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Catima
Discontinued Catima, a Loyalty Card & Ticket Manager for Android [Moved to: https://github.com/CatimaLoyalty/Android]
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
>Data export has changed from “export all data via CSV” to “export CSV of the last 7 days” with anything else meaning “upgrade to PRO” which, by the way, costs EUR 0.99 monthly or EUR 8.99 per annum.
As a German, you can luckily still request your data using the GDPR. I'd suggest finding an alternative (preferably Open Source) app and giving them your export file to ask if they can add support to import this other format.
I am doing this with my app too, just supporting importing from other apps' GDPR-extracted data. An example: https://github.com/TheLastProject/Catima/issues/168