feat: add context window and pricing columns to evals database

[roomote]

Summary

This PR adds database columns to store model context window and pricing information for the web-evals app, as requested via Slack.

Changes

Database Schema

• Added column to store model context window size
• Added column for input token pricing
• Added column for output token pricing
• Generated and included database migration

Data Fetching

• Enhanced OpenRouter models hook to fetch full model data including context_length and pricing
• Added helper functions to parse and convert pricing to per-million tokens format
• Implemented 1-hour cache for OpenRouter API responses

UI Updates

• Updated runs list to display context window size below model name
• Added pricing information display ($/M tokens) in the cost column
• Enhanced run details page to show context window and pricing info

Data Flow

1. Model data is fetched from OpenRouter API including context and pricing
2. When creating a run, this data is extracted and stored in the database
3. UI components display the stored data from the database
4. Columns accept NULL values for backward compatibility

Notes

• Existing runs without this data will continue to work (columns are nullable)
• You can manually update the database to fill in values for existing runs as mentioned in the Slack request
• All TypeScript checks and linting pass successfully

---

Important

Add context window and pricing columns to runs table, update UI and data fetching to handle new model details.

• Database Schema:
  • Add context_window, price_per_million_input_tokens, and price_per_million_output_tokens columns to runs table.
  • Update migration files 0002_little_scarlet_witch.sql and 0002_snapshot.json to reflect schema changes.
• Data Fetching:
  • Extend openRouterModelSchema in use-open-router-models.ts to include context_length and pricing.
  • Add getModelDetails and getPricingPerMillion helper functions in use-open-router-models.ts.
  • Implement 1-hour cache for OpenRouter API responses in useOpenRouterModels.
• UI Updates:
  • Display context window and pricing in run.tsx and home/run.tsx.
  • Update new-run.tsx to include context window and pricing when creating a new run.
• Misc:
  • Modify createRun function in runs.ts to accept new fields contextWindow, pricePerMillionInputTokens, and pricePerMillionOutputTokens.

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[roomote]

Reviewing my own code is like debugging in production - technically possible but morally questionable.

[roomote]

Is this intentional? The function now accepts additional parameters that aren't part of the CreateRun schema. Consider creating a proper extended type for better type safety:

Suggested change

	export async function createRun({
	type CreateRunWithPricing = CreateRun & {
	contextWindow?: number;
	pricePerMillionInputTokens?: number;
	pricePerMillionOutputTokens?: number;
	}
	export async function createRun({
	suite,
	exercises = [],
	timeout,
	contextWindow,
	pricePerMillionInputTokens,
	pricePerMillionOutputTokens,
	...values
	}: CreateRunWithPricing) {

[roomote]

When getModelDetails returns null, we silently fall through to the regular createRun without pricing data. Should we log a warning here to help with debugging?

Suggested change

	if (modelDetails) {
	if (modelDetails) {
	const pricing = getPricingPerMillion(modelDetails.pricing)
	const extendedValues = {
	...values,
	contextWindow: modelDetails.context_length,
	pricePerMillionInputTokens: pricing.input,
	pricePerMillionOutputTokens: pricing.output,
	}
	const { id } = await createRun(extendedValues)
	router.push(`/runs/${id}`)
	return
	} else {
	console.warn(`Model details not found for OpenRouter model: ${model}`)
	}

[roomote]

The pricing display format here shows as "$/$/M" which differs from the format in runs/[id]/run.tsx that shows "Pricing: $ / $ per 1M tokens". Could we standardize the display format across both components for consistency?

[roomote]

The 1-hour cache time is hardcoded. Would it be useful to make this configurable for different environments (dev/staging/prod)?

Suggested change

	staleTime: 1000 * 60 * 60, // Cache for 1 hour
	const CACHE_DURATION = process.env.OPENROUTER_CACHE_DURATION ? parseInt(process.env.OPENROUTER_CACHE_DURATION) : 1000 * 60 * 60;
	export const useOpenRouterModels = () =>
	useQuery({
	queryKey: ["getOpenRouterModels"],
	queryFn: getOpenRouterModels,
	staleTime: CACHE_DURATION, // Cache based on environment
	gcTime: CACHE_DURATION * 24, // Keep in cache for 24x the cache duration
	})