createdtells you when given the data (e.g. attachment to a form for the
last_modifiedtells you when the data was last changed.
usernametells you who did that change.
deletedtells you if the data is marked as deleted, and hence invisible to users.
last_modifiedhave the same value. Then, when this data is modified, another row is added:
createdis copied over and
last_modifiedis set to the current time stamp.
last_modifiedwhich is set to the current time stamp and
deletedwhich is set to