+generate DynamoDB data generate_dynamo_data.py

[ivma1-nhs]

Description

Refactored and modularised the JSON test data generator to align with SOLID principles. Introduced class-based structure for date variable resolution and JSON placeholder substitution. Centralised date formatting logic and added structured logging for traceability.

Context

The previous script lacked structure and reusability, and hardcoded the date format in multiple places. This change provides a cleaner, testable, and maintainable utility for resolving dynamic date placeholders like <<DATE_AGE_75>> or <<DATE_DAY_-7>> within test data files. The output format is now standardised and easier to audit.

Type of changes

• Refactoring (non-breaking change)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would change existing functionality)
• Bug fix (non-breaking change which fixes an issue)

Checklist

• I am familiar with the contributing guidelines
• I have followed the code style of the project
• I have added tests to cover my changes
• I have updated the documentation accordingly
• This PR is a result of pair or mob programming

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• I confirm that neither PII/PID nor sensitive data are included in this PR and the codebase changes.