fix(pkg/logfile): use one instead of several logfiles for all measured values

pkg/types/measuredValue.go

@@ -1,7 +1,13 @@
 package types
 
+import "time"
+
 type MeasuredValue interface {
 	GetID() string
+	GetCreationDate() *time.Time
 	GetSensorID() string
 	GetValue() float64
+	SetCreationDate(date *time.Time)
+	SetTillDate(date time.Time)
+	SetUpdateDate(date *time.Time)
 }