Deployment Script, Postgres migration, UX improvements

backend/tests/test_costing_engine.py

@@ -344,6 +344,41 @@ def test_mix_calculator_endpoints_respect_owner_visibility():
         assert operator_detail_response.status_code == 404
 
 
+def test_mix_calculator_pdf_endpoint_returns_pdf():
+    with TestClient(app) as client:
+        superadmin_login = client.post(
+            "/api/auth/client/login",
+            json={"email": settings.client_email, "password": settings.client_password},
+        )
+        headers = {"Authorization": f"Bearer {superadmin_login.json()['token']}"}
+
+        options_response = client.get("/api/mix-calculator/options", headers=headers)
+        seeded_product = next(
+            product for product in options_response.json()["products"] if product["product_name"] == "Specialty Pigeon Breeder 20kg"
+        )
+
+        create_response = client.post(
+            "/api/mix-calculator",
+            json={
+                "mix_date": "2026-04-29",
+                "client_name": seeded_product["client_name"],
+                "product_id": seeded_product["product_id"],
+                "batch_size_kg": 560,
+                "prepared_by_name": "Amelia Hart",
+                "notes": "Morning production run",
+            },
+            headers=headers,
+        )
+        created = create_response.json()
+
+        pdf_response = client.get(f"/api/mix-calculator/{created['id']}/pdf", headers=headers)
+
+        assert pdf_response.status_code == 200
+        assert pdf_response.headers["content-type"] == "application/pdf"
+        assert "attachment;" in pdf_response.headers["content-disposition"]
+        assert pdf_response.content.startswith(b"%PDF")
+
+
 def test_module_permission_blocks_client_module_access():
     with TestClient(app) as client:
         admin_login_response = client.post(