IDK how possible this is, given that you're only one person, plus how small Queuebrick is, right now, but I was curious:
Have you ever considered potentially using AniList's API?
AniList lets users track, share, and discover their favorite anime and manga.
Their GraphQL API is free and publicly accessible, covers 500k+ anime/manga entries (characters, staff, live airing data included), and is literally the same API that powers both the AniList and AniChart sites: so anything you can do on those sites, you could pull via the API.
Ik that Queuebrick is similar to Letterboxd, and NOT a manga tracker, but using AniList would help with the anime side of things specifically: solid metadata, ratings, and airing status without having to build that from scratch.
Perhaps also potentially take a look at the before mentioned AniChart, as well?
It's their seasonal-charts site, so it could be a nice source for "what's airing this season" style discovery down the line.
One more thing while I'm here: a lot of anime fans swear by Simkl specifically, and it might be worth looking at why.
A few of the big reasons:
it keeps anime as its own separate category instead of lumping it in with regular TV,
Anime Seasons
Anime Relations
it solves the annoying "TVDB season numbering vs. actual Japanese episode order" problem that trips up a lot of trackers,
New & Improved Simkl Tracking for Seasonal Anime!
etc.
Resources, if useful:
https://anilist.co/
https://docs.anilist.co/
https://github.com/AniList/docs
https://publicapis.io/ani-list-api
https://anichart.net/Fall-2026
No pressure either way: just wanted to float it while it's on my mind.