Unable to add SkippedContent with an origin using PostgreSQL storage

Trying to add a SkippedContent object with an URL set in the origin field will result in the following piece of code being executed:

origin_ids = db.origin_id_get_by_url([cont.origin for cont in content], cur=cur)
content = [
    attr.evolve(c, origin=origin_id)
    for (c, origin_id) in zip(content, origin_ids)
]

It will fail if the origin field of any SkippedContent is set to an URL matching an existing origin because:

• db.origin_id_get_by_url() return type is List[Optional[int]]
• The origin field is defined as Optional[str].

The type mismatch result in an exception:

attrs_strict._error.AttributeTypeError: origin must be typing.Optional[str] (got 1 that is a <class 'int'>)