I do not know Airtable too well, but n8n might have a connector for it. Then you could use the rest. good luck!

I am using appsmith for the app, with a pgsql db. Then n8n to query pgsql with its JSON functions and finally sending it to apitemplate.io to generate a PDF from the JSON and a template. The PDF then goes into nextcloud. With apitemplate you get 50 executions a month for free, which is enough for my use case. Hope this helps. (The use case is an equipment maintenance tool for the SCBAs of our fire brigade, where I need reporting for proving that maintenance was carried out)

I am using Autosync to sync Obsidian between my mobile, a laptop and a tablet with the central point being Nextcloud. Running without any problems for ca. 3 months.

Years ago I consulted for a French company and analyzed their processes. Heavily depended on Excel. They all pronounced Excel Sheet as “Excel Shit”. All day long it was sentences like"…and then I make an Excel Shit here", “… then I give the Shit to my colleague”. It was glorious… (and technically they were right).