diff --git a/epapi/tests/v1/test_additional_information.py b/epapi/tests/v1/test_additional_information.py
new file mode 100644
index 00000000..d8c19b25
--- /dev/null
+++ b/epapi/tests/v1/test_additional_information.py
@@ -0,0 +1,420 @@
+"""
+Tests for Additional Information API endpoints.
+
+Tests CRUD operations on scenario additional information including the new PATCH endpoint.
+"""
+
+from django.test import TestCase, tag
+import json
+from uuid import uuid4
+
+from epdb.logic import PackageManager, UserManager
+from epdb.models import Scenario
+
+
+@tag("api", "additional_information")
+class AdditionalInformationAPITests(TestCase):
+    """Test additional information API endpoints."""
+
+    @classmethod
+    def setUpTestData(cls):
+        """Set up test data: user, package, and scenario."""
+        cls.user = UserManager.create_user(
+            "ai-test-user",
+            "ai-test@envipath.com",
+            "SuperSafe",
+            set_setting=False,
+            add_to_group=False,
+            is_active=True,
+        )
+        cls.other_user = UserManager.create_user(
+            "ai-other-user",
+            "ai-other@envipath.com",
+            "SuperSafe",
+            set_setting=False,
+            add_to_group=False,
+            is_active=True,
+        )
+        cls.package = PackageManager.create_package(
+            cls.user, "AI Test Package", "Test package for additional information"
+        )
+        # Package owned by other_user (no access for cls.user)
+        cls.other_package = PackageManager.create_package(
+            cls.other_user, "Other Package", "Package without access"
+        )
+        # Create a scenario for testing
+        cls.scenario = Scenario.objects.create(
+            package=cls.package,
+            name="Test Scenario",
+            description="Test scenario for additional information tests",
+            scenario_type="biodegradation",
+            scenario_date="2024-01-01",
+            additional_information={},  # Initialize with empty dict
+        )
+        cls.other_scenario = Scenario.objects.create(
+            package=cls.other_package,
+            name="Other Scenario",
+            description="Scenario in package without access",
+            scenario_type="biodegradation",
+            scenario_date="2024-01-01",
+            additional_information={},
+        )
+
+    def test_list_all_schemas(self):
+        """Test GET /api/v1/information/schema/ returns all schemas."""
+        self.client.force_login(self.user)
+
+        response = self.client.get("/api/v1/information/schema/")
+
+        self.assertEqual(response.status_code, 200)
+        data = response.json()
+        self.assertIsInstance(data, dict)
+        # Should have multiple schemas
+        self.assertGreater(len(data), 0)
+        # Each schema should have RJSF format
+        for name, schema in data.items():
+            self.assertIn("schema", schema)
+            self.assertIn("uiSchema", schema)
+            self.assertIn("formData", schema)
+            self.assertIn("groups", schema)
+
+    def test_get_specific_schema(self):
+        """Test GET /api/v1/information/schema/{model_name}/ returns specific schema."""
+        self.client.force_login(self.user)
+
+        # Assuming 'temperature' is a valid model
+        response = self.client.get("/api/v1/information/schema/temperature/")
+
+        self.assertEqual(response.status_code, 200)
+        data = response.json()
+        self.assertIn("schema", data)
+        self.assertIn("uiSchema", data)
+
+    def test_get_nonexistent_schema_returns_404(self):
+        """Test GET for non-existent schema returns 404."""
+        self.client.force_login(self.user)
+
+        response = self.client.get("/api/v1/information/schema/nonexistent/")
+
+        self.assertEqual(response.status_code, 404)
+
+    def test_list_scenario_information_empty(self):
+        """Test GET /api/v1/scenario/{uuid}/information/ returns empty list initially."""
+        self.client.force_login(self.user)
+
+        response = self.client.get(f"/api/v1/scenario/{self.scenario.uuid}/information/")
+
+        self.assertEqual(response.status_code, 200)
+        data = response.json()
+        self.assertIsInstance(data, list)
+        self.assertEqual(len(data), 0)
+
+    def test_create_additional_information(self):
+        """Test POST creates additional information."""
+        self.client.force_login(self.user)
+
+        # Create temperature information (assuming temperature model exists)
+        payload = {"interval": {"start": 20, "end": 25}}
+        response = self.client.post(
+            f"/api/v1/scenario/{self.scenario.uuid}/information/temperature/",
+            data=json.dumps(payload),
+            content_type="application/json",
+        )
+
+        self.assertEqual(response.status_code, 200)
+        data = response.json()
+        self.assertEqual(data["status"], "created")
+        self.assertIn("uuid", data)
+        self.assertIsNotNone(data["uuid"])
+
+    def test_create_with_invalid_data_returns_400(self):
+        """Test POST with invalid data returns 400 with validation errors."""
+        self.client.force_login(self.user)
+
+        # Invalid data (missing required fields or wrong types)
+        payload = {"invalid_field": "value"}
+        response = self.client.post(
+            f"/api/v1/scenario/{self.scenario.uuid}/information/temperature/",
+            data=json.dumps(payload),
+            content_type="application/json",
+        )
+
+        self.assertEqual(response.status_code, 400)
+        data = response.json()
+        # Should have validation error details in 'detail' field
+        self.assertIn("detail", data)
+
+    def test_validation_errors_are_user_friendly(self):
+        """Test that validation errors are user-friendly and field-specific."""
+        self.client.force_login(self.user)
+
+        # Invalid data - wrong type (string instead of number in interval)
+        payload = {"interval": {"start": "not_a_number", "end": 25}}
+        response = self.client.post(
+            f"/api/v1/scenario/{self.scenario.uuid}/information/temperature/",
+            data=json.dumps(payload),
+            content_type="application/json",
+        )
+
+        self.assertEqual(response.status_code, 400)
+        data = response.json()
+
+        # Parse the error response - Django Ninja wraps errors in 'detail'
+        error_str = data.get("detail") or data.get("error")
+        self.assertIsNotNone(error_str, "Response should contain error details")
+
+        # Parse the JSON error string
+        error_data = json.loads(error_str)
+
+        # Check structure
+        self.assertEqual(error_data.get("type"), "validation_error")
+        self.assertIn("field_errors", error_data)
+        self.assertIn("message", error_data)
+
+        # Ensure error messages are user-friendly (no Pydantic URLs or technical jargon)
+        error_str = json.dumps(error_data)
+        self.assertNotIn("pydantic", error_str.lower())
+        self.assertNotIn("https://errors.pydantic.dev", error_str)
+        self.assertNotIn("loc", error_str)  # No technical field like 'loc'
+
+        # Check that error message is helpful
+        self.assertIn("Please", error_data["message"])  # User-friendly language
+
+    def test_patch_additional_information(self):
+        """Test PATCH updates existing additional information."""
+        self.client.force_login(self.user)
+
+        # First create an item
+        create_payload = {"interval": {"start": 20, "end": 25}}
+        create_response = self.client.post(
+            f"/api/v1/scenario/{self.scenario.uuid}/information/temperature/",
+            data=json.dumps(create_payload),
+            content_type="application/json",
+        )
+        item_uuid = create_response.json()["uuid"]
+
+        # Then update it with PATCH
+        update_payload = {"interval": {"start": 30, "end": 35}}
+        patch_response = self.client.patch(
+            f"/api/v1/scenario/{self.scenario.uuid}/information/item/{item_uuid}/",
+            data=json.dumps(update_payload),
+            content_type="application/json",
+        )
+
+        self.assertEqual(patch_response.status_code, 200)
+        data = patch_response.json()
+        self.assertEqual(data["status"], "updated")
+        self.assertEqual(data["uuid"], item_uuid)  # UUID preserved
+
+        # Verify the data was updated
+        list_response = self.client.get(f"/api/v1/scenario/{self.scenario.uuid}/information/")
+        items = list_response.json()
+        self.assertEqual(len(items), 1)
+        updated_item = items[0]
+        self.assertEqual(updated_item["uuid"], item_uuid)
+        self.assertEqual(updated_item["data"]["interval"]["start"], 30)
+        self.assertEqual(updated_item["data"]["interval"]["end"], 35)
+
+    def test_patch_nonexistent_item_returns_404(self):
+        """Test PATCH on non-existent item returns 404."""
+        self.client.force_login(self.user)
+
+        fake_uuid = str(uuid4())
+        payload = {"interval": {"start": 30, "end": 35}}
+        response = self.client.patch(
+            f"/api/v1/scenario/{self.scenario.uuid}/information/item/{fake_uuid}/",
+            data=json.dumps(payload),
+            content_type="application/json",
+        )
+
+        self.assertEqual(response.status_code, 404)
+
+    def test_patch_with_invalid_data_returns_400(self):
+        """Test PATCH with invalid data returns 400."""
+        self.client.force_login(self.user)
+
+        # First create an item
+        create_payload = {"interval": {"start": 20, "end": 25}}
+        create_response = self.client.post(
+            f"/api/v1/scenario/{self.scenario.uuid}/information/temperature/",
+            data=json.dumps(create_payload),
+            content_type="application/json",
+        )
+        item_uuid = create_response.json()["uuid"]
+
+        # Try to update with invalid data
+        invalid_payload = {"invalid_field": "value"}
+        patch_response = self.client.patch(
+            f"/api/v1/scenario/{self.scenario.uuid}/information/item/{item_uuid}/",
+            data=json.dumps(invalid_payload),
+            content_type="application/json",
+        )
+
+        self.assertEqual(patch_response.status_code, 400)
+
+    def test_delete_additional_information(self):
+        """Test DELETE removes additional information."""
+        self.client.force_login(self.user)
+
+        # Create an item
+        create_payload = {"interval": {"start": 20, "end": 25}}
+        create_response = self.client.post(
+            f"/api/v1/scenario/{self.scenario.uuid}/information/temperature/",
+            data=json.dumps(create_payload),
+            content_type="application/json",
+        )
+        item_uuid = create_response.json()["uuid"]
+
+        # Delete it
+        delete_response = self.client.delete(
+            f"/api/v1/scenario/{self.scenario.uuid}/information/item/{item_uuid}/"
+        )
+
+        self.assertEqual(delete_response.status_code, 200)
+        data = delete_response.json()
+        self.assertEqual(data["status"], "deleted")
+
+        # Verify deletion
+        list_response = self.client.get(f"/api/v1/scenario/{self.scenario.uuid}/information/")
+        items = list_response.json()
+        self.assertEqual(len(items), 0)
+
+    def test_delete_nonexistent_item_returns_404(self):
+        """Test DELETE on non-existent item returns 404."""
+        self.client.force_login(self.user)
+
+        fake_uuid = str(uuid4())
+        response = self.client.delete(
+            f"/api/v1/scenario/{self.scenario.uuid}/information/item/{fake_uuid}/"
+        )
+
+        self.assertEqual(response.status_code, 404)
+
+    def test_multiple_items_crud(self):
+        """Test creating, updating, and deleting multiple items."""
+        self.client.force_login(self.user)
+
+        # Create first item
+        item1_payload = {"interval": {"start": 20, "end": 25}}
+        response1 = self.client.post(
+            f"/api/v1/scenario/{self.scenario.uuid}/information/temperature/",
+            data=json.dumps(item1_payload),
+            content_type="application/json",
+        )
+        item1_uuid = response1.json()["uuid"]
+
+        # Create second item (different type if available, or same type)
+        item2_payload = {"interval": {"start": 30, "end": 35}}
+        response2 = self.client.post(
+            f"/api/v1/scenario/{self.scenario.uuid}/information/temperature/",
+            data=json.dumps(item2_payload),
+            content_type="application/json",
+        )
+        item2_uuid = response2.json()["uuid"]
+
+        # Verify both exist
+        list_response = self.client.get(f"/api/v1/scenario/{self.scenario.uuid}/information/")
+        items = list_response.json()
+        self.assertEqual(len(items), 2)
+
+        # Update first item
+        update_payload = {"interval": {"start": 15, "end": 20}}
+        self.client.patch(
+            f"/api/v1/scenario/{self.scenario.uuid}/information/item/{item1_uuid}/",
+            data=json.dumps(update_payload),
+            content_type="application/json",
+        )
+
+        # Delete second item
+        self.client.delete(f"/api/v1/scenario/{self.scenario.uuid}/information/item/{item2_uuid}/")
+
+        # Verify final state: one item with updated data
+        list_response = self.client.get(f"/api/v1/scenario/{self.scenario.uuid}/information/")
+        items = list_response.json()
+        self.assertEqual(len(items), 1)
+        self.assertEqual(items[0]["uuid"], item1_uuid)
+        self.assertEqual(items[0]["data"]["interval"]["start"], 15)
+
+    def test_unauthenticated_access_returns_401(self):
+        """Test that unauthenticated requests return 401."""
+        # Don't log in
+        response = self.client.get(f"/api/v1/scenario/{self.scenario.uuid}/information/")
+
+        self.assertEqual(response.status_code, 401)
+
+    def test_list_info_denied_without_permission(self):
+        """User cannot list info for scenario in package they don't have access to"""
+        self.client.force_login(self.user)
+        response = self.client.get(f"/api/v1/scenario/{self.other_scenario.uuid}/information/")
+        self.assertEqual(response.status_code, 403)
+
+    def test_add_info_denied_without_permission(self):
+        """User cannot add info to scenario in package they don't have access to"""
+        self.client.force_login(self.user)
+        payload = {"interval": {"start": 25, "end": 30}}
+        response = self.client.post(
+            f"/api/v1/scenario/{self.other_scenario.uuid}/information/temperature/",
+            json.dumps(payload),
+            content_type="application/json",
+        )
+        self.assertEqual(response.status_code, 403)
+
+    def test_update_info_denied_without_permission(self):
+        """User cannot update info in scenario they don't have access to"""
+        self.client.force_login(self.other_user)
+        # First create an item as other_user
+        create_payload = {"interval": {"start": 20, "end": 25}}
+        create_response = self.client.post(
+            f"/api/v1/scenario/{self.other_scenario.uuid}/information/temperature/",
+            data=json.dumps(create_payload),
+            content_type="application/json",
+        )
+        item_uuid = create_response.json()["uuid"]
+
+        # Try to update as user (who doesn't have access)
+        self.client.force_login(self.user)
+        update_payload = {"interval": {"start": 30, "end": 35}}
+        response = self.client.patch(
+            f"/api/v1/scenario/{self.other_scenario.uuid}/information/item/{item_uuid}/",
+            data=json.dumps(update_payload),
+            content_type="application/json",
+        )
+        self.assertEqual(response.status_code, 403)
+
+    def test_delete_info_denied_without_permission(self):
+        """User cannot delete info from scenario they don't have access to"""
+        self.client.force_login(self.other_user)
+        # First create an item as other_user
+        create_payload = {"interval": {"start": 20, "end": 25}}
+        create_response = self.client.post(
+            f"/api/v1/scenario/{self.other_scenario.uuid}/information/temperature/",
+            data=json.dumps(create_payload),
+            content_type="application/json",
+        )
+        item_uuid = create_response.json()["uuid"]
+
+        # Try to delete as user (who doesn't have access)
+        self.client.force_login(self.user)
+        response = self.client.delete(
+            f"/api/v1/scenario/{self.other_scenario.uuid}/information/item/{item_uuid}/"
+        )
+        self.assertEqual(response.status_code, 403)
+
+    def test_anonymous_user_denied(self):
+        """Anonymous users cannot access private scenarios"""
+        # Ensure scenario package is not reviewed (private)
+        self.scenario.package.reviewed = False
+        self.scenario.package.save()
+
+        # Unauthenticated users get 401 from the auth layer
+        response = self.client.get(f"/api/v1/scenario/{self.scenario.uuid}/information/")
+        self.assertEqual(response.status_code, 401)
+
+    def test_nonexistent_scenario_returns_404(self):
+        """Test operations on non-existent scenario return 404."""
+        self.client.force_login(self.user)
+
+        fake_uuid = uuid4()
+        response = self.client.get(f"/api/v1/scenario/{fake_uuid}/information/")
+
+        self.assertEqual(response.status_code, 404)
diff --git a/epapi/tests/v1/test_scenario_creation.py b/epapi/tests/v1/test_scenario_creation.py
new file mode 100644
index 00000000..3cd16579
--- /dev/null
+++ b/epapi/tests/v1/test_scenario_creation.py
@@ -0,0 +1,325 @@
+"""
+Tests for Scenario Creation Endpoint Error Handling.
+
+Tests comprehensive error handling for POST /api/v1/package/{uuid}/scenario/
+including package not found, permission denied, validation errors, and database errors.
+"""
+
+from django.test import TestCase, tag
+import json
+from uuid import uuid4
+
+from epdb.logic import PackageManager, UserManager
+from epdb.models import Scenario
+
+
+@tag("api", "scenario_creation")
+class ScenarioCreationAPITests(TestCase):
+    """Test scenario creation endpoint error handling."""
+
+    @classmethod
+    def setUpTestData(cls):
+        """Set up test data: users and packages."""
+        cls.user = UserManager.create_user(
+            "scenario-test-user",
+            "scenario-test@envipath.com",
+            "SuperSafe",
+            set_setting=False,
+            add_to_group=False,
+            is_active=True,
+        )
+        cls.other_user = UserManager.create_user(
+            "other-user",
+            "other@envipath.com",
+            "SuperSafe",
+            set_setting=False,
+            add_to_group=False,
+            is_active=True,
+        )
+        cls.package = PackageManager.create_package(
+            cls.user, "Test Package", "Test package for scenario creation"
+        )
+
+    def test_create_scenario_package_not_found(self):
+        """Test that non-existent package UUID returns 404."""
+        self.client.force_login(self.user)
+
+        fake_uuid = uuid4()
+        payload = {
+            "name": "Test Scenario",
+            "description": "Test description",
+            "scenario_date": "2024-01-01",
+            "scenario_type": "biodegradation",
+            "additional_information": [],
+        }
+
+        response = self.client.post(
+            f"/api/v1/package/{fake_uuid}/scenario/",
+            data=json.dumps(payload),
+            content_type="application/json",
+        )
+
+        self.assertEqual(response.status_code, 404)
+        self.assertIn("Package not found", response.json()["detail"])
+
+    def test_create_scenario_insufficient_permissions(self):
+        """Test that unauthorized access returns 403."""
+        self.client.force_login(self.other_user)
+
+        payload = {
+            "name": "Test Scenario",
+            "description": "Test description",
+            "scenario_date": "2024-01-01",
+            "scenario_type": "biodegradation",
+            "additional_information": [],
+        }
+
+        response = self.client.post(
+            f"/api/v1/package/{self.package.uuid}/scenario/",
+            data=json.dumps(payload),
+            content_type="application/json",
+        )
+
+        self.assertEqual(response.status_code, 403)
+        self.assertIn("permission", response.json()["detail"].lower())
+
+    def test_create_scenario_invalid_ai_type(self):
+        """Test that unknown additional information type returns 400."""
+        self.client.force_login(self.user)
+
+        payload = {
+            "name": "Test Scenario",
+            "description": "Test description",
+            "scenario_date": "2024-01-01",
+            "scenario_type": "biodegradation",
+            "additional_information": [
+                {"type": "invalid_type_that_does_not_exist", "data": {"some_field": "some_value"}}
+            ],
+        }
+
+        response = self.client.post(
+            f"/api/v1/package/{self.package.uuid}/scenario/",
+            data=json.dumps(payload),
+            content_type="application/json",
+        )
+
+        self.assertEqual(response.status_code, 400)
+        response_data = response.json()
+        self.assertIn("Validation errors", response_data["detail"])
+
+    def test_create_scenario_validation_error(self):
+        """Test that invalid additional information data returns 400."""
+        self.client.force_login(self.user)
+
+        # Use malformed data structure for an actual AI type
+        payload = {
+            "name": "Test Scenario",
+            "description": "Test description",
+            "scenario_date": "2024-01-01",
+            "scenario_type": "biodegradation",
+            "additional_information": [
+                {
+                    "type": "SomeValidType",
+                    "data": None,  # This should cause a validation error
+                }
+            ],
+        }
+
+        response = self.client.post(
+            f"/api/v1/package/{self.package.uuid}/scenario/",
+            data=json.dumps(payload),
+            content_type="application/json",
+        )
+
+        # Should return 400 for validation errors
+        self.assertIn(response.status_code, [400, 422])
+
+    def test_create_scenario_success(self):
+        """Test that valid scenario creation returns 200."""
+        self.client.force_login(self.user)
+
+        payload = {
+            "name": "Test Scenario",
+            "description": "Test description",
+            "scenario_date": "2024-01-01",
+            "scenario_type": "biodegradation",
+            "additional_information": [],
+        }
+
+        response = self.client.post(
+            f"/api/v1/package/{self.package.uuid}/scenario/",
+            data=json.dumps(payload),
+            content_type="application/json",
+        )
+
+        self.assertEqual(response.status_code, 200)
+        data = response.json()
+        self.assertEqual(data["name"], "Test Scenario")
+        self.assertEqual(data["description"], "Test description")
+
+        # Verify scenario was actually created
+        scenario = Scenario.objects.get(name="Test Scenario")
+        self.assertEqual(scenario.package, self.package)
+        self.assertEqual(scenario.scenario_type, "biodegradation")
+
+    def test_create_scenario_with_additional_information(self):
+        """Test creating scenario with valid additional information models."""
+        self.client.force_login(self.user)
+
+        # This test will succeed if the registry has valid models
+        # For now, test with empty additional_information
+        payload = {
+            "name": "Scenario with AI",
+            "description": "Test with additional information",
+            "scenario_date": "2024-01-01",
+            "scenario_type": "biodegradation",
+            "additional_information": [],
+        }
+
+        response = self.client.post(
+            f"/api/v1/package/{self.package.uuid}/scenario/",
+            data=json.dumps(payload),
+            content_type="application/json",
+        )
+
+        self.assertEqual(response.status_code, 200)
+        data = response.json()
+        self.assertEqual(data["name"], "Scenario with AI")
+
+    def test_create_scenario_auto_name(self):
+        """Test that empty name triggers auto-generation."""
+        self.client.force_login(self.user)
+
+        payload = {
+            "name": "",  # Empty name should be auto-generated
+            "description": "Test description",
+            "scenario_date": "2024-01-01",
+            "scenario_type": "biodegradation",
+            "additional_information": [],
+        }
+
+        response = self.client.post(
+            f"/api/v1/package/{self.package.uuid}/scenario/",
+            data=json.dumps(payload),
+            content_type="application/json",
+        )
+
+        self.assertEqual(response.status_code, 200)
+        data = response.json()
+        # Auto-generated name should follow pattern "Scenario N"
+        self.assertTrue(data["name"].startswith("Scenario "))
+
+    def test_create_scenario_xss_protection(self):
+        """Test that XSS attempts are sanitized."""
+        self.client.force_login(self.user)
+
+        payload = {
+            "name": "<script>alert('xss')</script>Clean Name",
+            "description": "<img src=x onerror=alert('xss')>Description",
+            "scenario_date": "2024-01-01",
+            "scenario_type": "biodegradation",
+            "additional_information": [],
+        }
+
+        response = self.client.post(
+            f"/api/v1/package/{self.package.uuid}/scenario/",
+            data=json.dumps(payload),
+            content_type="application/json",
+        )
+
+        self.assertEqual(response.status_code, 200)
+        data = response.json()
+        # XSS should be cleaned out
+        self.assertNotIn("<script>", data["name"])
+        self.assertNotIn("onerror", data["description"])
+
+    def test_create_scenario_missing_required_field(self):
+        """Test that missing required fields returns validation error."""
+        self.client.force_login(self.user)
+
+        # Missing 'name' field entirely
+        payload = {
+            "description": "Test description",
+            "scenario_date": "2024-01-01",
+            "scenario_type": "biodegradation",
+            "additional_information": [],
+        }
+
+        response = self.client.post(
+            f"/api/v1/package/{self.package.uuid}/scenario/",
+            data=json.dumps(payload),
+            content_type="application/json",
+        )
+
+        # Should return 422 for schema validation errors
+        self.assertEqual(response.status_code, 422)
+
+    def test_create_scenario_type_error_in_ai(self):
+        """Test that TypeError in AI instantiation returns 400."""
+        self.client.force_login(self.user)
+
+        payload = {
+            "name": "Test Scenario",
+            "description": "Test description",
+            "scenario_date": "2024-01-01",
+            "scenario_type": "biodegradation",
+            "additional_information": [
+                {
+                    "type": "SomeType",
+                    "data": "string instead of dict",  # Wrong type
+                }
+            ],
+        }
+
+        response = self.client.post(
+            f"/api/v1/package/{self.package.uuid}/scenario/",
+            data=json.dumps(payload),
+            content_type="application/json",
+        )
+
+        # Should return 400 for validation errors
+        self.assertIn(response.status_code, [400, 422])
+
+    def test_create_scenario_default_values(self):
+        """Test that default values are applied correctly."""
+        self.client.force_login(self.user)
+
+        # Minimal payload with only name
+        payload = {"name": "Minimal Scenario"}
+
+        response = self.client.post(
+            f"/api/v1/package/{self.package.uuid}/scenario/",
+            data=json.dumps(payload),
+            content_type="application/json",
+        )
+
+        self.assertEqual(response.status_code, 200)
+        data = response.json()
+        self.assertEqual(data["name"], "Minimal Scenario")
+        # Check defaults are applied
+        scenario = Scenario.objects.get(name="Minimal Scenario")
+        # Default description from model is "no description"
+        self.assertIn(scenario.description.lower(), ["", "no description"])
+
+    def test_create_scenario_unicode_characters(self):
+        """Test that unicode characters are handled properly."""
+        self.client.force_login(self.user)
+
+        payload = {
+            "name": "Test Scenario 测试 🧪",
+            "description": "Description with émojis and spëcial çhars",
+            "scenario_date": "2024-01-01",
+            "scenario_type": "biodegradation",
+            "additional_information": [],
+        }
+
+        response = self.client.post(
+            f"/api/v1/package/{self.package.uuid}/scenario/",
+            data=json.dumps(payload),
+            content_type="application/json",
+        )
+
+        self.assertEqual(response.status_code, 200)
+        data = response.json()
+        self.assertIn("测试", data["name"])
+        self.assertIn("émojis", data["description"])
diff --git a/epapi/tests/v1/test_schema_generation.py b/epapi/tests/v1/test_schema_generation.py
new file mode 100644
index 00000000..4350ff7b
--- /dev/null
+++ b/epapi/tests/v1/test_schema_generation.py
@@ -0,0 +1,114 @@
+"""
+Property-based tests for schema generation.
+
+Tests that verify schema generation works correctly for all models,
+regardless of their structure.
+"""
+
+import pytest
+from typing import Type
+from pydantic import BaseModel
+
+from envipy_additional_information import registry, EnviPyModel
+from epapi.utils.schema_transformers import build_rjsf_output
+
+
+class TestSchemaGeneration:
+    """Test that all models can generate valid RJSF schemas."""
+
+    @pytest.mark.parametrize("model_name,model_cls", list(registry.list_models().items()))
+    def test_all_models_generate_rjsf(self, model_name: str, model_cls: Type[BaseModel]):
+        """Every model in the registry should generate valid RJSF format."""
+        # Skip non-EnviPyModel classes (parsers, etc.)
+        if not issubclass(model_cls, EnviPyModel):
+            pytest.skip(f"{model_name} is not an EnviPyModel")
+
+        # Should not raise exception
+        result = build_rjsf_output(model_cls)
+
+        # Verify structure
+        assert isinstance(result, dict), f"{model_name}: Result should be a dict"
+        assert "schema" in result, f"{model_name}: Missing 'schema' key"
+        assert "uiSchema" in result, f"{model_name}: Missing 'uiSchema' key"
+        assert "formData" in result, f"{model_name}: Missing 'formData' key"
+        assert "groups" in result, f"{model_name}: Missing 'groups' key"
+
+        # Verify types
+        assert isinstance(result["schema"], dict), f"{model_name}: schema should be dict"
+        assert isinstance(result["uiSchema"], dict), f"{model_name}: uiSchema should be dict"
+        assert isinstance(result["formData"], dict), f"{model_name}: formData should be dict"
+        assert isinstance(result["groups"], list), f"{model_name}: groups should be list"
+
+        # Verify schema has properties
+        assert "properties" in result["schema"], f"{model_name}: schema should have 'properties'"
+        assert isinstance(result["schema"]["properties"], dict), (
+            f"{model_name}: properties should be dict"
+        )
+
+    @pytest.mark.parametrize("model_name,model_cls", list(registry.list_models().items()))
+    def test_ui_schema_matches_schema_fields(self, model_name: str, model_cls: Type[BaseModel]):
+        """uiSchema keys should match schema properties (or be nested for intervals)."""
+        if not issubclass(model_cls, EnviPyModel):
+            pytest.skip(f"{model_name} is not an EnviPyModel")
+
+        result = build_rjsf_output(model_cls)
+        schema_props = set(result["schema"]["properties"].keys())
+        ui_schema_keys = set(result["uiSchema"].keys())
+
+        # uiSchema should have entries for all top-level properties
+        # (intervals may have nested start/end, but the main field should be present)
+        assert ui_schema_keys.issubset(schema_props), (
+            f"{model_name}: uiSchema has keys not in schema: {ui_schema_keys - schema_props}"
+        )
+
+    @pytest.mark.parametrize("model_name,model_cls", list(registry.list_models().items()))
+    def test_groups_is_list_of_strings(self, model_name: str, model_cls: Type[BaseModel]):
+        """Groups should be a list of strings."""
+        if not issubclass(model_cls, EnviPyModel):
+            pytest.skip(f"{model_name} is not an EnviPyModel")
+
+        result = build_rjsf_output(model_cls)
+        groups = result["groups"]
+
+        assert isinstance(groups, list), f"{model_name}: groups should be list"
+        assert all(isinstance(g, str) for g in groups), (
+            f"{model_name}: all groups should be strings, got {groups}"
+        )
+        assert len(groups) > 0, f"{model_name}: should have at least one group"
+
+    @pytest.mark.parametrize("model_name,model_cls", list(registry.list_models().items()))
+    def test_form_data_matches_schema(self, model_name: str, model_cls: Type[BaseModel]):
+        """formData keys should match schema properties."""
+        if not issubclass(model_cls, EnviPyModel):
+            pytest.skip(f"{model_name} is not an EnviPyModel")
+
+        result = build_rjsf_output(model_cls)
+        schema_props = set(result["schema"]["properties"].keys())
+        form_data_keys = set(result["formData"].keys())
+
+        # formData should only contain keys that are in schema
+        assert form_data_keys.issubset(schema_props), (
+            f"{model_name}: formData has keys not in schema: {form_data_keys - schema_props}"
+        )
+
+
+class TestWidgetTypes:
+    """Test that widget types are valid."""
+
+    @pytest.mark.parametrize("model_name,model_cls", list(registry.list_models().items()))
+    def test_widget_types_are_valid(self, model_name: str, model_cls: Type[BaseModel]):
+        """All widget types in uiSchema should be valid WidgetType values."""
+        from envipy_additional_information.ui_config import WidgetType
+
+        if not issubclass(model_cls, EnviPyModel):
+            pytest.skip(f"{model_name} is not an EnviPyModel")
+
+        result = build_rjsf_output(model_cls)
+        valid_widgets = {wt.value for wt in WidgetType}
+
+        for field_name, ui_config in result["uiSchema"].items():
+            widget = ui_config.get("ui:widget")
+            if widget:
+                assert widget in valid_widgets, (
+                    f"{model_name}.{field_name}: Invalid widget '{widget}'. Valid: {valid_widgets}"
+                )
diff --git a/epapi/utils/__init__.py b/epapi/utils/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/epapi/utils/schema_transformers.py b/epapi/utils/schema_transformers.py
new file mode 100644
index 00000000..6ff18bdf
--- /dev/null
+++ b/epapi/utils/schema_transformers.py
@@ -0,0 +1,175 @@
+"""
+Schema transformation utilities for converting Pydantic models to RJSF format.
+
+This module provides functions to extract UI configuration from Pydantic models
+and transform them into React JSON Schema Form (RJSF) compatible format.
+"""
+
+from typing import Type, Optional, Any
+
+import jsonref
+from pydantic import BaseModel
+
+from envipy_additional_information.ui_config import UIConfig
+from envipy_additional_information import registry
+
+
+def extract_groups(model_cls: Type[BaseModel]) -> list[str]:
+    """
+    Extract groups from registry-stored group information.
+
+    Args:
+        model_cls: The model class
+
+    Returns:
+        List of group names the model belongs to
+    """
+    return registry.get_groups(model_cls)
+
+
+def extract_ui_metadata(model_cls: Type[BaseModel]) -> dict[str, Any]:
+    """
+    Extract model-level UI metadata from UI class.
+
+    Returns metadata attributes that are NOT UIConfig instances.
+    Common metadata includes: unit, description, title.
+    """
+    metadata: dict[str, Any] = {}
+
+    if not hasattr(model_cls, "UI"):
+        return metadata
+
+    ui_class = getattr(model_cls, "UI")
+
+    # Iterate over all attributes in the UI class
+    for attr_name in dir(ui_class):
+        # Skip private attributes
+        if attr_name.startswith("_"):
+            continue
+
+        # Get the attribute value
+        try:
+            attr_value = getattr(ui_class, attr_name)
+        except AttributeError:
+            continue
+
+        # Skip callables but keep types/classes
+        if callable(attr_value) and not isinstance(attr_value, type):
+            continue
+
+        # Skip UIConfig instances (these are field-level configs, not metadata)
+        # This includes both UIConfig and IntervalConfig
+        if isinstance(attr_value, UIConfig):
+            continue
+
+        metadata[attr_name] = attr_value
+
+    return metadata
+
+
+def extract_ui_config_from_model(model_cls: Type[BaseModel]) -> dict[str, Any]:
+    """
+    Extract UI configuration from model's UI class.
+
+    Returns a dictionary mapping field names to their UI schema configurations.
+    Trusts the config classes to handle their own transformation logic.
+    """
+    ui_configs: dict[str, Any] = {}
+
+    if not hasattr(model_cls, "UI"):
+        return ui_configs
+
+    ui_class = getattr(model_cls, "UI")
+    schema = model_cls.model_json_schema()
+    field_names = schema.get("properties", {}).keys()
+
+    # Extract config for each field
+    for field_name in field_names:
+        ui_config = getattr(ui_class, field_name)
+
+        if isinstance(ui_config, UIConfig):
+            ui_configs[field_name] = ui_config.to_ui_schema_field()
+
+    return ui_configs
+
+
+def build_ui_schema(model_cls: Type[BaseModel]) -> dict:
+    """Generate RJSF uiSchema from model's UI class."""
+    ui_schema = {}
+
+    # Extract field-level UI configs
+    field_configs = extract_ui_config_from_model(model_cls)
+
+    for field_name, config in field_configs.items():
+        ui_schema[field_name] = config
+
+    return ui_schema
+
+
+def build_schema(model_cls: Type[BaseModel]) -> dict[str, Any]:
+    """
+    Build JSON schema from Pydantic model, applying UI metadata.
+
+    Dereferences all $ref pointers to produce fully inlined schema.
+    This ensures the frontend receives schemas with enum values and nested
+    properties fully resolved, without needing client-side ref resolution.
+
+    Extracts model-level metadata from UI class (title, unit, etc.) and applies
+    it to the generated schema. This ensures UI metadata is the single source of truth.
+    """
+    schema = model_cls.model_json_schema()
+
+    # Dereference $ref pointers (inlines $defs) using jsonref
+    # This ensures the frontend receives schemas with enum values and nested
+    # properties fully resolved, currently necessary for client-side rendering.
+    # FIXME: This is a hack to get the schema to work with alpine schema-form.js replace once we migrate to client-side framework.
+    schema = jsonref.replace_refs(schema, proxies=False)
+
+    # Remove $defs section as all refs are now inlined
+    if "$defs" in schema:
+        del schema["$defs"]
+
+    # Extract and apply UI metadata (title, unit, description, etc.)
+    ui_metadata = extract_ui_metadata(model_cls)
+
+    # Apply all metadata consistently as custom properties with x- prefix
+    # This ensures consistency and avoids conflicts with standard JSON Schema properties
+    for key, value in ui_metadata.items():
+        if value is not None:
+            schema[f"x-{key}"] = value
+
+    # Set standard title property from UI metadata for JSON Schema compliance
+    if "label" in ui_metadata:
+        schema["title"] = ui_metadata["label"]
+
+    return schema
+
+
+def build_rjsf_output(model_cls: Type[BaseModel], initial_data: Optional[dict] = None) -> dict:
+    """
+    Main function that returns complete RJSF format.
+
+    Trusts the config classes to handle their own transformation logic.
+    No special-case handling - if a config knows how to transform itself, it will.
+
+    Returns:
+        dict with keys: schema, uiSchema, formData, groups
+    """
+    # Build schema with UI metadata applied
+    schema = build_schema(model_cls)
+
+    # Build UI schema - config classes handle their own transformation
+    ui_schema = build_ui_schema(model_cls)
+
+    # Extract groups from marker interfaces
+    groups = extract_groups(model_cls)
+
+    # Use provided initial_data or empty dict
+    form_data = initial_data if initial_data is not None else {}
+
+    return {
+        "schema": schema,
+        "uiSchema": ui_schema,
+        "formData": form_data,
+        "groups": groups,
+    }
diff --git a/epapi/v1/dal.py b/epapi/v1/dal.py
index 94a23345..ec537c86 100644
--- a/epapi/v1/dal.py
+++ b/epapi/v1/dal.py
@@ -1,12 +1,12 @@
 from django.db.models import Model
 from epdb.logic import PackageManager
-from epdb.models import CompoundStructure, User, Package, Compound
+from epdb.models import CompoundStructure, User, Package, Compound, Scenario
 from uuid import UUID
 
