Presentation of the FAIRtracks project and the Omnipy Python library, part of a presentation series on "ELIXIR Interoperability stories" for the ELIXIR Interoperability Platform, in a meeting March 7, 2023. FAIRtracks is a metadata model and related service infrastructure developed to help FAIRify genomic annotation datasets. Omnipy was developed in the context of the FAIRtracks project as a means to develop scalable and maintainable metadata transformation flows. This presentation has a particular focus on Omnipy as it is a general Python library that is relevant for use in a range of contexts where there is a need for structured functionality for (meta)data wrangling and transformation.