refactor to db pattern #266

Job	Run time
test (8.1, MOODLE_401_STABLE, pgsql, false)	4m 8s
test (8.1, MOODLE_401_STABLE, mariadb, false)	4m 18s
test (8.1, MOODLE_402_STABLE, pgsql, false)	3m 32s
test (8.1, MOODLE_402_STABLE, mariadb, false)	3m 31s
test (8.1, MOODLE_403_STABLE, pgsql, false)	3m 57s
test (8.1, MOODLE_403_STABLE, mariadb, false)	4m 2s
test (8.1, MOODLE_404_STABLE, pgsql, false)	4m 17s
test (8.1, MOODLE_404_STABLE, mariadb, false)	4m 3s
test (8.2, MOODLE_402_STABLE, pgsql, false)	3m 18s
test (8.2, MOODLE_402_STABLE, mariadb, false)	3m 26s
test (8.2, MOODLE_403_STABLE, pgsql, false)	4m 2s
test (8.2, MOODLE_403_STABLE, mariadb, false)	4m 0s
test (8.2, MOODLE_404_STABLE, pgsql, false)	4m 3s
test (8.2, MOODLE_404_STABLE, mariadb, false)	4m 0s
test (8.3, MOODLE_404_STABLE, pgsql, false)	4m 7s
test (8.3, MOODLE_404_STABLE, mariadb, false)	3m 54s
test (8.3, main, mariadb, true)	4m 1s
	1h 6m 39s

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