Greptile Summary

This PR adds SQLAlchemy database connection pool configuration options to Reflex through environment variables. The changes introduce four new configurable parameters in the EnvironmentVariables class: SQLALCHEMY_POOL_SIZE (default 5), SQLALCHEMY_MAX_OVERFLOW (default 10), SQLALCHEMY_POOL_RECYCLE (default -1), and SQLALCHEMY_POOL_TIMEOUT (default 30). These environment variables are then consumed in the get_engine_args() function within model.py to configure both synchronous and asynchronous SQLAlchemy engines.

The implementation follows Reflex's existing pattern of using the EnvVar system for configuration management, allowing these database connection pool settings to be overridden via environment variables while providing sensible defaults that match SQLAlchemy's standard behavior. This enhancement enables production deployments to tune their database connection pools based on specific load characteristics, database server capabilities, and deployment environment constraints without requiring code modifications.

The changes integrate seamlessly with Reflex's existing database abstraction layer and maintain backward compatibility by using default values that preserve current behavior when the environment variables are not set.

Confidence score: 5/5

• This PR is safe to merge with minimal risk as it only adds new configuration options with sensible defaults
• Score reflects simple additive changes that follow established patterns and maintain backward compatibility
• No files require special attention as the changes are straightforward and well-contained

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