Changed endpoints and db queries, chart now shows suggested mins and maxes

Database.go

@@ -39,6 +39,27 @@ func writeSnapshotToDb(snapshotSub *SnapshotSubmission) error {
 	return nil
 }
 
+func getLastSnapshotRecordFromDb() (*SnapshotRecord, error) {
+	var snapshotRecord SnapshotRecord
+	query := "SELECT `%s`, `%s`, `%s`, `%s`, `%s` FROM `snapshots` ORDER BY `id` DESC LIMIT 1;"
+	rows, err := ClimateDb.Query(fmt.Sprintf(query, "id", "temp", "humidity", "co2", "time"))
+	if err != nil {
+		return nil, err
+	}
+	rows.Next()
+	err = rows.Scan(
+		&snapshotRecord.Id,
+		&snapshotRecord.Temp,
+		&snapshotRecord.Humidity,
+		&snapshotRecord.Co2,
+		&snapshotRecord.Timestamp,
+	)
+	if err != nil {
+		return nil, err
+	}
+	return &snapshotRecord, nil
+}
+
 func getSnapshotRecordsFromDb(minuteAgo int) ([]*SnapshotRecord, error) {
 	snapshots := make([]*SnapshotRecord, 0)
 	query := "SELECT `%s`, `%s`, `%s`, `%s`, `%s` FROM `snapshots` WHERE `%s` > date_sub(now(), interval %v minute) ORDER BY `id` DESC;"