Replit
database
SQLite Database Locked on Replit
SQLite database is locked and transactions timeout. Multiple processes are trying to write simultaneously, causing lock contention.
SQLite isn't designed for concurrent writes like PostgreSQL, making it unsuitable for Replit's multi-process environment.
Error Messages You Might See
database is locked
Database file is locked
Timeout waiting for database lock
SQLite error 5: database is locked
Common Causes
- Multiple Replit instances writing to same SQLite file simultaneously
- Long-running transactions holding locks
- WAL mode not enabled for SQLite
- Timeout set too low for concurrent operations
- SQLite used instead of proper database like PostgreSQL
How to Fix It
Switch to PostgreSQL (Replit's built-in option) for production. If you must use SQLite, enable WAL mode and increase transaction timeout. Ensure only one process writes to SQLite at a time. Avoid SQLite entirely for deployed Replit apps.
Real developers can help you.
hanson1014
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Day job: I'm the sole backend developer at merketing company where I own and maintain 11 PHP/Symfony microservices on AWS (ECS Fargate, RDS, S3, CloudFront), handle the full CI/CD pipeline (Bitbucket Pipelines, Docker), and manage monitoring with Sentry and CloudWatch. These services handle high request volumes in production every month.
What I bring to AI-built apps:
- I audit and fix security issues (OWASP methodology), performance bottlenecks, and architectural problems in codebases generated by Cursor, Claude Code, Lovable, Bolt, and v0
- I refactor AI-generated prototypes into production-grade applications with proper error handling, testing, and clean architecture (SOLID, DDD, hexagonal architecture)
- I set up the infrastructure AI tools don't touch: AWS hosting, CI/CD pipelines, automated deployments, database optimization, monitoring, and alerting
- I integrate external services: payment providers, email systems, partner APIs, SSO/auth
Tech stack: PHP 8.x, Symfony, React, Next.js, PostgreSQL, MySQL, Docker, AWS (ECS, RDS, S3, SQS/SNS, CloudFront), Terraform, Supabase. I also use AI tools daily (Claude Code, Cursor) in my own workflow, so I understand both the strengths and the gaps in AI-generated code.
Based in Poland (CET timezone). Available for async work and calls during EU/US business hours.
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PawelPloszaj
I'm fronted developer with 10+ years of experience with big projects. I have small backend background too
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 is SQLite bad for Replit?
SQLite can't handle multiple concurrent writers. Replit deployments scale to multiple instances, causing lock contention
Should I enable WAL mode?
WAL helps but doesn't solve the underlying concurrency issue. Use PostgreSQL instead