diff --git a/epapi/tests/utils/__init__.py b/epapi/tests/utils/__init__.py
new file mode 100644
index 00000000..c3b59707
--- /dev/null
+++ b/epapi/tests/utils/__init__.py
@@ -0,0 +1 @@
+"""Tests for epapi utility modules."""
diff --git a/epapi/tests/utils/test_validation_errors.py b/epapi/tests/utils/test_validation_errors.py
new file mode 100644
index 00000000..c2a98be6
--- /dev/null
+++ b/epapi/tests/utils/test_validation_errors.py
@@ -0,0 +1,222 @@
+"""
+Tests for validation error utilities.
+
+Tests the format_validation_error() and handle_validation_error() functions
+that transform Pydantic validation errors into user-friendly messages.
+"""
+
+from django.test import TestCase, tag
+import json
+from pydantic import BaseModel, ValidationError, field_validator
+from typing import Literal
+
+from ninja.errors import HttpError
+from epapi.utils.validation_errors import format_validation_error, handle_validation_error
+
+
+@tag("api", "utils")
+class ValidationErrorUtilityTests(TestCase):
+    """Test validation error utility functions."""
+
+    def test_format_missing_field_error(self):
+        """Test formatting of missing required field error."""
+
+        # Create a model with required field
+        class TestModel(BaseModel):
+            required_field: str
+
+        # Trigger validation error
+        try:
+            TestModel()
+        except ValidationError as e:
+            errors = e.errors()
+            self.assertEqual(len(errors), 1)
+            formatted = format_validation_error(errors[0])
+            self.assertEqual(formatted, "This field is required")
+
+    def test_format_enum_error(self):
+        """Test formatting of enum validation error."""
+
+        class TestModel(BaseModel):
+            status: Literal["active", "inactive"]
+
+        try:
+            TestModel(status="invalid")
+        except ValidationError as e:
+            errors = e.errors()
+            self.assertEqual(len(errors), 1)
+            formatted = format_validation_error(errors[0])
+            # Literal errors get formatted as "Please enter ..." with the valid options
+            self.assertIn("Please enter", formatted)
+            self.assertIn("active", formatted)
+            self.assertIn("inactive", formatted)
+
+    def test_format_string_type_error(self):
+        """Test formatting of string type validation error."""
+
+        class TestModel(BaseModel):
+            name: str
+
+        try:
+            TestModel(name=123)
+        except ValidationError as e:
+            errors = e.errors()
+            self.assertEqual(len(errors), 1)
+            formatted = format_validation_error(errors[0])
+            self.assertEqual(formatted, "Please enter a valid string")
+
+    def test_format_int_type_error(self):
+        """Test formatting of integer type validation error."""
+
+        class TestModel(BaseModel):
+            count: int
+
+        try:
+            TestModel(count="not_a_number")
+        except ValidationError as e:
+            errors = e.errors()
+            self.assertEqual(len(errors), 1)
+            formatted = format_validation_error(errors[0])
+            self.assertEqual(formatted, "Please enter a valid int")
+
+    def test_format_float_type_error(self):
+        """Test formatting of float type validation error."""
+
+        class TestModel(BaseModel):
+            value: float
+
+        try:
+            TestModel(value="not_a_float")
+        except ValidationError as e:
+            errors = e.errors()
+            self.assertEqual(len(errors), 1)
+            formatted = format_validation_error(errors[0])
+            self.assertEqual(formatted, "Please enter a valid float")
+
+    def test_format_value_error(self):
+        """Test formatting of value error from custom validator."""
+
+        class TestModel(BaseModel):
+            age: int
+
+            @field_validator("age")
+            @classmethod
+            def validate_age(cls, v):
+                if v < 0:
+                    raise ValueError("Age must be positive")
+                return v
+
+        try:
+            TestModel(age=-5)
+        except ValidationError as e:
+            errors = e.errors()
+            self.assertEqual(len(errors), 1)
+            formatted = format_validation_error(errors[0])
+            self.assertEqual(formatted, "Age must be positive")
+
+    def test_handle_validation_error_structure(self):