 from .errors import EPAPINotFoundError, EPAPIPermissionDeniedError
 
 
-def get_compound_or_error(user, compound_uuid: UUID):
+def get_compound_for_read(user, compound_uuid: UUID):
     """
     Get compound by UUID with permission check.
     """
@@ -23,7 +23,7 @@ def get_compound_or_error(user, compound_uuid: UUID):
     return compound
 
 
-def get_package_or_error(user, package_uuid: UUID):
+def get_package_for_read(user, package_uuid: UUID):
     """
     Get package by UUID with permission check.
     """
@@ -41,14 +41,40 @@ def get_package_or_error(user, package_uuid: UUID):
     return package
 
 
-def get_user_packages_qs(user: User | None):
+def get_scenario_for_read(user, scenario_uuid: UUID):
+    """Get scenario by UUID with read permission check."""
+    try:
+        scenario = Scenario.objects.select_related("package").get(uuid=scenario_uuid)
+    except Scenario.DoesNotExist:
+        raise EPAPINotFoundError(f"Scenario with UUID {scenario_uuid} not found")
+
+    if not user or user.is_anonymous or not PackageManager.readable(user, scenario.package):
+        raise EPAPIPermissionDeniedError("Insufficient permissions to access this scenario.")
+
+    return scenario
+
+
+def get_scenario_for_write(user, scenario_uuid: UUID):
+    """Get scenario by UUID with write permission check."""
+    try:
+        scenario = Scenario.objects.select_related("package").get(uuid=scenario_uuid)
+    except Scenario.DoesNotExist:
+        raise EPAPINotFoundError(f"Scenario with UUID {scenario_uuid} not found")
+
+    if not user or user.is_anonymous or not PackageManager.writable(user, scenario.package):
+        raise EPAPIPermissionDeniedError("Insufficient permissions to modify this scenario.")
+
+    return scenario
+
+
+def get_user_packages_for_read(user: User | None):
     """Get all packages readable by the user."""
     if not user or user.is_anonymous:
         return PackageManager.get_reviewed_packages()
     return PackageManager.get_all_readable_packages(user, include_reviewed=True)
 
 
-def get_user_entities_qs(model_class: Model, user: User | None):
+def get_user_entities_for_read(model_class: Model, user: User | None):
     """Build queryset for reviewed package entities."""
 
     if not user or user.is_anonymous:
@@ -60,16 +86,14 @@ def get_user_entities_qs(model_class: Model, user: User | None):
     return qs
 
 
-def get_package_scoped_entities_qs(
-    model_class: Model, package_uuid: UUID, user: User | None = None
-):
+def get_package_entities_for_read(model_class: Model, package_uuid: UUID, user: User | None = None):
     """Build queryset for specific package entities."""
-    package = get_package_or_error(user, package_uuid)
+    package = get_package_for_read(user, package_uuid)
     qs = model_class.objects.filter(package=package).select_related("package")
     return qs
 
 
-def get_user_structures_qs(user: User | None):
+def get_user_structure_for_read(user: User | None):
     """Build queryset for structures accessible to the user (via compound->package)."""
 
     if not user or user.is_anonymous:
@@ -83,13 +107,13 @@ def get_user_structures_qs(user: User | None):
     return qs
 
 
-def get_package_compound_scoped_structure_qs(
+def get_package_compound_structure_for_read(
     package_uuid: UUID, compound_uuid: UUID, user: User | None = None
 ):
     """Build queryset for specific package compound structures."""
 
