- Show custom_instance_pg_databases, ducklake_settings, ducklake_user_pg_pwd
and rsa_keys in frontend YAML editor (remove from excludedKeys)
- Redact sensitive values: add ducklake_user_pg_pwd and rsa_keys to
sensitiveKeys, add custom_instance_pg_databases.user_pwd to
nestedSensitiveFields
- Remove rsa_keys from HIDDEN_SETTINGS so it appears in YAML export
- Hide automate_username_creation from export (add to HIDDEN_SETTINGS)
- Add ducklake_user_pg_pwd and rsa_keys to SENSITIVE_SETTINGS for log
redaction
- Generalize empty/null protection for all PROTECTED_SETTINGS: operator
diff skips empty values when DB has existing data, direct API rejects
delete/empty for protected settings
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>