Added start of editable dashboard

datapoint.go

@@ -30,11 +30,32 @@ type Datapoint struct {
 	LastValue            time.Time `db:"last_value"`
 	DatapointValueJSON   []byte    `db:"datapoint_value_json"`
 	LastDatapointValue   DatapointValue
+	LastDatapointID      *int       `db:"last_value_id"`
+	LastValueInt         *int       `db:"last_value_int"`
+	LastValueString      *string    `db:"last_value_string"`
+	LastValueDateTime    *time.Time `db:"last_value_datetime"`
 	Found                bool
 	NodataProblemSeconds int  `db:"nodata_problem_seconds"`
 	NodataIsProblem      bool `db:"nodata_is_problem"`
 }
 
+type DatapointBrief struct {
+	ID                int
+	Name              string
+	Comment           string
+	Datatype          DatapointType
+	LastValueInt      *int       `db:"last_value_int"`
+	LastValueString   *string    `db:"last_value_string"`
+	LastValueDateTime *time.Time `db:"last_value_datetime"`
+	NodataIsProblem   bool       `db:"nodata_is_problem"`
+}
+
+type DatapointTiny struct {
+	ID    int
+	Value any
+	Valid bool
+}
+
 type DatapointValue struct {
 	ID            int
 	DatapointID   int `db:"datapoint_id"`
@@ -370,3 +391,53 @@ func DatapointValues(id int, from, to time.Time) (values []DatapointValue, err e
 
 	return
 } // }}}
+
+// DatapointsValue only returns ID and type and is used primarily for the dashboard.
+func DatapointsValue(ids []int) (values []DatapointTiny, err error) { // {{{
+	values = []DatapointTiny{}
+
+	rows, _ := db.Query(
+		context.Background(),
+		`
+		SELECT
+			id,
+			name,
+			comment,
+			datatype,
+			last_value_int,
+			last_value_string,
+			last_value_datetime,
+			nodata_is_problem
+		FROM datapoint
+		WHERE
+			id = ANY($1)
+		`,
+		ids,
+	)
+
+	var briefs []DatapointBrief
+	briefs, err = pgx.CollectRows(rows, pgx.RowToStructByNameLax[DatapointBrief])
+	if err != nil {
+		err = werr.Wrap(err)
+		return
+	}
+
+	for _, brief := range briefs {
+		tiny := DatapointTiny{}
+		tiny.ID = brief.ID
+		tiny.Valid = !brief.NodataIsProblem
+
+		switch brief.Datatype {
+		case "INT":
+			tiny.Value = brief.LastValueInt
+		case "STRING":
+			tiny.Value = brief.LastValueString
+		case "DATETIME":
+			tiny.Value = brief.LastValueDateTime
+		}
+
+		values = append(values, tiny)
+	}
+
+	return
+} // }}}