- replace batch attribute updates with token, field, and value requests
- support parameter value updates for writable attribute groups
- support measurement mode switching and manual value updates
- record bounded measurement operation logs in PostgreSQL
- add jsonb array serialization for measurement operations
- add transaction failure context and error-chain support
- add unit tests for validation and update workflows
- replace interface{} with any across ~30 files for Go 1.18+ style
- adopt for-range-over-int loops in place of explicit index loops
- use maps.Copy from stdlib to replace manual map copy loops
- use min() builtin for exponential backoff delay cap in retry_manager
- add MongoDB 7.0 K8s manifests (StatefulSet, Service, PVC, Secret)
- document PostgreSQL and MongoDB deploy steps in deploy.md with SSH tunnel port mappings
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