I've done enough digging to know this involves self-joins, but I'm not sure 
how to combine everything.

I've got a table `mangos` with a column `pseudo_id` which I'd like to be as 
small a positive integer as possible.
When a `mango` is deleted we want to reuse its `pseudo_id` for a new 
`mango` as opposed to setting it
to something like `self.class.max(:pseudo_id).  We spun a few wheels trying 
to figure out how to do this
in Sequel; any tips?

Thanks,
Eric

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