The problem with having two fun side projects:
Do I write the Strava integration for Tanzawa so I can get all of my running data (or lack thereof tbh) just so.Β 
Or do I write some billing/electricity tariff calculations / #OctopusEnergy API integrations, so I can show just how much my solar / battery is saving me each month....
I reckon Strava is more important/less like work code... We show estimated costs on our graphs...I bet I can use that instead of calculating things meself to start?