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/usr/share/kamailio/mysql/matrix-create.sql is in kamailio-mysql-modules 4.4.4-2+deb9u3.

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The actual contents of the file can be viewed below.

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CREATE TABLE `matrix` (
    `first` INT(10) NOT NULL,
    `second` SMALLINT(10) NOT NULL,
    `res` INT(10) NOT NULL
);

CREATE INDEX matrix_idx ON matrix (`first`, `second`);

INSERT INTO version (table_name, table_version) values ('matrix','1');