membershipworks: Remove DB constraints for FKs to Members table

MariaDB doesn't support partitions on tables with FKs, and performance
of the Members table has become unusable due to size caused by system
versioning

membershipworks/migrations/0004_alter_memberflag_member_alter_transaction_member.py

@@ -0,0 +1,36 @@
+# Generated by Django 5.0 on 2023-12-26 17:46
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("membershipworks", "0003_alter_transaction_sid"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="memberflag",
+            name="member",
+            field=models.ForeignKey(
+                db_column="uid",
+                db_constraint=False,
+                on_delete=django.db.models.deletion.PROTECT,
+                to="membershipworks.member",
+            ),
+        ),
+        migrations.AlterField(
+            model_name="transaction",
+            name="member",
+            field=models.ForeignKey(
+                blank=True,
+                db_column="uid",
+                db_constraint=False,
+                null=True,
+                on_delete=django.db.models.deletion.PROTECT,
+                related_name="transactions",
+                to="membershipworks.member",
+            ),
+        ),
+    ]

membershipworks/models.py

@@ -259,7 +259,9 @@ class Member(BaseModel):
 
 
 class MemberFlag(BaseModel):
-    member = models.ForeignKey(Member, on_delete=models.PROTECT, db_column="uid")
+    member = models.ForeignKey(
+        Member, on_delete=models.PROTECT, db_column="uid", db_constraint=False
+    )
     flag = models.ForeignKey(Flag, on_delete=models.PROTECT)
 
     def __str__(self):
@@ -280,6 +282,7 @@ class Transaction(BaseModel):
         Member,
         on_delete=models.PROTECT,
         db_column="uid",
+        db_constraint=False,
         related_name="transactions",
         null=True,
         blank=True,