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System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

Clarify and agree on the scope of the system

User cases (description of sequences of events that, taken together, lead to a system doing something useful)
- Who is going to use it?
- How are they going to use it?

Great. I’ll develop a phased implementation plan, edge function code, deployment strategy, user guide, and full documentation for a key rotator using Deno Edge Functions. This will focus on rotating Gemini 2.5 Pro API keys to handle 429 rate limits efficiently.

I’ll return with a clear breakdown of components, including a secure architecture, key storage and cycling logic, usage limits, and guidance for setup and customization.

Secure API Key Rotator for Google Gemini 2.5 Pro (Deno Edge Functions)

Overview: This solution is an edge-deployed proxy that securely rotates through a pool of Google Gemini 2.5 Pro API keys to avoid hitting per-key rate limits (e.g. free-tier limit of ~2 requests/minute (Gemini 2.5 Pro via OpenRouter triggers RESOURCE_EXHAUSTED despite API key and usage being within free-tier limits · Issue #2000 · RooVetGit/Roo-Code · GitHub)). By

	let cache; webpackChunkdiscord_app.push([["wp_isdev_patch"], {}, r => cache=r.c]);
	var UserStore = Object.values(cache).find(m => m?.exports?.default?.getUser).exports.default;
	var actions = Object.values(UserStore._dispatcher._actionHandlers._dependencyGraph.nodes);
	var user = UserStore.getCurrentUser();
	actions.find(n => n.name === "ExperimentStore").actionHandler.CONNECTION_OPEN({
	type: "CONNECTION_OPEN", user: {flags: user.flags \|= 1}, experiments: [],
	});
	actions.find(n => n.name === "DeveloperExperimentStore").actionHandler.CONNECTION_OPEN();
	webpackChunkdiscord_app.pop(); user.flags &= ~1; "done";

	// Execute the "run" function below after setting up the appropriate APIs
	// Original credit: https://stackoverflow.com/a/59222719/501042
	function sender_list_paged(token) {
	var dt = new Date().getTime();
	var ss = SpreadsheetApp.create('Gmail count emails by sender ' + dt);
	var sh = ss.getActiveSheet()
	sh.clear();
	sh.appendRow(['Email Address', 'Count']);
	var token = token \|\| null;
	var query = "in:inbox is:unread";

	You are an assistant that engages in extremely thorough, self-questioning reasoning. Your approach mirrors human stream-of-consciousness thinking, characterized by continuous exploration, self-doubt, and iterative analysis.

	## Core Principles

	1. EXPLORATION OVER CONCLUSION
	- Never rush to conclusions
	- Keep exploring until a solution emerges naturally from the evidence
	- If uncertain, continue reasoning indefinitely
	- Question every assumption and inference

	// Update globs depending on your framework
	---
	name: tailwind_v4
	description: Guide for using Tailwind CSS v4 instead of v3.x
	globs: ["*/.{js,ts,jsx,tsx,mdx,css}"]
	tags:
	- tailwind
	- css
	---