chore: gatekeeper fix race condition in SQLite DB

[Bushstar]

• Resolves: Fix race condition in Gatekeeper SQLite DB #1026

[Copilot]

Pull Request Overview

This PR addresses a race condition in the SQLite database implementation by introducing proper concurrency control mechanisms. The changes ensure database operations are executed safely in a concurrent environment through transaction management and exclusive operation execution.

• Adds a locking mechanism (runExclusive) to prevent concurrent database operations
• Wraps database operations in transactions using a new withTx helper method
• Refactors existing methods to use the new concurrency-safe patterns

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
packages/gatekeeper/src/db/sqlite.ts	Implements concurrency control with runExclusive method, transaction wrapper, and refactors all database operations to use these safety mechanisms
packages/gatekeeper/src/db/redis.ts	Removes unnecessary runExclusive wrapper from removeFromBatch method

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