shoney.arickathil b758f2978d fix(db2-delta): fold's cycle guard checks direction, not step count ... - wal.c: wo_wal_fold_row_at now refuses any delta back-pointer that does not point strictly earlier than the record naming it (back_off >= cur), instead of capping total hops at off/13+1 - this is the real invariant, not a proxy for it: a step-count bound lets a forward-pointing back-pointer through in one hop whenever it happens to land on a genuine record, returning a plausible-but-wrong row instead of refusing it - removes the 13-byte-record magic number entirely; no arithmetic tied to record framing remains in the guard - wal.h: docblock updated to describe the direction invariant - test_wal.c: two new tests — self-pointing back-pointer (boundary case, back_off == cur) and forward-pointing back-pointer to a real future record for the same row (the actual gap: verified failing against the old step-count guard, passing after the fix) Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> (cherry picked from commit 173dbf28a42d45a8c7f9fe430355f61f70c81935)		2026-08-30 20:37:27 +02:00
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src	fix(db2-delta): fold's cycle guard checks direction, not step count	2026-08-30 20:37:27 +02:00