Make it possible to reapprove failed BURs that removed aliases or
implications.
Before if a BUR failed midway through, and we tried to reapprove it,
then it would fail when it got to a `remove alias` line because the
alias had already been removed. Now we keep going if we try to remove an
alias or implication that has already been removed.
This directory contains library code used through Danbooru. This includes things like defining API clients, dealing with
sources, parsing tag searches, storing and resizing images, and so on.
Many of the files here use the Service Object pattern. Instead of putting complex code in models or controllers, it goes
here, in plain old Ruby objects (POROs). This keeps models and controllers simpler, and keeps domain logic isolated and
independent from the database and the HTTP request cycle.
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