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### Added - Performance and reliability improvements to balance fast-path caching and background persistence. ### Changed - Reduced DB contention and improved fast-path caching semantics for balances to provide more consistent immediate responses under load. - Withdraw fast-path: added per-key striped locking to prevent concurrent over-reservations. - Shutdown ordering: background persistence flush now runs before closing JDBC pools to guarantee pending deltas are persisted.  - Configuration: moved MySQL tuning keys into `performance.mysql` in the main `config.yml`. The plugin now prefers `performance.mysql.*` with fallbacks to `mysql.*` in `config-mysql.yml`; documentation and default configs were updated. - Added MySQL tuning options and safer defaults: background persistence batching/queueing settings and additional Hikari pool tuning keys (`leak-detection-threshold-ms`, `validation-timeout-ms`, `initialization-fail-timeout-ms`, `auto-commit`). JDBC params now include UTF-8 encoding by default. - Security: `/eco` command permissions tightened. New granular permission nodes added: `ezeconomy.eco.give`, `ezeconomy.eco.take`, `ezeconomy.eco.set`, `ezeconomy.eco.gui` (GUI opens require `ezeconomy.eco.gui`), and `ezeconomy.eco` remains the umbrella admin node. Console execution still allowed. ### Fixed - Race conditions where multiple concurrent withdraws could exceed the persisted balance. - Background flush failures during shutdown caused by closed connections. ---