gotchas

Writes can fail silently. Check tail logs.

Skills
Development
0

What it does and how to use it

A skill that teaches Claude Code to do development tasks well. It is packaged knowledge the model uses whenever it is relevant.

Install the skill (command above).
In Claude Code, describe what you need - the skill turns on by itself when the context fits.
No commands to memorize: you talk in plain language and the skill does the rest.

Install (Claude Code)

mkdir -p .claude/skills/gotchas-4 && curl -fsSL https://doutorai.pt/data/lib/skills__gotchas-4.md -o .claude/skills/gotchas-4/SKILL.md

Paste this command into the terminal, in your project folder, and the component installs automatically.

Content

# Analytics Engine Gotchas

## Critical Issues

### Sampling at High Volumes

**Problem:** Queries return fewer points than written at >1M writes/min.

**Solution:**
```typescript
// Pre-aggregate before writing
let buffer = { count: 0, total: 0 };
buffer.count++; buffer.total += value;

// Write once per second instead of per request
if (Date.now() % 1000 === 0) {
  env.ANALYTICS.writeDataPoint({ doubles: [buffer.count, buffer.total] });
}
```

**Detection:** `npx wrangler tail` → look for "sampling enabled"

### writeDataPoint Returns void

```typescript
// ❌ Pointless await
await env.ANALYT

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