Double Data Storage

[found-cake]

• use persistent and temporary data storage(double storage)
• transaction
• remove batch methods

[found-cake]

After reviewing the benchmark results, I'm closing this PR due to significant performance regressions:

Performance Issues:

• Memory usage increased by 170%
• Basic Get operation performance degraded by 23%

Root Cause:
The dual storage architecture introduces unavoidable overhead from dual locking mechanisms and data duplication, which conflicts with the core principles of cache systems that prioritize speed and efficiency.

Next Steps:
I will implement the transaction functionality using the existing single database approach instead, which should maintain performance while providing the necessary transactional capabilities.