Based on the research and GitHub issues, I can provide some guidance on SQLite issues with Prefect. Here are the key points and solutions: 1. Performance Optimization If you're experiencing slowness or lock issues with SQLite, you can optimize your SQLite configuration with these recommended PRAGMA settings:

sql
PRAGMA journal_mode = WAL;           -- Enable Write-Ahead Logging
PRAGMA busy_timeout = 5000;          -- Wait up to 5 seconds before SQLITE_BUSY errors
PRAGMA synchronous = NORMAL;         -- Better performance while maintaining safety
PRAGMA cache_size = -20000;          -- Use 20MB memory cache
PRAGMA foreign_keys = true;          -- Enable foreign key support
PRAGMA temp_store = memory;          -- Store temp tables in RAM

2. Common Issues and Solutions: - Database Locks: If you're experiencing database locks, ensure you're not running multiple write operations simultaneously. SQLite works best with a single writer. - Missing Indexes: Sometimes indexes might not migrate properly. You may need to manually create missing indexes if you experience performance issues. - Connection Issues: For deployment-related SQLite issues, ensure proper file permissions and that the database file is accessible from your deployment location. 3. Best Practices: - For production environments with multiple concurrent users or heavy workloads, consider using PostgreSQL instead of SQLite - If you must use SQLite, implement connection pooling with separate pools for reads and writes - Keep the write connection pool limited to 1 connection to avoid lock conflicts - Set appropriate timeouts to handle busy conditions 4. Specific to Prefect 3.x: - Prefect includes utilities to handle UUID generation and JSON operations in SQLite - The server configuration can be customized through environment variables or configuration files - Make sure your SQLite version is up to date (3.31.1 or newer recommended) If you're experiencing a specific SQLite issue, could you please provide more details about: 1. The exact error message you're seeing 2. Your deployment configuration 3. The scale of your deployment (number of flows, concurrent runs, etc.) This would help me provide more targeted assistance for your specific situation.