The Flash: The Haunting of Barry Allen

This was an absolute delight to read. In the best way possible, this is a high quality officially sanctioned fanfic and I loved it. There were a few moments of eyebrow raise (why did Caitlin and Iris have an 80s movie style friend date, it was super weird), but everything else was pitch perfect for the show.
Since this is fan fiction basically...
What tags would this book receive in AO3? Probably Barry Hurt/comfort, Protective Ollie, worried Joe, OmG science, time paradox cancer?
For new comers to the show this is set in a time somewhere in the realm of season 2 flash though it's not clear exactly how it links up timeline wise. Most spoilers are for season 1 but it does talk about the big bag of season 2. No spoilers for season 3 or beyond.