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I'd like to have a single reservoir of RECIDs to apply across multiple tables.

Obviously I can do that by creating a table with a single auto-increment field and inserting every time I need a new RECID.

But that produces a lot of 8-byte+ records that have no real purpose.

A little resident function to delete each record when produced would keep the table pruned back, but I'm wondering whether there's a cleaner way to get to the same goal.

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You don't need a "reservoir", rather a way to generate a unique number.

Usually it is sufficient to give that task to one table you already have, and use AUTO_INCREMENT there, plus LAST_INSERT_ID().

But it you really need a sequence generator:

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