 +6,13 @@ package repository
 
 import (
 	"encoding/json"
-	"log"
 	"sync"
 	"time"
 
 	"github.com/ClusterCockpit/cc-backend/internal/auth"
 	"github.com/ClusterCockpit/cc-backend/internal/config"
 	"github.com/ClusterCockpit/cc-backend/pkg/lrucache"
+	"github.com/ClusterCockpit/cc-backend/pkg/log"
 	"github.com/jmoiron/sqlx"
 )
 
@@ -82,6 +82,7 @@ func (uCfg *UserCfgRepo) GetUIConfig(user *auth.User) (map[string]interface{}, e
 
 		rows, err := uCfg.Lookup.Query(user.Username)
 		if err != nil {
+			log.Errorf("Error while looking up user config for user '%#v'", user.Username)
 			return err, 0, 0
 		}
 
@@ -90,11 +91,13 @@ func (uCfg *UserCfgRepo) GetUIConfig(user *auth.User) (map[string]interface{}, e
 		for rows.Next() {
 			var key, rawval string
 			if err := rows.Scan(&key, &rawval); err != nil {
+				log.Error("Error while scanning user config values")
 				return err, 0, 0
 			}
 
 			var val interface{}
 			if err := json.Unmarshal([]byte(rawval), &val); err != nil {
+				log.Error("Error while unmarshaling raw user config json")
 				return err, 0, 0
 			}
 
@@ -106,6 +109,7 @@ func (uCfg *UserCfgRepo) GetUIConfig(user *auth.User) (map[string]interface{}, e
 		return config, 24 * time.Hour, size
 	})
 	if err, ok := data.(error); ok {
+		log.Error("Error in data set")
 		return nil, err
 	}
 
@@ -122,6 +126,7 @@ func (uCfg *UserCfgRepo) UpdateConfig(
 	if user == nil {
 		var val interface{}
 		if err := json.Unmarshal([]byte(value), &val); err != nil {
+			log.Error("Error while unmarshaling raw user config json")
 			return err
 		}
 
@@ -133,6 +138,7 @@ func (uCfg *UserCfgRepo) UpdateConfig(
 
 	if _, err := uCfg.DB.Exec(`REPLACE INTO configuration (username, confkey, value) VALUES (?, ?, ?)`,
 		user, key, value); err != nil {
+		log.Errorf("Error while replacing user config in DB for user '$#v'", user)
 		return err
 	}
 
diff --git a/internal/runtimeEnv/setup.go b/internal/runtimeEnv/setup.go
index a4d37be..2d0fc61 100644
--- a/internal/runtimeEnv/setup.go
+++ b/internal/runtimeEnv/setup.go
@@ -14,6 +14,8 @@ import (
 	"strconv"
 	"strings"
 	"syscall"
+
+	"github.com/ClusterCockpit/cc-backend/pkg/log"
 )
 
 // Very simple and limited .env file reader.
@@ -22,6 +24,7 @@ import (
 func LoadEnv(file string) error {
 	f, err := os.Open(file)
 	if err != nil {
+		log.Error("Error while opening file")
 		return err
 	}
 
@@ -89,11 +92,13 @@ func DropPrivileges(username string, group string) error {
 	if group != "" {
 		g, err := user.LookupGroup(group)
 		if err != nil {
+			log.Error("Error while looking up group")
 			return err
 		}
 
 		gid, _ := strconv.Atoi(g.Gid)
 		if err := syscall.Setgid(gid); err != nil {
+			log.Error("Error while setting gid")
 			return err
 		}
 	}
@@ -101,11 +106,13 @@ func DropPrivileges(username string, group string) error {
 	if username != "" {
 		u, err := user.Lookup(username)
 		if err != nil {
+			log.Error("Error while looking up user")
 			return err
 		}
 
 		uid, _ := strconv.Atoi(u.Uid)
 		if err := syscall.Setuid(uid); err != nil {
+			log.Error("Error while setting uid")
 			return err
 		}
 	}
diff --git a/pkg/archive/archive.go b/pkg/archive/archive.go
index f0a7027..051cc8b 100644
--- a/pkg/archive/archive.go
+++ b/pkg/archive/archive.go
@@ -10,6 +10,7 @@ import (
 
 	"github.com/ClusterCockpit/cc-backend/pkg/lrucache"
 	"github.com/ClusterCockpit/cc-backend/pkg/schema"
+	"github.com/ClusterCockpit/cc-backend/pkg/log"
 )
 
 type ArchiveBackend interface {
@@ -40,6 +41,7 @@ func Init(rawConfig json.RawMessage, disableArchive bool) error {
 		Kind string `json:"kind"`
 	}
 	if err := json.Unmarshal(rawConfig, &kind); err != nil {
+		log.Error("Error while unmarshaling raw config json")
 		return err
 	}
 
