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perf(db): close panel database connections after a minute idle #198

Job	Run time
service-image-builds (schedule, ./Dockerfile.schedule)	5m 58s
service-image-builds (server, ./Dockerfile.server)	4m 37s
service-image-builds (cloud, ./Dockerfile.cloud)	6m 33s
main-image-smoke	7m 19s
	24m 27s