## v1.26.2 (2026-10-09)

v1.26.2 (2026-10-09)

Mirroring Calibre 9.16: the first parity-watch audit lane

Calibre 9.16 shipped on 2026-10-09 and tripped the new parity-watch
automation's schema-search tier (seven files under src/calibre/db/
moved, the most since 9.12). The full read-only audit against this tree
found one real divergence and ratified everything else; the per-file
verdicts live in the roadmap's Calibre 9.16 watch audit section.

• Custom-column writes now collapse whitespace exactly like upstream's
  text adapters: single-valued text, series, and enumeration values go
  through the single_text mirror (' '.join(x.split()) over the
  stripped string; a whitespace-only value clears via its empty-to-None
  rule), and each item of a multi-valued text write collapses like
  upstream's multiple_text adapter has always done -- in both write
  verbs, set_custom_column and add_custom_column_values. Enumeration
  values are adapted BEFORE validation, so a double-spaced spelling of a
  listed value now normalizes and passes instead of raising. cquarry
  used to strip ends only and store the interior verbatim, so rows
  written here and rows written by the 9.16 GUI disagreed for values
  carrying double spaces or line breaks. Comments columns are
  unaffected: upstream deliberately moved them to the verbatim
  long_text adapter, so their behavior is unchanged.
• Schema v27 ratified. The book_storage table cquarry mirrored
  from master in 1.25 shipped upstream in 9.16 with the same DDL and
  write semantics; the audit confirmed the support gate (`user_version

  27, fresh libraries born at 28, upgrades land there too) and cquarry's _require_table` ValueError on pre-v27 schemas. No code
  change was needed; CLAUDE.md's blob-writer bullet now records the
  shipped fact.

• The roadmap records the audit: the 9.16 verdict per file (the
  search fast path and the categories cache need no action; the
  read-path reworks are internal mechanics), the stale gap row for
  get_book_storage (shipped in af41e52) removed, and the
  snapshot-retry hardening candidate updated to 9.16's 60-second
  busy-time budget + can_use_sqlite_in probe + /tmp fallback
  reference shape.
• Nothing is owed downstream: no caller in CalibreQuarry, bindery-cli,
  Hermitage, or Carrel-calibre-web writes custom columns through
  cquarry yet.