diff --git a/datapoint.go b/datapoint.go
index 07346e8..f851a5b 100644
--- a/datapoint.go
+++ b/datapoint.go
@@ -21,14 +21,16 @@ const (
 )
 
 type Datapoint struct {
-	ID                 int
-	Group              string
-	Name               string
-	Datatype           DatapointType
-	LastValue          time.Time `db:"last_value"`
-	DatapointValueJSON []byte    `db:"datapoint_value_json"`
-	LastDatapointValue DatapointValue
-	Found              bool
+	ID                   int
+	Group                string
+	Name                 string
+	Datatype             DatapointType
+	LastValue            time.Time `db:"last_value"`
+	DatapointValueJSON   []byte    `db:"datapoint_value_json"`
+	LastDatapointValue   DatapointValue
+	Found                bool
+	NodataProblemSeconds int  `db:"nodata_problem_seconds"`
+	NodataIsProblem      bool `db:"nodata_is_problem"`
 }
 
 type DatapointValue struct {
@@ -56,13 +58,13 @@ func (dp DatapointValue) Value() any { // {{{
 
 	return nil
 } // }}}
-func (dp DatapointValue) FormattedTime() string {// {{{
+func (dp DatapointValue) FormattedTime() string { // {{{
 	if dp.ValueDateTime.Valid {
 		return dp.ValueDateTime.Time.Format("2006-01-02 15:04:05")
 	}
 	return "invalid time"
-}// }}}
-func (dp Datapoint) Update() (err error) {// {{{
+} // }}}
+func (dp Datapoint) Update() (err error) { // {{{
 	name := strings.TrimSpace(dp.Name)
 	if name == "" {
 		err = errors.New("Name can't be empty")
@@ -71,23 +73,47 @@ func (dp Datapoint) Update() (err error) {// {{{
 
 	if dp.ID == 0 {
 		_, err = service.Db.Conn.Exec(
-			`INSERT INTO datapoint("group", name, datatype) VALUES($1, $2, $3)`,
+			`INSERT INTO datapoint("group", name, datatype) VALUES($1, $2, $3, $4)`,
 			dp.Group,
 			name,
 			dp.Datatype,
+			dp.NodataProblemSeconds,
 		)
 	} else {
+		/* Keep nodata_is_problem as is unless the nodata_problem_seconds is changed.
+		 * Otherwise unnecessary nodata problems could be notified when updating unrelated
+		 * datapoint properties. */
 		_, err = service.Db.Conn.Exec(
-			`UPDATE datapoint SET "group"=$2, name=$3, datatype=$4 WHERE id=$1`,
+			`
+			UPDATE datapoint
+			SET
+				"group"=$2,
+				name=$3,
+				datatype=$4,
+				nodata_problem_seconds=$5,
+				nodata_is_problem = (
+					CASE
+						WHEN $5 != nodata_problem_seconds THEN false
+					ELSE
+						nodata_is_problem
+					END
+				)
+			WHERE
+				id=$1
+			`,
 			dp.ID,
 			dp.Group,
 			name,
 			dp.Datatype,
+			dp.NodataProblemSeconds,
 		)
 	}
+	if err != nil {
+		err = werr.Wrap(err)
+	}
 
 	return
-}// }}}
+} // }}}
 
 func DatapointAdd[T any](name string, value T) (err error) { // {{{
 	row := service.Db.Conn.QueryRow(`SELECT id, datatype FROM datapoint WHERE name=$1`, name)
@@ -120,7 +146,7 @@ func DatapointAdd[T any](name string, value T) (err error) { // {{{
 		return
 	}
 
