PostgresDsn fails for multiple hosts

The original issue is described here: pydantic/pydantic#7295

Project dependencies

Main dependencies are described in pyproject.toml file.

I also use these tools to start the project:

The current state of the project is running finely, without any issue, because it uses this notation of multihost connection:

export POSTGRES_DSN=postgresql+psycopg://user:password@/database?host=0.0.0.0:5432&host=0.0.0.0:5432&target_session_attrs=read-write

You can see it at the top of Makefile. The problem is that I cannot validate this string with pydantic.PostgresDsn typing hint.

If you comment this line and uncomment another one with Pydantic notation, then neither Alembic nor SQLAlchemy will work:

export POSTGRES_DSN=postgresql+psycopg://user:password@0.0.0.0:5432,0.0.0.0:5432/database&target_session_attrs=read-write

That's the crux of the issue.