update link registration site to executive dashboard

backend/apps/farms/migrations/0018_site_id_numeric_suffix.py

@@ -0,0 +1,93 @@
+# Append a 4-digit suffix to site ids that are still name-only slugs.
+
+import re
+import secrets
+
+from django.db import migrations, models
+import django.db.models.deletion
+from django.utils.text import slugify
+
+_HAS_SUFFIX = re.compile(r"-\d{4}$")
+
+
+def forwards_add_numeric_suffix(apps, schema_editor):
+    Site = apps.get_model("farms", "Site")
+    Kandang = apps.get_model("farms", "Kandang")
+    PusatRegistration = apps.get_model("farms", "PusatRegistration")
+
+    used = set(Site.objects.values_list("site_id", flat=True))
+    mapping: dict[str, str] = {}
+
+    for site in Site.objects.all().order_by("site_id"):
+        old = str(site.site_id)
+        if _HAS_SUFFIX.search(old):
+            continue
+        base = slugify(str(site.site_name or "").strip())[:55] or old[:55]
+        for _ in range(32):
+            candidate = f"{base}-{secrets.randbelow(10_000):04d}"
+            if candidate not in used:
+                used.add(candidate)
+                mapping[old] = candidate
+                break
+        else:
+            raise RuntimeError(f"Could not allocate numeric site id for {old}")
+
+    for old_id, new_id in mapping.items():
+        Kandang.objects.filter(site_id=old_id).update(site_id=new_id)
+        PusatRegistration.objects.filter(site_id=old_id).update(site_id=new_id)
+        Site.objects.filter(site_id=old_id).update(site_id=new_id)
+
+
+def noop_reverse(apps, schema_editor):
+    raise RuntimeError("Cannot reverse site id numeric suffix migration.")
+
+
+class Migration(migrations.Migration):
+
+    atomic = False
+
+    dependencies = [
+        ("farms", "0017_site_slug_pk"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="kandang",
+            name="site",
+            field=models.ForeignKey(
+                db_constraint=False,
+                on_delete=django.db.models.deletion.CASCADE,
+                related_name="kandangs",
+                to="farms.site",
+            ),
+        ),
+        migrations.AlterField(
+            model_name="pusatregistration",
+            name="site",
+            field=models.OneToOneField(
+                db_constraint=False,
+                on_delete=django.db.models.deletion.CASCADE,
+                related_name="pusat_registration",
+                to="farms.site",
+            ),
+        ),
+        migrations.RunPython(forwards_add_numeric_suffix, noop_reverse),
+        migrations.AlterField(
+            model_name="kandang",
+            name="site",
+            field=models.ForeignKey(
+                on_delete=django.db.models.deletion.CASCADE,
+                related_name="kandangs",
+                to="farms.site",
+            ),
+        ),
+        migrations.AlterField(
+            model_name="pusatregistration",
+            name="site",
+            field=models.OneToOneField(
+                on_delete=django.db.models.deletion.CASCADE,
+                related_name="pusat_registration",
+                to="farms.site",
+            ),
+        ),
+    ]