This file is indexed.

/usr/share/stacks/sql/chr_index.sql is in stacks-web 1.35-1ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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create table chr_index (
       id    	int unsigned not null primary key auto_increment,
       batch_id	int unsigned not null,
       chr      varchar(32),
       max_len  int unsigned not null
);