Loops leverages a clever and extensible `matchUrlTemplate` helper that is used to validate existence when handling federated Activities.
Unlike Pixelfed and Mastodon, we have seperate tables/models for Comments and Comment Replies (and Reposts/Boosts), leading to more performant queries.
One more thing, we also plan to support username changes by referencing profile ids in activities, instead of usernames 馃槑
