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feat: Case-insensitive search for non-ASCII messages (#5052)
SQLite search with `LIKE` is case-insensitive only for ASCII chars. To make it case-insensitive for all messages, create a new column `msgs.txt_normalized` defaulting to `NULL` (so we do not bump up the database size in a migration) and storing lowercased/normalized text there when the row is created/updated. When doing a search, search over `IFNULL(txt_normalized, txt)`.
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