You can try set spellcooldown_1 column
and set time to item for example set 15 sec cooldown to avoid spamable spawns.
- 1 means use default spell cooldown , 0 - no cooldown , and the 'value' in milliseconds will set the cooldown on item on use.
And note for the future, this column sets only on use cooldown, if you wanna set "internal cooldown" such as chance on hit trinkets this won't help you.
How i told just set time in milliseconds ant that's it :)