Fidelio coupling

[cerealice]

Closes # (if applicable).

Changes proposed in this Pull Request

Checklist

• [ ] I tested my contribution locally and it works as intended.
• [ ] Code and workflow changes are sufficiently documented.
• [ ] Changed dependencies are added to envs/environment.yaml.
• [ ] Changes in configuration options are added in config/config.default.yaml.
• [ ] Changes in configuration options are documented in doc/configtables/*.csv.
• [ ] Sources of newly added data are documented in doc/data_sources.rst.
• [ ] A release note doc/release_notes.rst is added.