-    get_package_or_error(user, package_uuid)
-    compound = get_compound_or_error(user, compound_uuid)
+    get_package_for_read(user, package_uuid)
+    compound = get_compound_for_read(user, compound_uuid)
 
     qs = CompoundStructure.objects.filter(compound=compound).select_related("compound__package")
     return qs
diff --git a/epapi/v1/endpoints/additional_information.py b/epapi/v1/endpoints/additional_information.py
new file mode 100644
index 00000000..5fbaf190
--- /dev/null
+++ b/epapi/v1/endpoints/additional_information.py
@@ -0,0 +1,237 @@
+from ninja import Router, Body
+from ninja.errors import HttpError
+from uuid import UUID
+from pydantic import ValidationError
+from pydantic_core import ErrorDetails
+from typing import Dict, Any
+import logging
+import json
+
+from envipy_additional_information import registry
+from envipy_additional_information.groups import GroupEnum
+from epapi.utils.schema_transformers import build_rjsf_output
+from ..dal import get_scenario_for_read, get_scenario_for_write
+
+logger = logging.getLogger(__name__)
+
+router = Router(tags=["Additional Information"])
+
+
+@router.get("/information/schema/")
+def list_all_schemas(request):
+    """Return all schemas in RJSF format with lowercase class names as keys."""
+    result = {}
+    for name, cls in registry.list_models().items():
+        try:
+            result[name] = build_rjsf_output(cls)
+        except Exception as e:
+            logger.warning(f"Failed to generate schema for {name}: {e}")
+            continue
+    return result
+
+
+@router.get("/information/schema/{model_name}/")
+def get_model_schema(request, model_name: str):
+    """Return RJSF schema for specific model."""
+    cls = registry.get_model(model_name.lower())
+    if not cls:
+        raise HttpError(404, f"Unknown model: {model_name}")
+    return build_rjsf_output(cls)
+
+
+@router.get("/scenario/{uuid:scenario_uuid}/information/")
+def list_scenario_info(request, scenario_uuid: UUID):
+    """List all additional information for a scenario"""
+    scenario = get_scenario_for_read(request.user, scenario_uuid)
+
+    result = []
+    for ai in scenario.get_additional_information():
+        result.append(
+            {
+                "type": ai.__class__.__name__,
+                "uuid": getattr(ai, "uuid", None),
+                "data": ai.model_dump(mode="json"),
+            }
+        )
+    return result
+
+
+def _format_validation_error(error: ErrorDetails) -> str:
+    """Format a Pydantic validation error into a user-friendly message."""
+    msg = error["msg"] or "Invalid value"
+    error_type = error["type"] or ""
+
+    # Handle common validation types with friendly messages
+    if error_type == "enum":
+        expected = error["ctx"]["expected"] if error["ctx"] else ""
+        return f"Please select a valid option{': ' + expected if expected else ''}"
+    elif error_type == "missing":
+        return "This field is required"
+    elif error_type in ("string_type", "int_type", "float_type"):
+        type_name = error_type.replace("_type", "")
+        return f"Please enter a valid {type_name}"
+    elif error_type == "value_error":
+        # Use the message as-is for value errors
+        return msg
+    else:
+        # Default: use the message from Pydantic but clean it up
+        return msg.replace("Input should be ", "Please enter ").replace("Value error, ", "")
+
+
+@router.post("/scenario/{uuid:scenario_uuid}/information/{model_name}/")
+def add_scenario_info(
+    request, scenario_uuid: UUID, model_name: str, payload: Dict[str, Any] = Body(...)
+):
+    """Add new additional information to scenario"""
+    cls = registry.get_model(model_name.lower())
+    if not cls:
+        raise HttpError(404, f"Unknown model: {model_name}")
+
+    try:
+        instance = cls(**payload)  # Pydantic validates
+    except ValidationError as e:
+        # Transform Pydantic validation errors into user-friendly format
+        field_errors: dict[str, list[str]] = {}
+        for error in e.errors():
+            # Get the field name from location tuple
+            loc = error.get("loc", ())
+            field = str(loc[-1]) if loc else "root"
+
+            # Format the error message
+            friendly_msg = _format_validation_error(error)
+
+            if field not in field_errors:
+                field_errors[field] = []
+            field_errors[field].append(friendly_msg)
+
+        # Return structured error for frontend parsing
+        error_response = {
+            "type": "validation_error",
+            "field_errors": field_errors,
+            "message": "Please correct the errors below",
+        }
+        raise HttpError(400, json.dumps(error_response))
+
+    scenario = get_scenario_for_write(request.user, scenario_uuid)
+
+    # Model method now returns the UUID
+    created_uuid = scenario.add_additional_information(instance)
+
+    return {"status": "created", "uuid": created_uuid}
+
+
+@router.patch("/scenario/{uuid:scenario_uuid}/information/item/{uuid:ai_uuid}/")
+def update_scenario_info(
+    request, scenario_uuid: UUID, ai_uuid: UUID, payload: Dict[str, Any] = Body(...)
+):
+    """Update existing additional information for a scenario"""
+    scenario = get_scenario_for_write(request.user, scenario_uuid)
+    ai_uuid_str = str(ai_uuid)
+
+    # Find item to determine type for validation
+    found_type = None
+    for type_name, items in scenario.additional_information.items():
+        if any(item.get("uuid") == ai_uuid_str for item in items):
+            found_type = type_name
+            break
+
+    if found_type is None:
+        raise HttpError(404, f"Additional information not found: {ai_uuid}")
+
+    # Get the model class for validation
+    cls = registry.get_model(found_type.lower())
+    if not cls:
+        raise HttpError(500, f"Unknown model type in data: {found_type}")
+
+    # Validate the payload against the model
+    try:
+        instance = cls(**payload)
+    except ValidationError as e:
+        # Transform Pydantic validation errors into user-friendly format
+        field_errors: dict[str, list[str]] = {}
+        for error in e.errors():
+            # Get the field name from location tuple
+            loc = error.get("loc", ())
+            field = str(loc[-1]) if loc else "root"
+
+            # Format the error message
+            friendly_msg = _format_validation_error(error)
+
+            if field not in field_errors:
+                field_errors[field] = []
+            field_errors[field].append(friendly_msg)
+
+        # Return structured error for frontend parsing
+        error_response = {
+            "type": "validation_error",
+            "field_errors": field_errors,
+            "message": "Please correct the errors below",
+        }
+        raise HttpError(400, json.dumps(error_response))
+
+    # Use model method for update
+    try:
+        scenario.update_additional_information(ai_uuid_str, instance)
+    except ValueError as e:
+        raise HttpError(404, str(e))
+
+    return {"status": "updated", "uuid": ai_uuid_str}
+
+
+@router.delete("/scenario/{uuid:scenario_uuid}/information/item/{uuid:ai_uuid}/")
+def delete_scenario_info(request, scenario_uuid: UUID, ai_uuid: UUID):
+    """Delete additional information from scenario"""
+    scenario = get_scenario_for_write(request.user, scenario_uuid)
+
+    try:
+        scenario.remove_additional_information(str(ai_uuid))
+    except ValueError as e:
+        raise HttpError(404, str(e))
+
+    return {"status": "deleted"}
+
+
+@router.get("/information/groups/")
+def list_groups(request):
+    """Return list of available group names."""
+    return {"groups": GroupEnum.values()}
+
+
+@router.get("/information/groups/{group_name}/")
+def get_group_models(request, group_name: str):
+    """
+    Return models for a specific group organized by subcategory.
+
+    Args:
+        group_name: One of "sludge", "soil", or "sediment" (string)
+
+    Returns:
+        Dictionary with subcategories (exp, spike, comp, misc, or group name)
+        as keys and lists of model info as values
+    """
+    # Convert string to enum (raises ValueError if invalid)
+    try:
+        group_enum = GroupEnum(group_name)
+    except ValueError:
+        valid = ", ".join(GroupEnum.values())
+        raise HttpError(400, f"Invalid group '{group_name}'. Valid: {valid}")
+
+    try:
+        group_data = registry.collect_group(group_enum)
+    except (ValueError, TypeError) as e:
+        raise HttpError(400, str(e))
+
+    result = {}
+    for subcategory, models in group_data.items():
+        result[subcategory] = [
+            {
+                "name": cls.__name__.lower(),
+                "class": cls.__name__,
+                "title": getattr(cls.UI, "title", cls.__name__)
+                if hasattr(cls, "UI")
+                else cls.__name__,
+            }
+            for cls in models
+        ]
+
+    return result
diff --git a/epapi/v1/endpoints/compounds.py b/epapi/v1/endpoints/compounds.py
index dd7e153f..4270bd07 100644
--- a/epapi/v1/endpoints/compounds.py
+++ b/epapi/v1/endpoints/compounds.py
@@ -6,7 +6,7 @@ from uuid import UUID
 from epdb.models import Compound
 from ..pagination import EnhancedPageNumberPagination
 from ..schemas import CompoundOutSchema, ReviewStatusFilter
-from ..dal import get_user_entities_qs, get_package_scoped_entities_qs
+from ..dal import get_user_entities_for_read, get_package_entities_for_read
 
 router = Router()
 
@@ -21,7 +21,7 @@ def list_all_compounds(request):
     """
     List all compounds from reviewed packages.
     """
-    return get_user_entities_qs(Compound, request.user).order_by("name").all()
+    return get_user_entities_for_read(Compound, request.user).order_by("name").all()
 
 
 @router.get(
@@ -38,4 +38,4 @@ def list_package_compounds(request, package_uuid: UUID):
     List all compounds for a specific package.
     """
     user = request.user
-    return get_package_scoped_entities_qs(Compound, package_uuid, user).order_by("name").all()
+    return get_package_entities_for_read(Compound, package_uuid, user).order_by("name").all()
diff --git a/epapi/v1/endpoints/models.py b/epapi/v1/endpoints/models.py
index 1ca6cc1e..666d7c29 100644
--- a/epapi/v1/endpoints/models.py
+++ b/epapi/v1/endpoints/models.py
@@ -6,7 +6,7 @@ from uuid import UUID
 from epdb.models import EPModel
 from ..pagination import EnhancedPageNumberPagination
 from ..schemas import ModelOutSchema, ReviewStatusFilter
-from ..dal import get_user_entities_qs, get_package_scoped_entities_qs
+from ..dal import get_user_entities_for_read, get_package_entities_for_read
 
 router = Router()
 
@@ -21,7 +21,7 @@ def list_all_models(request):
     """
     List all models from reviewed packages.
     """
-    return get_user_entities_qs(EPModel, request.user).order_by("name").all()
+    return get_user_entities_for_read(EPModel, request.user).order_by("name").all()
 
 
 @router.get(
@@ -38,4 +38,4 @@ def list_package_models(request, package_uuid: UUID):
     List all models for a specific package.
     """
     user = request.user
-    return get_package_scoped_entities_qs(EPModel, package_uuid, user).order_by("name").all()
+    return get_package_entities_for_read(EPModel, package_uuid, user).order_by("name").all()
diff --git a/epapi/v1/endpoints/packages.py b/epapi/v1/endpoints/packages.py
index 7f4265ee..ea08569c 100644
--- a/epapi/v1/endpoints/packages.py
+++ b/epapi/v1/endpoints/packages.py
@@ -3,7 +3,7 @@ from ninja import Router
 from ninja_extra.pagination import paginate
 import logging
 
-from ..dal import get_user_packages_qs
+from ..dal import get_user_packages_for_read
 from ..pagination import EnhancedPageNumberPagination
 from ..schemas import PackageOutSchema, SelfReviewStatusFilter
 
@@ -23,5 +23,5 @@ def list_all_packages(request):
 
     """
     user = request.user
-    qs = get_user_packages_qs(user)
+    qs = get_user_packages_for_read(user)
     return qs.order_by("name").all()
diff --git a/epapi/v1/endpoints/pathways.py b/epapi/v1/endpoints/pathways.py
index 5f704ae0..383332c8 100644
--- a/epapi/v1/endpoints/pathways.py
+++ b/epapi/v1/endpoints/pathways.py
@@ -6,7 +6,7 @@ from uuid import UUID
 from epdb.models import Pathway
 from ..pagination import EnhancedPageNumberPagination
 from ..schemas import PathwayOutSchema, ReviewStatusFilter
-from ..dal import get_user_entities_qs, get_package_scoped_entities_qs
+from ..dal import get_user_entities_for_read, get_package_entities_for_read
 
 router = Router()
 
@@ -22,7 +22,7 @@ def list_all_pathways(request):
     List all pathways from reviewed packages.
     """
     user = request.user
-    return get_user_entities_qs(Pathway, user).order_by("name").all()
+    return get_user_entities_for_read(Pathway, user).order_by("name").all()
 
 
 @router.get(
@@ -39,4 +39,4 @@ def list_package_pathways(request, package_uuid: UUID):
     List all pathways for a specific package.
     """
     user = request.user
-    return get_package_scoped_entities_qs(Pathway, package_uuid, user).order_by("name").all()
+    return get_package_entities_for_read(Pathway, package_uuid, user).order_by("name").all()
diff --git a/epapi/v1/endpoints/reactions.py b/epapi/v1/endpoints/reactions.py
index d43623c9..06fc8cbf 100644
--- a/epapi/v1/endpoints/reactions.py
+++ b/epapi/v1/endpoints/reactions.py
@@ -6,7 +6,7 @@ from uuid import UUID
 from epdb.models import Reaction
 from ..pagination import EnhancedPageNumberPagination
 from ..schemas import ReactionOutSchema, ReviewStatusFilter
-from ..dal import get_user_entities_qs, get_package_scoped_entities_qs
+from ..dal import get_user_entities_for_read, get_package_entities_for_read
 
 router = Router()
 
@@ -22,7 +22,7 @@ def list_all_reactions(request):
     List all reactions from reviewed packages.
     """
     user = request.user
-    return get_user_entities_qs(Reaction, user).order_by("name").all()
+    return get_user_entities_for_read(Reaction, user).order_by("name").all()
 
 
 @router.get(
@@ -39,4 +39,4 @@ def list_package_reactions(request, package_uuid: UUID):
     List all reactions for a specific package.
     """
     user = request.user
-    return get_package_scoped_entities_qs(Reaction, package_uuid, user).order_by("name").all()
+    return get_package_entities_for_read(Reaction, package_uuid, user).order_by("name").all()
diff --git a/epapi/v1/endpoints/rules.py b/epapi/v1/endpoints/rules.py
index 31808b74..ed33ca8f 100644
--- a/epapi/v1/endpoints/rules.py
+++ b/epapi/v1/endpoints/rules.py
@@ -6,7 +6,7 @@ from uuid import UUID
 from epdb.models import Rule
 from ..pagination import EnhancedPageNumberPagination
 from ..schemas import ReviewStatusFilter, RuleOutSchema
-from ..dal import get_user_entities_qs, get_package_scoped_entities_qs
+from ..dal import get_user_entities_for_read, get_package_entities_for_read
 
 router = Router()
 
@@ -22,7 +22,7 @@ def list_all_rules(request):
     List all rules from reviewed packages.
     """
     user = request.user
-    return get_user_entities_qs(Rule, user).order_by("name").all()
+    return get_user_entities_for_read(Rule, user).order_by("name").all()
 
 
 @router.get(
@@ -39,4 +39,4 @@ def list_package_rules(request, package_uuid: UUID):
     List all rules for a specific package.
     """
     user = request.user
-    return get_package_scoped_entities_qs(Rule, package_uuid, user).order_by("name").all()
+    return get_package_entities_for_read(Rule, package_uuid, user).order_by("name").all()
diff --git a/epapi/v1/endpoints/scenarios.py b/epapi/v1/endpoints/scenarios.py
index bb1c33b4..ee93c096 100644
--- a/epapi/v1/endpoints/scenarios.py
+++ b/epapi/v1/endpoints/scenarios.py
@@ -1,12 +1,22 @@
 from django.conf import settings as s
-from ninja import Router
+from django.db import IntegrityError, OperationalError, DatabaseError
+from ninja import Router, Body
+from ninja.errors import HttpError
 from ninja_extra.pagination import paginate
 from uuid import UUID
+from pydantic import ValidationError
+import logging
+import json
 
 from epdb.models import Scenario
+from epdb.logic import PackageManager
+from epdb.views import _anonymous_or_real
 from ..pagination import EnhancedPageNumberPagination
-from ..schemas import ReviewStatusFilter, ScenarioOutSchema
-from ..dal import get_user_entities_qs, get_package_scoped_entities_qs
+from ..schemas import ReviewStatusFilter, ScenarioOutSchema, ScenarioCreateSchema
+from ..dal import get_user_entities_for_read, get_package_entities_for_read
+from envipy_additional_information import registry
+
+logger = logging.getLogger(__name__)
 
 router = Router()
 
@@ -19,7 +29,7 @@ router = Router()
 )
 def list_all_scenarios(request):
     user = request.user
-    return get_user_entities_qs(Scenario, user).order_by("name").all()
+    return get_user_entities_for_read(Scenario, user).order_by("name").all()
 
 
 @router.get(
@@ -33,4 +43,82 @@ def list_all_scenarios(request):
 )
 def list_package_scenarios(request, package_uuid: UUID):
     user = request.user
-    return get_package_scoped_entities_qs(Scenario, package_uuid, user).order_by("name").all()
+    return get_package_entities_for_read(Scenario, package_uuid, user).order_by("name").all()
+
+
+@router.post("/package/{uuid:package_uuid}/scenario/", response=ScenarioOutSchema)
+def create_scenario(request, package_uuid: UUID, payload: ScenarioCreateSchema = Body(...)):
+    """Create a new scenario with optional additional information."""
+    user = _anonymous_or_real(request)
+
+    try:
+        current_package = PackageManager.get_package_by_id(user, package_uuid)
+    except ValueError as e:
+        error_msg = str(e)
+        if "does not exist" in error_msg:
+            raise HttpError(404, f"Package not found: {package_uuid}")
+        elif "Insufficient permissions" in error_msg:
+            raise HttpError(403, "You do not have permission to access this package")
+        else:
+            logger.error(f"Unexpected ValueError from get_package_by_id: {error_msg}")
+            raise HttpError(400, "Invalid package request")
+
+    # Build additional information models from payload
+    additional_information_models = []
+    validation_errors = []
+
+    for ai_item in payload.additional_information:
+        # Get model class from registry
+        model_cls = registry.get_model(ai_item.type.lower())
+        if not model_cls:
+            validation_errors.append(f"Unknown additional information type: {ai_item.type}")
+            continue
+
+        try:
+            # Validate and create model instance
+            instance = model_cls(**ai_item.data)
+            additional_information_models.append(instance)
+        except ValidationError as e:
+            # Collect validation errors to return to user
+            error_messages = [err.get("msg", "Validation error") for err in e.errors()]
+            validation_errors.append(f"{ai_item.type}: {', '.join(error_messages)}")
+        except (TypeError, AttributeError, KeyError) as e:
+            logger.warning(f"Failed to instantiate {ai_item.type} model: {str(e)}")
+            validation_errors.append(f"{ai_item.type}: Invalid data structure - {str(e)}")
+        except Exception as e:
+            logger.error(f"Unexpected error instantiating {ai_item.type}: {str(e)}")
+            validation_errors.append(f"{ai_item.type}: Failed to process - please check your data")
+
+    # If there are validation errors, return them
+    if validation_errors:
+        raise HttpError(
+            400,
+            json.dumps(
+                {
+                    "error": "Validation errors in additional information",
+                    "details": validation_errors,
+                }
+            ),
+        )
+
+    # Create scenario using the existing Scenario.create method
+    try:
+        new_scenario = Scenario.create(
+            package=current_package,
+            name=payload.name,
+            description=payload.description,
+            scenario_date=payload.scenario_date,
+            scenario_type=payload.scenario_type,
+            additional_information=additional_information_models,
+        )
+    except IntegrityError as e:
+        logger.error(f"Database integrity error creating scenario: {str(e)}")
+        raise HttpError(400, "Scenario creation failed - data constraint violation")
+    except OperationalError as e:
+        logger.error(f"Database operational error creating scenario: {str(e)}")
+        raise HttpError(503, "Database temporarily unavailable - please try again")
+    except (DatabaseError, AttributeError) as e:
+        logger.error(f"Error creating scenario: {str(e)}")
+        raise HttpError(500, "Failed to create scenario due to database error")
+
+    return new_scenario
diff --git a/epapi/v1/endpoints/structure.py b/epapi/v1/endpoints/structure.py
index 68a0d6c7..9ad4155d 100644
--- a/epapi/v1/endpoints/structure.py
+++ b/epapi/v1/endpoints/structure.py
@@ -6,8 +6,8 @@ from uuid import UUID
 from ..pagination import EnhancedPageNumberPagination
 from ..schemas import CompoundStructureOutSchema, StructureReviewStatusFilter
 from ..dal import (
-    get_user_structures_qs,
-    get_package_compound_scoped_structure_qs,
+    get_user_structure_for_read,
+    get_package_compound_structure_for_read,
 )
 
 router = Router()
@@ -26,7 +26,7 @@ def list_all_structures(request):
     List all structures from all packages.
     """
     user = request.user
-    return get_user_structures_qs(user).order_by("name").all()
+    return get_user_structure_for_read(user).order_by("name").all()
 
 
 @router.get(
@@ -44,7 +44,7 @@ def list_package_structures(request, package_uuid: UUID, compound_uuid: UUID):
     """
     user = request.user
     return (
-        get_package_compound_scoped_structure_qs(package_uuid, compound_uuid, user)
+        get_package_compound_structure_for_read(package_uuid, compound_uuid, user)
         .order_by("name")
         .all()
     )
diff --git a/epapi/v1/router.py b/epapi/v1/router.py
index fa2e7966..d9529756 100644
--- a/epapi/v1/router.py
+++ b/epapi/v1/router.py
@@ -3,15 +3,16 @@ from ninja.security import SessionAuth
 
 from .auth import BearerTokenAuth
 from .endpoints import (
-    compounds,
-    models,
     packages,
-    pathways,
-    reactions,
-    rules,
     scenarios,
-    settings,
+    compounds,
+    rules,
+    reactions,
+    pathways,
+    models,
     structure,
+    additional_information,
+    settings,
 )
 
 # Main router with authentication
@@ -31,4 +32,5 @@ router.add_router("", reactions.router)
 router.add_router("", pathways.router)
 router.add_router("", models.router)
 router.add_router("", structure.router)
+router.add_router("", additional_information.router)
 router.add_router("", settings.router)
diff --git a/epapi/v1/schemas.py b/epapi/v1/schemas.py
index 7d6ac60f..85632aae 100644
--- a/epapi/v1/schemas.py
+++ b/epapi/v1/schemas.py
@@ -1,5 +1,5 @@
 from ninja import FilterSchema, FilterLookup, Schema
-from typing import Annotated, Optional
+from typing import Annotated, Optional, List, Dict, Any
 from uuid import UUID
 
