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CSV file(s)? It's not like the underlying data is in any way complicated. A lot of software can export and import these.

Those that can't export to CSV have usually another way of getting that data into a spreadsheet application, from where you can export it as CSV...

And yes I know CSV technically sucks (varying encoding, lax standards, etc.), but it's the lowest common denominator for a lot of software.

SqLite is the solution to all our CSV problems.

There is OFX format: https://en.m.wikipedia.org/wiki/Open_Financial_Exchange

Or as someone posted here on HN a while ago - sqlite?

Too far down the stack. It may be the OP's data was already in sqlite but that doesn't help even if the next application uses sqlite because the schema will be different.

Gnu cash