src/vs/workbench/contrib/snippets/browser/snippetsService.ts/SnippetUsageTimestamps/updateUsageTimestamp
class SnippetUsageTimestamps:	updateUsageTimestamp(id: string): void {
		// map uses insertion order, we want most recent at the end
		this._usages.delete(id);
		this._usages.set(id, Date.now());

		// persist last 100 item
		const all = [...this._usages].slice(-100);
		this._storageService.store(SnippetUsageTimestamps._key, JSON.stringify(all), StorageScope.PROFILE, StorageTarget.USER);
	}