@@ -53,6 +55,7 @@ func Init(rawConfig json.RawMessage, disableArchive bool) error {
 	}
 
 	if err := ar.Init(rawConfig); err != nil {
+		log.Error("Error while initializing archiveBackend")
 		return err
 	}
 	return initClusterConfig()
@@ -70,6 +73,7 @@ func LoadAveragesFromArchive(
 
 	metaFile, err := ar.LoadJobMeta(job)
 	if err != nil {
+		log.Error("Error while loading job metadata from archiveBackend")
 		return err
 	}
 
@@ -88,6 +92,7 @@ func GetStatistics(job *schema.Job) (map[string]schema.JobStatistics, error) {
 
 	metaFile, err := ar.LoadJobMeta(job)
 	if err != nil {
+		log.Error("Error while loading job metadata from archiveBackend")
 		return nil, err
 	}
 
@@ -104,6 +109,7 @@ func UpdateTags(job *schema.Job, tags []*schema.Tag) error {
 
 	jobMeta, err := ar.LoadJobMeta(job)
 	if err != nil {
+		log.Error("Error while loading job metadata from archiveBackend")
 		return err
 	}
 
diff --git a/pkg/archive/clusterConfig.go b/pkg/archive/clusterConfig.go
index 317dfb7..86635cc 100644
--- a/pkg/archive/clusterConfig.go
+++ b/pkg/archive/clusterConfig.go
@@ -9,6 +9,7 @@ import (
 	"fmt"
 
 	"github.com/ClusterCockpit/cc-backend/pkg/schema"
+	"github.com/ClusterCockpit/cc-backend/pkg/log"
 )
 
 var Clusters []*schema.Cluster
@@ -23,6 +24,7 @@ func initClusterConfig() error {
 
 		cluster, err := ar.LoadClusterCfg(c)
 		if err != nil {
+			log.Errorf("Error while loading cluster config for cluster '%#v'", c)
 			return err
 		}
 
diff --git a/pkg/archive/fsBackend.go b/pkg/archive/fsBackend.go
index 608573d..1e363bb 100644
--- a/pkg/archive/fsBackend.go
+++ b/pkg/archive/fsBackend.go
@@ -46,7 +46,7 @@ func loadJobMeta(filename string) (*schema.JobMeta, error) {
 
 	f, err := os.Open(filename)
 	if err != nil {
-		log.Errorf("loadJobMeta() > open file error: %v", err)
+		log.Errorf("loadJobMeta() > open file error: %#v", err)
 		return &schema.JobMeta{}, err
 	}
 	defer f.Close()
@@ -58,19 +58,19 @@ func (fsa *FsArchive) Init(rawConfig json.RawMessage) error {
 
 	var config FsArchiveConfig
 	if err := json.Unmarshal(rawConfig, &config); err != nil {
-		log.Errorf("Init() > Unmarshal error: %v", err)
+		log.Errorf("Init() > Unmarshal error: %#v", err)
 		return err
 	}
 	if config.Path == "" {
 		err := fmt.Errorf("ARCHIVE/FSBACKEND > Init() : empty config.Path")
-		log.Errorf("Init() > config.Path error: %v", err)
+		log.Errorf("Init() > config.Path error: %#v", err)
 		return err
 	}
 	fsa.path = config.Path
 
 	entries, err := os.ReadDir(fsa.path)
 	if err != nil {
-		log.Errorf("Init() > ReadDir() error: %v", err)
+		log.Errorf("Init() > ReadDir() error: %#v", err)
 		return err
 	}
 
@@ -86,7 +86,7 @@ func (fsa *FsArchive) LoadJobData(job *schema.Job) (schema.JobData, error) {
 	filename := getPath(job, fsa.path, "data.json")
 	f, err := os.Open(filename)
 	if err != nil {
-		log.Errorf("LoadJobData() > open file error: %v", err)
+		log.Errorf("LoadJobData() > open file error: %#v", err)
 		return nil, err
 	}
 	defer f.Close()
@@ -175,12 +175,15 @@ func (fsa *FsArchive) StoreJobMeta(jobMeta *schema.JobMeta) error {
 	}
 	f, err := os.Create(getPath(&job, fsa.path, "meta.json"))
 	if err != nil {
+		log.Error("Error while creating filepath for meta.json")
 		return err
 	}
 	if err := EncodeJobMeta(f, jobMeta); err != nil {
+		log.Error("Error while encoding job metadata to meta.json file")
 		return err
 	}
 	if err := f.Close(); err != nil {
+		log.Error("Error while closing meta.json file")
 		return err
 	}
 
