See the thread at https://moodle.org/mod/forum/discuss.php?d=279551, for a possible approach.
Itamar Tzadok
Posts made by Itamar Tzadok
Dataform module. There is a bit of a learning curve but some say that it is worth it. See for instance a story for a group peer review with file uploads at https://moodle.org/mod/forum/discuss.php?d=312329#p1250358. Discussion at the Dataform (plugin) forum.
If you mean updating custom profile fields from the Database activity,
then not possible. If you want to display custom profile fields in the
Database activity, not possible either. The latter used to be possible
in the Dataform module (pre-2.6), not possible now, but will return in
the not too far future.
If you proceed with a dataform activity for this requirement we can continue the discussion and look into details in the Dataform (plugin) forum.