-	service.Db.Conn.Exec(`UPDATE datapoint SET last_value = NOW() WHERE name=$1`, name)
+	service.Db.Conn.Exec(`UPDATE datapoint SET last_value = NOW(), nodata_is_problem = false WHERE id=$1`, dpID)
 
 	return
 } // }}}
@@ -253,14 +279,14 @@ func DatapointRetrieve(id int, name string) (dp Datapoint, err error) { // {{{
 
 	return
 } // }}}
-func DatapointDelete(id int) (err error) {// {{{
+func DatapointDelete(id int) (err error) { // {{{
 	_, err = service.Db.Conn.Exec(`DELETE FROM datapoint WHERE id=$1`, id)
 	if err != nil {
 		err = werr.Wrap(err).WithData(id)
 	}
 	return
-}// }}}
-func DatapointValues(id int) (values []DatapointValue, err error) {// {{{
+} // }}}
+func DatapointValues(id int) (values []DatapointValue, err error) { // {{{
 	rows, err := service.Db.Conn.Queryx(`SELECT * FROM datapoint_value WHERE datapoint_id=$1 ORDER BY ts DESC LIMIT 500`, id)
 	if err != nil {
 		err = werr.Wrap(err).WithData(id)
@@ -278,4 +304,4 @@ func DatapointValues(id int) (values []DatapointValue, err error) {// {{{
 		values = append(values, dpv)
 	}
 	return
-}// }}}
+} // }}}
diff --git a/go.mod b/go.mod
index d8dc4da..32bf233 100644
--- a/go.mod
+++ b/go.mod
@@ -6,14 +6,14 @@ require (
 	git.gibonuddevalla.se/go/webservice v0.2.15
 	git.gibonuddevalla.se/go/wrappederror v0.3.4
 	github.com/expr-lang/expr v1.16.5
+	github.com/jmoiron/sqlx v1.3.5
+	github.com/lib/pq v1.10.9
 )
 
 require (
 	git.gibonuddevalla.se/go/dbschema v1.3.0 // indirect
 	github.com/google/uuid v1.5.0 // indirect
 	github.com/gorilla/websocket v1.5.1 // indirect
-	github.com/jmoiron/sqlx v1.3.5 // indirect
-	github.com/lib/pq v1.10.9 // indirect
 	golang.org/x/net v0.17.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
diff --git a/go.sum b/go.sum
index 26c1b8f..03a3465 100644
--- a/go.sum
+++ b/go.sum
@@ -1,7 +1,7 @@
 git.gibonuddevalla.se/go/dbschema v1.3.0 h1:HzFMR29tWfy/ibIjltTbIMI4inVktj/rh8bESALibgM=
 git.gibonuddevalla.se/go/dbschema v1.3.0/go.mod h1:BNw3q/574nXbGoeWyK+tLhRfggVkw2j2aXZzrBKC3ig=
-git.gibonuddevalla.se/go/webservice v0.2.12 h1:IcaIycmF7eO88RmFQkslHaKRWYxXdciVQXUAvJ36b4g=
-git.gibonuddevalla.se/go/webservice v0.2.12/go.mod h1:3uBS6nLbK9qbuGzDls8MZD5Xr9ORY1Srbj6v06BIhws=
+git.gibonuddevalla.se/go/webservice v0.2.15 h1:ECe63fRDSrg3RJcgYV2pG+WsAQLVG8wvfHennz7aHsY=
+git.gibonuddevalla.se/go/webservice v0.2.15/go.mod h1:3uBS6nLbK9qbuGzDls8MZD5Xr9ORY1Srbj6v06BIhws=
 git.gibonuddevalla.se/go/wrappederror v0.3.4 h1:dcKp9/+QrZSO3S4fVnq7yG2p7DUZVmlztBAb/OzoZNY=
 git.gibonuddevalla.se/go/wrappederror v0.3.4/go.mod h1:j4w320Hk1wvhOPjUaK4GgLvmtnjUUM5yVu6JFO1OCSc=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
diff --git a/main.go b/main.go
index ab88c7c..e40494a 100644
--- a/main.go
+++ b/main.go
@@ -140,6 +140,8 @@ func main() { // {{{
 	service.Register("/configuration", false, false, pageConfiguration)
 	service.Register("/entry/{datapoint}", false, false, entryDatapoint)
 
