Here's the `comments.py` file with Pydantic schemas for comments, to be placed in the `app/api/v1/schemas/` directory:

from typing import Optional
from pydantic import BaseModel
from datetime import datetime

class CommentBase(BaseModel):
    content: str

class CommentCreate(CommentBase):
    pass

class CommentUpdate(CommentBase):
    pass

class CommentInDBBase(CommentBase):
    id: int
    post_id: int
    created_at: datetime
    updated_at: Optional[datetime] = None

    class Config:
        orm_mode = True

class Comment(CommentInDBBase):
    pass

class CommentInDB(CommentInDBBase):
    pass

Here's a breakdown of the file:

1. We import the necessary modules: `typing` for type hints, `pydantic` for defining data models, and `datetime` for working with date and time objects.




5. `CommentInDBBase` inherits from `CommentBase` and adds fields for the comment's ID (`id`), the associated post ID (`post_id`), the creation timestamp (`created_at`), and an optional update timestamp (`updated_at`). The `Config` class is used to enable the `orm_mode` for compatibility with SQLAlchemy models.