The refresh in #320 rebuilt the open list from issue STATE. The follow-up commit on this branch fixed the #155 entry but repeated the same mistake on the entry it wrote to replace it. An audit of every entry against its issue thread, its pull requests and main found that all four were wrong, in three different ways. #289 was a copy of the issue body and gave no sign that work is in flight. The decompression half already merged (#307, 3.8 percent on q4 and 3.2 on q5) and the aggregation half is open as #321. The "about 4x behind TimescaleDB" line reads as the size of the prize for that work, but #321 measures 1.20x and 1.38x, and by its own account the larger lever is dictionary-coded grouping. The widest gap, q6 at 5.3x behind and 3.1x slower than heap, is the only shape where columnar loses to heap and nothing in flight touches it. #300 was framed as core COPY's per-field parse. #300's own profile refuted that before the entry was written: parse is about 21 percent, encode about 53 percent, so bypassing the parser cannot make columnar beat heap. The measured top lever is parallelism over the existing encoder with COPY unchanged, prototyped at 7.39x. IMPORT_THROUGHPUT_PLAN.md was cited as the reference and is the wrong pointer: it predates the #283 to #286 work and puts COPY under "Not in scope". reltuples is removed. It was fixed on 2026-07-28 by #189 and is now exact on every measured shape, and the cause the entry gave was explicitly disproven: it was a block-offset mismatch, not blocks holding no row-group data. The line was written about nine hours before the fix and survived two refreshes. #310 is no longer listed as work. Both causes are merged and it was re-measured at 100M, 273,212 buffers to 8,917. It stays open for a confirmation reading on the real dataset. #291 was open and absent from the list; added, with the note that its documentation half landed in #298. Also fixed, all verified: the "Deferred, not yet built" paragraph listed two things that have been on main since 2026-07-23; a cross-reference to "item 0" that #320's renumbering left dangling; six Done rows naming the extension schema as columnar rather than pgcolumnar, which a reader copying them would find does not exist; and a closed-since line with the wrong date and three omissions. Refs #289, #300, #291, #310. No issue is closed by this commit. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_011miCFRSatixeNRw3w5yNq8

Audit all code comments and documentation #291

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