+	go nodataLoop()
+
 	err = service.Start()
 	if err != nil {
 		logger.Error("webserver", "error", werr.Wrap(err))
@@ -553,11 +555,15 @@ func pageDatapointUpdate(w http.ResponseWriter, r *http.Request, _ *session.T) {
 		return
 	}
 
+	var nodataSeconds int
+	nodataSeconds, _ = strconv.Atoi(r.FormValue("nodata_seconds"))
+
 	var dp Datapoint
 	dp.ID = id
 	dp.Group = r.FormValue("group")
 	dp.Name = r.FormValue("name")
 	dp.Datatype = DatapointType(r.FormValue("datatype"))
+	dp.NodataProblemSeconds = nodataSeconds
 	err = dp.Update()
 	if err != nil {
 		httpError(w, werr.Wrap(err).Log())
diff --git a/nodata.go b/nodata.go
new file mode 100644
index 0000000..b30a239
--- /dev/null
+++ b/nodata.go
@@ -0,0 +1,75 @@
+package main
+
+import (
+	// External
+	werr "git.gibonuddevalla.se/go/wrappederror"
+
+	// Standard
+	"database/sql"
+	"time"
+)
+
+// nodataLoop  checks if datapoint last_value is larger than the nodata_problem_seconds period and
+// marks them as problems. They are then notified.
+func nodataLoop() {
+	var ids []int
+	var err error
+
+	// TODO - should be configurable
+	ticker := time.NewTicker(time.Second * 5)
+	for {
+		<-ticker.C
+		ids, err = nodataDatapointIDs()
+		if err != nil {
+			err = werr.Wrap(err).Log()
+			logger.Error("nodata", "error", err)
+			continue
+		}
+
+		if len(ids) == 0 {
+			continue
+		}
+
+		logger.Info("nodata", "problem_ids", ids)
+	}
+}
+
+func nodataDatapointIDs() (ids []int, err error) {
+	ids = []int{}
+
+	var rows *sql.Rows
+	rows, err = service.Db.Conn.Query(`
+		UPDATE datapoint
+		SET
+			nodata_is_problem = true
+		FROM (
+			SELECT
+				id
+			FROM
+				datapoint
+			WHERE
+				NOT nodata_is_problem AND
+				extract(EPOCH from (NOW() - last_value))::int > nodata_problem_seconds
+			) AS subquery
+		WHERE
+			datapoint.id = subquery.id
+		RETURNING
+			datapoint.id
+
+	`)
+	if err != nil {
+		err = werr.Wrap(err)
+		return
+	}
+	defer rows.Close()
+
+	var id int
+	for rows.Next() {
+		if err = rows.Scan(&id); err != nil {
+			err = werr.Wrap(err)
+			return
+		}
+		ids = append(ids, id)
+	}
+	return
+}
diff --git a/sql/00014.sql b/sql/00014.sql
new file mode 100644
index 0000000..e31a5d5
--- /dev/null
+++ b/sql/00014.sql
@@ -0,0 +1,4 @@
+ALTER TABLE datapoint ADD COLUMN nodata_problem_seconds INT4 NOT NULL DEFAULT 0;
+ALTER TABLE datapoint ADD COLUMN nodata_is_problem BOOL NOT NULL DEFAULT false;
+
+CREATE INDEX datapoint_last_value_idx ON public.datapoint ("last_value");
diff --git a/static/css/datapoints.css b/static/css/datapoints.css
index 1963b13..8333e8e 100644
--- a/static/css/datapoints.css
+++ b/static/css/datapoints.css
@@ -19,7 +19,7 @@ body {
 }
 body {
   background: #282828;
-  font-family: "Roboto", sans-serif;
+  font-family: sans-serif;
   font-weight: 300;
   color: #d5c4a1;
   font-size: 11pt;
@@ -48,25 +48,16 @@ a:hover {
 b {
   font-weight: 500;
 }
-.roboto-light {
-  font-family: "Roboto", sans-serif;
-  font-weight: 300;
-  font-style: normal;
-}
-.roboto-medium {
-  font-family: "Roboto", sans-serif;
-  font-weight: 500;
-  font-style: normal;
-}
 input[type="text"],
