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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.
https://github.com/darcys22/godbledger
I love these command line self hosted accounting software packages. But double entry bookkeeping was invented using ledgerbooks with ruled tables. I feel the plain text dataformats are a regression compared to a sql database. A general ledger just works so well with columns that you can sum.
It also saves you from needing a custom tool like bean-query to replicate sqlite-ish queries because it could have been in a database from the start
If you're using Python, and you want to import transaction/balance data without handing over your passwords to some third party, you can try
https://github.com/csingley/ofxtools