/usr/share/libpreludedb/classic/pgsql-update-14-4.sql is in libpreludedb7-pgsql 4.1.0-1.
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 ALTER COLUMN data SET NOT NULL;
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