Rate-limit based on User-Agent String

i dont do iRules well from my mind but i feel there is something tricky with creating tables based on the time.

table set "Count_[HTTP::header User-Agent]_${epoch}" 1 indef $UAStimeout

doesnt that generate a new table like with every new request on a different time?

if i would trouble shoot this i'd add some log lines during the checking and creating of tables to see the values that are used and returned.