Database Change Streams Not Firing in Windsurf App
Your Windsurf-generated app uses database change streams or real-time subscriptions to push updates to the frontend, but events are not firing. Inserts, updates, and deletes in the database don't trigger the real-time listeners, so the UI stays stale and users have to manually refresh to see new data.
This is critical for features like live feeds, collaborative editing, real-time dashboards, and chat applications. Cascade sets up the subscription code, and it may work intermittently or only for certain operations, making the bug difficult to reproduce and diagnose.
The issue may appear as a dashboard that only updates on page refresh, a chat where new messages don't appear until you reload, or a collaborative document that doesn't reflect other users' changes in real time.
Error Messages You Might See
Common Causes
- Replica set not configured (MongoDB) — MongoDB change streams require a replica set. A standalone MongoDB instance silently ignores change stream requests
- Realtime not enabled on table (Supabase) — Supabase requires explicitly enabling real-time on each table in the dashboard or via SQL
- Subscription filter too restrictive — The change stream filter or subscription filter excludes the events you're expecting (e.g., filtering for INSERT but needing UPDATE)
- Connection closed silently — The change stream or WebSocket connection drops due to inactivity timeout, and the app doesn't reconnect
- Row Level Security blocking events — Supabase real-time respects RLS policies, so the subscription user may not have permission to see the changes
How to Fix It
- Verify database prerequisites — For MongoDB: confirm you're using a replica set (rs.status() in mongo shell). For Supabase: enable real-time on the table in Dashboard > Database > Replication
- Test with a broad subscription first — Remove all filters and subscribe to all changes on the table. If this works, narrow down filters one at a time to find what's excluding your events
- Add reconnection logic — Listen for close/error events on the change stream and automatically re-establish the subscription with exponential backoff
- Check RLS policies for real-time — For Supabase, ensure the subscribing user's role has SELECT permission and the RLS policy allows reading the changed rows
- Log stream events on the server — Add logging at the change stream listener level to determine if events are received by the server but not forwarded to the client
- Monitor connection state — Add client-side indicators showing whether the real-time connection is active, so users and developers can immediately see when it drops
Real developers can help you.
Simon A.
I'm a backend developer building APIs, emulators, and interactive game systems. Professionally, I've developed Java/Spring reporting solutions, managed relational and NoSQL databases, and implemented CI/CD workflows.
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I’m a Senior Python Developer specializing in building secure, scalable, and highly available systems. I work primarily with Python, Django, FastAPI, Docker, PostgreSQL, and modern AI tooling such as PydanticAI, focusing on clean architecture, strong design principles, and reliable DevOps practices. I enjoy solving complex engineering problems and designing systems that are maintainable, resilient, and built to scale.
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I'm fronted developer with 10+ years of experience with big projects. I have small backend background too
Tejas Chokhawala
Full-stack engineer with 5 years experience building production web apps using React, Next.js and TypeScript.
Focused on performance, clean architecture and shipping fast.
Experienced with Supabase/Postgres backends, Stripe billing, and building AI-assisted developer tools.
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Milan Surelia
Milan Surelia is a Mobile App Developer with 5+ years of experience crafting scalable, cross-platform apps at 7Span and Meticha. At 7Span, he engineers feature-rich Flutter apps with smooth performance and modern UI. As the Co-Founder of Meticha, he builds open-source tools and developer-focused products that solve real-world problems.
Expertise:
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🎯 Revamped the Vepaar app into Vepaar Store & CRM with a 2x performance boost and smoother UX.
🚀 Launched Compose101 — a Jetpack Compose starter kit to speed up Android development.
🌟 Open source contributions on Github & StackOverflow for Flutter & Dart
🎖️ Worked on improving app performance and user experience with smart solutions.
Milan is always happy to connect, work on new ideas, and explore the latest in technology.
You don't need to be technical. Just describe what's wrong and a verified developer will handle the rest.
Get HelpFrequently Asked Questions
Why do MongoDB change streams require a replica set?
Change streams are built on top of the oplog (operations log), which only exists on replica sets. A standalone MongoDB instance doesn't have an oplog. For local development, start a single-node replica set: mongod --replSet rs0, then run rs.initiate() in the shell.
How do I enable real-time on a Supabase table?
Go to your Supabase dashboard > Database > Replication, and toggle on the tables you want real-time events for. Alternatively, run: ALTER PUBLICATION supabase_realtime ADD TABLE your_table_name; in the SQL editor.