The submit button doesn't generate an event you can subscribe to. Each element has its own change monitoring via the <change> tag. The Submit button just triggers change actions for any inputs that have changed and are not already set to "search on change" You could create search that runs whenever ANY of the form tokens change that sets a new token with the last change time. <search>
<query>
| makeresults
| eval last_update_ts=now()
```$TOKEN1$ $TOKEN2$ $TOKEN3$ $TOKEN4$```
</query>
<earliest>-1m</earliest>
<latest>now</latest>
<sampleRatio>1</sampleRatio>
<done>
<set token="last_update_ts">$result.last_update_ts$</set>
</done>
</search> That same search COULD actually output to your lookup table using "last_update_ts" as the time field
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