 
@@ -51,6 +51,23 @@ class ScenarioOutSchema(PackageEntityOutSchema):
     pass
 
 
+class AdditionalInformationItemSchema(Schema):
+    """Schema for additional information item in scenario creation."""
+
+    type: str
+    data: Dict[str, Any]
+
+
+class ScenarioCreateSchema(Schema):
+    """Schema for creating a new scenario."""
+
+    name: str
+    description: str = ""
+    scenario_date: str = "No date"
+    scenario_type: str = "Not specified"
+    additional_information: List[AdditionalInformationItemSchema] = []
+
+
 class CompoundOutSchema(PackageEntityOutSchema):
     pass
 
diff --git a/epdb/models.py b/epdb/models.py
index 920fd911..00fcd175 100644
--- a/epdb/models.py
+++ b/epdb/models.py
@@ -3822,11 +3822,21 @@ class Scenario(EnviPathModel):
         return new_s
 
     @transaction.atomic
-    def add_additional_information(self, data: "EnviPyModel"):
+    def add_additional_information(self, data: "EnviPyModel") -> str:
+        """
+        Add additional information to this scenario.
+
+        Args:
+            data: EnviPyModel instance to add
+
+        Returns:
+            str: UUID of the created item
+        """
         cls_name = data.__class__.__name__
         # Clean for potential XSS hidden in the additional information fields.
         ai_data = json.loads(nh3.clean(data.model_dump_json()).strip())
-        ai_data["uuid"] = f"{uuid4()}"
+        generated_uuid = str(uuid4())
+        ai_data["uuid"] = generated_uuid
 
         if cls_name not in self.additional_information:
             self.additional_information[cls_name] = []
@@ -3834,6 +3844,51 @@ class Scenario(EnviPathModel):
         self.additional_information[cls_name].append(ai_data)
         self.save()
 
+        return generated_uuid
+
+    @transaction.atomic
+    def update_additional_information(self, ai_uuid: str, data: "EnviPyModel") -> None:
+        """
+        Update existing additional information by UUID.
+
+        Args:
+            ai_uuid: UUID of the item to update
+            data: EnviPyModel instance with new data
+
+        Raises:
+            ValueError: If item with given UUID not found or type mismatch
+        """
+        found_type = None
+        found_idx = -1
+
+        # Find the item by UUID
+        for type_name, items in self.additional_information.items():
+            for idx, item_data in enumerate(items):
+                if item_data.get("uuid") == ai_uuid:
+                    found_type = type_name
+                    found_idx = idx
+                    break
+            if found_type:
+                break
+
+        if found_type is None:
+            raise ValueError(f"Additional information with UUID {ai_uuid} not found")
+
+        # Verify the model type matches (prevent type changes)
+        new_type = data.__class__.__name__
+        if new_type != found_type:
+            raise ValueError(
+                f"Cannot change type from {found_type} to {new_type}. "
+                f"Delete and create a new item instead."
+            )
+
+        # Update the item data, preserving UUID
+        ai_data = json.loads(nh3.clean(data.model_dump_json()).strip())
+        ai_data["uuid"] = ai_uuid
+
+        self.additional_information[found_type][found_idx] = ai_data
+        self.save()
+
     @transaction.atomic
     def remove_additional_information(self, ai_uuid):
         found_type = None
@@ -3848,9 +3903,9 @@ class Scenario(EnviPathModel):
 
         if found_type is not None and found_idx >= 0:
             if len(self.additional_information[found_type]) == 1:
-                del self.additional_information[k]
+                del self.additional_information[found_type]
             else:
-                self.additional_information[k].pop(found_idx)
+                self.additional_information[found_type].pop(found_idx)
             self.save()
         else:
             raise ValueError(f"Could not find additional information with uuid {ai_uuid}")
@@ -3873,7 +3928,7 @@ class Scenario(EnviPathModel):
         self.save()
 
     def get_additional_information(self):
-        from envipy_additional_information import NAME_MAPPING
+        from envipy_additional_information import registry
 
         for k, vals in self.additional_information.items():
             if k == "enzyme":
@@ -3881,7 +3936,7 @@ class Scenario(EnviPathModel):
 
             for v in vals:
                 # Per default additional fields are ignored
-                MAPPING = {c.__name__: c for c in NAME_MAPPING.values()}
+                MAPPING = {c.__name__: c for c in registry.list_models().values()}
                 inst = MAPPING[k](**v)
                 # Add uuid to uniquely identify objects for manipulation
                 if "uuid" in v:
diff --git a/epdb/views.py b/epdb/views.py
index e657ff3f..612ed2b3 100644
--- a/epdb/views.py
+++ b/epdb/views.py
@@ -11,13 +11,11 @@ from django.http import HttpResponse, HttpResponseBadRequest, HttpResponseNotAll
 from django.shortcuts import get_object_or_404, redirect, render
 from django.urls import reverse
 from django.views.decorators.csrf import csrf_exempt
-from envipy_additional_information import NAME_MAPPING
 from oauth2_provider.decorators import protected_resource
 from sentry_sdk import capture_exception
 
 from utilities.chem import FormatConverter, IndigoUtils
 from utilities.decorators import package_permission_required
-from utilities.misc import HTMLGenerator
 
 from .logic import (
     EPDBURLParser,
@@ -2455,72 +2453,7 @@ def package_scenarios(request, package_uuid):
                 }
             )
 
-        from envipy_additional_information import (
-            SEDIMENT_ADDITIONAL_INFORMATION,
-            SLUDGE_ADDITIONAL_INFORMATION,
-            SOIL_ADDITIONAL_INFORMATION,
-        )
-
-        context["scenario_types"] = {
-            "Soil Data": {
-                "name": "soil",
-                "widgets": [
-                    HTMLGenerator.generate_html(ai, prefix=f"soil_{0}")
-                    for ai in [x for sv in SOIL_ADDITIONAL_INFORMATION.values() for x in sv]
-                ],
-            },
-            "Sludge Data": {
-                "name": "sludge",
-                "widgets": [
-                    HTMLGenerator.generate_html(ai, prefix=f"sludge_{0}")
-                    for ai in [x for sv in SLUDGE_ADDITIONAL_INFORMATION.values() for x in sv]
-                ],
-            },
-            "Water-Sediment System Data": {
-                "name": "sediment",
-                "widgets": [
-                    HTMLGenerator.generate_html(ai, prefix=f"sediment_{0}")
-                    for ai in [x for sv in SEDIMENT_ADDITIONAL_INFORMATION.values() for x in sv]
-                ],
-            },
-        }
-
-        context["sludge_additional_information"] = SLUDGE_ADDITIONAL_INFORMATION
-        context["soil_additional_information"] = SOIL_ADDITIONAL_INFORMATION
-        context["sediment_additional_information"] = SEDIMENT_ADDITIONAL_INFORMATION
-
         return render(request, "collections/scenarios_paginated.html", context)
-    elif request.method == "POST":
-        log_post_params(request)
-
-        scenario_name = request.POST.get("scenario-name")
-        scenario_description = request.POST.get("scenario-description")
-
-        scenario_date_year = request.POST.get("scenario-date-year")
-        scenario_date_month = request.POST.get("scenario-date-month")
-        scenario_date_day = request.POST.get("scenario-date-day")
-
-        scenario_date = scenario_date_year
-        if scenario_date_month is not None and scenario_date_month.strip() != "":
-            scenario_date += f"-{int(scenario_date_month):02d}"
-            if scenario_date_day is not None and scenario_date_day.strip() != "":
-                scenario_date += f"-{int(scenario_date_day):02d}"
-
-        scenario_type = request.POST.get("scenario-type")
-
-        additional_information = HTMLGenerator.build_models(request.POST.dict())
-        additional_information = [x for sv in additional_information.values() for x in sv]
-
-        new_scen = Scenario.create(
-            current_package,
-            name=scenario_name,
-            description=scenario_description,
-            scenario_date=scenario_date,
-            scenario_type=scenario_type,
-            additional_information=additional_information,
-        )
-
-        return redirect(new_scen.url)
     else:
         return HttpResponseNotAllowed(
             [
@@ -2547,21 +2480,9 @@ def package_scenario(request, package_uuid, scenario_uuid):
 
         context["scenario"] = current_scenario
 
-        available_add_infs = []
-        for add_inf in NAME_MAPPING.values():
-            available_add_infs.append(
-                {
-                    "display_name": add_inf.property_name(None),
-                    "name": add_inf.__name__,
-                    "widget": HTMLGenerator.generate_html(add_inf, prefix=f"{0}"),
-                }
-            )
-        context["available_additional_information"] = available_add_infs
-
-        context["update_widgets"] = [
-            HTMLGenerator.generate_html(ai, prefix=f"{i}")
-            for i, ai in enumerate(current_scenario.get_additional_information())
-        ]
+        # Note: Modals now fetch schemas and data from API endpoints
+        # Keeping these for backwards compatibility if needed elsewhere
+        # They are no longer used by the main scenario template
 
         return render(request, "objects/scenario.html", context)
 
@@ -2581,28 +2502,15 @@ def package_scenario(request, package_uuid, scenario_uuid):
                 current_scenario.save()
                 return redirect(current_scenario.url)
             elif hidden == "set-additional-information":
-                ais = HTMLGenerator.build_models(request.POST.dict())
-
-                if s.DEBUG:
-                    logger.info(ais)
-
-                current_scenario.set_additional_information(ais)
-                return redirect(current_scenario.url)
+                # Legacy POST handler - no longer used, modals use API endpoints
+                return HttpResponseBadRequest(
+                    "This endpoint is deprecated. Please use the API endpoints."
+                )
             elif hidden == "add-additional-information":
-                ais = HTMLGenerator.build_models(request.POST.dict())
-
-                if len(ais.keys()) != 1:
-                    raise ValueError(
-                        "Only one additional information field can be added at a time."
-                    )
-
-                ai = list(ais.values())[0][0]
-
-                if s.DEBUG:
-                    logger.info(ais)
-
-                current_scenario.add_additional_information(ai)
-                return redirect(current_scenario.url)
+                # Legacy POST handler - no longer used, modals use API endpoints
+                return HttpResponseBadRequest(
+                    "This endpoint is deprecated. Please use the API endpoints."
+                )
             else:
                 return HttpResponseBadRequest()
 
diff --git a/pyproject.toml b/pyproject.toml
index 8fe196ad..a19f10d5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -19,6 +19,7 @@ dependencies = [
     "envipy-plugins",
     "epam-indigo>=1.30.1",
     "gunicorn>=23.0.0",
+    "jsonref>=1.1.0",
     "networkx>=3.4.2",
     "psycopg2-binary>=2.9.10",
     "python-dotenv>=1.1.0",
@@ -35,7 +36,7 @@ dependencies = [
 [tool.uv.sources]
 enviformer = { git = "ssh://git@git.envipath.com/enviPath/enviformer.git", rev = "v0.1.4" }
 envipy-plugins = { git = "ssh://git@git.envipath.com/enviPath/enviPy-plugins.git", rev = "v0.1.0" }
-envipy-additional-information = { git = "ssh://git@git.envipath.com/enviPath/enviPy-additional-information.git", rev = "v0.1.7" }
+envipy-additional-information = { git = "ssh://git@git.envipath.com/enviPath/enviPy-additional-information.git", rev = "v0.2.0" }
 envipy-ambit = { git = "ssh://git@git.envipath.com/enviPath/enviPy-ambit.git" }
 
