from django.db import migrations, models


class Migration(migrations.Migration):
    """
    DB already has event_name (NOT NULL) from an earlier manual/out-of-band change.
    Sync Django state and ensure NULLs become empty string so inserts never omit the column.
    """

    dependencies = [
        ('accounting', '0008_invoice_cancelled_status'),
    ]

    operations = [
        migrations.SeparateDatabaseAndState(
            state_operations=[
                migrations.AddField(
                    model_name='treasurytxn',
                    name='event_name',
                    field=models.CharField(blank=True, default='', max_length=200),
                ),
            ],
            database_operations=[
                migrations.RunSQL(
                    sql="UPDATE accounting_treasury_txns SET event_name = '' WHERE event_name IS NULL;",
                    reverse_sql=migrations.RunSQL.noop,
                ),
            ],
        ),
    ]