If you are deploying SQLite in a Node.js environment—whether on a distinct VPS, inside a Docker container, or via a stateful edge provider like Fly.io—you have likely encountered this stack trace during load testing or production spikes: SqliteError: SQLITE_BUSY: database is locked at Statement.run (node_modules/better-sqlite3/lib/methods/wrappers.js:5:11) ... This error usually creates a false dichotomy for developers: "SQLite isn't production-ready" or "I need to migrate to Postgres immediately." Neither is necessarily true. The issue is rarely SQLite itself, but rather the default configuration regarding concurrency and file locking. Here is the root cause analysis and the definitive implementation to handle high-concurrency writes in Node.js. The Root Cause: Rollback Journals and Exclusive Locks By default, SQLite uses a Rollback Journal . To write to the database in this mode, SQLite must acquire an EXCLUSIVE lock on the database file. The Lock...
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