BUR #17439 has been approved by @nonamethanks.
create alias fairy_knight_gawain_(fate) -> barghest_(fate)
create alias tam_lin_gawain_(fate) -> barghest_(fate)
create alias fairy_knight_tristan_(fate) -> baobhan_sith_(fate)
create alias tam_lin_tristan_(fate) -> baobhan_sith_(fate)
create alias fairy_knight_lancelot_(fate) -> melusine_(fate)
create alias tam_lin_lancelot_(fate) -> melusine_(fate)
Fairy Knight Tristan and Gawain were just released in the NA server of FGO today, and apparently their names have been localized as "Tam Lin X" instead of "Fairy Knight X", so I think it makes sense to alias the new names to the existing tags.
I've also included an alias for Fairy Knight Lancelot here too. Technically she isn't released yet, but assuming they don't break the pattern, she'll probably be called Tam Lin Lancelot.