Meta indexes and makemigrations

Hello,

We want to have a partial index (db backend is Postgres) on a datetimefield, so we added this code to the Meta class:

class Episode(models.Model):

    channel_type = models.CharField(max_length=16, choices=CHANNEL_TYPES)

    last_seen_date = models.DateTimeField(auto_now_add=True)

    class Meta:
        indexes = [
            models.Index(
                name="ch_last_seen_date",
                fields=["last_seen_date"],
                condition=models.Q(channel_type="42"),
            ),
        ]

The problem is that makemigrations doesn't seem to recognize it.

What could be the problem? We're on Django 3.2, which I know is old but as per the documentation this should be fine..

Thanks

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