OAuthAccount.expires_at should be BigInteger

[holtgrewe]

Describe the bug

The OAuthAccount.expires_at field is an Integer. If your OAuth2 provider decides to give you a value in 2043 (as ORCID sandbox does) then this cannot be inserted into the database any more.

To Reproduce

Steps to reproduce the behavior:

1. Setup fastapi-users with OAuth2.
2. Authenticate with a provider who returns a sufficiently large expires_at value.
3. Database insert will fail.

Expected behavior

Dates in 2043 should work.

Configuration

• Python version : 3.11
• FastAPI version : 0.103.1
• FastAPI Users version : 12.1.2

FastAPI Users configuration

N/A

Additional context

N/A

[frankie567]

Good catch, indeed! PR welcome on fastapi-users-db-sqlalchemy :)