Using a SQLite DB per tenant is a good alternative to handle that: https://turso.tech/
https://news.ycombinator.com/item?id=38539595
Really, use some proven and mature tech for your data. Don't jump on every hype train. In case of SQLite self hosting is especially easy using https://litestream.io/.
Using a SQLite DB per tenant is a good alternative to handle that: https://turso.tech/