Revert "Convey timestamps in written changesets"

This reverts commit beae0ec42ddec2befb7edac850adfd9de91e1bb3.

Planning to create a separate LiveDestination in order to write
revertable changeset files, as noted by @jimkonto.
Revert "Create database trigger to track resource changes"

This reverts commit ba3f454117930148228f9aac5d53ac3df064e619.

Will move the change tracking db-trigger to a separate file.
Separate SQL file for installing change tracking