I have a working Flux query
data = from(bucket: "solaranzeige")
|> range(start: v.timeRangeStart, stop: v.timeRangeStop)
|> filter(fn: (r) => r["_measurement"] == "modbus.0.holdingRegisters.40074_Netz_Leistung")
|> filter(fn: (r) => r["_field"] == "value")
|> aggregateWindow(every: v.windowPeriod, fn: integral, createEmpty: false)
|> yield(name: "EinspeisungHeute")
|> filter(fn: (r) => r.value <= 0)
|> integral(unit: 1h)
the result is a negative number - What do I need to add to the query to get a positive number?