docs: improve documentation across WebPushService class
Comprehensive documentation update focusing on clarity and completeness while
maintaining technical accuracy. Key improvements include:
- Add detailed module-level documentation with features and dependencies
- Enhance class-level documentation with responsibilities and endpoints
- Improve method documentation with:
- Clear workflow descriptions
- Technical implementation details
- Security considerations
- Database impacts
- Error handling specifics
- Usage examples
- Return type clarification
- Thread safety notes
Technical Changes:
- Replace print statements with structured logging using structlog
- Add specific error handling for SQLAlchemy and cryptography exceptions
- Add type hints and improve return type annotations
Security:
- Document authentication requirements
- Add security considerations sections
- Clarify VAPID key handling
- Document input validation
Dependencies:
- Add structlog>=24.1.0 to requirements.txt
This improves code maintainability and helps future developers understand
the system's security and operational characteristics.
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Matthew Raymer