Function cleanupLatencies

site/src/contexts/useProxyLatency.ts:303–323

(
	stored: Record<string, ProxyLatencyReport[]>,
	regions: readonly Region[],
	now: Date,
	maxStored: number,
)

};

const cleanupLatencies = (
	stored: Record<string, ProxyLatencyReport[]>,
	regions: readonly Region[],
	now: Date,
	maxStored: number,
): Record<string, ProxyLatencyReport[]> => {
	for (const [proxyId, reports] of Object.entries(stored)) {
		if (!regions.find((region) => region.id === proxyId)) {
			delete stored[proxyId];
			continue;
		}
		const nowMS = now.getTime();
		stored[proxyId] = reports.filter((report) => {
			// Only keep the reports that are less then 1 week old.
			return new Date(report.at).getTime() > nowMS - 1000 * 60 * 60 * 24 * 7;
		});
		// Only keep the 5 latest
		stored[proxyId] = stored[proxyId].slice(-1 * maxStored);
	}
	return stored;
};