Sure, but try creating a list of maps with string keys and values that can be ints, strings, lists, or maps, or protos for that matter. I've recently been writ

Sure, but try creating a list of maps with string keys and values that can be ints, strings, lists, or maps, or protos for that matter. I've recently been writing quite a lot of unit tests for SQL, and the biggest pain point is setting up the state of your data, because SQL is just not an ergonomic language in which to do that. Mostly I've just ended up writing YAML describing the rows I want in a database (and I use proto fields in DBs so some nesting there), and using a utility that converts that can load that YAML as a table.