It may be possible to build an Irish lineup based on existing schedules, but I would need specifics on what channels you're able to receive in order to determine how many of the stations are available in the current database.
There is a lineup for Sky Ireland listed under the UK called "BSkyB - Eire (Ireland)", but it's missing all the Irish channels like RTE One, RTE2, RTEjr, RTE News Now, TV3, 3e, TG4, UTV Ireland, Oireachtas and Setanta Ireland.
If you want to add it manually, the ID is GBR-0001193-DEFAULT