This file is indexed.

/usr/share/kamailio/postgres/matrix-create.sql is in kamailio-postgres-modules 4.0.4-1ubuntu2.

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

The actual contents of the file can be viewed below.

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INSERT INTO version (table_name, table_version) values ('matrix','1');
CREATE TABLE matrix (
    first INTEGER NOT NULL,
    second SMALLINT NOT NULL,
    res INTEGER NOT NULL
);

CREATE INDEX matrix_matrix_idx ON matrix (first, second);