@@ -203,26 +206,38 @@ func (fsa *FsArchive) ImportJob(
 	}
 	dir := getPath(&job, fsa.path, "")
 	if err := os.MkdirAll(dir, 0777); err != nil {
+		log.Error("Error while creating job archive path")
 		return err
 	}
 
 	f, err := os.Create(path.Join(dir, "meta.json"))
 	if err != nil {
+		log.Error("Error while creating filepath for meta.json")
 		return err
 	}
 	if err := EncodeJobMeta(f, jobMeta); err != nil {
+		log.Error("Error while encoding job metadata to meta.json file")
 		return err
 	}
 	if err := f.Close(); err != nil {
+		log.Error("Error while closing meta.json file")
 		return err
 	}
 
 	f, err = os.Create(path.Join(dir, "data.json"))
 	if err != nil {
+		log.Error("Error while creating filepath for data.json")
 		return err
 	}
 	if err := EncodeJobData(f, jobData); err != nil {
+		log.Error("Error while encoding job metricdata to data.json file")
 		return err
 	}
-	return f.Close()
+	if err := f.Close(); err != nil {
+		log.Error("Error while closing data.json file")
+		return err
+	}
+	
+	// no error: final return is nil
+	return nil
 }
diff --git a/pkg/archive/json.go b/pkg/archive/json.go
index 69db584..0fd3bce 100644
--- a/pkg/archive/json.go
+++ b/pkg/archive/json.go
@@ -10,12 +10,14 @@ import (
 	"time"
 
 	"github.com/ClusterCockpit/cc-backend/pkg/schema"
+	"github.com/ClusterCockpit/cc-backend/pkg/log"
 )
 
 func DecodeJobData(r io.Reader, k string) (schema.JobData, error) {
 	data := cache.Get(k, func() (value interface{}, ttl time.Duration, size int) {
 		var d schema.JobData
 		if err := json.NewDecoder(r).Decode(&d); err != nil {
+			log.Error("Error while decoding raw job data json")
 			return err, 0, 1000
 		}
 
@@ -23,6 +25,7 @@ func DecodeJobData(r io.Reader, k string) (schema.JobData, error) {
 	})
 
 	if err, ok := data.(error); ok {
+		log.Error("Error in decoded job data set")
 		return nil, err
 	}
 
@@ -32,6 +35,7 @@ func DecodeJobData(r io.Reader, k string) (schema.JobData, error) {
 func DecodeJobMeta(r io.Reader) (*schema.JobMeta, error) {
 	var d schema.JobMeta
 	if err := json.NewDecoder(r).Decode(&d); err != nil {
+		log.Error("Error while decoding raw job meta json")
 		return &d, err
 	}
 
@@ -43,6 +47,7 @@ func DecodeJobMeta(r io.Reader) (*schema.JobMeta, error) {
 func DecodeCluster(r io.Reader) (*schema.Cluster, error) {
 	var c schema.Cluster
 	if err := json.NewDecoder(r).Decode(&c); err != nil {
+		log.Error("Error while decoding raw cluster json")
 		return &c, err
 	}
 
@@ -54,6 +59,7 @@ func DecodeCluster(r io.Reader) (*schema.Cluster, error) {
 func EncodeJobData(w io.Writer, d *schema.JobData) error {
 	// Sanitize parameters
 	if err := json.NewEncoder(w).Encode(d); err != nil {
+		log.Error("Error while encoding new job data json")
 		return err
 	}
 
@@ -63,6 +69,7 @@ func EncodeJobData(w io.Writer, d *schema.JobData) error {
 func EncodeJobMeta(w io.Writer, d *schema.JobMeta) error {
 	// Sanitize parameters
 	if err := json.NewEncoder(w).Encode(d); err != nil {
+		log.Error("Error while encoding new job meta json")
 		return err
 	}
 
diff --git a/pkg/schema/float.go b/pkg/schema/float.go
index df084fa..52197f2 100644
--- a/pkg/schema/float.go
+++ b/pkg/schema/float.go
@@ -9,6 +9,8 @@ import (
 	"io"
 	"math"
 	"strconv"
+
+	"github.com/ClusterCockpit/cc-backend/pkg/log"
 )
 
 // A custom float type is used so that (Un)MarshalJSON and
@@ -43,6 +45,7 @@ func (f *Float) UnmarshalJSON(input []byte) error {
 
 	val, err := strconv.ParseFloat(s, 64)
 	if err != nil {
+		log.Error("Error while parsing custom float")
 		return err
 	}
 	*f = Float(val)
diff --git a/pkg/schema/validate.go b/pkg/schema/validate.go
index b3eee6e..dafe892 100644
--- a/pkg/schema/validate.go
+++ b/pkg/schema/validate.go
@@ -45,16 +45,17 @@ func Validate(k Kind, r io.Reader) (err error) {
 	case Config:
 		s, err = jsonschema.Compile("embedfs://config.schema.json")
 	default:
-		return fmt.Errorf("SCHEMA/VALIDATE > unkown schema kind: %v", k)
+		return fmt.Errorf("SCHEMA/VALIDATE > unkown schema kind: %#v", k)
 	}
 
 	if err != nil {
+		log.Errorf("Error while compiling json schema for kind '%#v'", k)
 		return err
 	}
 
 	var v interface{}
 	if err := json.NewDecoder(r).Decode(&v); err != nil {
-		log.Errorf("Failed to decode %v", err)
+		log.Errorf("Error while decoding raw json schema: %#v", err)
 		return err
 	}