- Updated `publishCacheEvents` to utilize multiple concurrent connections for event publishing.
- Introduced worker-based architecture leveraging `runtime.NumCPU` for parallel uploads.
- Optimized database fetch logic in `FetchEventsBySerials` for improved maintainability and performance.
- Bumped version to `v0.4.8`.
- Removed `bufpool` usage throughout `tag`, `tags`, and `event` packages for memory efficiency.
- Replaced in-place buffer modifications with independent, deep-copied allocations to prevent unintended mutations.
- Added new `Clone` method for deep copying `event.E`.
- Ensured valid JSON emission for nil `Tags` in `event` marshaling.
- Introduced `cmd/stresstest` for relay stress-testing with detailed workload generation and query simulation.