+        """Test that handle_validation_error raises HttpError with correct structure."""
+
+        class TestModel(BaseModel):
+            name: str
+            count: int
+
+        try:
+            TestModel(name=123, count="invalid")
+        except ValidationError as e:
+            # handle_validation_error should raise HttpError
+            with self.assertRaises(HttpError) as context:
+                handle_validation_error(e)
+
+            http_error = context.exception
+            self.assertEqual(http_error.status_code, 400)
+
+            # Parse the JSON from the error message
+            error_data = json.loads(http_error.message)
+
+            # Check structure
+            self.assertEqual(error_data["type"], "validation_error")
+            self.assertIn("field_errors", error_data)
+            self.assertIn("message", error_data)
+            self.assertEqual(error_data["message"], "Please correct the errors below")
+
+            # Check that both fields have errors
+            self.assertIn("name", error_data["field_errors"])
+            self.assertIn("count", error_data["field_errors"])
+
+    def test_handle_validation_error_no_pydantic_internals(self):
+        """Test that handle_validation_error doesn't expose Pydantic internals."""
+
+        class TestModel(BaseModel):
+            email: str
+
+        try:
+            TestModel(email=123)
+        except ValidationError as e:
+            with self.assertRaises(HttpError) as context:
+                handle_validation_error(e)
+
+            http_error = context.exception
+            error_data = json.loads(http_error.message)
+            error_str = json.dumps(error_data)
+
+            # Ensure no Pydantic internals are exposed
+            self.assertNotIn("pydantic", error_str.lower())
+            self.assertNotIn("https://errors.pydantic.dev", error_str)
+            self.assertNotIn("loc", error_str)
+
+    def test_handle_validation_error_user_friendly_messages(self):
+        """Test that all error messages are user-friendly."""
+
+        class TestModel(BaseModel):
+            name: str
+            age: int
+            status: Literal["active", "inactive"]
+
+        try:
+            TestModel(name=123, status="invalid")  # Multiple errors
+        except ValidationError as e:
+            with self.assertRaises(HttpError) as context:
+                handle_validation_error(e)
+
+            http_error = context.exception
+            error_data = json.loads(http_error.message)
+
+            # All messages should be user-friendly (contain "Please" or "This field")
+            for field, messages in error_data["field_errors"].items():
+                for message in messages:
+                    # User-friendly messages start with "Please" or "This field"
+                    self.assertTrue(
+                        message.startswith("Please") or message.startswith("This field"),
+                        f"Message '{message}' is not user-friendly",
+                    )
+
+    def test_handle_validation_error_multiple_errors_same_field(self):
+        """Test handling multiple validation errors for the same field."""
+
+        class TestModel(BaseModel):
+            value: int
+
+            @field_validator("value")
+            @classmethod
+            def validate_range(cls, v):
+                if v < 0:
+                    raise ValueError("Must be non-negative")
+                if v > 100:
+                    raise ValueError("Must be at most 100")
+                return v
+
+        # Test with string (type error) - this will fail before the validator runs
+        try:
+            TestModel(value="invalid")
+        except ValidationError as e:
+            with self.assertRaises(HttpError) as context:
+                handle_validation_error(e)
+
+            http_error = context.exception
+            error_data = json.loads(http_error.message)
+
+            # Should have error for 'value' field
+            self.assertIn("value", error_data["field_errors"])
+            self.assertIsInstance(error_data["field_errors"]["value"], list)
+            self.assertGreater(len(error_data["field_errors"]["value"]), 0)
diff --git a/epapi/tests/v1/test_additional_information.py b/epapi/tests/v1/test_additional_information.py
index d8c19b25..3439b52e 100644
--- a/epapi/tests/v1/test_additional_information.py
+++ b/epapi/tests/v1/test_additional_information.py
@@ -252,6 +252,51 @@ class AdditionalInformationAPITests(TestCase):
 
