Bug: [default: `now()`] fails, while [default: 'now()'] works fine

[DimitrijeGlibic]

Hi, I have this dbml code that I am trying to parse but it fails:

Table users {
  id integer [primary key]
  username varchar [not null]
  email varchar [unique, not null]
  created_at timestamp [default: `now()`]
}

It seems that the problem is in [default: now()] or to be more precise in backtick character ` so when I switch to single quote character instead of backtick it works fine. So this actually works:

Table users {
  id integer [primary key]
  username varchar [not null]
  email varchar [unique, not null]
  created_at timestamp [default: 'now()']
}

The only difference is that I have replaced backticks (`) with single quotes (').

I am using pydbml~=1.2.1, and this is example of implementation: https://github.com/scafoldr/scafoldr/blob/add-code-generator-page/core/src/core/scafoldr_schema/dbml_scafoldr_schema_maker.py , also I am using it here to validate DBML code generated from the ai agent: https://github.com/scafoldr/scafoldr/blob/3a0ce328c66fd9f22c15eea93a45db539fe7291e/core/src/core/dbml_ai_assistant/dbml_ai_agent.py#L97

Also I have checked in DBML docs and using backticks (`) seems to be valid syntax.