 [project.optional-dependencies]
diff --git a/static/js/alpine/components/schema-form.js b/static/js/alpine/components/schema-form.js
new file mode 100644
index 00000000..1f6bd937
--- /dev/null
+++ b/static/js/alpine/components/schema-form.js
@@ -0,0 +1,253 @@
+/**
+ * Alpine.js Schema Renderer Component
+ *
+ * Renders forms dynamically from JSON Schema with RJSF format support.
+ * Supports uiSchema for widget hints, labels, help text, and field ordering.
+ *
+ * Usage:
+ * <div x-data="schemaRenderer({
+ *     rjsf: { schema: {...}, uiSchema: {...}, formData: {...}, groups: [...] },
+ *     data: { interval: { start: 20, end: 25 } },
+ *     mode: 'view', // 'view' | 'edit'
+ *     endpoint: '/api/v1/scenario/{uuid}/information/temperature/'
+ * })">
+ */
+document.addEventListener('alpine:init', () => {
+  Alpine.data('schemaRenderer', (options = {}) => ({
+    schema: null,
+    uiSchema: {},
+    data: {},
+    mode: options.mode || 'view', // 'view' | 'edit'
+    endpoint: options.endpoint || '',
+    loading: false,
+    error: null,
+    fieldErrors: {}, // Server-side field-level errors
+
+    async init() {
+      // Listen for field error events from parent modal
+      window.addEventListener('set-field-errors', (e) => {
+        // Apply to all forms (used by add modal which has only one form)
+        this.fieldErrors = e.detail || {};
+      });
+
+      // Listen for field error events targeted to a specific item (for update modal)
+      window.addEventListener('set-field-errors-for-item', (e) => {
+        // Only update if this form matches the UUID
+        const itemData = options.data || {};
+        if (itemData.uuid === e.detail?.uuid) {
+          this.fieldErrors = e.detail.fieldErrors || {};
+        }
+      });
+
+      if (options.schemaUrl) {
+        try {
+          this.loading = true;
+          const res = await fetch(options.schemaUrl);
+          if (!res.ok) {
+            throw new Error(`Failed to load schema: ${res.statusText}`);
+          }
+          const rjsf = await res.json();
+
+          // RJSF format: {schema, uiSchema, formData, groups}
+          if (!rjsf.schema) {
+            throw new Error('Invalid RJSF format: missing schema property');
+          }
+
+          this.schema = rjsf.schema;
+          this.uiSchema = rjsf.uiSchema || {};
+          this.data = options.data
+            ? JSON.parse(JSON.stringify(options.data))
+            : (rjsf.formData || {});
+        } catch (err) {
+          this.error = err.message;
+          console.error('Error loading schema:', err);
+        } finally {
+          this.loading = false;
+        }
+      } else if (options.rjsf) {
+        // Direct RJSF object passed
+        if (!options.rjsf.schema) {
+          throw new Error('Invalid RJSF format: missing schema property');
+        }
+
+        this.schema = options.rjsf.schema;
+        this.uiSchema = options.rjsf.uiSchema || {};
+        this.data = options.data
+          ? JSON.parse(JSON.stringify(options.data))
+          : (options.rjsf.formData || {});
+      }
+
+      // Initialize data from formData or options
+      if (!this.data || Object.keys(this.data).length === 0) {
+        this.data = {};
+      }
+
+      // Ensure all schema fields are properly initialized
+      if (this.schema && this.schema.properties) {
+        for (const [key, propSchema] of Object.entries(this.schema.properties)) {
+          const widget = this.getWidget(key, propSchema);
+
+          if (widget === 'interval') {
+            // Ensure interval fields are objects with start/end
+            if (!this.data[key] || typeof this.data[key] !== 'object') {
+              this.data[key] = { start: null, end: null };
+            } else {
+              // Ensure start and end exist
+              if (this.data[key].start === undefined) this.data[key].start = null;
+              if (this.data[key].end === undefined) this.data[key].end = null;
+            }
+          } else if (widget === 'timeseries-table') {
+            // Ensure timeseries fields are arrays
+            if (!this.data[key] || !Array.isArray(this.data[key])) {
+              this.data[key] = [];
+            }
+          } else if (this.data[key] === undefined) {
+            // ONLY initialize if truly undefined, not just falsy
+            // This preserves empty strings, null, 0, false as valid values
+            if (propSchema.type === 'boolean') {
+              this.data[key] = false;
+            } else if (propSchema.type === 'number' || propSchema.type === 'integer') {
+              this.data[key] = null;
+            } else if (propSchema.enum) {
+              // For select fields, use null to show placeholder
+              this.data[key] = null;
+            } else {
+              this.data[key] = '';
+            }
+          }
+          // If data[key] exists (even if empty string or null), don't overwrite
+        }
+      }
+    },
+
+    getWidget(fieldName, fieldSchema) {
+      // Check uiSchema first (RJSF format)
+      if (this.uiSchema[fieldName] && this.uiSchema[fieldName]['ui:widget']) {
+        return this.uiSchema[fieldName]['ui:widget'];
+      }
+
+      // Check for interval type (object with start/end properties)
+      if (fieldSchema.type === 'object' &&
+          fieldSchema.properties &&
+          fieldSchema.properties.start &&
+          fieldSchema.properties.end) {
+        return 'interval';
+      }
+
+      // Infer from JSON Schema type
+      if (fieldSchema.enum) return 'select';
+      if (fieldSchema.type === 'number' || fieldSchema.type === 'integer') return 'number';
+      if (fieldSchema.type === 'boolean') return 'checkbox';
+      return 'text';
+    },
+
+    getLabel(fieldName, fieldSchema) {
+      // Check uiSchema (RJSF format)
+      if (this.uiSchema[fieldName] && this.uiSchema[fieldName]['ui:label']) {
+        return this.uiSchema[fieldName]['ui:label'];
+      }
+
+      // Default: format field name
+      return fieldName.replace(/_/g, ' ').replace(/\b\w/g, c => c.toUpperCase());
+    },
+
+    getHelp(fieldName) {
+      // Get help text from uiSchema
+      if (this.uiSchema[fieldName] && this.uiSchema[fieldName]['ui:help']) {
+        return this.uiSchema[fieldName]['ui:help'];
+      }
+      return null;
+    },
+
+    getPlaceholder(fieldName) {
+      // Get placeholder from uiSchema
+      if (this.uiSchema[fieldName] && this.uiSchema[fieldName]['ui:placeholder']) {
+        return this.uiSchema[fieldName]['ui:placeholder'];
+      }
+      return null;
+    },
+
+    getFieldOrder() {
+      // Get ordered list of field names based on ui:order
+      if (!this.schema || !this.schema.properties) return [];
+
+      const fields = Object.keys(this.schema.properties);
+
+      // Sort by ui:order if available
+      return fields.sort((a, b) => {
+        const orderA = this.uiSchema[a]?.['ui:order'] || '999';
+        const orderB = this.uiSchema[b]?.['ui:order'] || '999';
+        return parseInt(orderA) - parseInt(orderB);
+      });
+    },
+
+    async submit() {
+      if (!this.endpoint) {
+        console.error('No endpoint specified for submission');
+        return;
+      }
+
+      this.loading = true;
+      this.error = null;
+
+      try {
+        const csrftoken = document.querySelector("[name=csrf-token]")?.content || '';
+        const res = await fetch(this.endpoint, {
+          method: 'POST',
+          headers: {
+            'Content-Type': 'application/json',
+            'X-CSRFToken': csrftoken
+          },
+          body: JSON.stringify(this.data)
+        });
+
+        if (!res.ok) {
+          let errorData;
+          try {
+            errorData = await res.json();
+          } catch {
+            errorData = { error: res.statusText };
+          }
+
+          // Handle validation errors (field-level)
+          this.fieldErrors = {};
+
+          // Try to parse structured error response
+          let parsedError = errorData;
+
+          // If error is a JSON string, parse it
+          if (typeof errorData.error === 'string' && errorData.error.startsWith('{')) {
+            parsedError = JSON.parse(errorData.error);
+
+          }
+
+          if (parsedError.detail && Array.isArray(parsedError.detail)) {
+            // Pydantic validation errors format: [{loc: ['field'], msg: '...', type: '...'}]
+            for (const err of parsedError.detail) {
+              const field = err.loc && err.loc.length > 0 ? err.loc[err.loc.length - 1] : 'root';
+              if (!this.fieldErrors[field]) {
+                this.fieldErrors[field] = [];
+              }
+              this.fieldErrors[field].push(err.msg || err.message || 'Validation error');
+            }
+            throw new Error('Validation failed. Please check the fields below.');
+          } else {
+            // General error
+            throw new Error(parsedError.error || parsedError.detail || `Request failed: ${res.statusText}`);
+          }
+        }
+
+        // Clear errors on success
+        this.fieldErrors = {};
+
+        const result = await res.json();
+        return result;
+      } catch (err) {
+        this.error = err.message;
+        throw err;
+      } finally {
+        this.loading = false;
+      }
+    }
+  }));
+});
diff --git a/static/js/alpine/components/widgets.js b/static/js/alpine/components/widgets.js
new file mode 100644
index 00000000..35ac6cb8
--- /dev/null
+++ b/static/js/alpine/components/widgets.js
@@ -0,0 +1,186 @@
+/**
+ * Alpine.js Widget Components for Schema Forms
+ *
+ * Centralized widget component definitions for dynamic form rendering.
+ * Each widget receives explicit parameters instead of context object for better traceability.
+ */
+document.addEventListener('alpine:init', () => {
+  // Base widget factory with common functionality
+  const baseWidget = (fieldName, data, schema, uiSchema, fieldErrors, mode) => ({
+    fieldName,
+    data,
+    schema,
+    uiSchema,
+    fieldErrors,
+    mode,
+
+    // Field schema access
+    get fieldSchema() {
+      return this.schema?.properties?.[this.fieldName] || {};
+    },
+
+    // Common metadata
+    get label() {
+      // Check uiSchema first (RJSF format)
+      if (this.uiSchema?.[this.fieldName]?.['ui:label']) {
+        return this.uiSchema[this.fieldName]['ui:label'];
+      }
+      // Fall back to schema title
+      if (this.fieldSchema.title) {
+        return this.fieldSchema.title;
+      }
+      // Default: format field name
+      return this.fieldName.replace(/_/g, ' ').replace(/\b\w/g, c => c.toUpperCase());
+    },
+    get helpText() {
+      return this.fieldSchema.description || '';
+    },
+
+    // Field-level unit extraction from uiSchema (RJSF format)
+    get unit() {
+      return this.uiSchema?.[this.fieldName]?.['ui:unit'] || null;
+    },
+
+    // Error handling
+    get hasError() {
+      return !!this.fieldErrors?.[this.fieldName];
+    },
+    get errors() {
+      return this.fieldErrors?.[this.fieldName] || [];
+    },
+
+    // Mode checks
+    get isViewMode() { return this.mode === 'view'; },
+    get isEditMode() { return this.mode === 'edit'; },
+  });
+
+  // Text widget
+  Alpine.data('textWidget', (fieldName, data, schema, uiSchema, fieldErrors, mode) => ({
+    ...baseWidget(fieldName, data, schema, uiSchema, fieldErrors, mode),
+
+    get value() { return this.data[this.fieldName] || ''; },
+    set value(v) { this.data[this.fieldName] = v; },
+  }));
+
+  // Textarea widget
+  Alpine.data('textareaWidget', (fieldName, data, schema, uiSchema, fieldErrors, mode) => ({
+    ...baseWidget(fieldName, data, schema, uiSchema, fieldErrors, mode),
+
+    get value() { return this.data[this.fieldName] || ''; },
+    set value(v) { this.data[this.fieldName] = v; },
+  }));
+
+  // Number widget with unit support
+  Alpine.data('numberWidget', (fieldName, data, schema, uiSchema, fieldErrors, mode) => ({
+    ...baseWidget(fieldName, data, schema, uiSchema, fieldErrors, mode),
+
+    get value() { return this.data[this.fieldName]; },
+    set value(v) {
+      this.data[this.fieldName] = v === '' || v === null ? null : parseFloat(v);
+    },
+    get hasValue() {
+      return this.value !== null && this.value !== undefined && this.value !== '';
+    },
+    // Format value with unit for view mode
+    get displayValue() {
+      if (!this.hasValue) return '—';
+      return this.unit ? `${this.value} ${this.unit}` : String(this.value);
+    },
+  }));
+
+  // Select widget
+  Alpine.data('selectWidget', (fieldName, data, schema, uiSchema, fieldErrors, mode) => ({
+    ...baseWidget(fieldName, data, schema, uiSchema, fieldErrors, mode),
+
+    get value() { return this.data[this.fieldName] || ''; },
+    set value(v) { this.data[this.fieldName] = v; },
+    get options() { return this.fieldSchema.enum || []; },
+  }));
+
+  // Checkbox widget
+  Alpine.data('checkboxWidget', (fieldName, data, schema, uiSchema, fieldErrors, mode) => ({
+    ...baseWidget(fieldName, data, schema, uiSchema, fieldErrors, mode),
+
+    get checked() { return !!this.data[this.fieldName]; },
+    set checked(v) { this.data[this.fieldName] = v; },
+  }));
+
+  // Interval widget with unit support
+  Alpine.data('intervalWidget', (fieldName, data, schema, uiSchema, fieldErrors, mode) => ({
+    ...baseWidget(fieldName, data, schema, uiSchema, fieldErrors, mode),
+
+    get start() {
+      return this.data[this.fieldName]?.start ?? null;
+    },
+    set start(v) {
+      if (!this.data[this.fieldName]) this.data[this.fieldName] = {};
+      this.data[this.fieldName].start = v === '' || v === null ? null : parseFloat(v);
+    },
+    get end() {
+      return this.data[this.fieldName]?.end ?? null;
+    },
+    set end(v) {
+      if (!this.data[this.fieldName]) this.data[this.fieldName] = {};
+      this.data[this.fieldName].end = v === '' || v === null ? null : parseFloat(v);
+    },
+    // Format interval with unit for view mode
+    get displayValue() {
+      const s = this.start, e = this.end;
+      const unitStr = this.unit ? ` ${this.unit}` : '';
+
+      if (s !== null && e !== null) return `${s} – ${e}${unitStr}`;
+      if (s !== null) return `≥ ${s}${unitStr}`;
+      if (e !== null) return `≤ ${e}${unitStr}`;
+      return '—';
+    },
+
+    get isSameValue() {
+      return this.start !== null && this.start === this.end;
+    },
+
+    // Validation: start must be <= end
+    get hasValidationError() {
+      if (this.isViewMode) return false;
+      const s = this.start;
+      const e = this.end;
+      // Only validate if both values are provided
+      if (s !== null && e !== null && typeof s === 'number' && typeof e === 'number') {
+        return s > e;
+      }
+      return false;
+    },
+
+    // Override hasError to include validation error
+    get hasError() {
+      return this.hasValidationError || !!this.fieldErrors?.[this.fieldName];
+    },
+
+    // Override errors to include validation error message
+    get errors() {
+      const serverErrors = this.fieldErrors?.[this.fieldName] || [];
+      const validationErrors = this.hasValidationError
+        ? ['Start value must be less than or equal to end value']
+        : [];
+      return [...validationErrors, ...serverErrors];
+    },
+  }));
+
+  // PubMed link widget
+  Alpine.data('pubmedWidget', (fieldName, data, schema, uiSchema, fieldErrors, mode) => ({
+    ...baseWidget(fieldName, data, schema, uiSchema, fieldErrors, mode),
+
+    get value() { return this.data[this.fieldName] || ''; },
+    set value(v) { this.data[this.fieldName] = v; },
+    get pubmedUrl() {
+      return this.value ? `https://pubmed.ncbi.nlm.nih.gov/${this.value}` : null;
+    },
+  }));
+
+  // Compound link widget
+  Alpine.data('compoundWidget', (fieldName, data, schema, uiSchema, fieldErrors, mode) => ({
+    ...baseWidget(fieldName, data, schema, uiSchema, fieldErrors, mode),
+
+    get value() { return this.data[this.fieldName] || ''; },
+    set value(v) { this.data[this.fieldName] = v; },
+  }));
+});
diff --git a/static/js/api/additional-information.js b/static/js/api/additional-information.js
new file mode 100644
index 00000000..827d1995
--- /dev/null
+++ b/static/js/api/additional-information.js
@@ -0,0 +1,394 @@
+/**
+ * Unified API client for Additional Information endpoints
+ * Provides consistent error handling, logging, and CRUD operations
+ */
+window.AdditionalInformationApi = {
+  // Configuration
+  _debug: false,
+
+  /**
+   * Enable or disable debug logging
+   * @param {boolean} enabled - Whether to enable debug mode
+   */
+  setDebug(enabled) {
+    this._debug = enabled;
+  },
+
+  /**
+   * Internal logging helper
+   * @private
+   */
+  _log(action, data) {
+    if (this._debug) {
+      console.log(`[AdditionalInformationApi] ${action}:`, data);
+    }
+  },
+  //FIXME: this has the side effect of users not being able to explicitly set an empty string for a field.
+  /**
+   * Remove empty strings from payload recursively
+   * @param {any} value
+   * @returns {any}
+   */
+  sanitizePayload(value) {
+    if (Array.isArray(value)) {
+      return value
+        .map(item => this.sanitizePayload(item))
+        .filter(item => item !== '');
+    }
+
+    if (value && typeof value === 'object') {
+      const cleaned = {};
+      for (const [key, item] of Object.entries(value)) {
+        if (item === '') continue;
+        cleaned[key] = this.sanitizePayload(item);
+      }
+      return cleaned;
+    }
+
+    return value;
+  },
+
+  /**
+   * Get CSRF token from meta tag
+   * @returns {string} CSRF token
+   */
+  getCsrfToken() {
+    return document.querySelector('[name=csrf-token]')?.content || '';
+  },
+
+  /**
+   * Build headers for API requests
+   * @private
+   */
+  _buildHeaders(includeContentType = true) {
+    const headers = {
+      'X-CSRFToken': this.getCsrfToken()
+    };
+    if (includeContentType) {
+      headers['Content-Type'] = 'application/json';
+    }
+    return headers;
+  },
+
+  /**
+   * Handle API response with consistent error handling
+   * @private
+   */
+  async _handleResponse(response, action) {
+    if (!response.ok) {
+      let errorData;
+      try {
+        errorData = await response.json();
+      } catch {
+        errorData = { error: response.statusText };
+      }
+
+      // Try to parse the error if it's a JSON string
+      let parsedError = errorData;
+      if (typeof errorData.error === 'string' && errorData.error.startsWith('{')) {
+        try {
+          parsedError = JSON.parse(errorData.error);
+        } catch {
+          // Not JSON, use as-is
+        }
+      }
+
+      // If it's a structured validation error, throw with field errors
+      if (parsedError.type === 'validation_error' && parsedError.field_errors) {
+        this._log(`${action} VALIDATION ERROR`, parsedError);
+        const error = new Error(parsedError.message || 'Validation failed');
+        error.fieldErrors = parsedError.field_errors;
+        error.isValidationError = true;
+        throw error;
+      }
+
+      // General error
+      const errorMsg = parsedError.message || parsedError.error || parsedError.detail || `${action} failed: ${response.statusText}`;
+      this._log(`${action} ERROR`, { status: response.status, error: errorMsg });
+      throw new Error(errorMsg);
+    }
+
+    const data = await response.json();
+    this._log(`${action} SUCCESS`, data);
+    return data;
+  },
+
+  /**
+   * Load all available schemas
+   * @returns {Promise<Object>} Object with schema definitions
+   */
+  async loadSchemas() {
+    this._log('loadSchemas', 'Starting...');
+    const response = await fetch('/api/v1/information/schema/');
+    return this._handleResponse(response, 'loadSchemas');
+  },
+
+  /**
+   * Load additional information items for a scenario
+   * @param {string} scenarioUuid - UUID of the scenario
+   * @returns {Promise<Array>} Array of additional information items
+   */
+  async loadItems(scenarioUuid) {
+    this._log('loadItems', { scenarioUuid });
+    const response = await fetch(`/api/v1/scenario/${scenarioUuid}/information/`);
+    return this._handleResponse(response, 'loadItems');
+  },
+
+  /**
+   * Load both schemas and items in parallel
+   * @param {string} scenarioUuid - UUID of the scenario
+   * @returns {Promise<{schemas: Object, items: Array}>}
+   */
+  async loadSchemasAndItems(scenarioUuid) {
+    this._log('loadSchemasAndItems', { scenarioUuid });
+
+    const [schemas, items] = await Promise.all([
+      this.loadSchemas(),
+      this.loadItems(scenarioUuid)
+    ]);
+
+    return { schemas, items };
+  },
+
+  /**
+   * Create new additional information for a scenario
+   * @param {string} scenarioUuid - UUID of the scenario
+   * @param {string} modelName - Name/type of the additional information model
+   * @param {Object} data - Data for the new item
+   * @returns {Promise<{status: string, uuid: string}>}
+   */
+  async createItem(scenarioUuid, modelName, data) {
+    const sanitizedData = this.sanitizePayload(data);
+    this._log('createItem', { scenarioUuid, modelName, data: sanitizedData });
+
+    // Normalize model name to lowercase
+    const normalizedName = modelName.toLowerCase();
+
+    const response = await fetch(
+      `/api/v1/scenario/${scenarioUuid}/information/${normalizedName}/`,
+      {
+        method: 'POST',
+        headers: this._buildHeaders(),
+        body: JSON.stringify(sanitizedData)
+      }
+    );
+
+    return this._handleResponse(response, 'createItem');
+  },
+
+  /**
+   * Delete additional information from a scenario
+   * @param {string} scenarioUuid - UUID of the scenario
+   * @param {string} itemUuid - UUID of the item to delete
+   * @returns {Promise<{status: string}>}
+   */
+  async deleteItem(scenarioUuid, itemUuid) {
+    this._log('deleteItem', { scenarioUuid, itemUuid });
+
+    const response = await fetch(
+      `/api/v1/scenario/${scenarioUuid}/information/item/${itemUuid}/`,
+      {
+        method: 'DELETE',
+        headers: this._buildHeaders(false)
+      }
+    );
+
+    return this._handleResponse(response, 'deleteItem');
+  },
+
+  /**
+   * Update existing additional information
+   * Tries PATCH first, falls back to delete+recreate if not supported
+   * @param {string} scenarioUuid - UUID of the scenario
+   * @param {Object} item - Item object with uuid, type, and data properties
+   * @returns {Promise<{status: string, uuid: string}>}
+   */
+  async updateItem(scenarioUuid, item) {
+    const sanitizedData = this.sanitizePayload(item.data);
+    this._log('updateItem', { scenarioUuid, item: { ...item, data: sanitizedData } });
+
+    const { uuid, type } = item;
+
+    // Try PATCH first (preferred method - preserves UUID)
+    const response = await fetch(
+      `/api/v1/scenario/${scenarioUuid}/information/item/${uuid}/`,
+      {
+        method: 'PATCH',
+        headers: this._buildHeaders(),
+        body: JSON.stringify(sanitizedData)
+      }
+    );
+
+    if (response.status === 405) {
+      // PATCH not supported, fall back to delete+recreate
+      this._log('updateItem', 'PATCH not supported, falling back to delete+recreate');
+      await this.deleteItem(scenarioUuid, uuid);
+      return await this.createItem(scenarioUuid, type, sanitizedData);
+    }
+
+    return this._handleResponse(response, 'updateItem');
+  },
+
+  /**
+   * Update multiple items sequentially to avoid race conditions
+   * @param {string} scenarioUuid - UUID of the scenario
+   * @param {Array<Object>} items - Array of items to update
+   * @returns {Promise<Array>} Array of results with success status
+   */
+  async updateItems(scenarioUuid, items) {
+    this._log('updateItems', { scenarioUuid, itemCount: items.length });
+
+    const results = [];
+    for (const item of items) {
+      try {
+        const result = await this.updateItem(scenarioUuid, item);
+        results.push({ success: true, oldUuid: item.uuid, newUuid: result.uuid });
+      } catch (error) {
+        results.push({
+          success: false,
+          oldUuid: item.uuid,
+          error: error.message,
+          fieldErrors: error.fieldErrors,
+          isValidationError: error.isValidationError
+        });
+      }
+    }
+
+    const failed = results.filter(r => !r.success);
+    if (failed.length > 0) {
+      // If all failures are validation errors, throw a validation error
+      const validationErrors = failed.filter(f => f.isValidationError);
+      if (validationErrors.length === failed.length && failed.length === 1) {
+        // Single validation error - preserve field errors for display
+        const error = new Error(failed[0].error);
+        error.fieldErrors = failed[0].fieldErrors;
+        error.isValidationError = true;
+        error.itemUuid = failed[0].oldUuid;
+        throw error;
+      }
+      // Multiple failures or mixed errors - show count
+      throw new Error(`Failed to update ${failed.length} item(s). Please check the form for errors.`);
+    }
+
+    return results;
+  },
+
+  /**
+   * Create a new scenario with optional additional information
+   * @param {string} packageUuid - UUID of the package
+   * @param {Object} payload - Scenario data matching ScenarioCreateSchema
+   * @param {string} payload.name - Scenario name (required)
+   * @param {string} payload.description - Scenario description (optional, default: "")
+   * @param {string} payload.scenario_date - Scenario date (optional, default: "No date")
+   * @param {string} payload.scenario_type - Scenario type (optional, default: "Not specified")
+   * @param {Array} payload.additional_information - Array of additional information (optional, default: [])
+   * @returns {Promise<{uuid, url, name, description, review_status, package}>}
+   */
+  async createScenario(packageUuid, payload) {
+    this._log('createScenario', { packageUuid, payload });
+    const response = await fetch(
+      `/api/v1/package/${packageUuid}/scenario/`,
+      {
+        method: 'POST',
+        headers: this._buildHeaders(),
+        body: JSON.stringify(payload)
+      }
+    );
+    return this._handleResponse(response, 'createScenario');
+  },
+
+  /**
+   * Load all available group names
+   * @returns {Promise<{groups: string[]}>}
+   */
+  async loadGroups() {
+    this._log('loadGroups', 'Starting...');
+    const response = await fetch('/api/v1/information/groups/');
+    return this._handleResponse(response, 'loadGroups');
+  },
+
+  /**
+   * Load model definitions for a specific group
+   * @param {string} groupName - One of 'soil', 'sludge', 'sediment'
+   * @returns {Promise<Object>} Object with subcategories as keys and arrays of model info
+   */
+  async loadGroupModels(groupName) {
+    this._log('loadGroupModels', { groupName });
+    const response = await fetch(`/api/v1/information/groups/${groupName}/`);
+    return this._handleResponse(response, `loadGroupModels-${groupName}`);
+  },
+
+  /**
+   * Load model information for multiple groups in parallel
+   * @param {Array<string>} groupNames - Defaults to ['soil', 'sludge', 'sediment']
+   * @returns {Promise<Object>} Object with group names as keys
+   */
+  async loadGroupsWithModels(groupNames = ['soil', 'sludge', 'sediment']) {
+    this._log('loadGroupsWithModels', { groupNames });
+
+    const results = {};
+    const promises = groupNames.map(async (groupName) => {
+      try {
+        results[groupName] = await this.loadGroupModels(groupName);
+      } catch (err) {
+        this._log(`loadGroupsWithModels-${groupName} ERROR`, err);
+        results[groupName] = {};
+      }
+    });
+
+    await Promise.all(promises);
+    return results;
+  },
+
+  /**
+   * Helper to organize schemas by group based on group model information
+   * @param {Object} schemas - Full schema map from loadSchemas()
+   * @param {Object} groupModelsData - Group models data from loadGroupsWithModels()
+   * @returns {Object} Object with group names as keys and filtered schemas as values
+   */
+  organizeSchemasByGroup(schemas, groupModelsData) {
+    this._log('organizeSchemasByGroup', {
+      schemaCount: Object.keys(schemas).length,
+      groupCount: Object.keys(groupModelsData).length
+    });
+
+    const organized = {};
+
+    for (const groupName in groupModelsData) {
+      organized[groupName] = {};
+      const groupData = groupModelsData[groupName];
+
+      // Iterate through subcategories in the group
+      for (const subcategory in groupData) {
+        for (const model of groupData[subcategory]) {
+          // Look up schema by lowercase model name
+          if (schemas[model.name]) {
+            organized[groupName][model.name] = schemas[model.name];
+          }
+        }
+      }
+    }
+
+    return organized;
+  },
+
+  /**
+   * Convenience method that loads schemas and organizes them by group in one call
+   * @param {Array<string>} groupNames - Defaults to ['soil', 'sludge', 'sediment']
+   * @returns {Promise<{schemas, groupSchemas, groupModels}>}
+   */
+  async loadSchemasWithGroups(groupNames = ['soil', 'sludge', 'sediment']) {
+    this._log('loadSchemasWithGroups', { groupNames });
+
+    // Load schemas and all groups in parallel
+    const [schemas, groupModels] = await Promise.all([
+      this.loadSchemas(),
+      this.loadGroupsWithModels(groupNames)
+    ]);
+
+    // Organize schemas by group
+    const groupSchemas = this.organizeSchemasByGroup(schemas, groupModels);
+
+    return { schemas, groupSchemas, groupModels };
+  }
+};
diff --git a/templates/collections/scenarios_paginated.html b/templates/collections/scenarios_paginated.html
index f66af62e..2d1d19b2 100644
--- a/templates/collections/scenarios_paginated.html
+++ b/templates/collections/scenarios_paginated.html
@@ -1,7 +1,15 @@
 {% extends "collections/paginated_base.html" %}
+{% load static %}
 
 {% block page_title %}Scenarios{% endblock %}
 
+{% block action_modals %}
+  {# Load required scripts before modal #}
+  <script src="{% static 'js/alpine/components/widgets.js' %}"></script>
+  <script src="{% static 'js/api/additional-information.js' %}"></script>
+  {% include "modals/collections/new_scenario_modal.html" %}
+{% endblock action_modals %}
+
 {% block action_button %}
   {% if meta.can_edit %}
     <button
@@ -14,10 +22,6 @@
   {% endif %}
 {% endblock action_button %}
 
