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They /tmp file mechanism sounds like a bit of a hack, is that definitely necessary?

It may be possible to create a SQLite in-memory database instead and then load the binary blob data into it using the backup API or some kind of trick with VACUUM INTO.

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I think the right approach would be to store the sqlite database as a varlena type that can be TOASTed and then "expanded" using the Expanded Datum API so that it's a live open database connection for the life of the transaction:

https://www.postgresql.org/docs/17/xtypes.html#XTYPES-TOAST

https://github.com/postgres/postgres/blob/master/src/include...

Thanks i will look into this more, /tmp stuff is most definitely a hack.

Here's an example of a simple expanded object to start from:

https://github.com/michelp/pgexpanded

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