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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.
Firefly is open source and free: https://firefly-iii.org
Unless they provide an API to gather info I wouldn't do it, and probably still not trough a 3rd party app. Personally I'm using beancount (text accounting) with fava for GUI https://github.com/beancount/fava because I don't want to be tied to some software I don't know will still work years from now. Having everything in a text file means I can always have access. I'm using an importer to do all the importing semi-automatic and I have a script that just puts all my bank transactions into one big excel for import use.