delete some Quests....[HELP]

anyone knows what is the best Method to delete all Quest over lvl 80 or better saying all "new Quests" so with Quests in Jangan Cave for lvl 80 ?

i need only the old Quests like 70-80cap not Quests in Jangan Cave and something like that

in Client-side too

use this query
update sro_vt_shard.._refquest set service=0 where level >80
aha btw you dont need to edit anything at your client