These earlier notes and resources may be inspiring:

• Notes from first data modeling discussion at Wikimania 2019
• Notes from second data modeling discussion at Wikimania 2019
• Properties table - already contains some first ideas on data modeling
• Interesting Wikimedia Commons files collected because of their structured data modeling challenges

– SandraF (WMF) (talk) 06:42, 7 September 2019 (UTC)