Knowledge Sharing of db session management optimization

[qcdyx]

Connection Pooling:
Utilize connection pooling to efficiently manage database connections and reduce overhead from establishing new connections.

Global Engine:
Introduce a global database engine to avoid redundant creation of database engines and connection pools, ensuring consistent and optimized resource usage.

Session Isolation:
Manage the session lifecycle on a per-request basis to ensure proper isolation between requests, improving stability and reducing potential issues with session conflicts.