GUILTY... No ifs, ands, or buts about it... GUILTY.
You live there, you should know the school zones.
I live where I have to go through 2 school zones for each of the 2 ways I can take to go to work. I know the school zone times by heart.
Did you make a mistake? Yes. Was it an honest one? Only you know the true answer... all we can do is take your word for it and all the court can do is uphold the law.
Good luck on deferred adjudication or defensive driving. I for one would take the defensive driving and get the insurance discount.
RJ