Log changes in data collections.

Hello,

I’ve setup a database for my site which services customers with their passport and visa paperwork.

I have a data collection that’s read/write so the client or staff would update the data on a regular basis as papers get updated.

Now I would really like to log changes, so that we could prevent any dispute. So that means I would have a change log collection, which be fed a new row of data each time a change is submitted.

From the existing setup, the submit button has on a single target, so it seems that cannot be set a the button level. Are there other ways to do that though? Please help, as this is to be a key feature of my product.

Thanks a lot!