Redis API notes

void setKey(redisDb *db, robj *key, robj *val) {
    if (lookupKeyWrite(db,key) == NULL) {
        dbAdd(db,key,val);
    } else {
        dbOverwrite(db,key,val);
    }

    incrRefCount(val);
    removeExpire(db,key);
    signalModifiedKey(db,key);
}