webcoderspeed.com
1276 articles
How to implement Clerk authentication in production SaaS applications, comparing alternatives, building multi-tenant systems with organisations, and syncing user data with your database.
ClickHouse is a columnar database that ingests millions of rows per second. Learn when it beats PostgreSQL, MergeTree engines, and how to integrate it with your Node.js stack.
Master ClickHouse for analytics: MergeTree engines, materialized views, CDC from Postgres, dual-write patterns, and query optimization.
Server A issues a JWT. Server B validates it 2 seconds later but thinks the token was issued in the future — invalid. Or a token that should be expired is still accepted because the validating server''s clock is 5 minutes behind. Clock skew causes authentication failures and security holes.
The startup was running fine at $3,000/month AWS. Then a feature launched, traffic grew, and the bill hit $47,000 before anyone noticed. No alerts. No budgets. No tagging. Just a credit card statement and a very uncomfortable board meeting.