Timeline

Final review of c077fa4. F.1 requires recording a refusal, not deleting the bytes, and every finding came from the deletion:

- A delta built on a swept seed lost its basis, was withheld forever, and could not be re-pushed, because it counted as held. - The end-of-sync sweep ran outside a transaction. - A refused hash pulled from an upstream was dropped, which is a receive-side behaviour F.1 does not have.

So a refused seed stays stored: - Its hash is recorded in seedrefused. - It leaves unclustered, so no inventory or cluster names it. - It is withheld from every reply, and the link step never links it. - Deltas on it stay readable and are judged like any other pending row. - Pulling the same hash stores nothing new: the row is held, and stays refused. - A re-push of it is refused on its bytes. Every form (full text, delta on a held basis, delta whose own row is held) expands to the seed.

Removed: - Sweep, sweepRow and its no-root marking. - Every Sweep call: handler request end, end of sync, check-in, tag and rebuild. - requestPhantoms' refused-hash filter (a refused seed is held, so never a phantom). - ownSeedReadable's refused-hash check and its Clear (the fill's JudgeFilled already clears a non-seed). - JudgeFilled's lazy re-root, which nothing reached: only full text fills a root JudgeFilled hears of.

Kept, each pinned by a test: - Pending rows keyed by chain root, with MarkPending moving the rows waiting on a rid when that rid is itself pushed as a dangling delta. Filling a phantom with a delta triggers no cascade, so this is the re-root that matters. - JudgeFilled examining only its subtree, and its hash-mismatch skip. - The link-step judge and the refused-hash check in it. - The push-time atomic refusal. - Withholding pending and refused rows, and Purge forgetting pending rows (rids are reused).

Only pushed dangling deltas are marked pending. A dangling delta stored by a pull onto a pending row's basis is not, so rows waiting on it stay withheld until the link step reaches them; a plain file among them stays withheld.

Tests: - The reviewer's probe, for a control artifact and a plain file built on a pending seed, pushed after it and before it: after the base arrives both are readable and not withheld, and the control artifact is linked and served. - A plain file after a forged delta is still cleared. - Every judge, filter and mark fails a test when disabled, except two performance mechanisms no behaviour shows: the per-transaction table cache and IsSeedBytes' byte prefilter. check-in: 6083693442 user: [email protected] tags: main, trunk

A store keeps a seed only through a horizon-seed announcement. This lands with the zit 0.7.2 draft re-pin, after feat/471's F.1.

- storeReceived refuses, before storing, a seed it can read: full text, or a delta verified against a held basis (errSeed). The push handler turns it into the atomic refusal. The client and clone drop it: not stored, not counted, and its in-memory phantom forgotten. Its hash is refused. - A hash refused earlier is dropped when sent again, even as a dangling delta, and a client never makes a phantom of one, so it is not asked for again. - The link step refuses any seed-shaped artifact it reaches, whatever stored it. An announced seed is held outside the artifact store, so it never reaches the link step. This catches a seed completed in a later round of a pull or clone, through the dephantomize cascade or the clone's receive linker, from the deck the link step has already parsed. - Received dangling deltas are not marked pending. A clone's history chains arrive newest first, and judging each would expand it a second time. - A clone sweeps refused rows after its linker finalizes.

B.2's last sentence follows F.2. A seed-shaped artifact outside an announcement is ordinary only with neither this store's label nor a binding card. hzSeedOrdinary mints under zit's label, and the docs and the HZ-5.2-4 scope note cite F.2 and F.3.

Tests: - A pull dropping a seed by label and by card, counted correctly and not asked for again by a second peer. - A seed delta completed in a later round, dropped on pull and on clone. - A clone dropping label, card and a re-sent form, counting none. - A refused seed re-sent to a client as a dangling delta. - Disabling any of these mechanisms fails a test. check-in: 21746b5036 user: [email protected] tags: feat/horizon-dfloor-receive, main, trunk

# Conflicts: # CHANGELOG.md check-in: 351bb4f35b user: [email protected] tags: main, trunk