Add multi-tenancy to an existing ASP.NET Core application

Tenantry Core enables multi-tenancy in ASP.NET Core applications using EF Core and PostgreSQL, ensuring tenant isolation by applying filters to queries and saves. Simultaneously, managing connection pool exhaustion in high-traffic APIs is critical. Tuning MaxPoolSize, implementing short ConnectionTimeouts, and utilizing Polly retry or circuit-breaker logic prevent bottlenecks. Without these optimizations, services facing 5 kRPS against Azure SQL risk thread-pool exhaustion and cascading failures, turning fast queries into timeouts and resulting in widespread 503 errors.