Just make sure to have a redundant DB and make sure when you have accepted a tip, the DB storage of the tip is accepted as well by the DB. This also counts for the deliver part of the tip. I suggest you make the accept and deliver patch independent, that seems to work better int he workflow, and you can for instance accept more tips incoming then sending out in high load situations. But, such engineering requires more work. I come from an industry where most of the engineering effort went into solidifying the software then the actual features the user sees; Required for business critical system with availability figures of 5 9's.