Bolt
database
Redis Cache Returning Stale Data - Cache Not Invalidating
Users see old data from Redis cache even after updates. Cache doesn't invalidate when data changes.
Data appears correct in database but cached version is stale.
Error Messages You Might See
Cache showing old data
Update doesn't reflect in UI
Data mismatch between cache and database
Stale cache persisting
Common Causes
- Cache TTL too long - data expires slowly
- No cache invalidation on update/delete operations
- Cache key structure doesn't match query conditions
- Updating database but forgetting to delete cache
- Multiple cache keys for same data causing duplicates
How to Fix It
Invalidate cache on writes: after update, delete cache key: redis.del('user:123')
Use pattern deletion: redis.del('user:*') to clear all user cache
Set reasonable TTL: 5-60 minutes depending on data freshness needs
Implement cache versioning: 'user:v1:123' changes if schema changes
Use Redis pub/sub to invalidate cache across multiple servers
Real developers can help you.
PawelPloszaj
I'm fronted developer with 10+ years of experience with big projects. I have small backend background too
Omar Faruk
As a Product Engineer at Klasio, I contributed to end-to-end product development, focusing on scalability, performance, and user experience.
My work spanned building and refining core features, developing dynamic website templates, integrating secure and reliable payment gateways, and optimizing the overall system architecture.
I played a key role in creating a scalable and maintainable platform to support educators and learners globally.
I'm enthusiastic about embracing new challenges and making meaningful contributions.
Sage Fulcher
Hey I'm Sage! Im a Boston area software engineer who grew up in South Florida. Ive worked at a ton of cool places like a telehealth kidney care startup that took part in a billion dollar merger (Cricket health/Interwell health), a boutique design agency where I got to work on a ton of exciting startups including a photography education app, a collegiate Esports league and more (Philosophie), a data analytics as a service startup in Cambridge (MA) as well as at Phillips and MIT Lincoln Lab where I designed and developed novel network security visualizations and analytics. I've been writing code and furiously devoted to using computers to make people’s lives easier for about 17 years. My degree is in making computers make pretty lights and sounds. Outside of work I love hip hop, the Celtics, professional wrestling, magic the gathering, photography, drumming, and guitars (both making and playing them)
Franck Plazanet
I am a Strategic Engineering Leader with over 8 years of experience building high-availability enterprise systems and scaling high-performing technical teams. My focus is on bridging the gap between complex technology and business growth.
Core Expertise:
🚀 Leadership: Managing and coaching teams of 15+ engineers, fostering a culture of accountability and continuous improvement.
🏗️ Architecture: Enterprise Core Systems, Multi-system Integration (ERP/API/ETL), and Core Database Structure.
☁️ Cloud & Scale: AWS Expert; architected systems handling 10B+ monthly requests and managing 100k+ SKUs.
📈 Business Impact: Aligning tech strategy with P&L goals to drive $70k+ in monthly recurring revenue.
I thrive on "out-of-the-box" thinking to solve complex technical bottlenecks and am always looking for ways to use automation to improve business productivity.
Richard McSorley
Full-Stack Software Engineer with 8+ years building high-performance applications for enterprise clients. Shipped production systems at Walmart (4,000+ stores), Cigna (20M+ users), and Arkansas Blue Cross. 5 patents in retail/supply chain tech. Currently focused on AI integrations, automation tools, and TypeScript-first architectures.
BurnHavoc
Been around fixing other peoples code for 20 years.
Yovel Cohen
I got a lot of experience in building Long-horizon AI Agents in production, Backend apps that scale to millions of users and frontend knowledge as well.
Mehdi Ben Haddou
- Founder of Chessigma (1M+ users) & many small projects
- ex Founding Engineer @Uplane (YC F25)
- ex Software Engineer @Amazon and @Booking.com
legrab
I'll fill this later
Matt Butler
Software Engineer @ AWS
You don't need to be technical. Just describe what's wrong and a verified developer will handle the rest.
Get HelpFrequently Asked Questions
What's a good cache TTL?
User data: 1 hour. Product data: 24 hours. Real-time data: 5 minutes. Balance freshness and performance
Should I invalidate on every update?
Yes, delete cache key on write. Otherwise users see outdated data
How do I handle cache across multiple servers?
Use Redis pub/sub: publish invalidation message. All servers receive and delete cache