-{% block action_modals %}
-  {% include "modals/collections/new_scenario_modal.html" %}
-{% endblock action_modals %}
-
 {% block description %}
   <p>
     A scenario contains meta-information that can be attached to other data
diff --git a/templates/components/modals/error_state.html b/templates/components/modals/error_state.html
new file mode 100644
index 00000000..348b7c9c
--- /dev/null
+++ b/templates/components/modals/error_state.html
@@ -0,0 +1,5 @@
+<template x-if="{{ error_var }}">
+  <div class="alert alert-error mb-4">
+    <span x-text="{{ error_var }}"></span>
+  </div>
+</template>
diff --git a/templates/components/modals/loading_state.html b/templates/components/modals/loading_state.html
new file mode 100644
index 00000000..33675981
--- /dev/null
+++ b/templates/components/modals/loading_state.html
@@ -0,0 +1,5 @@
+<template x-if="{{ loading_var }}">
+  <div class="flex justify-center items-center p-4">
+    <span class="loading loading-spinner loading-md"></span>
+  </div>
+</template>
diff --git a/templates/components/schema_form.html b/templates/components/schema_form.html
new file mode 100644
index 00000000..7b897320
--- /dev/null
+++ b/templates/components/schema_form.html
@@ -0,0 +1,135 @@
+{% load static %}
+
+<div>
+  <!-- Loading state -->
+  <template x-if="loading">
+    <div class="flex items-center justify-center p-4">
+      <span class="loading loading-spinner loading-md"></span>
+    </div>
+  </template>
+
+  <!-- Error state -->
+  <template x-if="error">
+    <div class="alert alert-error mb-4">
+      <span x-text="error"></span>
+    </div>
+  </template>
+
+  <!-- Schema form -->
+  <template x-if="schema && !loading">
+    <div class="space-y-4">
+      <!-- Title from schema -->
+      <template x-if="schema['x-title'] || schema.title">
+        <h4
+          class="text-lg font-semibold"
+          x-text="schema['x-title'] || schema.title"
+        ></h4>
+      </template>
+
+      <!-- Render each field (ordered by ui:order) -->
+      <template x-for="fieldName in getFieldOrder()" :key="fieldName">
+        <div>
+          <!-- Text widget -->
+          <template
+            x-if="getWidget(fieldName, schema.properties[fieldName]) === 'text'"
+          >
+            <div
+              x-data="textWidget(fieldName, data, schema, uiSchema, fieldErrors, mode)"
+            >
+              {% include "components/widgets/text_widget.html" %}
+            </div>
+          </template>
+
+          <!-- Textarea widget -->
+          <template
+            x-if="getWidget(fieldName, schema.properties[fieldName]) === 'textarea'"
+          >
+            <div
+              x-data="textareaWidget(fieldName, data, schema, uiSchema, fieldErrors, mode)"
+            >
+              {% include "components/widgets/textarea_widget.html" %}
+            </div>
+          </template>
+
+          <!-- Number widget -->
+          <template
+            x-if="getWidget(fieldName, schema.properties[fieldName]) === 'number'"
+          >
+            <div
+              x-data="numberWidget(fieldName, data, schema, uiSchema, fieldErrors, mode)"
+            >
+              {% include "components/widgets/number_widget.html" %}
+            </div>
+          </template>
+
+          <!-- Select widget -->
+          <template
+            x-if="getWidget(fieldName, schema.properties[fieldName]) === 'select'"
+          >
+            <div
+              x-data="selectWidget(fieldName, data, schema, uiSchema, fieldErrors, mode)"
+            >
+              {% include "components/widgets/select_widget.html" %}
+            </div>
+          </template>
+
+          <!-- Checkbox widget -->
+          <template
+            x-if="getWidget(fieldName, schema.properties[fieldName]) === 'checkbox'"
+          >
+            <div
+              x-data="checkboxWidget(fieldName, data, schema, uiSchema, fieldErrors, mode)"
+            >
+              {% include "components/widgets/checkbox_widget.html" %}
+            </div>
+          </template>
+
+          <!-- Interval widget -->
+          <template
+            x-if="getWidget(fieldName, schema.properties[fieldName]) === 'interval'"
+          >
+            <div
+              x-data="intervalWidget(fieldName, data, schema, uiSchema, fieldErrors, mode)"
+            >
+              {% include "components/widgets/interval_widget.html" %}
+            </div>
+          </template>
+
+          <!-- PubMed link widget -->
+          <template
+            x-if="getWidget(fieldName, schema.properties[fieldName]) === 'pubmed-link'"
+          >
+            <div
+              x-data="pubmedWidget(fieldName, data, schema, uiSchema, fieldErrors, mode)"
+            >
+              {% include "components/widgets/pubmed_link_widget.html" %}
+            </div>
+          </template>
+
+          <!-- Compound link widget -->
+          <template
+            x-if="getWidget(fieldName, schema.properties[fieldName]) === 'compound-link'"
+          >
+            <div
+              x-data="compoundWidget(fieldName, data, schema, uiSchema, fieldErrors, mode)"
+            >
+              {% include "components/widgets/compound_link_widget.html" %}
+            </div>
+          </template>
+        </div>
+      </template>
+
+      <!-- Submit button (only in edit mode with endpoint) -->
+      <template x-if="mode === 'edit' && endpoint">
+        <div class="form-control mt-4">
+          <button class="btn btn-primary" @click="submit()" :disabled="loading">
+            <template x-if="loading">
+              <span class="loading loading-spinner loading-sm"></span>
+            </template>
+            <span x-text="loading ? 'Submitting...' : 'Submit'"></span>
+          </button>
+        </div>
+      </template>
+    </div>
+  </template>
+</div>
diff --git a/templates/components/widgets/checkbox_widget.html b/templates/components/widgets/checkbox_widget.html
new file mode 100644
index 00000000..be2059e6
--- /dev/null
+++ b/templates/components/widgets/checkbox_widget.html
@@ -0,0 +1,50 @@
+{# Checkbox widget - pure HTML template #}
+<div class="form-control">
+  <div class="flex flex-col gap-2 sm:flex-row sm:items-baseline">
+    <!-- Label -->
+    <label class="label sm:w-48 sm:shrink-0">
+      <span
+        class="label-text"
+        :class="{
+              'text-error': hasError,
+              'text-sm text-base-content/60': isViewMode
+            }"
+        x-text="label"
+      ></span>
+    </label>
+
+    <!-- Input column -->
+    <div class="flex-1">
+      <!-- Help text -->
+      <template x-if="helpText">
+        <div class="label">
+          <span
+            class="label-text-alt text-base-content/60"
+            x-text="helpText"
+          ></span>
+        </div>
+      </template>
+
+      <!-- View mode -->
+      <template x-if="isViewMode">
+        <div class="mt-1">
+          <span class="text-base" x-text="checked ? 'Yes' : 'No'"></span>
+        </div>
+      </template>
+
+      <!-- Edit mode -->
+      <template x-if="isEditMode">
+        <input type="checkbox" class="checkbox" x-model="checked" />
+      </template>
+
+      <!-- Errors -->
+      <template x-if="hasError">
+        <div class="label">
+          <template x-for="errMsg in errors" :key="errMsg">
+            <span class="label-text-alt text-error" x-text="errMsg"></span>
+          </template>
+        </div>
+      </template>
+    </div>
+  </div>
+</div>
diff --git a/templates/components/widgets/compound_link_widget.html b/templates/components/widgets/compound_link_widget.html
new file mode 100644
index 00000000..4bd43624
--- /dev/null
+++ b/templates/components/widgets/compound_link_widget.html
@@ -0,0 +1,66 @@
+{# Compound link widget - pure HTML template #}
+<div class="form-control">
+  <div class="flex flex-col gap-2 sm:flex-row sm:items-baseline">
+    <!-- Label -->
+    <label class="label sm:w-48 sm:shrink-0">
+      <span
+        class="label-text"
+        :class="{
+              'text-error': hasError,
+              'text-sm text-base-content/60': isViewMode
+            }"
+        x-text="label"
+      ></span>
+    </label>
+
+    <!-- Input column -->
+    <div class="flex-1">
+      <!-- Help text -->
+      <template x-if="helpText">
+        <div class="label">
+          <span
+            class="label-text-alt text-base-content/60"
+            x-text="helpText"
+          ></span>
+        </div>
+      </template>
+
+      <!-- View mode: display as link -->
+      <template x-if="isViewMode">
+        <div class="mt-1">
+          <template x-if="value">
+            <a
+              :href="value"
+              class="link link-primary break-all"
+              target="_blank"
+              x-text="value"
+            ></a>
+          </template>
+          <template x-if="!value">
+            <span class="text-base-content/50">—</span>
+          </template>
+        </div>
+      </template>
+
+      <!-- Edit mode -->
+      <template x-if="isEditMode">
+        <input
+          type="url"
+          class="input input-bordered w-full"
+          :class="{ 'input-error': hasError }"
+          placeholder="Compound URL"
+          x-model="value"
+        />
+      </template>
+
+      <!-- Errors -->
+      <template x-if="hasError">
+        <div class="label">
+          <template x-for="errMsg in errors" :key="errMsg">
+            <span class="label-text-alt text-error" x-text="errMsg"></span>
+          </template>
+        </div>
+      </template>
+    </div>
+  </div>
+</div>
diff --git a/templates/components/widgets/interval_widget.html b/templates/components/widgets/interval_widget.html
new file mode 100644
index 00000000..46c2e025
--- /dev/null
+++ b/templates/components/widgets/interval_widget.html
@@ -0,0 +1,76 @@
+{# Interval widget for range inputs - pure HTML template #}
+<div class="form-control">
+  <div class="flex flex-col gap-2 sm:flex-row sm:items-baseline">
+    <!-- Label -->
+    <label class="label sm:w-48 sm:shrink-0">
+      <span
+        class="label-text"
+        :class="{
+              'text-error': hasError,
+              'text-sm text-base-content/60': isViewMode
+            }"
+        x-text="label"
+      ></span>
+    </label>
+
+    <!-- Input column -->
+    <div class="flex-1">
+      <!-- Help text -->
+      <template x-if="helpText">
+        <div class="label">
+          <span
+            class="label-text-alt text-base-content/60"
+            x-text="helpText"
+          ></span>
+        </div>
+      </template>
+
+      <!-- View mode: formatted range with unit -->
+      <template x-if="isViewMode">
+        <div class="mt-1">
+          <span class="text-base" x-text="start"></span>
+          <span class="text-base-content/60 text-xs" x-show="!isSameValue"
+            >to</span
+          >
+          <span class="text-base" x-text="end" x-show="!isSameValue"></span>
+          <template x-if="start && end && unit">
+            <span class="text-xs" x-text="unit"></span>
+          </template>
+        </div>
+      </template>
+
+      <!-- Edit mode: two inputs with shared unit badge -->
+      <template x-if="isEditMode">
+        <div class="flex gap-2 items-center">
+          <input
+            type="number"
+            class="input input-bordered flex-1"
+            :class="{ 'input-error': hasError }"
+            placeholder="Min"
+            x-model="start"
+          />
+          <span class="text-base-content/60">to</span>
+          <input
+            type="number"
+            class="input input-bordered flex-1"
+            :class="{ 'input-error': hasError }"
+            placeholder="Max"
+            x-model="end"
+          />
+          <template x-if="unit">
+            <span class="badge badge-ghost badge-lg" x-text="unit"></span>
+          </template>
+        </div>
+      </template>
+
+      <!-- Errors -->
+      <template x-if="hasError">
+        <div class="label">
+          <template x-for="errMsg in errors" :key="errMsg">
+            <span class="label-text-alt text-error" x-text="errMsg"></span>
+          </template>
+        </div>
+      </template>
+    </div>
+  </div>
+</div>
diff --git a/templates/components/widgets/number_widget.html b/templates/components/widgets/number_widget.html
new file mode 100644
index 00000000..6ec1a502
--- /dev/null
+++ b/templates/components/widgets/number_widget.html
@@ -0,0 +1,66 @@
+{# Number input widget - pure HTML template #}
+<div class="form-control">
+  <div class="flex flex-col gap-2 sm:flex-row sm:items-baseline">
+    <!-- Label -->
+    <label class="label sm:w-48 sm:shrink-0">
+      <span
+        class="label-text"
+        :class="{
+              'text-error': hasError,
+              'text-sm text-base-content/60': isViewMode
+            }"
+        x-text="label"
+      ></span>
+    </label>
+
+    <!-- Input column -->
+    <div class="flex-1">
+      <!-- Help text -->
+      <template x-if="helpText">
+        <div class="label">
+          <span
+            class="label-text-alt text-base-content/60"
+            x-text="helpText"
+          ></span>
+        </div>
+      </template>
+
+      <!-- View mode: show value with unit -->
+      <template x-if="isViewMode">
+        <div class="mt-1">
+          <span class="text-base" x-text="value"></span>
+          <template x-if="value && unit">
+            <span class="text-xs" x-text="unit"></span>
+          </template>
+        </div>
+      </template>
+
+      <!-- Edit mode: input with unit suffix -->
+      <template x-if="isEditMode">
+        <div :class="unit ? 'join w-full' : ''">
+          <input
+            type="number"
+            :class="unit ? 'input input-bordered join-item flex-1' : 'input input-bordered w-full'"
+            class:input-error="hasError"
+            x-model="value"
+          />
+          <template x-if="unit">
+            <span
+              class="btn btn-ghost join-item no-animation pointer-events-none"
+              x-text="unit"
+            ></span>
+          </template>
+        </div>
+      </template>
+
+      <!-- Errors -->
+      <template x-if="hasError">
+        <div class="label">
+          <template x-for="errMsg in errors" :key="errMsg">
+            <span class="label-text-alt text-error" x-text="errMsg"></span>
+          </template>
+        </div>
+      </template>
+    </div>
+  </div>
+</div>
diff --git a/templates/components/widgets/pubmed_link_widget.html b/templates/components/widgets/pubmed_link_widget.html
new file mode 100644
index 00000000..a91e4f1d
--- /dev/null
+++ b/templates/components/widgets/pubmed_link_widget.html
@@ -0,0 +1,66 @@
+{# PubMed link widget - pure HTML template #}
+<div class="form-control">
+  <div class="flex flex-col gap-2 sm:flex-row sm:items-baseline">
+    <!-- Label -->
+    <label class="label sm:w-48 sm:shrink-0">
+      <span
+        class="label-text"
+        :class="{
+              'text-error': hasError,
+              'text-sm text-base-content/60': isViewMode
+            }"
+        x-text="label"
+      ></span>
+    </label>
+
+    <!-- Input column -->
+    <div class="flex-1">
+      <!-- Help text -->
+      <template x-if="helpText">
+        <div class="label">
+          <span
+            class="label-text-alt text-base-content/60"
+            x-text="helpText"
+          ></span>
+        </div>
+      </template>
+
+      <!-- View mode: display as link -->
+      <template x-if="isViewMode">
+        <div class="mt-1">
+          <template x-if="value && pubmedUrl">
+            <a
+              :href="pubmedUrl"
+              class="link link-primary"
+              target="_blank"
+              x-text="value"
+            ></a>
+          </template>
+          <template x-if="!value">
+            <span class="text-base-content/50">—</span>
+          </template>
+        </div>
+      </template>
+
+      <!-- Edit mode -->
+      <template x-if="isEditMode">
+        <input
+          type="text"
+          class="input input-bordered w-full"
+          :class="{ 'input-error': hasError }"
+          placeholder="PubMed ID"
+          x-model="value"
+        />
+      </template>
+
+      <!-- Errors -->
+      <template x-if="hasError">
+        <div class="label">
+          <template x-for="errMsg in errors" :key="errMsg">
+            <span class="label-text-alt text-error" x-text="errMsg"></span>
+          </template>
+        </div>
+      </template>
+    </div>
+  </div>
+</div>
diff --git a/templates/components/widgets/select_widget.html b/templates/components/widgets/select_widget.html
new file mode 100644
index 00000000..0d0a05a1
--- /dev/null
+++ b/templates/components/widgets/select_widget.html
@@ -0,0 +1,68 @@
+{# Select dropdown widget - pure HTML template #}
+<div class="form-control">
+  <div class="flex flex-col gap-2 sm:flex-row sm:items-baseline">
+    <!-- Label -->
+    <label class="label sm:w-48 sm:shrink-0">
+      <span
+        class="label-text"
+        :class="{
+              'text-error': hasError,
+              'text-sm text-base-content/60': isViewMode
+            }"
+        x-text="label"
+      ></span>
+    </label>
+
+    <!-- Input column -->
+    <div class="flex-1">
+      <!-- Help text -->
+      <template x-if="helpText">
+        <div class="label">
+          <span
+            class="label-text-alt text-base-content/60"
+            x-text="helpText"
+          ></span>
+        </div>
+      </template>
+
+      <!-- View mode -->
+      <template x-if="isViewMode">
+        <div class="mt-1">
+          <template x-if="value">
+            <span class="text-base" x-text="value"></span>
+          </template>
+          <template x-if="!value">
+            <span class="text-base-content/50">—</span>
+          </template>
+        </div>
+      </template>
+
+      <!-- Edit mode -->
+      <template x-if="isEditMode">
+        <select
+          class="select select-bordered w-full"
+          :class="{ 'select-error': hasError }"
+          x-model="value"
+        >
+          <option value="" :selected="!value">Select...</option>
+          <template x-for="opt in options" :key="opt">
+            <option
+              :value="opt"
+              :selected="value === opt"
+              x-text="opt"
+            ></option>
+          </template>
+        </select>
+      </template>
+
+      <!-- Errors -->
+      <template x-if="hasError">
+        <div class="label">
+          <template x-for="errMsg in errors" :key="errMsg">
+            <span class="label-text-alt text-error" x-text="errMsg"></span>
+          </template>
+        </div>
+      </template>
+    </div>
+  </div>
+</div>
diff --git a/templates/components/widgets/text_widget.html b/templates/components/widgets/text_widget.html
new file mode 100644
index 00000000..67af9c2e
--- /dev/null
+++ b/templates/components/widgets/text_widget.html
@@ -0,0 +1,60 @@
+{# Text input widget - pure HTML template #}
+<div class="form-control">
+  <div class="flex flex-col gap-2 sm:flex-row sm:items-baseline">
+    <!-- Label -->
+    <label class="label sm:w-48 sm:shrink-0">
+      <span
+        class="label-text"
+        :class="{
+              'text-error': hasError,
+              'text-sm text-base-content/60': isViewMode
+            }"
+        x-text="label"
+      ></span>
+    </label>
+
+    <!-- Input column -->
+    <div class="flex-1">
+      <!-- Help text -->
+      <template x-if="helpText">
+        <div class="label">
+          <span
+            class="label-text-alt text-base-content/60"
+            x-text="helpText"
+          ></span>
+        </div>
+      </template>
+
+      <!-- View mode -->
+      <template x-if="isViewMode">
+        <div class="mt-1">
+          <template x-if="value">
+            <span class="text-base" x-text="value"></span>
+          </template>
+          <template x-if="!value">
+            <span class="text-base-content/50">—</span>
+          </template>
+        </div>
+      </template>
+
+      <!-- Edit mode -->
+      <template x-if="isEditMode">
+        <input
+          type="text"
+          class="input input-bordered w-full"
+          :class="{ 'input-error': hasError }"
+          x-model="value"
+        />
+      </template>
+
+      <!-- Errors -->
+      <template x-if="hasError">
+        <div class="label">
+          <template x-for="errMsg in errors" :key="errMsg">
+            <span class="label-text-alt text-error" x-text="errMsg"></span>
+          </template>
+        </div>
+      </template>
+    </div>
+  </div>
+</div>
diff --git a/templates/components/widgets/textarea_widget.html b/templates/components/widgets/textarea_widget.html
new file mode 100644
index 00000000..3d57e1f1
--- /dev/null
+++ b/templates/components/widgets/textarea_widget.html
@@ -0,0 +1,59 @@
+{# Textarea widget - pure HTML template #}
+<div class="form-control">
+  <div class="flex flex-col gap-2 sm:flex-row sm:items-baseline">
+    <!-- Label -->
+    <label class="label sm:w-48 sm:shrink-0">
+      <span
+        class="label-text"
+        :class="{
+              'text-error': hasError,
+              'text-sm text-base-content/60': isViewMode
+            }"
+        x-text="label"
+      ></span>
+    </label>
+
+    <!-- Input column -->
+    <div class="flex-1">
+      <!-- Help text -->
+      <template x-if="helpText">
+        <div class="label">
+          <span
+            class="label-text-alt text-base-content/60"
+            x-text="helpText"
+          ></span>
+        </div>
+      </template>
+
+      <!-- View mode -->
+      <template x-if="isViewMode">
+        <div class="mt-1">
+          <template x-if="value">
+            <p class="text-base whitespace-pre-wrap" x-text="value"></p>
+          </template>
+          <template x-if="!value">
+            <span class="text-base-content/50">—</span>
+          </template>
+        </div>
+      </template>
+
+      <!-- Edit mode -->
+      <template x-if="isEditMode">
+        <textarea
+          class="textarea textarea-bordered w-full"
+          :class="{ 'textarea-error': hasError }"
+          x-model="value"
+        ></textarea>
+      </template>
+
+      <!-- Errors -->
+      <template x-if="hasError">
+        <div class="label">
+          <template x-for="errMsg in errors" :key="errMsg">
+            <span class="label-text-alt text-error" x-text="errMsg"></span>
+          </template>
+        </div>
+      </template>
+    </div>
+  </div>
+</div>
diff --git a/templates/framework_modern.html b/templates/framework_modern.html
index 00f950f7..1135094c 100644
--- a/templates/framework_modern.html
+++ b/templates/framework_modern.html
@@ -30,6 +30,7 @@
     <script src="{% static 'js/alpine/search.js' %}"></script>
     <script src="{% static 'js/alpine/pagination.js' %}"></script>
     <script src="{% static 'js/alpine/pathway.js' %}"></script>
+    <script src="{% static 'js/alpine/components/schema-form.js' %}"></script>
 
