Understood the complications that we get.
My idea:
Is it possible to create/add tag automatically to an entry when there is strava/other data for each date and this tag can appear in search page filter and then corresponding entries in the results.
I don’t mind if the data gets deleted in strava but diarium keeps that entries without strava data along with the tag.
But others may not agree with this.
Just a thought. Please ignore, if it doesn’t make sense.