 textarea,
 select {
-  font-family: "Roboto Mono", monospace;
+  font-family: monospace;
   background: #202020;
   color: #d5c4a1;
   padding: 4px 8px;
   border: none;
   font-size: 1em;
+  line-height: 1.5em;
 }
 button {
   background: #202020;
@@ -97,6 +88,16 @@ span.seconds {
 label {
   user-select: none;
 }
+.description {
+  border: 1px solid #737373;
+  color: #3f9da1;
+  background: #202020;
+  padding: 4px 8px;
+  margin-top: 8px;
+  white-space: nowrap;
+  width: min-content;
+  border-radius: 8px;
+}
 #datapoints {
   display: grid;
   grid-template-columns: repeat(5, min-content);
@@ -137,6 +138,7 @@ label {
 }
 .widgets .label {
   margin-top: 4px;
+  white-space: nowrap;
 }
 .widgets input[type="text"],
 .widgets textarea {
diff --git a/static/css/main.css b/static/css/main.css
index e24674f..c2dc070 100644
--- a/static/css/main.css
+++ b/static/css/main.css
@@ -19,7 +19,7 @@ body {
 }
 body {
   background: #282828;
-  font-family: "Roboto", sans-serif;
+  font-family: sans-serif;
   font-weight: 300;
   color: #d5c4a1;
   font-size: 11pt;
@@ -48,25 +48,16 @@ a:hover {
 b {
   font-weight: 500;
 }
-.roboto-light {
-  font-family: "Roboto", sans-serif;
-  font-weight: 300;
-  font-style: normal;
-}
-.roboto-medium {
-  font-family: "Roboto", sans-serif;
-  font-weight: 500;
-  font-style: normal;
-}
 input[type="text"],
 textarea,
 select {
-  font-family: "Roboto Mono", monospace;
+  font-family: monospace;
   background: #202020;
   color: #d5c4a1;
   padding: 4px 8px;
   border: none;
   font-size: 1em;
+  line-height: 1.5em;
 }
 button {
   background: #202020;
@@ -97,6 +88,16 @@ span.seconds {
 label {
   user-select: none;
 }
+.description {
+  border: 1px solid #737373;
+  color: #3f9da1;
+  background: #202020;
+  padding: 4px 8px;
+  margin-top: 8px;
+  white-space: nowrap;
+  width: min-content;
+  border-radius: 8px;
+}
 #layout {
   display: grid;
   grid-template-areas: "menu content";
diff --git a/static/css/problems.css b/static/css/problems.css
index 5b6316c..080965f 100644
--- a/static/css/problems.css
+++ b/static/css/problems.css
@@ -19,7 +19,7 @@ body {
 }
 body {
   background: #282828;
-  font-family: "Roboto", sans-serif;
+  font-family: sans-serif;
   font-weight: 300;
   color: #d5c4a1;
   font-size: 11pt;
@@ -48,25 +48,16 @@ a:hover {
 b {
   font-weight: 500;
 }
-.roboto-light {
-  font-family: "Roboto", sans-serif;
-  font-weight: 300;
-  font-style: normal;
-}
-.roboto-medium {
-  font-family: "Roboto", sans-serif;
-  font-weight: 500;
-  font-style: normal;
-}
 input[type="text"],
 textarea,
 select {
-  font-family: "Roboto Mono", monospace;
+  font-family: monospace;
   background: #202020;
   color: #d5c4a1;
   padding: 4px 8px;
   border: none;
   font-size: 1em;
+  line-height: 1.5em;
 }
 button {
   background: #202020;
@@ -97,6 +88,16 @@ span.seconds {
 label {
   user-select: none;
 }
+.description {
+  border: 1px solid #737373;
+  color: #3f9da1;
+  background: #202020;
+  padding: 4px 8px;
+  margin-top: 8px;
+  white-space: nowrap;
+  width: min-content;
+  border-radius: 8px;
