The session_helpers.go file contained two unused IsExpired() methods:
- Credentials.IsExpired()
- SessionInfo.IsExpired()
These were never called anywhere in the codebase. The actual expiration
checks use:
- isCredentialExpired() in weed/s3api/auth_credentials.go (S3 auth)
- Direct time.Now().After() checks
Removing unused code improves code clarity and reduces maintenance burden.