SQLite's lower() folds ASCII only, so a device could hold "Café" and
"CAFÉ" as two tags while the server held one. derive::fold (to_lowercase)
is now the one comparison. It is registered as the deterministic SQL function
fold() on every connection (schema::migrate), and find_or_create, the rename
clash, the pull clash and the unique index all use it. derive's push_unique
used eq_ignore_ascii_case and now folds the same way.
v14 merges pairs a device already holds before rebuilding the index. The
older row survives, as in rename_label. Memberships move with via_tag kept,
affected notes go dirty, and the merged-away row is a pending delete. It is
written out rather than calling store::merge_labels so the migration doesn't
depend on store code that later versions may change.
rusqlite gains its "functions" feature (operator-approved, 2026-10-08).
grammar.json gains "#café and #CAFÉ" -> ["café"], which all three
implementations run.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
bvandeusenandClaude Opus 5.5
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