[BUG] zmodel does not support calling @default(dbgenerated()) with no parameters

[clementoriol]

Description and expected behavior

Description Prisma does not support have first-class support for Postgres generated columns but they still kind of work if you :

• Write the migration yourself
• Declare them in the prisma schema as optional with @default(dbgenerated()) (see the prisma docs)

generatedField    String?                 @default(dbgenerated()) /// note the empty argument

Issue However, zmodels don't seem to allow calling dbgenerated() without arguments. Running zenstack generate with the previous example will output the following error :

missing argument for parameter "expr"

Expected behavior zmodels should allow @default(dbgenerated()) and generate the prisma schema accordingly

Environment

• ZenStack version: 2.0.2
• Prisma version: 5.10.2
• Database type: Postgresql