While loading the database with some initial reference data (about 1GB), using one-off code that got fixed as I went along, I somehow managed to "lose" some PK values, because sequences do not roll back if accessed with nextval.

To simplify, it sounds like you're worried that a list of numbers with a gap (1, 2, 3, 7, 8, 9) won't sort as efficiently as a list without a gap (1, 2, 3, 4, 5, 6). I believe you don't need to worry about this, because a) it's not going to be an issue, and b) anyway, it's the database's problem.

It was at this point that I realised I needed DBIx::Class, otherwise I would have layers of raw SQL hiding in any homegrown DBMS/Perl framework and that had to be avoided at all costs.

Hmm. I don't understand how this follows from the issue of having gaps in your Primary Key values. DBIx::Class is a fine module, and I'm sure it will work well .. but having raw SQL code in your codebase isn't a terrible situation.

Looking forward to hearing about the launch! :)

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