Database-per-User Architecture With a Single App Layer: How and Why

This text discusses the Database-per-User Architecture with a Single App Layer for designing and implementing SaaS projects. It presents two main strategies, shared application environment and isolated application environments, each having their own advantages and disadvantages. The article focuses on the former strategy, which is more familiar and simple to design and manage. However, it also highlights that this approach limits the flexibility offered to users. The text delves into various aspects of deploying a single app environment, such as user authentication, catalog database usage, control plane implementation, and schema upgrade management. It emphasizes the importance of maintaining a consistent schema version across all databases in a shared-environment strategy. The article concludes by acknowledging that while this approach simplifies operations, it doesn't eliminate complexity entirely.