Never store two different types of information in the same table, even if the structure is identical. They may be identical today -- they won't be in two years

Never store two different types of information in the same table, even if the structure is identical. They may be identical today -- they won't be in two years time. If you're unsure about this, ask yourself if your table has a column called 'type' or something similar. If it does, a big migration awaits you a year or two down the road, and you'll have a lot of pain between now and then.