DB Theory in gicqd

gicqd (currently) uses 4 databases: a user information database (userinfo), a client database (client), a contact database (contact) and a message database (message). userinfo stores all relevant information about each user known to your server; for example, UIN, name, home page, etc. This database is persistant, in that it does not go away when your server exits (e.g., you kill it). The message database, which stores offline messages to the users of your server, is also persistant. The remaining two databases - client and contact - are not persistant; every time your server exits, gicqd will remove these databases. The client database holds information about all the connections currently thought to exist (i.e., every client has registered with the server and has been responding to pings). The contact database stores a list of expect and notify pairs; this information is scanned by the server every time someone changes status. For example, if UIN 100 "expects" UIN 10, then the vector <10, 100> will be stored in the contact database.