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)
Try Threema… Open source, Swiss based, audited. As you and your data are not the product of this company, it costs 5 bucks. Less than a Starbucks coffee, but I still have a hard time convincing my peers to switch. (Not affiliated with Threema, just a fan)
26 cantons (states, its a confederacy), four languages, many dialects. You could fit nearly 17 Switzerlands into Texas. (Not nearly as much if you press it flat first ;-) )
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).
I do not know Airtable too well, but n8n might have a connector for it. Then you could use the rest. good luck!