# Adds Line.admin_solicited (BooleanField) to discriminate
# system-authored Lines (Note.grant_if_new) from user writes on
# NOTE_UNLOCK Posts. The post_save signal nukes any Line on a
# NOTE_UNLOCK Post that lacks admin_solicited=True — defense-in-depth
# alongside the view_post POST guard. Backfill: existing NOTE_UNLOCK
# Lines (the only system-authored kind at this point) get True; all
# others default False.

from django.db import migrations, models


def backfill(apps, schema_editor):
    Line = apps.get_model("billboard", "Line")
    Line.objects.filter(post__kind="note_unlock").update(admin_solicited=True)


def reverse_noop(apps, schema_editor):
    pass


class Migration(migrations.Migration):

    dependencies = [
        ("billboard", "0004_post_title_line_author_created_at"),
    ]

    operations = [
        migrations.AddField(
            model_name="line",
            name="admin_solicited",
            field=models.BooleanField(default=False),
        ),
        migrations.RunPython(backfill, reverse_noop),
    ]