Sort of. In server.h there's an enum type, so start at 0 and count up :)
enum {
CDB_MSGMAIN, /* message base */
CDB_USERS, /* user file */
CDB_ROOMS, /* room index */
CDB_FLOORTAB, /* floor index */
CDB_MSGLISTS, /* room message lists */
CDB_VISIT, /* user/room relationships */
CDB_DIRECTORY, /* address book directory */
CDB_USETABLE, /* network use table */
CDB_BIGMSGS, /* larger message bodies */
CDB_FULLTEXT, /* full text search index */
CDB_EUIDINDEX, /* locate msgs by EUID */
CDB_USERSBYNUMBER, /* index of users by number
*/
CDB_OPENID, /* associates OpenIDs with users */
CDB_CONFIG, /* system configuration database */
MAXCDB /* total number of CDB's defined */
};