1from plain import models
 2
 3
 4@models.register_model
 5class Session(models.Model):
 6    session_key = models.CharField(max_length=40)
 7    session_data = models.JSONField(default=dict, required=False)
 8    created_at = models.DateTimeField(auto_now_add=True)
 9    expires_at = models.DateTimeField(allow_null=True)
10
11    model_options = models.Options(
12        indexes=[
13            models.Index(fields=["expires_at"]),
14        ],
15        constraints=[
16            models.UniqueConstraint(fields=["session_key"], name="unique_session_key")
17        ],
18    )
19
20    def __str__(self) -> str:
21        return self.session_key