     {# Font Awesome #}
     <link
diff --git a/templates/modals/collections/new_scenario_modal.html b/templates/modals/collections/new_scenario_modal.html
index 0ed4a9c8..b8524ac7 100644
--- a/templates/modals/collections/new_scenario_modal.html
+++ b/templates/modals/collections/new_scenario_modal.html
@@ -4,17 +4,152 @@
   id="new_scenario_modal"
   class="modal"
   x-data="{
-    ...modalForm(),
+    isSubmitting: false,
+    error: null,
     scenarioType: 'empty',
+    schemas: {},
+    groupSchemas: {},
+    loadingSchemas: false,
+    formData: {
+      name: '',
+      description: '',
+      dateYear: '',
+      dateMonth: '',
+      dateDay: '',
+      scenarioType: 'empty',
+      additionalInformation: {}
+    },
+    // Track form data from each schema renderer
+    schemaFormData: {},
+
     validateYear(el) {
       if (el.value && el.value.length < 4) {
         el.value = new Date().getFullYear();
       }
+    },
+
+    async init() {
+      try {
+        this.loadingSchemas = true;
+        // Ensure API client is available
+        if (!window.AdditionalInformationApi) {
+          throw new Error('Additional Information API client not loaded. Please refresh the page.');
+        }
+
+        // Use single API call to load schemas organized by groups
+        const { schemas, groupSchemas } =
+          await window.AdditionalInformationApi.loadSchemasWithGroups(['soil', 'sludge', 'sediment']);
+
+        this.schemas = schemas;
+        this.groupSchemas = groupSchemas;
+      } catch (err) {
+        this.error = err.message;
+        console.error('Error loading schemas:', err);
+      } finally {
+        this.loadingSchemas = false;
+      }
+    },
+
+    reset() {
+      this.isSubmitting = false;
+      this.error = null;
+      this.scenarioType = 'empty';
+      this.formData = {
+        name: '',
+        description: '',
+        dateYear: '',
+        dateMonth: '',
+        dateDay: '',
+        scenarioType: 'empty',
+        additionalInformation: {}
+      };
+      this.schemaFormData = {};
+    },
+
+    setSchemaFormData(schemaName, data) {
+      this.schemaFormData[schemaName] = data;
+    },
+
+    async submit() {
+      if (!this.formData.name || this.formData.name.trim() === '') {
+        this.error = 'Please enter a scenario name';
+        return;
+      }
+
+      this.isSubmitting = true;
+      this.error = null;
+
+      try {
+        // Build scenario date
+        let scenarioDate = this.formData.dateYear || '';
+        if (this.formData.dateMonth && this.formData.dateMonth.trim() !== '') {
+          scenarioDate += `-${parseInt(this.formData.dateMonth).toString().padStart(2, '0')}`;
+          if (this.formData.dateDay && this.formData.dateDay.trim() !== '') {
+            scenarioDate += `-${parseInt(this.formData.dateDay).toString().padStart(2, '0')}`;
+          }
+        }
+
+        if (!scenarioDate || scenarioDate.trim() === '') {
+          scenarioDate = 'No date';
+        }
+
+        // Collect additional information from schema forms
+        const additionalInformation = [];
+        const currentGroupSchemas = this.groupSchemas[this.scenarioType] || {};
+
+        for (const schemaName in this.schemaFormData) {
+          const data = this.schemaFormData[schemaName];
+          // Only include if schema belongs to current group and has data
+          if (currentGroupSchemas[schemaName] && data && Object.keys(data).length > 0) {
+            // Check if data has any non-null/non-empty values
+            const hasData = Object.values(data).some(val => {
+              if (val === null || val === undefined || val === '') return false;
+              if (typeof val === 'object' && val !== null) {
+                // For interval objects, check if start or end has value
+                if (val.start !== null && val.start !== undefined && val.start !== '') return true;
+                if (val.end !== null && val.end !== undefined && val.end !== '') return true;
+                return false;
+              }
+              return true;
+            });
+
+            if (hasData) {
+              additionalInformation.push({
+                type: schemaName,
+                data: data
+              });
+            }
+          }
+        }
+
+        // Build payload
+        const payload = {
+          name: this.formData.name.trim(),
+          description: this.formData.description ? this.formData.description.trim() : '',
+          scenario_date: scenarioDate,
+          scenario_type: this.scenarioType === 'empty' ? 'Not specified' : this.scenarioType,
+          additional_information: additionalInformation
+        };
+
+        const packageUuid = '{{ meta.current_package.uuid }}';
+
+        // Use API client for scenario creation
+        const result = await window.AdditionalInformationApi.createScenario(packageUuid, payload);
+
+        // Close modal and redirect to new scenario
+        document.getElementById('new_scenario_modal').close();
+        window.location.href = result.url || `{{ meta.current_package.url }}/scenario/${result.uuid}`;
+      } catch (err) {
+        this.error = err.message;
+      } finally {
+        this.isSubmitting = false;
+      }
     }
   }"
   @close="reset()"
+  @schema-form-data-changed.window="setSchemaFormData($event.detail.schemaName, $event.detail.data)"
 >
-  <div class="modal-box max-w-3xl">
+  <div class="modal-box max-w-3xl max-h-[90vh] overflow-y-auto">
     <!-- Header -->
     <h3 class="text-lg font-bold">New Scenario</h3>
 
@@ -30,135 +165,212 @@
 
     <!-- Body -->
     <div class="py-4">
-      <form
-        id="new-scenario-modal-form"
-        accept-charset="UTF-8"
-        action="{{ meta.current_package.url }}/scenario"
-        method="post"
-      >
-        {% csrf_token %}
+      <div class="alert alert-info mb-4">
+        <span>
+          Please enter name, description, and date of scenario. Date should be
+          associated to the data, not the current date. For example, this could
+          reflect the publishing date of a study. You can leave all fields but
+          the name empty and fill them in later.
+          <a
+            target="_blank"
+            href="https://wiki.envipath.org/index.php/scenario"
+            class="link"
+            >wiki &gt;&gt;</a
+          >
+        </span>
+      </div>
 
-        <div class="alert alert-info mb-4">
-          <span>
-            Please enter name, description, and date of scenario. Date should be
-            associated to the data, not the current date. For example, this
-            could reflect the publishing date of a study. You can leave all
-            fields but the name empty and fill them in later.
-            <a
-              target="_blank"
-              href="https://wiki.envipath.org/index.php/scenario"
-              class="link"
-              >wiki &gt;&gt;</a
-            >
-          </span>
+      <!-- Error state -->
+      <template x-if="error">
+        <div class="alert alert-error mb-4">
+          <span x-text="error"></span>
         </div>
+      </template>
 
-        <div class="form-control mb-3">
-          <label class="label" for="scenario-name">
-            <span class="label-text">Name</span>
-          </label>
-          <input
-            id="scenario-name"
-            name="scenario-name"
-            class="input input-bordered w-full"
-            placeholder="Name"
-            required
-          />
+      <!-- Loading state -->
+      <template x-if="loadingSchemas">
+        <div class="flex items-center justify-center p-4">
+          <span class="loading loading-spinner loading-md"></span>
         </div>
+      </template>
 
-        <div class="form-control mb-3">
-          <label class="label" for="scenario-description">
-            <span class="label-text">Description</span>
-          </label>
-          <input
-            id="scenario-description"
-            name="scenario-description"
-            class="input input-bordered w-full"
-            placeholder="Description"
-          />
-        </div>
-
-        <div class="form-control mb-3">
-          <label class="label">
-            <span class="label-text">Date</span>
-          </label>
-          <div class="flex gap-2">
+      <!-- Form fields -->
+      <template x-if="!loadingSchemas">
+        <div>
+          <div class="form-control mb-3">
+            <label class="label" for="scenario-name">
+              <span class="label-text">Name</span>
+            </label>
             <input
-              type="number"
-              id="dateYear"
-              name="scenario-date-year"
-              class="input input-bordered w-24"
-              placeholder="YYYY"
-              max="{% now 'Y' %}"
-              @blur="validateYear($el)"
-            />
-            <input
-              type="number"
-              id="dateMonth"
-              name="scenario-date-month"
-              min="1"
-              max="12"
-              class="input input-bordered w-20"
-              placeholder="MM"
-            />
-            <input
-              type="number"
-              id="dateDay"
-              name="scenario-date-day"
-              min="1"
-              max="31"
-              class="input input-bordered w-20"
-              placeholder="DD"
+              id="scenario-name"
+              type="text"
+              class="input input-bordered w-full"
+              placeholder="Name"
+              x-model="formData.name"
+              required
             />
           </div>
-        </div>
 
-        <div class="form-control mb-3">
-          <label class="label">
-            <span class="label-text">Scenario Type</span>
-          </label>
-          <div role="tablist" class="tabs tabs-border">
-            <button
-              type="button"
-              role="tab"
-              class="tab"
-              :class="{ 'tab-active': scenarioType === 'empty' }"
-              @click="scenarioType = 'empty'"
-            >
-              Empty Scenario
-            </button>
-            {% for k, v in scenario_types.items %}
+          <div class="form-control mb-3">
+            <label class="label" for="scenario-description">
+              <span class="label-text">Description</span>
+            </label>
+            <input
+              id="scenario-description"
+              type="text"
+              class="input input-bordered w-full"
+              placeholder="Description"
+              x-model="formData.description"
+            />
+          </div>
+
+          <div class="form-control mb-3">
+            <label class="label">
+              <span class="label-text">Date</span>
+            </label>
+            <div class="flex gap-2">
+              <input
+                type="number"
+                class="input input-bordered w-24"
+                placeholder="YYYY"
+                max="{% now 'Y' %}"
+                x-model="formData.dateYear"
+                @blur="validateYear($el)"
+              />
+              <input
+                type="number"
+                min="1"
+                max="12"
+                class="input input-bordered w-20"
+                placeholder="MM"
+                x-model="formData.dateMonth"
+              />
+              <input
+                type="number"
+                min="1"
+                max="31"
+                class="input input-bordered w-20"
+                placeholder="DD"
+                x-model="formData.dateDay"
+              />
+            </div>
+          </div>
+
+          <div class="form-control mb-3">
+            <label class="label">
+              <span class="label-text">Scenario Type</span>
+            </label>
+            <div role="tablist" class="tabs tabs-border">
               <button
                 type="button"
                 role="tab"
                 class="tab"
-                :class="{ 'tab-active': scenarioType === '{{ v.name }}' }"
-                @click="scenarioType = '{{ v.name }}'"
+                :class="{ 'tab-active': scenarioType === 'empty' }"
+                @click="scenarioType = 'empty'"
               >
-                {{ k }}
+                Empty Scenario
               </button>
-            {% endfor %}
+              <button
+                type="button"
+                role="tab"
+                class="tab"
+                :class="{ 'tab-active': scenarioType === 'soil' }"
+                @click="scenarioType = 'soil'"
+              >
+                Soil Data
+              </button>
+              <button
+                type="button"
+                role="tab"
+                class="tab"
+                :class="{ 'tab-active': scenarioType === 'sludge' }"
+                @click="scenarioType = 'sludge'"
+              >
+                Sludge Data
+              </button>
+              <button
+                type="button"
+                role="tab"
+                class="tab"
+                :class="{ 'tab-active': scenarioType === 'sediment' }"
+                @click="scenarioType = 'sediment'"
+              >
+                Water-Sediment System Data
+              </button>
+            </div>
           </div>
-          <input
-            type="hidden"
-            id="scenario-type"
-            name="scenario-type"
-            x-model="scenarioType"
-          />
-        </div>
 
-        {% for type in scenario_types.values %}
-          <div
-            id="{{ type.name }}-specific-inputs"
-            x-show="scenarioType === '{{ type.name }}'"
-            x-cloak
-          >
-            {% for widget in type.widgets %}
-              {{ widget|safe }}
-            {% endfor %}
-          </div>
-        {% endfor %}
-      </form>
+          <!-- Schema forms for each scenario type -->
+          <template x-if="scenarioType === 'soil'">
+            <div class="space-y-4 mt-4">
+              <template
+                x-for="(rjsf, schemaName) in groupSchemas.soil"
+                :key="schemaName"
+              >
+                <div
+                  x-data="schemaRenderer({
+                    rjsf: rjsf,
+                    mode: 'edit'
+                  })"
+                  x-init="await init();
+                  const currentSchemaName = schemaName;
+                  $watch('data', (value) => {
+                    $dispatch('schema-form-data-changed', { schemaName: currentSchemaName, data: value });
+                  }, { deep: true })"
+                >
+                  {% include "components/schema_form.html" %}
+                </div>
+              </template>
+            </div>
+          </template>
+
+          <template x-if="scenarioType === 'sludge'">
+            <div class="space-y-4 mt-4">
+              <template
+                x-for="(rjsf, schemaName) in groupSchemas.sludge"
+                :key="schemaName"
+              >
+                <div
+                  x-data="schemaRenderer({
+                    rjsf: rjsf,
+                    mode: 'edit'
+                  })"
+                  x-init="await init();
+                  const currentSchemaName = schemaName;
+                  $watch('data', (value) => {
+                    $dispatch('schema-form-data-changed', { schemaName: currentSchemaName, data: value });
+                  }, { deep: true })"
+                >
+                  {% include "components/schema_form.html" %}
+                </div>
+              </template>
+            </div>
+          </template>
+
+          <template x-if="scenarioType === 'sediment'">
+            <div class="space-y-4 mt-4">
+              <template
+                x-for="(rjsf, schemaName) in groupSchemas.sediment"
+                :key="schemaName"
+              >
+                <div
+                  x-data="schemaRenderer({
+                    rjsf: rjsf,
+                    mode: 'edit'
+                  })"
+                  x-init="await init();
+                  const currentSchemaName = schemaName;
+                  $watch('data', (value) => {
+                    $dispatch('schema-form-data-changed', { schemaName: currentSchemaName, data: value });
+                  }, { deep: true })"
+                >
+                  {% include "components/schema_form.html" %}
+                </div>
+              </template>
+            </div>
+          </template>
+        </div>
+      </template>
     </div>
 
     <!-- Footer -->
@@ -174,8 +386,8 @@
       <button
         type="button"
         class="btn btn-primary"
-        @click="submit('new-scenario-modal-form')"
-        :disabled="isSubmitting"
+        @click="submit()"
+        :disabled="isSubmitting || loadingSchemas"
       >
         <span x-show="!isSubmitting">Submit</span>
         <span
diff --git a/templates/modals/objects/add_additional_information_modal.html b/templates/modals/objects/add_additional_information_modal.html
index a99b041c..831a6aa2 100644
--- a/templates/modals/objects/add_additional_information_modal.html
+++ b/templates/modals/objects/add_additional_information_modal.html
@@ -6,27 +6,110 @@
   x-data="{
     isSubmitting: false,
     selectedType: '',
+    schemas: {},
+    loadingSchemas: false,
+    error: null,
+    formData: null,  // Store reference to form data
+    formRenderKey: 0,  // Counter to force form re-render
+    existingTypes: [],  // Track existing additional information types
+
+    // Get sorted unique schema names for dropdown, excluding already-added types
+    get sortedSchemaNames() {
+      const names = Object.keys(this.schemas);
+      // Remove duplicates, exclude existing types, and sort alphabetically by display title
+      const unique = [...new Set(names)];
+      const available = unique.filter(name => !this.existingTypes.includes(name));
+      return available.sort((a, b) => {
+        const titleA = (this.schemas[a]?.schema?.['x-title'] || a).toLowerCase();
+        const titleB = (this.schemas[b]?.schema?.['x-title'] || b).toLowerCase();
+        return titleA.localeCompare(titleB);
+      });
+    },
+
+    async init() {
+      // Watch for selectedType changes
+      this.$watch('selectedType', (value) => {
+        // Reset formData when type changes and increment key to force re-render
+        this.formData = null;
+        this.formRenderKey++;
+      });
+
+      // Load schemas and existing items
+      try {
+        this.loadingSchemas = true;
+        const scenarioUuid = '{{ scenario.uuid }}';
+        const [schemasRes, itemsRes] = await Promise.all([
+          fetch('/api/v1/information/schema/'),
+          fetch(`/api/v1/scenario/${scenarioUuid}/information/`)
+        ]);
+
+        if (!schemasRes.ok) throw new Error('Failed to load schemas');
+        if (!itemsRes.ok) throw new Error('Failed to load existing items');
+
+        this.schemas = await schemasRes.json();
+        const items = await itemsRes.json();
+
+        // Get unique existing types (normalize to lowercase)
+        this.existingTypes = [...new Set(items.map(item => item.type.toLowerCase()))];
+      } catch (err) {
+        this.error = err.message;
+      } finally {
+        this.loadingSchemas = false;
+      }
+    },
 
     reset() {
       this.isSubmitting = false;
       this.selectedType = '';
+      this.error = null;
+      this.formData = null;
     },
 
-    submit() {
+    setFormData(data) {
+      this.formData = data;
+    },
+
+    async submit() {
       if (!this.selectedType) return;
 
-      const form = document.getElementById('add_' + this.selectedType + '_add-additional-information-modal-form');
-      if (form && form.checkValidity()) {
-        this.isSubmitting = true;
-        form.submit();
-      } else if (form) {
-        form.reportValidity();
+      const payload = window.AdditionalInformationApi.sanitizePayload(this.formData);
+
+      // Validate that form has data
+      if (!payload || Object.keys(payload).length === 0) {
+        this.error = 'Please fill in at least one field';
+        return;
+      }
+
+      this.isSubmitting = true;
+      this.error = null;
+
+      try {
+        const scenarioUuid = '{{ scenario.uuid }}';
+        await window.AdditionalInformationApi.createItem(
+          scenarioUuid,
+          this.selectedType,
+          payload
+        );
+
+        // Close modal and reload page to show new item
+        document.getElementById('add_additional_information_modal').close();
+        window.location.reload();
+      } catch (err) {
+        if (err.isValidationError && err.fieldErrors) {
+          window.dispatchEvent(new CustomEvent('set-field-errors', {
+            detail: err.fieldErrors
+          }));
+        }
+        this.error = err.message;
+      } finally {
+        this.isSubmitting = false;
       }
     }
   }"
   @close="reset()"
+  @form-data-ready="formData = $event.detail"
 >
-  <div class="modal-box">
+  <div class="modal-box max-w-2xl">
     <!-- Header -->
     <h3 class="text-lg font-bold">Add Additional Information</h3>
 
@@ -42,46 +125,59 @@
 
     <!-- Body -->
     <div class="py-4">
-      <div class="form-control">
-        <label class="label" for="select-additional-information-type">
-          <span class="label-text">Select the type to add</span>
-        </label>
-        <select
-          id="select-additional-information-type"
-          class="select select-bordered w-full"
-          x-model="selectedType"
-        >
-          <option value="" selected disabled>Select the type to add</option>
-          {% for add_inf in available_additional_information %}
-            <option value="{{ add_inf.name }}">
-              {{ add_inf.display_name }}
-            </option>
-          {% endfor %}
-        </select>
-      </div>
-
-      {% for add_inf in available_additional_information %}
-        <div
-          class="mt-4"
-          x-show="selectedType === '{{ add_inf.name }}'"
-          x-cloak
-        >
-          <form
-            id="add_{{ add_inf.name }}_add-additional-information-modal-form"
-            accept-charset="UTF-8"
-            action=""
-            method="post"
-          >
-            {% csrf_token %}
-            {{ add_inf.widget|safe }}
-            <input
-              type="hidden"
-              name="hidden"
-              value="add-additional-information"
-            />
-          </form>
+      <!-- Loading state -->
+      <template x-if="loadingSchemas">
+        <div class="flex items-center justify-center p-4">
+          <span class="loading loading-spinner loading-md"></span>
         </div>
-      {% endfor %}
+      </template>
+
+      <!-- Error state -->
+      <template x-if="error">
+        <div class="alert alert-error mb-4">
+          <span x-text="error"></span>
+        </div>
+      </template>
+
+      <!-- Schema selection -->
+      <template x-if="!loadingSchemas">
+        <div>
+          <div class="form-control mb-4">
+            <label class="label" for="select-additional-information-type">
+              <span class="label-text">Select the type to add</span>
+            </label>
+            <select
+              id="select-additional-information-type"
+              class="select select-bordered w-full"
+              x-model="selectedType"
+            >
+              <option value="" selected disabled>Select the type to add</option>
+              <template x-for="name in sortedSchemaNames" :key="name">
+                <option
+                  :value="name"
+                  x-text="(schemas[name].schema && schemas[name].schema['x-title']) || name"
+                ></option>
+              </template>
+            </select>
+          </div>
+
+          <!-- Form renderer for selected type -->
+          <!-- Use unique key per type to force re-render -->
+          <template x-for="renderKey in [formRenderKey]" :key="renderKey">
+            <div x-show="selectedType && schemas[selectedType]">
+              <div
+                x-data="schemaRenderer({
+                  rjsf: schemas[selectedType],
+                  mode: 'edit'
+                })"
+                x-init="await init(); $dispatch('form-data-ready', data)"
+              >
+                {% include "components/schema_form.html" %}
+              </div>
+            </div>
+          </template>
+        </div>
+      </template>
     </div>
 
