Refactor: Revert PebbleDB tuning and simplify preupdate hook
- Revert PebbleDB tuning options (bloom filters, WAL sync intervals,
table cache shards) that were causing cluster instability
- Simplify preupdate hook implementation
- Add schema cache for better column metadata handling
- Consolidate test files for hook capture and row processing
- Remove unused conflict detection test file
- Clean up coordinator handler and transaction code
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Co-Authored-By: Claude Opus 4.5 <
[email protected]>
