Finally: sync FitBit and Google Fit at high time resolution!
I have been trying to figure out a way to sync the intra-day (i.e. high time resolution data) from FitBit to Google Fit (and other services/databases). I managed to stumble upon this awesome project: https://github.com/praveendath92/fitbit-googlefit
I installed it on a first gen. Raspberry Pi and set up a cron job to run every morning, after I have weighed my self, and to sync a few days back (since I might forget to sync the FitBit for a few days). It will always overwrite what has been written already, so don’t worry about syncing the same steps twice.
My next project is to modify the code to also sync to a local database (PostgreSQL, MariaDB or something)!