#381 - improve unique indexes from schema #292

Job	Run time
ci / check if job needs to run	5s
ci / prepare test matrix	0s
ci / ${{ matrix.moodle-branch }} - ${{ matrix.database }} - php ${{ matrix.php }} - ${{ needs.prepare_matrix.outputs.component }}	0s
ci / Release to the Moodle plugin directory	0s
	5s

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