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> database level lock

But that's not anywhere close to good enough.

> But that's not anywhere close to good enough for me

FTFY

> But that's not anywhere close to good enough for concurrent, multiuser systems with reasonable traffic.

FTFY

Mmhmm. Like I said, that's not good enough for you and for your needs. For other people it's fine. That's important to note.

At that point you might as well use a JSON file per database and lock the entire file, parse, change then serialise again. That might even be faster.