         self.assertEqual(patch_response.status_code, 400)
 
+    def test_patch_validation_errors_are_user_friendly(self):
+        """Test that PATCH validation errors are user-friendly and field-specific."""
+        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"]
+
+        # Update with invalid data - wrong type (string instead of number in interval)
+        invalid_payload = {"interval": {"start": "not_a_number", "end": 25}}
+        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)
+        data = patch_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_delete_additional_information(self):
         """Test DELETE removes additional information."""
         self.client.force_login(self.user)
diff --git a/epapi/utils/schema_transformers.py b/epapi/utils/schema_transformers.py
index 6ff18bdf..0d3c074d 100644
--- a/epapi/utils/schema_transformers.py
+++ b/epapi/utils/schema_transformers.py
@@ -85,6 +85,10 @@ def extract_ui_config_from_model(model_cls: Type[BaseModel]) -> dict[str, Any]:
 
     # Extract config for each field
     for field_name in field_names:
+        # Skip if UI config doesn't exist for this field (field may be hidden from UI)
+        if not hasattr(ui_class, field_name):
+            continue
+
         ui_config = getattr(ui_class, field_name)
 
         if isinstance(ui_config, UIConfig):
@@ -139,7 +143,9 @@ def build_schema(model_cls: Type[BaseModel]) -> dict[str, Any]:
             schema[f"x-{key}"] = value
 
     # Set standard title property from UI metadata for JSON Schema compliance
-    if "label" in ui_metadata:
+    if "title" in ui_metadata:
+        schema["title"] = ui_metadata["title"]
+    elif "label" in ui_metadata:
         schema["title"] = ui_metadata["label"]
 
     return schema
diff --git a/epapi/utils/validation_errors.py b/epapi/utils/validation_errors.py
new file mode 100644
index 00000000..933e59b7
--- /dev/null
+++ b/epapi/utils/validation_errors.py
@@ -0,0 +1,82 @@
+"""Shared utilities for handling Pydantic validation errors."""
+
+import json
+from pydantic import ValidationError
+from pydantic_core import ErrorDetails
+from ninja.errors import HttpError
+
+
+def format_validation_error(error: ErrorDetails) -> str:
+    """Format a Pydantic validation error into a user-friendly message.
+
+    Args:
+        error: A Pydantic error details dictionary containing 'msg', 'type', 'ctx', etc.
+
+    Returns:
+        A user-friendly error message string.
+    """
+    msg = error.get("msg") or "Invalid value"
+    error_type = error.get("type") or ""
+
+    # Handle common validation types with friendly messages
+    if error_type == "enum":
+        ctx = error.get("ctx", {})
+        expected = ctx.get("expected", "") if ctx else ""
+        return f"Please select a valid option{': ' + expected if expected else ''}"
+    elif error_type == "literal_error":
+        # Literal errors (like Literal["active", "inactive"])
+        return msg.replace("Input should be ", "Please enter ")
+    elif error_type == "missing":
+        return "This field is required"
+    elif error_type == "string_type":
+        return "Please enter a valid string"
+    elif error_type == "int_type":
+        return "Please enter a valid int"
+    elif error_type == "int_parsing":
+        return "Please enter a valid int"
+    elif error_type == "float_type":
+        return "Please enter a valid float"
+    elif error_type == "float_parsing":
+        return "Please enter a valid float"
+    elif error_type == "value_error":
+        # Strip "Value error, " prefix from custom validator messages
+        return msg.replace("Value error, ", "")
+    else:
+        # Default: use the message from Pydantic but clean it up
+        return msg.replace("Input should be ", "Please enter ").replace("Value error, ", "")
+
+
+def handle_validation_error(e: ValidationError) -> None:
+    """Convert a Pydantic ValidationError into a structured HttpError.
+
+    This function transforms Pydantic validation errors into a JSON structure
+    that the frontend expects for displaying field-level errors.
+
+    Args:
+        e: The Pydantic ValidationError to handle.
+
+    Raises:
+        HttpError: Always raises a 400 error with structured JSON containing
+                   type, field_errors, and message fields.
+    """
+    # 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))
diff --git a/epapi/v1/endpoints/additional_information.py b/epapi/v1/endpoints/additional_information.py
index 5fbaf190..44365f3f 100644
--- a/epapi/v1/endpoints/additional_information.py
+++ b/epapi/v1/endpoints/additional_information.py
@@ -2,14 +2,13 @@ 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 epapi.utils.validation_errors import handle_validation_error
 from ..dal import get_scenario_for_read, get_scenario_for_write
 
 logger = logging.getLogger(__name__)
@@ -56,28 +55,6 @@ def list_scenario_info(request, scenario_uuid: UUID):
     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(...)
@@ -90,27 +67,7 @@ def add_scenario_info(
     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))
+        handle_validation_error(e)
 
     scenario = get_scenario_for_write(request.user, scenario_uuid)
 
@@ -147,27 +104,7 @@ def update_scenario_info(
     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))
+        handle_validation_error(e)
 
