{"answer":"I have full context now. Checking the pre-existing tests: `Duration::from_mins` was already used in `config.rs` tests before this PR, so the toolchain already requires Rust 1.91+ — no finding there. Cross-referencing the sweep logic against `store.rs` (temp files in `incoming/` for both blob writes *and* index links, commit→link gap) and `cache.rs` (fetch path), here are the defects:\n\n🟠 `bug` services/proxy/src/sweep.rs:119: a blob with no index entry is deleted regardless of `min_age`, but a fetch commits the blob (cache.rs:151) and only writes the index entry after a registry round-trip (cache.rs:163), so a sweep in that seconds-long gap deletes the just-committed blob — the in-flight request then 500s at cache.rs:90-97 (\"already missing from the store\") despite the artifact existing.\n\n🟠 `bug` services/proxy/src/sweep.rs:140: `forget(&index, &gone)` runs unconditionally and `gone` is populated even when `dry_run` is true (line 137 sits outside the `if !dry_run` guard), so `POST /v1/admin/cache/sweep?dry_run=true` — documented as removing nothing — deletes live index entries for every blob it would have reclaimed, forcing refetches of all of them.\n\n🟠 `bug` services/proxy/src/sweep.rs:232: `clear_partials` deletes every file in `incoming/` with no age or name check, but in-flight downloads and index-link temp files live there (store.rs:171-180 and store.rs:147); a sweep overlapping any active fetch unlinks its temp file from under the open handle, so `commit`'s rename fails with ENOENT and a download that succeeded upstream returns a 500.\n\n🟠 `bug` services/proxy/src/routes/admin.rs:76: the on-demand sweep calls `sweeper.sweep()` directly, bypassing the `Mutex` that `run()` holds for the whole sweep (sweep.rs:83), so an HTTP-triggered sweep can run concurrently with the interval sweep — the exact \"two sweeps over one directory\" over-deletion the module says the type prevents (sweep.rs:10-12) — and both will double-count the reclaimed metrics.\n\n🟠 `bug` services/proxy/src/metrics.rs:94: `values()` loads `sweep_bytes_reclaimed` then `sweep_blobs_removed`, but `COUNTERS` declares blobs first (lines 50-57), so the two counters are exported swapped — `cairn_proxy_sweep_blobs_removed_total` reports bytes and `cairn_proxy_sweep_bytes_reclaimed_total` reports blob counts, defeating the pairing comment at lines 30-32 and the alerting docs/operations.md prescribes on the bytes counter.\n\n🟠 `performance` services/proxy/src/main.rs:116: `sweeper.run()` executes the entire synchronous `std::fs` walk (readdir + stat + unlink over the whole store) directly on a runtime worker thread with no `spawn_blocking`, stalling request handling on that worker for the duration of the sweep — the same applies to the admin handler at routes/admin.rs:76, which is additionally on the untimed router so it can block for minutes on a large store.\n\n🟡 `bug` services/proxy/src/sweep.rs:135: after a failed `fs::remove_file` (line 126) the candidate is still counted in `removed`/`bytes` and pushed to `gone`, so the reported and recorded reclamation exceeds what was actually freed, and `forget` (line 140) deletes index entries for blobs that are still on disk.\n\n🔵 `bug` services/proxy/src/main.rs:115: `tokio::time::interval` completes its first tick immediately, contradicting the comment at lines 101-102 (\"the first tick is one interval away\") — a freshly started proxy sweeps at boot; 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