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Good scientific practice
You can find the most important rules and guidelines for safeguarding research integrity and good scientific practice here:
DFG Guidelines for Safeguarding Good Research Practice - Code of Conduct in English; DFG Leitlinien zur Sicherung guter wissenschaftlicher Praxis - Kodex in German
Satzung der Kommission zur Sicherung guter wissenschaftlicher Praxis der Universität zu Köln in German (statutes of the Commission for safeguarding good scientific practice at the University of Cologne - no English version is available yet, as per 27/04/2021)
Guideline on the Handling of Research Data at the University of Cologne in English; Leitlinie zum Umgang mit Forschungsdaten an der Universität zu Köln in German
University of Cologne - Research Code of Conduct in English; Universität zu Köln - Research Code of Conduct in German
These are some useful links to articles and documents regarding a good scientific practice. Maybe you can find something helpful.
Data Sets Are Foundational to Research. Why Don’t We Cite Them?