We keep a register of rows that each cite a place in the codebase. A row is fresh while the bytes it cited are still there and stale once they move or change, so a citation can go red instead of quietly rotting. Nine of those rows cited the same line: the one declaring which layers exist.
Source: [Dev.to](https://dev.to/mahirhir/my-freshness-check-went-stale-every-time-someone-did-the-right-thing-1eni)