Inspired by osquery (https://osquery.io/), imagine a product that helped you connect your bank accounts, credit card accounts, Coinbase, etc., and let you run SQL queries across this data. For example:
-- How much do I spend on Amazon every month? SELECT * FROM debits WHERE source = 'Amazon' GROUP BY month;
You could create charts of these queries and create alerts based on thresholds, week over week changes, etc.