     # Use model method for update
     try:
diff --git a/static/js/alpine/components/schema-form.js b/static/js/alpine/components/schema-form.js
index 1f6bd937..223981a7 100644
--- a/static/js/alpine/components/schema-form.js
+++ b/static/js/alpine/components/schema-form.js
@@ -12,33 +12,84 @@
  *     endpoint: '/api/v1/scenario/{uuid}/information/temperature/'
  * })">
  */
-document.addEventListener('alpine:init', () => {
-  Alpine.data('schemaRenderer', (options = {}) => ({
+document.addEventListener("alpine:init", () => {
+  // Global validation error store with context scoping
+  Alpine.store('validationErrors', {
+    errors: {},
+
+    // Set errors for a specific context (UUID) or globally (no context)
+    setErrors(errors, context = null) {
+      if (context) {
+        // Namespace all field names with context prefix
+        const namespacedErrors = {};
+        Object.entries(errors).forEach(([field, messages]) => {
+          const key = `${context}.${field}`;
+          namespacedErrors[key] = messages;
+        });
+        // Merge into existing errors (preserves other contexts)
+        this.errors = { ...this.errors, ...namespacedErrors };
+      } else {
+        // No context - merge as-is for backward compatibility
+        this.errors = { ...this.errors, ...errors };
+      }
+    },
+
+    // Clear errors for a specific context or all errors
+    clearErrors(context = null) {
+      if (context) {
+        // Clear only errors for this context
+        const newErrors = {};
+        const prefix = `${context}.`;
+        Object.keys(this.errors).forEach(key => {
+          if (!key.startsWith(prefix)) {
+            newErrors[key] = this.errors[key];
+          }
+        });
+        this.errors = newErrors;
+      } else {
+        // Clear all errors
+        this.errors = {};
+      }
+    },
+
+    // Clear a specific field, optionally within a context
+    clearField(fieldName, context = null) {
+      const key = context ? `${context}.${fieldName}` : fieldName;
+      if (this.errors[key]) {
+        delete this.errors[key];
+        // Trigger reactivity by creating new object
+        this.errors = { ...this.errors };
+      }
+    },
+
+    // Check if a field has errors, optionally within a context
+    hasError(fieldName, context = null) {
+      const key = context ? `${context}.${fieldName}` : fieldName;
+      return Array.isArray(this.errors[key]) && this.errors[key].length > 0;
+    },
+
+    // Get errors for a field, optionally within a context
+    getErrors(fieldName, context = null) {
+      const key = context ? `${context}.${fieldName}` : fieldName;
+      return this.errors[key] || [];
+    }
+  });
+
+  Alpine.data("schemaRenderer", (options = {}) => ({
     schema: null,
     uiSchema: {},
     data: {},
-    mode: options.mode || 'view', // 'view' | 'edit'
-    endpoint: options.endpoint || '',
+    mode: options.mode || "view", // 'view' | 'edit'
+    endpoint: options.endpoint || "",
     loading: false,
     error: null,
-    fieldErrors: {}, // Server-side field-level errors
+    context: options.context || null, // UUID for items, null for single forms
+    debugErrors:
+      options.debugErrors ??
+      (typeof window !== "undefined" &&
+        window.location?.search?.includes("debugErrors=1")),
 
     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;
@@ -50,31 +101,31 @@ document.addEventListener('alpine:init', () => {
 
           // RJSF format: {schema, uiSchema, formData, groups}
           if (!rjsf.schema) {
-            throw new Error('Invalid RJSF format: missing schema property');
+            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 || {});
+            : rjsf.formData || {};
         } catch (err) {
           this.error = err.message;
-          console.error('Error loading schema:', err);
+          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');
+          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 || {});
+          : options.rjsf.formData || {};
       }
 
       // Initialize data from formData or options
@@ -84,19 +135,22 @@ document.addEventListener('alpine:init', () => {
 
       // Ensure all schema fields are properly initialized
       if (this.schema && this.schema.properties) {
-        for (const [key, propSchema] of Object.entries(this.schema.properties)) {
+        for (const [key, propSchema] of Object.entries(
+          this.schema.properties,
+        )) {
           const widget = this.getWidget(key, propSchema);
 
