Advisory packages uniq

Added uniq constraint to UpdateRecordPackage
Added rpm-datarepair command to deduplicate UpdateCollectionPackages if duplicates already in DB.

closes: pulp#2754
pulp#2754

CHANGES/2754.bugfix

@@ -0,0 +1 @@
+Added unique constraint for advisory collection packages. Added data repair command in case any duplicates already exists  ``pulpcore-manager rpm-datarepair 2754``.

pulp_rpm/app/management/commands/rpm-datarepair.py

@@ -2,7 +2,7 @@
 
 from django.core.management import BaseCommand, CommandError
 
-from pulp_rpm.app.models import Package  # noqa
+from pulp_rpm.app.models import Package, UpdateCollectionPackage  # noqa
 
 
 class Command(BaseCommand):
@@ -22,6 +22,8 @@ def handle(self, *args, **options):
 
         if issue == "2460":
             self.repair_2460()
+        elif issue == "2754":
+            self.repair_2754()
         else:
             raise CommandError(_("Unknown issue: '{}'").format(issue))
 
@@ -45,3 +47,27 @@ def fix_requirement(require):
         for package in packages:
             fix_package(package)
             package.save()
+
+    def repair_2754(self):
+        """Perform datarepair for issue #2754."""
+
+        duplicate_pks = set()
+
+        for ucp in UpdateCollectionPackage.objects.all():
+            q = UpdateCollectionPackage.objects.filter(
+                name=ucp.name,
+                epoch=ucp.epoch,
+                version=ucp.version,
+                release=ucp.release,
+                arch=ucp.arch,
+                filename=ucp.filename,
+                update_collection=ucp.update_collection,
+            )
+            if len(q) > 1:
+                for pkg in q[1:]:
+                    duplicate_pks.add(pkg.pk)
+
+        if input(
+            f"Are you sure to remove {len(duplicate_pks)} duplicated advisory packages? (y/N) "
+        ) in ["Y", "y"]:
+            UpdateCollectionPackage.objects.filter(pk__in=duplicate_pks).delete()

pulp_rpm/app/migrations/0046_alter_updatecollectionpackage_unique_together.py

@@ -0,0 +1,17 @@
+# Generated by Django 3.2.15 on 2022-09-09 08:29
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("rpm", "0045_noartifact_modules"),
+    ]
+
+    operations = [
+        migrations.AlterUniqueTogether(
+            name="updatecollectionpackage",
+            unique_together={("name", "epoch", "version", "release", "arch", "update_collection")},
+        ),
+    ]

pulp_rpm/app/models/advisory.py

@@ -387,6 +387,9 @@ class UpdateCollectionPackage(BaseModel):
         UpdateCollection, related_name="packages", on_delete=models.CASCADE
     )
 
+    class Meta:
+        unique_together = ("name", "epoch", "version", "release", "arch", "update_collection")
+
     @classmethod
     def createrepo_to_dict(cls, package):
         """