Tracking operations performed on AnnData objects

When exploring various options of preprocessing data, I try to avoid having several copies of AnnData objects in memory if they're not sparse, so I save them to h5ad at key steps. Sometimes alas, after a few iterations I re-write stuff and forget what operations have been performed in my "X" (particularly in the preprocessing steps).

So, because being lazy makes me creative, I started tracking these in the object itself (see example https://gist.github.com/afrendeiro/7ccaf324bfdbff042ae36f734f544860) by decorating the preprocessing functions post hoc (this could even easily be used to save the values of kwargs passed potentially).

I wonder if an internal implementation of this would be of broad interest, particularly for functions which modify "X" inplace?
Of course this would be no replacement for proper documentation of one's steps, etc but I thought it could be an interesting addition to scanpy in any case.

Start by reviewing the linked gist and the AnnData preprocessing functions that modify X in place. Determine which operations and kwargs should be tracked, then inspect existing AnnData metadata and preprocessing tests for an appropriate integration point. Done would require an agreed scope, implementation, and tests covering the recorded operation history.