+}
 #problems-list,
 #acknowledged-list {
   display: grid;
diff --git a/static/css/theme.css b/static/css/theme.css
index 68c59d9..104cf3d 100644
--- a/static/css/theme.css
+++ b/static/css/theme.css
@@ -19,7 +19,7 @@ body {
 }
 body {
   background: #282828;
-  font-family: "Roboto", sans-serif;
+  font-family: sans-serif;
   font-weight: 300;
   color: #d5c4a1;
   font-size: 11pt;
@@ -48,25 +48,16 @@ a:hover {
 b {
   font-weight: 500;
 }
-.roboto-light {
-  font-family: "Roboto", sans-serif;
-  font-weight: 300;
-  font-style: normal;
-}
-.roboto-medium {
-  font-family: "Roboto", sans-serif;
-  font-weight: 500;
-  font-style: normal;
-}
 input[type="text"],
 textarea,
 select {
-  font-family: "Roboto Mono", monospace;
+  font-family: monospace;
   background: #202020;
   color: #d5c4a1;
   padding: 4px 8px;
   border: none;
   font-size: 1em;
+  line-height: 1.5em;
 }
 button {
   background: #202020;
@@ -97,3 +88,13 @@ span.seconds {
 label {
   user-select: none;
 }
+.description {
+  border: 1px solid #737373;
+  color: #3f9da1;
+  background: #202020;
+  padding: 4px 8px;
+  margin-top: 8px;
+  white-space: nowrap;
+  width: min-content;
+  border-radius: 8px;
+}
diff --git a/static/css/trigger_edit.css b/static/css/trigger_edit.css
index 477f462..b2600b6 100644
--- a/static/css/trigger_edit.css
+++ b/static/css/trigger_edit.css
@@ -19,7 +19,7 @@ body {
 }
 body {
   background: #282828;
-  font-family: "Roboto", sans-serif;
+  font-family: sans-serif;
   font-weight: 300;
   color: #d5c4a1;
   font-size: 11pt;
@@ -48,25 +48,16 @@ a:hover {
 b {
   font-weight: 500;
 }
-.roboto-light {
-  font-family: "Roboto", sans-serif;
-  font-weight: 300;
-  font-style: normal;
-}
-.roboto-medium {
-  font-family: "Roboto", sans-serif;
-  font-weight: 500;
-  font-style: normal;
-}
 input[type="text"],
 textarea,
 select {
-  font-family: "Roboto Mono", monospace;
+  font-family: monospace;
   background: #202020;
   color: #d5c4a1;
   padding: 4px 8px;
   border: none;
   font-size: 1em;
+  line-height: 1.5em;
 }
 button {
   background: #202020;
@@ -97,6 +88,16 @@ span.seconds {
 label {
   user-select: none;
 }
+.description {
+  border: 1px solid #737373;
+  color: #3f9da1;
+  background: #202020;
+  padding: 4px 8px;
+  margin-top: 8px;
+  white-space: nowrap;
+  width: min-content;
+  border-radius: 8px;
+}
 .widgets {
   display: grid;
   grid-template-columns: min-content 1fr;
diff --git a/static/js/datapoint_edit.mjs b/static/js/datapoint_edit.mjs
index 611011c..dfe5e9c 100644
--- a/static/js/datapoint_edit.mjs
+++ b/static/js/datapoint_edit.mjs
@@ -1,7 +1,7 @@
 export class UI {
 	constructor() {
 		document.addEventListener('keydown', evt=>this.keyHandler(evt))
-		document.querySelector('input[name="name"]').focus()
+		document.querySelector('input[name="group"]').focus()
 	}
 	keyHandler(evt) {
 		if (!(evt.altKey && evt.shiftKey))
diff --git a/static/less/datapoints.less b/static/less/datapoints.less
index 26ee63d..770db5f 100644
--- a/static/less/datapoints.less
+++ b/static/less/datapoints.less
@@ -47,6 +47,7 @@
 
