Hi,

We are trying to use the 'sequence' generator type for IDs in PostgreSQL but the columns are created as bigint and there appears to be no way to generate the next ID in the sequence.

I guess this is only a problem since we have applications that are external to hibernate creating records.

Has anyone managed to work around this? Would creating our own sequence numbers interfere with a running Hibernate application?

No, you can create your own sequence. If the builtin identifier generators are not what you want, implement IdentifierGenerator yourself.