Complete sample code for demonstrating common db caching strats

[maronavenue]

Implement fully working db caching strategies in a minimalist app. Better if pros and cons can be simulated through the actual code. At run-time. Consider architecting best practices and performance implications.

Sample codes for the ff:

1. Lazy-loading
2. Write-through
3. Hybrid

Notes:

• How to incorporate TTL in a pragmatic example?
• Quick guide in: https://docs.aws.amazon.com/AmazonElastiCache/latest/mem-ug/Strategies.html