-          if (widget === 'interval') {
+          if (widget === "interval") {
             // Ensure interval fields are objects with start/end
-            if (!this.data[key] || typeof this.data[key] !== 'object') {
+            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].start === undefined)
+                this.data[key].start = null;
               if (this.data[key].end === undefined) this.data[key].end = null;
             }
-          } else if (widget === 'timeseries-table') {
+          } else if (widget === "timeseries-table") {
             // Ensure timeseries fields are arrays
             if (!this.data[key] || !Array.isArray(this.data[key])) {
               this.data[key] = [];
@@ -104,86 +158,141 @@ document.addEventListener('alpine:init', () => {
           } 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') {
+            if (propSchema.type === "boolean") {
               this.data[key] = false;
-            } else if (propSchema.type === 'number' || propSchema.type === 'integer') {
+            } 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] = '';
+              this.data[key] = "";
             }
           }
           // If data[key] exists (even if empty string or null), don't overwrite
         }
       }
+
+      // UX: Clear field errors when fields change (with context)
+      if (this.mode === "edit" && this.schema?.properties) {
+        Object.keys(this.schema.properties).forEach((key) => {
+          this.$watch(
+            `data.${key}`,
+            () => {
+              Alpine.store('validationErrors').clearField(key, this.context);
+            },
+            { deep: true },
+          );
+        });
+      }
     },
 
     getWidget(fieldName, fieldSchema) {
-      // Check uiSchema first (RJSF format)
-      if (this.uiSchema[fieldName] && this.uiSchema[fieldName]['ui:widget']) {
-        return this.uiSchema[fieldName]['ui:widget'];
-      }
+      // Defensive check: ensure fieldSchema is provided
+      if (!fieldSchema) return "text";
 
-      // Check for interval type (object with start/end properties)
-      if (fieldSchema.type === 'object' &&
+      try {
+        // Check uiSchema first (RJSF format)
+        if (
+          this.uiSchema &&
+          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';
-      }
+          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';
+        // Check for measurements array type (timeseries-table widget)
+        if (
+          fieldSchema.type === "array" &&
+          fieldSchema.items?.properties?.timestamp &&
+          fieldSchema.items?.properties?.value
+        ) {
+          return "timeseries-table";
+        }
+
+        // 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";
+      } catch (e) {
+        // Fallback to text widget if anything fails
+        console.warn("Error in getWidget:", e);
+        return "text";
+      }
     },
 
     getLabel(fieldName, fieldSchema) {
       // Check uiSchema (RJSF format)
-      if (this.uiSchema[fieldName] && this.uiSchema[fieldName]['ui:label']) {
-        return this.uiSchema[fieldName]['ui:label'];
+      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;
+      return fieldName
+        .replace(/_/g, " ")
+        .replace(/\b\w/g, (c) => c.toUpperCase());
     },
 
     getFieldOrder() {
-      // Get ordered list of field names based on ui:order
-      if (!this.schema || !this.schema.properties) return [];
+      try {
+        // Get ordered list of field names based on ui:order
+        if (!this.schema || !this.schema.properties) return [];
 
-      const fields = Object.keys(this.schema.properties);
+        // Only include fields that have UI configs
+        const fields = Object.keys(this.schema.properties).filter(
+          (fieldName) => this.uiSchema && this.uiSchema[fieldName],
+        );
 
-      // 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);
-      });
+        // 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);
+        });
+      } catch (e) {
+        // Return empty array if anything fails to prevent errors
+        console.warn("Error in getFieldOrder:", e);
+        return [];
+      }
+    },
+
+    hasTimeseriesField() {
+      try {
+        // Check if any field in the schema is a timeseries-table widget
+        if (!this.schema || !this.schema.properties) {
+          return false;
+        }
+
+        return Object.keys(this.schema.properties).some((fieldName) => {
+          const fieldSchema = this.schema.properties[fieldName];
+          if (!fieldSchema) return false;
+          return this.getWidget(fieldName, fieldSchema) === "timeseries-table";
+        });
+      } catch (e) {
+        // Return false if anything fails to prevent errors
+        console.warn("Error in hasTimeseriesField:", e);
+        return false;
+      }
     },
 
     async submit() {
       if (!this.endpoint) {
-        console.error('No endpoint specified for submission');
+        console.error("No endpoint specified for submission");
         return;
       }
 
