Cascade project_events deletion (#9063)

Co-authored-by: Ee W. Durbin III <[email protected]>

Author: di

warehouse/migrations/versions/69b928240b2f_cascade_project_events_deletion.py

@@ -0,0 +1,52 @@
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""
+Cascade project_events deletion
+
+Revision ID: 69b928240b2f
+Revises: 99a201142761
+Create Date: 2021-02-08 21:45:22.759363
+"""
+
+from alembic import op
+
+revision = "69b928240b2f"
+down_revision = "99a201142761"
+
+
+def upgrade():
+    op.drop_constraint(
+        "project_events_project_id_fkey", "project_events", type_="foreignkey"
+    )
+    op.create_foreign_key(
+        None,
+        "project_events",
+        "projects",
+        ["project_id"],
+        ["id"],
+        ondelete="CASCADE",
+        initially="DEFERRED",
+        deferrable=True,
+    )
+
+
+def downgrade():
+    op.drop_constraint(None, "project_events", type_="foreignkey")
+    op.create_foreign_key(
+        "project_events_project_id_fkey",
+        "project_events",
+        "projects",
+        ["project_id"],
+        ["id"],
+        initially="DEFERRED",
+        deferrable=True,
+    )

warehouse/packaging/models.py

@@ -272,7 +272,9 @@ class ProjectEvent(db.Model):
 
     project_id = Column(
         UUID(as_uuid=True),
-        ForeignKey("projects.id", deferrable=True, initially="DEFERRED"),
+        ForeignKey(
+            "projects.id", deferrable=True, initially="DEFERRED", ondelete="CASCADE"
+        ),
         nullable=False,
     )
     tag = Column(String, nullable=False)