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 😎

Loops federation source code that handles dereferencing activity objects
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