1from __future__ import annotations
 2
 3from datetime import datetime
 4
 5from plain import models
 6from plain.models import types
 7
 8__all__ = ["Session"]
 9
10
11@models.register_model
12class Session(models.Model):
13    session_key: str = types.CharField(max_length=40)
14    session_data: dict = types.JSONField(default=dict, required=False)
15    created_at: datetime = types.DateTimeField(auto_now_add=True)
16    expires_at: datetime | None = types.DateTimeField(allow_null=True)
17
18    query: models.QuerySet[Session] = models.QuerySet()
19
20    model_options = models.Options(
21        indexes=[
22            models.Index(fields=["expires_at"]),
23        ],
24        constraints=[
25            models.UniqueConstraint(fields=["session_key"], name="unique_session_key")
26        ],
27    )
28
29    def __str__(self) -> str:
30        return self.session_key