Why database factories like ExMachina become hard to maintain as association graphs grow, and why I moved test setup to business operations.

Deciding what counts as a successful response in a `handle_response/1` after `Tesla.get`, instead of inside the Tesla middleware chain, makes 5xx and malformed payloads look like successful requests to your telemetry.

Learn how to write dynamic Ecto queries efficiently with Composite, optimizing code organization and query composition for better performance and readability compared to traditional methods.