Summary

• Avoid NonUniqueResultException when duplicate Google social users already exist in the database
• Query all matching Google social users ordered by newest user id and continue login with the newest account
• Log duplicate count so production cleanup is visible

Validation

• ./gradlew compileJava compileTestJava test --tests devkor.ontime_back.global.jwt.JwtTokenProviderTest --tests devkor.ontime_back.controller.UserAuthControllerTest

Note

• This prevents login from crashing with existing duplicate rows, but the duplicate database rows should still be cleaned up separately.