Some applications use a database which is shared by multiple applications, and you are not allowed to change the models (i.e. you can't ALTER TABLE). You code y

Some applications use a database which is shared by multiple applications, and you are not allowed to change the models (i.e. you can't ALTER TABLE). You code your application knowing that data can be changed by others. Your application coordinates with other applications through the database. Using separate services that each have their own database is not required and incurs overhead.