migrate site id to varchar instead of int

backend/apps/sync/models.py

@@ -20,7 +20,7 @@ class ActiveSite(models.Model):
         blank=True,
         default="",
         db_index=True,
-        help_text="Farm-location Site.site_id (slug) from the registering dashboard",
+        help_text="Farm-location Site.site_id (slug); equals HQ sites.site_id when claimed",
     )
     api_base_url = models.URLField(
         max_length=255,

backend/apps/sync/tests_register.py

@@ -149,6 +149,7 @@ class ClaimActiveSiteTests(TestCase):
         self.active = ActiveSite.objects.create(
             code="sukawarna",
             name="Sukawarna",
+            source_site_id="sukawarna-0001",
             api_base_url="https://sukawarna.example/api/v1",
             api_key="site-secret",
             managed_by=None,
@@ -164,7 +165,18 @@ class ClaimActiveSiteTests(TestCase):
         self.assertEqual(response.status_code, 200, response.data)
         self.active.refresh_from_db()
         self.assertEqual(self.active.managed_by_id, self.gm.pk)
-        self.assertTrue(Site.objects.filter(active_site=self.active, user=self.gm).exists())
+        hq = Site.objects.get(active_site=self.active, user=self.gm)
+        self.assertEqual(hq.pk, "sukawarna-0001")
+        self.assertEqual(hq.site_id, self.active.source_site_id)
+
+    def test_claimed_site_api_id_is_farm_slug_string(self):
+        self.client.force_authenticate(self.gm)
+        self.client.post("/api/v1/active-sites/", {"code": "sukawarna"}, format="json")
+        listed = self.client.get("/api/v1/sites/")
+        self.assertEqual(listed.status_code, 200)
+        row = next(r for r in listed.data["results"] if r["site_name"] == "Sukawarna")
+        self.assertEqual(row["id"], "sukawarna-0001")
+        self.assertIsInstance(row["id"], str)
 
     def test_claim_unknown_code_404(self):
         self.client.force_authenticate(self.gm)
@@ -191,7 +203,10 @@ class ClaimActiveSiteTests(TestCase):
         self.active.source_site_id = "sukawarna-0001"
         self.active.save(update_fields=["managed_by", "source_site_id"])
         hq_site = Site.objects.create(
-            site_name="Sukawarna", user=self.gm, active_site=self.active
+            site_id="sukawarna-0001",
+            site_name="Sukawarna",
+            user=self.gm,
+            active_site=self.active,
         )
         self.client.force_authenticate(self.gm)
         response = self.client.delete(f"/api/v1/active-sites/{self.active.pk}/")