fix: adjust read benchmark settings #60

Job	Run time
MySQL Reads Benchmark	16m 38s
PostgreSQL Reads Benchmark	16m 18s
MySQL Writes Benchmark	11m 33s
PostgreSQL Writes Benchmark	6m 8s
SQLite Writes Benchmark	6m 15s
SQLite Reads Benchmark	18m 6s
Push Results	11s
	1h 15m 9s

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