How to modify the cooldown of Hearthstone's teleportation?

I have modified the Hearthstone’s teleport cooldown in the Spell.dbc file, changing it from 1800000 to 900000, but the teleport cooldown time remains 30 minutes instead of becoming 15 minutes. How can I successfully change the cooldown? I’ve heard that changes need to be made on the client side as well. What modifications are needed on the client side?

As I understand it those dbc files on the server site are just the basis for the mysql initialization. So you should change the value there for the server side.

Or rebuild the database after your changes for the server to actually know about your changes.

And then find where the dbc is extracted from in the client and change it there for the client.

Untested, I am new to trinitycore. But that seemed to be what the setup did with the dbc files if I recall correctly.