We will walk through a concrete RAG example - a pipeline over a corporate annual report - and build the testing layer that most teams skip entirely. The code is real and runnable. The failures are not hypothetical.
Your Python tools need persistence. Here's how to add it without spinning up a database server, using TinyDB, a zero-dependency document store that lives in a single JSON file.
In this article we wire an INA219 power monitor to an ESP32-C3 Super Mini, charge an 18650 cell through a TP4056, and serve a live voltage/current/power dashboard directly from the device using Microdot.
If you've written a decorator before, you know the syntax. But let's slow down and look at what Python is actually doing, because that mental model is the key to understanding parametrized decorators later.
