docs: update billing model from datapoints to bytes-based pricing

[karimhass]

• Update get-query-result and get-query-result-csv endpoints to reference result size billing
• Update uploads-create to use size-based credit consumption instead of fixed 10 credits
• Update uploads-insert with new 3 credits/GB pricing for all self-serve plans
• Update uploads-csv: remove Premium requirement, add write costs, increase file limit to 500MB
• Update materialized-views/refresh to include data written in credit consumption
• Overhaul billing.mdx:
  • Replace datapoints pricing with GB-based export pricing
  • Add Analyst plan to all tables
  • Add Data Writes section (3 credits/GB)
  • Update storage limits (Free: 100MB, Analyst: 1GB, Plus: 15GB)
  • Update webhooks (Free: 1, Analyst: 5, Plus: 5)
  • Remove old datapoints formula and spillover calculation

DO NOT MERGE until January 22, 2026

[cursor]

PR Summary

Shifts API billing docs from datapoint-based to size (GB)-based pricing and updates affected endpoints and limits.

• Overhauls billing.mdx: introduces GB-based charges for exports (plan-specific rates) and writes (3 credits/GB with 1-credit minimum), clarifies execution crediting by performance tier, updates storage and webhooks tables (adds Analyst plan), and notes Queries Endpoint availability
• Updates get-query-result and get-query-result-csv tips to bill by result size with link to Billing
• Adds data-written costs to materialized-views/refresh notes
• Tables endpoints:
  • uploads-create: switches to size-based credits with 1-credit minimum
  • uploads-insert: bills 3 credits/GB written (min 1 credit)
  • uploads-csv: raises file limit to 500MB, documents write costs, and removes private-upload restriction

^{Written by Cursor Bugbot for commit bbac67c. Configure here.}

[norbertdurcansk]

https://dune-data-pricing-billing-update.mintlify.app/api-reference/overview/billing#write-operations
This should say min 1 credit

I wouldn't mention this. It only applies to new enterprise clients