 	.label {
 		margin-top: 4px;
+		white-space: nowrap;
 	}
 
 	input[type="text"], textarea {
diff --git a/static/less/theme.less b/static/less/theme.less
index 513db5f..11ae2fc 100644
--- a/static/less/theme.less
+++ b/static/less/theme.less
@@ -44,7 +44,7 @@ body {
 
 body {
 	background: @bg1;
-	font-family: "Roboto", sans-serif;
+	font-family: sans-serif;
 	font-weight: 300;
 	color: @text1;
 	font-size: 11pt;
@@ -80,27 +80,16 @@ b {
 	font-weight: @bold;
 }
 
-.roboto-light {
-	font-family: "Roboto", sans-serif;
-	font-weight: 300;
-	font-style: normal;
-}
-
-.roboto-medium {
-	font-family: "Roboto", sans-serif;
-	font-weight: 500;
-	font-style: normal;
-}
-
 input[type="text"],
 textarea,
 select {
-	font-family: "Roboto Mono", monospace;
+	font-family: monospace;
 	background: @bg2;
 	color: @text1;
 	padding: 4px 8px;
 	border: none;
 	font-size: 1em;
+	line-height: 1.5em; // fix for chrome hiding underscores
 }
 
 button {
@@ -138,3 +127,14 @@ span.seconds {
 label {
 	user-select: none;
 }
+
+.description {
+	border: 1px solid .lighterOrDarker(@bg3, 25%)[@result];
+	color: @color4;
+	background: @bg2;
+	padding: 4px 8px;
+	margin-top: 8px;
+	white-space: nowrap;
+	width: min-content;
+	border-radius: 8px;
+}
diff --git a/views/pages/datapoint_edit.gotmpl b/views/pages/datapoint_edit.gotmpl
index 9e9ee66..9d65b50 100644
--- a/views/pages/datapoint_edit.gotmpl
+++ b/views/pages/datapoint_edit.gotmpl
@@ -25,6 +25,13 @@
 			</select>
 		</div>
 
+		<div class="label">No data<br>problem time<br>(seconds)</div>
+		<div>
+			<input type="text" name="nodata_seconds" value="{{ .Data.Datapoint.NodataProblemSeconds }}">
+			<div class="description">A problem is raised and notified if an entry isn't made within this time.</div>
+			<div class="description">Set to 0 to disable.</div>
+		</div>
+
 		<div></div>
 		<div class="action">
 			{{ if eq .Data.Datapoint.ID 0 }}
diff --git a/views/pages/datapoint_values.gotmpl b/views/pages/datapoint_values.gotmpl
index f568b95..fe4651c 100644
--- a/views/pages/datapoint_values.gotmpl
+++ b/views/pages/datapoint_values.gotmpl
@@ -2,19 +2,8 @@
 	{{ $version := .VERSION }}
 	<link rel="stylesheet" type="text/css" href="/css/{{ .VERSION }}/datapoints.css">
 
-	<script type="module"  defer>
-		import { DataGraph } from "/js/{{ .VERSION }}/datapoint_graph.mjs"
-		const graph = new DataGraph({{ .Data.Datapoint }})
-		graph.setData({{ .Data.Values }})
-		graph.render('chart')
-	</script>
-
 	{{ block "page_label" . }}{{end}}
 
-	<div>
-		<canvas id="chart"></canvas>
-	</div>
-
 	<div id="values">
 		{{ range .Data.Values }}
 		<div class="value">{{ format_time .Ts }}</div>