Improve performance by inserting in a bulk #1484

Job	Run time
mariadb (locked, 8.3, ubuntu-latest, 10.3)	49s
mariadb (locked, 8.3, ubuntu-latest, 10.6)	1m 21s
mariadb (locked, 8.3, ubuntu-latest, 10.10)	1m 6s
mysql (locked, 8.3, ubuntu-latest, 5.7)	1m 2s
mysql (locked, 8.3, ubuntu-latest, 8.0)	1m 10s
Postgres (locked, 8.3, ubuntu-latest, 11.19-alpine)	1m 26s
Postgres (locked, 8.3, ubuntu-latest, 12.14)	1m 16s
Sqlite (locked, 8.3, ubuntu-latest)	16s
Postgres (locked, 8.3, ubuntu-latest, 13.10)	1m 13s
Postgres (locked, 8.3, ubuntu-latest, 14.7)	1m 25s
Postgres (locked, 8.3, ubuntu-latest, 15.2)	53s
	11m 57s

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