lib.itmens/journal/migrations/0020_shelflogentry_unique_shelf_log_entry.py

# Generated by Django 4.2.7 on 2023-11-23 03:23

from django.db import migrations, models

_sql = """DELETE
FROM journal_shelflogentry a USING journal_shelflogentry b
WHERE a.ctid < b.ctid
    AND a.item_id=b.item_id
    AND a.owner_id=b.owner_id
    AND a.timestamp=b.timestamp
    AND a.shelf_type=b.shelf_type"""


class Migration(migrations.Migration):
    dependencies = [
        ("journal", "0019_alter_collection_edited_time_and_more"),
    ]

    operations = [
        migrations.RunSQL("SET CONSTRAINTS ALL IMMEDIATE;"),
        migrations.RunSQL(
            sql=_sql,
            reverse_sql=migrations.RunSQL.noop,
        ),
        migrations.RunSQL("SET CONSTRAINTS ALL DEFERRED;"),
        migrations.AddConstraint(
            model_name="shelflogentry",
            constraint=models.UniqueConstraint(
                fields=("owner", "item", "timestamp", "shelf_type"),
                name="unique_shelf_log_entry",
            ),
        ),
    ]