Implement Data Persistence & Database Module

[akargi]

Description

Create a comprehensive data persistence module that provides reliable storage, query capabilities, and data consistency for the entire application. This module manages all database interactions and ensures ACID compliance where needed.

Direction

This module should provide:

• Transaction support with ACID guarantees
• Optimized query patterns for common operations
• Data migration and versioning support
• Backup and disaster recovery mechanisms
• Connection pooling and performance optimization
• Data validation and constraints
• Audit trail for sensitive operations
• Support for sharding and horizontal scaling

Acceptance Criteria

• All data is persisted with ACID guarantees
• Query performance is optimized with proper indexing
• Database migrations are version-controlled and testable
• Backups are automated and verified regularly
• Disaster recovery RPO < 5 minutes, RTO < 15 minutes
• Connection pooling reduces latency by >40%
• Data constraints prevent invalid state
• Audit trail captures all modifications to sensitive data
• Sharding strategy supports 10x growth without redesign
• Unit and load tests validate performance targets
• Documentation includes schema diagrams and ER models

[Dev-Zully]

Hello maintainer am a backend developer please assign me this issue

[grantfox-oss]

🦊 GrantFox — @Dev-Zully has been assigned to this issue as part of the Official Campaign | FWC26 campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #12)
2. Your PR will be reviewed by the Chulilee maintainers

Good luck! Track your progress on GrantFox.