/usr/share/libpreludedb/classic/mysql-update-14-4.sql is in libpreludedb0 1.0.0-1.1build2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | UPDATE _format SET version="14.4";
ALTER TABLE Prelude_AdditionalData CHANGE data data BLOB NOT NULL;
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