When inserting links multiple times, it's annoying to have to go back to the
original place the link points to and reinsert it into the stored link list.
Using a universal argument to toggle `org-link-keep-stored-after-insertion` is
also not an option, as I keep forgetting to use it.
Instead, by default keep all links after insertion. To be able to handle the
growing list of links, we now provide a function `db/org-clear-stored-links` to
set the list of stored links to the empty list.