https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=33905

--- Comment #18 from David Cook <[email protected]> ---
(In reply to David Cook from comment #1)
> We have a lot of patrons whose userid and cardnumber are the same, so I'd
> want to preserve that.
> 
> But it does make sense to prevent a userid/cardnumber that belongs to the
> cardnumber/userid of another borrower...

You know... this problem would be simpler to solve via the schema if we
eliminated the requirement that 1 user's userid and cardnumber can be the same.

Because then we could just have a "borrower_identifiers" table with a unique
index on "value".

borrower_identifiers
`value`,`type`,`borrowernumber`
'42', 'cardnumber',51
'koha','userid',51
UNIQUE(value)

--

But... that would also be a big breaking change...

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