a15cc5971f
- Improved schema isolation logic with constants for tenant schemas and search path management in PostgreSQL. - Added `withTenant` utility in `TenantContextHolder` to simplify tenant context usage. - Removed unused imports, variables, and helper functions (`random()` and redundant `NennungRepository` references). - Included missing `multitenancy.*` configuration keys in `additional-spring-configuration-metadata.json` to address IDE warnings.