     <!-- Footer -->
@@ -98,7 +194,7 @@
         type="button"
         class="btn btn-primary"
         @click="submit()"
-        :disabled="isSubmitting || !selectedType"
+        :disabled="isSubmitting || !selectedType || loadingSchemas"
       >
         <span x-show="!isSubmitting">Add</span>
         <span
diff --git a/templates/modals/objects/update_scenario_additional_information_modal.html b/templates/modals/objects/update_scenario_additional_information_modal.html
index 0431ea2a..8758fbeb 100644
--- a/templates/modals/objects/update_scenario_additional_information_modal.html
+++ b/templates/modals/objects/update_scenario_additional_information_modal.html
@@ -3,10 +3,99 @@
 <dialog
   id="update_scenario_additional_information_modal"
   class="modal"
-  x-data="modalForm()"
+  x-data="{
+    isSubmitting: false,
+    items: [],
+    schemas: {},
+    loading: false,
+    error: null,
+    originalItems: [],  // Store original data to detect changes
+    modifiedUuids: new Set(),  // Track which items were modified
+
+    async init() {
+      try {
+        this.loading = true;
+        const scenarioUuid = '{{ scenario.uuid }}';
+        const { items, schemas } =
+          await window.AdditionalInformationApi.loadSchemasAndItems(scenarioUuid);
+        this.items = items;
+        this.schemas = schemas;
+        // Store deep copy of original items for comparison
+        this.originalItems = JSON.parse(JSON.stringify(items));
+      } catch (err) {
+        this.error = err.message;
+      } finally {
+        this.loading = false;
+      }
+    },
+
+    reset() {
+      this.isSubmitting = false;
+      this.error = null;
+      this.modifiedUuids.clear();
+    },
+
+    updateItemData(uuid, data) {
+      // Update the item's data in the items array
+      const item = this.items.find(i => i.uuid === uuid);
+      if (item) {
+        item.data = data;
+        // Mark this item as modified
+        this.modifiedUuids.add(uuid);
+      }
+    },
+
+    async submit() {
+      if (this.items.length === 0) {
+        this.error = 'No data to update';
+        return;
+      }
+
+      // Filter to only items that were actually modified
+      const modifiedItems = this.items.filter(item => this.modifiedUuids.has(item.uuid));
+
+      if (modifiedItems.length === 0) {
+        this.error = 'No changes to save';
+        return;
+      }
+
+      this.isSubmitting = true;
+      this.error = null;
+
+      try {
+        const scenarioUuid = '{{ scenario.uuid }}';
+
+        // Use the unified API client for sequential, safe updates - only modified items
+        await window.AdditionalInformationApi.updateItems(scenarioUuid, modifiedItems);
+
+        // Close modal and reload page
+        document.getElementById('update_scenario_additional_information_modal').close();
+        window.location.reload();
+      } catch (err) {
+        // Handle validation errors with field-level details
+        if (err.isValidationError && err.fieldErrors) {
+          this.error = err.message;
+          // Dispatch event to set field errors in the specific form
+          if (err.itemUuid) {
+            window.dispatchEvent(new CustomEvent('set-field-errors-for-item', {
+              detail: {
+                uuid: err.itemUuid,
+                fieldErrors: err.fieldErrors
+              }
+            }));
+          }
+        } else {
+          this.error = err.message;
+        }
+      } finally {
+        this.isSubmitting = false;
+      }
+    }
+  }"
   @close="reset()"
+  @update-item-data.window="updateItemData($event.detail.uuid, $event.detail.data)"
 >
-  <div class="modal-box">
+  <div class="modal-box max-h-[90vh] max-w-4xl overflow-y-auto">
     <!-- Header -->
     <h3 class="text-lg font-bold">Update Additional Information</h3>
 
@@ -22,18 +111,39 @@
 
     <!-- Body -->
     <div class="py-4">
-      <form
-        id="edit-scenario-additional-information-modal-form"
-        accept-charset="UTF-8"
-        action=""
-        method="post"
-      >
-        {% csrf_token %}
-        {% for widget in update_widgets %}
-          {{ widget|safe }}
-        {% endfor %}
-        <input type="hidden" name="hidden" value="set-additional-information" />
-      </form>
+      <!-- Loading state -->
+      {% include "components/modals/loading_state.html" with loading_var="loading" %}
+
+      <!-- Error state -->
+      {% include "components/modals/error_state.html" with error_var="error" %}
+
+      <!-- Items list -->
+      <template x-if="!loading">
+        <div class="space-y-4">
+          <template x-if="items.length === 0">
+            <p class="text-base-content/60">
+              No additional information to update.
+            </p>
+          </template>
+
+          <template x-for="(item, index) in items" :key="item.uuid">
+            <div class="card bg-base-200 shadow-sm">
+              <div class="card-body p-4">
+                <div
+                  x-data="schemaRenderer({
+                    rjsf: schemas[item.type.toLowerCase()],
+                    data: item.data,
+                    mode: 'edit'
+                  })"
+                  x-init="await init(); $watch('data', (value) => { $dispatch('update-item-data', { uuid: item.uuid, data: value }) }, { deep: true })"
+                >
+                  {% include "components/schema_form.html" %}
+                </div>
+              </div>
+            </div>
+          </template>
+        </div>
+      </template>
     </div>
 
     <!-- Footer -->
@@ -49,10 +159,17 @@
       <button
         type="button"
         class="btn btn-primary"
-        @click="submit('edit-scenario-additional-information-modal-form')"
-        :disabled="isSubmitting"
+        @click="submit()"
+        :disabled="isSubmitting || loading || items.length === 0 || modifiedUuids.size === 0"
       >
-        <span x-show="!isSubmitting">Update</span>
+        <span x-show="!isSubmitting">
+          <template x-if="modifiedUuids.size > 0">
+            <span x-text="`Update (${modifiedUuids.size})`"></span>
+          </template>
+          <template x-if="modifiedUuids.size === 0">
+            <span>No Changes</span>
+          </template>
+        </span>
         <span
           x-show="isSubmitting"
           class="loading loading-spinner loading-sm"
diff --git a/templates/objects/scenario.html b/templates/objects/scenario.html
index c34ab886..5b227380 100644
--- a/templates/objects/scenario.html
+++ b/templates/objects/scenario.html
@@ -1,6 +1,9 @@
 {% extends "framework_modern.html" %}
+{% load static %}
 
 {% block content %}
+  <script src="{% static 'js/alpine/components/widgets.js' %}"></script>
+  <script src="{% static 'js/api/additional-information.js' %}"></script>
 
   {% block action_modals %}
     {% include "modals/objects/edit_scenario_modal.html" %}
@@ -58,46 +61,88 @@
       </div>
     </div>
 
-    <!-- Additional Information Table -->
+    <!-- Additional Information -->
     <div class="card bg-base-100">
       <div class="card-body">
         <h3 class="card-title mb-4 text-lg">Additional Information</h3>
-        <div class="overflow-x-auto">
-          <table class="table-zebra table">
-            <thead>
-              <tr>
-                <th>Property</th>
-                <th>Value</th>
-                <th>Unit</th>
-                {% if meta.can_edit %}
-                  <th>Remove</th>
-                {% endif %}
-              </tr>
-            </thead>
-            <tbody>
-              {% for ai in scenario.get_additional_information %}
-                <tr>
-                  <td>{{ ai.property_name|safe }}</td>
-                  <td>{{ ai.property_data|safe }}</td>
-                  <td>{{ ai.property_unit|safe }}</td>
-                  {% if meta.can_edit %}
-                    <td>
-                      <form
-                        action="{% url 'package scenario detail' scenario.package.uuid scenario.uuid %}"
-                        method="post"
+        <div
+          x-data="{
+            items: [],
+            schemas: {},
+            loading: true,
+            error: null,
+            async init() {
+              try {
+                // Use the unified API client for loading data
+                const { items, schemas } = await window.AdditionalInformationApi.loadSchemasAndItems('{{ scenario.uuid }}');
+                this.items = items;
+                this.schemas = schemas;
+              } catch (err) {
+                this.error = err.message;
+                console.error('Error loading additional information:', err);
+              } finally {
+                this.loading = false;
+              }
+            },
+            async deleteItem(uuid) {
+              if (!confirm('Are you sure you want to delete this item?')) return;
+
+              try {
+                // Use the unified API client for delete operations
+                await window.AdditionalInformationApi.deleteItem('{{ scenario.uuid }}', uuid);
+
+                // Remove from items array
+                this.items = this.items.filter(item => item.uuid !== uuid);
+              } catch (err) {
+                alert('Error deleting item: ' + err.message);
+                console.error('Error deleting item:', err);
+              }
+            }
+          }"
+        >
+          <!-- Loading state -->
+          <template x-if="loading">
+            <div class="flex items-center justify-center p-4">
+              <span class="loading loading-spinner loading-md"></span>
+            </div>
+          </template>
+
+          <!-- Error state -->
+          <template x-if="error">
+            <div class="alert alert-error mb-4">
+              <span x-text="error"></span>
+            </div>
+          </template>
+
+          <!-- Items list -->
+          <template x-if="!loading && !error">
+            <div class="space-y-4">
+              <template x-if="items.length === 0">
+                <p class="text-base-content/60">
+                  No additional information available.
+                </p>
+              </template>
+
+              <template x-for="item in items" :key="item.uuid">
+                <div class="card bg-base-200 shadow-sm">
+                  <div class="card-body p-4">
+                    <div class="flex items-start justify-between">
+                      <div
+                        class="flex-1"
+                        x-data="schemaRenderer({
+                             rjsf: schemas[item.type.toLowerCase()],
+                             data: item.data,
+                             mode: 'view'
+                           })"
+                        x-init="init()"
                       >
-                        {% csrf_token %}
-                        <input
-                          type="hidden"
-                          name="uuid"
-                          value="{{ ai.uuid }}"
-                        />
-                        <input
-                          type="hidden"
-                          name="hidden"
-                          value="delete-additional-information"
-                        />
-                        <button type="submit" class="btn btn-sm btn-ghost">
+                        {% include "components/schema_form.html" %}
+                      </div>
+                      {% if meta.can_edit %}
+                        <button
+                          class="btn btn-sm btn-ghost ml-2"
+                          @click="deleteItem(item.uuid)"
+                        >
                           <svg
                             xmlns="http://www.w3.org/2000/svg"
                             width="16"
@@ -108,56 +153,20 @@
                             stroke-width="2"
                             stroke-linecap="round"
                             stroke-linejoin="round"
-                            class="lucide lucide-minus"
+                            class="lucide lucide-trash"
                           >
-                            <path d="M5 12h14" />
+                            <path d="M3 6h18" />
+                            <path d="M19 6v14c0 1-1 2-2 2H7c-1 0-2-1-2-2V6" />
+                            <path d="M8 6V4c0-1 1-2 2-2h4c1 0 2 1 2 2v2" />
                           </svg>
                         </button>
-                      </form>
-                    </td>
-                  {% endif %}
-                </tr>
-              {% endfor %}
-              {% if meta.can_edit %}
-                <tr>
-                  <td></td>
-                  <td></td>
-                  <td>Delete all</td>
-                  <td>
-                    <form
-                      action="{% url 'package scenario detail' scenario.package.uuid scenario.uuid %}"
-                      method="post"
-                    >
-                      {% csrf_token %}
-                      <input
-                        type="hidden"
-                        name="hidden"
-                        value="delete-all-additional-information"
-                      />
-                      <button type="submit" class="btn btn-sm btn-ghost">
-                        <svg
-                          xmlns="http://www.w3.org/2000/svg"
-                          width="16"
-                          height="16"
-                          viewBox="0 0 24 24"
-                          fill="none"
-                          stroke="currentColor"
-                          stroke-width="2"
-                          stroke-linecap="round"
-                          stroke-linejoin="round"
-                          class="lucide lucide-trash"
-                        >
-                          <path d="M3 6h18" />
-                          <path d="M19 6v14c0 1-1 2-2 2H7c-1 0-2-1-2-2V6" />
-                          <path d="M8 6V4c0-1 1-2 2-2h4c1 0 2 1 2 2v2" />
-                        </svg>
-                      </button>
-                    </form>
-                  </td>
-                </tr>
-              {% endif %}
-            </tbody>
-          </table>
+                      {% endif %}
+                    </div>
+                  </div>
+                </div>
+              </template>
+            </div>
+          </template>
         </div>
       </div>
     </div>
diff --git a/utilities/misc.py b/utilities/misc.py
index fddf61dd..6aa3098c 100644
--- a/utilities/misc.py
+++ b/utilities/misc.py
@@ -1,20 +1,15 @@
 import base64
 import hashlib
 import hmac
-import html
 import json
 import logging
 import uuid
 from collections import defaultdict
 from datetime import datetime
-from enum import Enum
-from types import NoneType
 from typing import Any, Dict, List, TYPE_CHECKING
 
 from django.conf import settings as s
 from django.db import transaction
-from envipy_additional_information import NAME_MAPPING, EnviPyModel, Interval
-from pydantic import BaseModel, HttpUrl
 
 from epdb.models import (
     Compound,
@@ -49,183 +44,6 @@ if TYPE_CHECKING:
     from epdb.logic import SPathway
 
 
-class HTMLGenerator:
-    registry = {x.__name__: x for x in NAME_MAPPING.values()}
-
-    @staticmethod
-    def generate_html(additional_information: "EnviPyModel", prefix="") -> str:
-        from typing import Union, get_args, get_origin
-
-        if isinstance(additional_information, type):
-            clz_name = additional_information.__name__
-        else:
-            clz_name = additional_information.__class__.__name__
-
-        widget = f'<h4 class="h4 font-semibold mt-2 mb-1">{clz_name}</h4>'
-
-        if hasattr(additional_information, "uuid"):
-            uuid = additional_information.uuid
-            widget += f'<input type="hidden" name="{clz_name}__{prefix}__uuid" value="{uuid}">'
-
-        for name, field in additional_information.model_fields.items():
-            value = getattr(additional_information, name, None)
-            full_name = f"{clz_name}__{prefix}__{name}"
-            annotation = field.annotation
-            base_type = get_origin(annotation) or annotation
-
-            # Optional[Interval[float]] alias for Union[X, None]
-            if base_type is Union:
-                for arg in get_args(annotation):
-                    if arg is not NoneType:
-                        field_type = arg
-                        break
-            else:
-                field_type = base_type
-
-            is_interval_float = (
-                field_type == Interval[float]
-                or str(field_type) == str(Interval[float])
-                or "Interval[float]" in str(field_type)
-            )
-
-            if is_interval_float:
-                label_text_start = " ".join([x.capitalize() for x in name.split("_")]) + " Start"
-                label_text_end = " ".join([x.capitalize() for x in name.split("_")]) + " End"
-                widget += f"""
-                    <div class="grid grid-cols-2 gap-4 mb-4">
-                        <div class="form-control">
-                            <label class="label" for="{full_name}__start">
-                                <span class="label-text">{label_text_start}</span>
-                            </label>
-                            <input type="number" class="input input-bordered w-full" id="{full_name}__start" name="{full_name}__start" value="{value.start if value else ""}">
-                        </div>
-                        <div class="form-control">
-                            <label class="label" for="{full_name}__end">
-                                <span class="label-text">{label_text_end}</span>
-                            </label>
-                            <input type="number" class="input input-bordered w-full" id="{full_name}__end" name="{full_name}__end" value="{value.end if value else ""}">
-                        </div>
-                    </div>
-                """
-            elif issubclass(field_type, Enum):
-                options: str = ""
-                for e in field_type:
-                    options += f'<option value="{e.value}" {"selected" if e == value else ""}>{html.escape(e.name)}</option>'
-
-                label_text = " ".join([x.capitalize() for x in name.split("_")])
-                widget += f"""
-                <div class="form-control mb-4">
-                    <label class="label" for="{full_name}">
-                        <span class="label-text">{label_text}</span>
-                    </label>
-                    <select class="select select-bordered w-full" id="{full_name}" name="{full_name}">
-                        <option value="" disabled selected>Select {label_text}</option>
-                        {options}
-                    </select>
-                </div>
-                """
-            else:
-                if field_type is str or field_type is HttpUrl:
-                    input_type = "text"
-                elif field_type is float or field_type is int:
-                    input_type = "number"
-                elif field_type is bool:
-                    input_type = "checkbox"
-                else:
-                    raise ValueError(f"Could not parse field type {field_type} for {name}")
-
-                value_to_use = value if value and field_type is not bool else ""
-                label_text = " ".join([x.capitalize() for x in name.split("_")])
-
-                if field_type is bool:
-                    widget += f"""
-                    <div class="form-control mb-4">
-                        <label class="label cursor-pointer">
-                            <span class="label-text">{label_text}</span>
-                            <input type="checkbox" class="checkbox" id="{full_name}" name="{full_name}" {"checked" if value else ""}>
-                        </label>
-                    </div>
-                    """
-                else:
-                    widget += f"""
-                    <div class="form-control mb-4">
-                        <label class="label" for="{full_name}">
-                            <span class="label-text">{label_text}</span>
-                        </label>
-                        <input type="{input_type}" class="input input-bordered w-full" id="{full_name}" name="{full_name}" value="{value_to_use}">
-                    </div>
-                    """
-
-        return widget
-
-    @staticmethod
-    def build_models(params) -> Dict[str, List["EnviPyModel"]]:
-        def has_non_none(d):
-            """
-            Recursively checks if any value in a (possibly nested) dict is not None.
-            """
-            for value in d.values():
-                if isinstance(value, dict):
-                    if has_non_none(value):  # recursive check
-                        return True
-                elif value is not None:
-                    return True
-            return False
-
-        """
-        Build Pydantic model instances from flattened HTML parameters.
-
-        Args:
-            params: dict of {param_name: value}, e.g. form data
-            model_registry: mapping of class names (strings) to Pydantic model classes
-
-        Returns:
-            dict: {ClassName: [list of model instances]}
-        """
-        grouped: Dict[str, Dict[str, Dict[str, Any]]] = {}
-
-        # Step 1: group fields by ClassName and Number
-        for key, value in params.items():
-            if value == "":
-                value = None
-
-            parts = key.split("__")
-            if len(parts) < 3:
-                continue  # skip invalid keys
-
-            class_name, number, *field_parts = parts
-            grouped.setdefault(class_name, {}).setdefault(number, {})
-
-            # handle nested fields like interval__start
-            target = grouped[class_name][number]
-            current = target
-            for p in field_parts[:-1]:
-                current = current.setdefault(p, {})
-            current[field_parts[-1]] = value
-
-        # Step 2: instantiate Pydantic models
-        instances: Dict[str, List[BaseModel]] = defaultdict(list)
-        for class_name, number_dict in grouped.items():
-            model_cls = HTMLGenerator.registry.get(class_name)
-
-            if not model_cls:
-                logger.info(f"Could not find model class for {class_name}")
-                continue
-
-            for number, fields in number_dict.items():
-                if not has_non_none(fields):
-                    print(f"Skipping empty {class_name} {number} {fields}")
-                    continue
-
-                uuid = fields.pop("uuid", None)
-                instance = model_cls(**fields)
-                if uuid:
-                    instance.__dict__["uuid"] = uuid
-                instances[class_name].append(instance)
-
-        return instances
-
-
 class PackageExporter:
     def __init__(
         self,
diff --git a/uv.lock b/uv.lock
index 094d26ea..c3769173 100644
--- a/uv.lock
+++ b/uv.lock
@@ -670,6 +670,7 @@ dependencies = [
     { name = "envipy-plugins" },
     { name = "epam-indigo" },
     { name = "gunicorn" },
+    { name = "jsonref" },
     { name = "networkx" },
     { name = "nh3" },
     { name = "polars" },
@@ -711,11 +712,12 @@ requires-dist = [
     { name = "django-polymorphic", specifier = ">=4.1.0" },
     { name = "django-stubs", marker = "extra == 'dev'", specifier = ">=5.2.4" },
     { name = "enviformer", git = "ssh://git@git.envipath.com/enviPath/enviformer.git?rev=v0.1.4" },
-    { name = "envipy-additional-information", git = "ssh://git@git.envipath.com/enviPath/enviPy-additional-information.git?rev=v0.1.7" },
+    { name = "envipy-additional-information", git = "ssh://git@git.envipath.com/enviPath/enviPy-additional-information.git?rev=v0.2.0" },
     { name = "envipy-ambit", git = "ssh://git@git.envipath.com/enviPath/enviPy-ambit.git" },
     { name = "envipy-plugins", git = "ssh://git@git.envipath.com/enviPath/enviPy-plugins.git?rev=v0.1.0" },
     { name = "epam-indigo", specifier = ">=1.30.1" },
     { name = "gunicorn", specifier = ">=23.0.0" },
+    { name = "jsonref", specifier = ">=1.1.0" },
     { name = "msal", marker = "extra == 'ms-login'", specifier = ">=1.33.0" },
     { name = "networkx", specifier = ">=3.4.2" },
     { name = "nh3", specifier = "==0.3.2" },
@@ -739,8 +741,8 @@ provides-extras = ["ms-login", "dev"]
 
 [[package]]
 name = "envipy-additional-information"
-version = "0.1.7"
-source = { git = "ssh://git@git.envipath.com/enviPath/enviPy-additional-information.git?rev=v0.1.7#d02a5d5e6a931e6565ea86127813acf7e4b33a30" }
+version = "0.2.0"
+source = { git = "ssh://git@git.envipath.com/enviPath/enviPy-additional-information.git?rev=v0.2.0#02e3ae64b2ff42a5d2b723a76727c8f6755c9a90" }
 dependencies = [
     { name = "pydantic" },
 ]
@@ -1015,6 +1017,15 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/72/68/84050ed2679e2d2ee2030a60d3e5a59a29d0533cd03fd8d9891e36592b0f/jpype1-1.6.0-cp313-cp313t-manylinux2014_x86_64.manylinux_2_17_x86_64.whl", hash = "sha256:1a3814e4f65d67e36bdb03b8851d5ece8d7a408aa3a24251ea0609bb8fba77dd", size = 497229, upload-time = "2025-07-07T13:50:57.842Z" },
 ]
 
+[[package]]
+name = "jsonref"
+version = "1.1.0"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/aa/0d/c1f3277e90ccdb50d33ed5ba1ec5b3f0a242ed8c1b1a85d3afeb68464dca/jsonref-1.1.0.tar.gz", hash = "sha256:32fe8e1d85af0fdefbebce950af85590b22b60f9e95443176adbde4e1ecea552", size = 8814, upload-time = "2023-01-16T16:10:04.455Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/0c/ec/e1db9922bceb168197a558a2b8c03a7963f1afe93517ddd3cf99f202f996/jsonref-1.1.0-py3-none-any.whl", hash = "sha256:590dc7773df6c21cbf948b5dac07a72a251db28b0238ceecce0a2abfa8ec30a9", size = 9425, upload-time = "2023-01-16T16:10:02.255Z" },
+]
+
 [[package]]
 name = "jwcrypto"
 version = "1.5.6"