- Add pkg/mining/manager_race_test.go with concurrent miner tests
- Add pkg/database/database_race_test.go with concurrent DB tests
- Add TestCleanupRetention, TestGetHashrateHistoryTimeRange tests
- Add TestMultipleMinerStats, TestIsInitialized tests
- Fix AVG() float64 to int scan error in GetHashrateStats
- Fix AVG() float64 to int scan error in GetAllMinerStats
- Fix throttle tests to use NewManagerForSimulation to avoid
autostart conflicts
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>