Can't give you a definitive answer. However I can tell you that you will have to "roll your own". AFAIK there are no off the shelf planes in this size. 15 cm is very little so you probably need a something with the largest possible wing area which would be a square. That will give you a wing area of 2.25 dm2. With commercially available equipment you can acheive a 20gram or less AUW (excluding payload). Mind you, that is with equipment that will give you decent range and duration. Add the 10 gram payload and you end up with a wingloading of 13.3 g/dm2 which should work ok. Take a look at this thread for starters - you might just be able to shrink the Drenalyn and make it work.
Can't help with the hard facts for the database - I'm more of a "that looks about right" kinda guy.
You could try and contact Matt Keenon who makes MAVs for a living.