little-bank
Little Bank is a framework for analyzing financial transactions.
Design goals
- All analysis should be a matter of summarizing credit, debit or balance of an account in a system. The intention is to reduce bugs by making all analysis use the same numerical implementation.
- This means that we're of the opinion that implementing filters and doing arithmetic on transactions outside of little-bank code is wrong. If we find ourselves grasping to do this, what we should instead do is introduce new accounts our possibly restructure the flow between the existing ones.
- Allow defining rules for a system in a declarative way.
- Disallow mutation. The design encourages immutable, append-only transactions.
- All operations that update the system are very similar: appending transactions which automatically verifies all defined rules, and persisting the new transactions. This allows centralizing code that saves transactions to a single place.
Non-goals
- Performance. This library is intended to be used to analyze systems of a small number of transactions. Therefor exposing APIs that are easy to reason about is a much higher priority than performance.
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