Address review feedback: Update GRIP syntax, add restore functionality, improve documentation

[Copilot]

This PR addresses all review feedback from the backup-service implementation, making the service production-ready with comprehensive backup and restore capabilities.

Key Changes

🔧 GRIP Query Language Updates

Updated to use the latest gripql syntax compatible with PyPI version:

• Removed deprecated .query() syntax from all GRIP operations
• Changed G.query().V() → G.V() and G.query().E() → G.E()
• Fixed GRIP restore function to use proper directory paths instead of hardcoded files

🔄 Enhanced Restore Functionality

Added full restore capability to match backup functionality:

• Enhanced entrypoint.sh to support both backup and restore operations
• Added OPERATION environment variable to control mode (backup/restore)
• Added RESTORE_DIR environment variable for restore operations
• Maintains backward compatibility (defaults to backup mode)

📚 Comprehensive Documentation Updates

Improved README with deployment and configuration guidance:

• Added deployment section with helm-charts repository link
• Added configuration section documenting all environment variables
• Added best practices section covering:
  • Namespace configuration recommendations
  • Secret management (reusing existing postgresql secrets)
  • Performance considerations (removing query limits for production)
  • Global configuration via helm values

Addresses Review Feedback

• Deployment clarity: Added helm-charts link and deployment instructions
• Space efficiency: Documented backup retention strategies for long-term storage management
• Secret management: Documented approach to reuse existing local-postgresql secret instead of creating separate PGPASSWORD secret
• Helm integration: Documented configuration through helm values and secrets files for streamlined deployment
• Restore capability: Restore jobs are now as easy to run as backup jobs using kubectl
• Configuration best practices: Documented removing hardcoded limits and using global helm config
• Namespace guidance: Provided recommendations for namespace deployment strategies

Testing

• All existing tests pass (4 passed, 3 skipped)
• GRIP functionality validated with updated syntax
• Entrypoint script tested for both backup and restore modes
• CLI interface maintains full backward compatibility
• Error handling validated for invalid operation modes

Example Usage

# Create a backup job (existing functionality)
kubectl create job backup-job --from=cronjob/backup-service-cronjob --namespace backups

# Create a restore job (new functionality)
kubectl create job restore-job --from=cronjob/backup-service-cronjob --namespace backups
# Note: Set OPERATION=restore environment variable in job spec

The changes are minimal and surgical, addressing all reviewer concerns while maintaining full backward compatibility.

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