@@ -191,14 +300,15 @@ document.addEventListener('alpine:init', () => {
       this.error = null;
 
       try {
-        const csrftoken = document.querySelector("[name=csrf-token]")?.content || '';
+        const csrftoken =
+          document.querySelector("[name=csrf-token]")?.content || "";
         const res = await fetch(this.endpoint, {
-          method: 'POST',
+          method: "POST",
           headers: {
-            'Content-Type': 'application/json',
-            'X-CSRFToken': csrftoken
+            "Content-Type": "application/json",
+            "X-CSRFToken": csrftoken,
           },
-          body: JSON.stringify(this.data)
+          body: JSON.stringify(this.data),
         });
 
         if (!res.ok) {
@@ -210,35 +320,50 @@ document.addEventListener('alpine:init', () => {
           }
 
           // Handle validation errors (field-level)
-          this.fieldErrors = {};
+          Alpine.store('validationErrors').clearErrors();
 
           // 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('{')) {
+          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: '...'}]
+            const fieldErrors = {};
             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] = [];
+              const field =
+                err.loc && err.loc.length > 0
+                  ? err.loc[err.loc.length - 1]
+                  : "root";
+              if (!fieldErrors[field]) {
+                fieldErrors[field] = [];
               }
-              this.fieldErrors[field].push(err.msg || err.message || 'Validation error');
+              fieldErrors[field].push(
+                err.msg || err.message || "Validation error",
+              );
             }
-            throw new Error('Validation failed. Please check the fields below.');
+            Alpine.store('validationErrors').setErrors(fieldErrors);
+            throw new Error(
+              "Validation failed. Please check the fields below.",
+            );
           } else {
             // General error
-            throw new Error(parsedError.error || parsedError.detail || `Request failed: ${res.statusText}`);
+            throw new Error(
+              parsedError.error ||
+                parsedError.detail ||
+                `Request failed: ${res.statusText}`,
+            );
           }
         }
 
         // Clear errors on success
-        this.fieldErrors = {};
+        Alpine.store('validationErrors').clearErrors();
 
         const result = await res.json();
         return result;
@@ -248,6 +373,6 @@ document.addEventListener('alpine:init', () => {
       } finally {
         this.loading = false;
       }
-    }
+    },
   }));
 });
diff --git a/static/js/alpine/components/widgets.js b/static/js/alpine/components/widgets.js
index 35ac6cb8..e4df0cc1 100644
--- a/static/js/alpine/components/widgets.js
+++ b/static/js/alpine/components/widgets.js
@@ -4,15 +4,24 @@
  * Centralized widget component definitions for dynamic form rendering.
  * Each widget receives explicit parameters instead of context object for better traceability.
  */
-document.addEventListener('alpine:init', () => {
+document.addEventListener("alpine:init", () => {
   // Base widget factory with common functionality
-  const baseWidget = (fieldName, data, schema, uiSchema, fieldErrors, mode) => ({
+  const baseWidget = (
     fieldName,
     data,
     schema,
     uiSchema,
-    fieldErrors,
     mode,
+    debugErrors,
+    context = null  // NEW: context for error namespacing
+  ) => ({
+    fieldName,
+    data,
+    schema,
+    uiSchema,
+    mode,
+    debugErrors,
+    context,  // Store context for use in templates
 
     // Field schema access
     get fieldSchema() {
@@ -22,165 +31,432 @@ document.addEventListener('alpine:init', () => {
     // Common metadata
     get label() {
       // Check uiSchema first (RJSF format)
-      if (this.uiSchema?.[this.fieldName]?.['ui:label']) {
-        return this.uiSchema[this.fieldName]['ui:label'];
+      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());
+      return this.fieldName
+        .replace(/_/g, " ")
+        .replace(/\b\w/g, (c) => c.toUpperCase());
     },
     get helpText() {
-      return this.fieldSchema.description || '';
+      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] || [];
+      return this.uiSchema?.[this.fieldName]?.["ui:unit"] || null;
     },
 
     // Mode checks
-    get isViewMode() { return this.mode === 'view'; },
-    get isEditMode() { return this.mode === 'edit'; },
+    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),
+  Alpine.data(
+    "textWidget",
+    (fieldName, data, schema, uiSchema, mode, debugErrors, context = null) => ({
+      ...baseWidget(
+        fieldName,
+        data,
+        schema,
+        uiSchema,
+        mode,
+        debugErrors,
+        context,
+      ),
 
-    get value() { return this.data[this.fieldName] || ''; },
-    set value(v) { this.data[this.fieldName] = v; },
-  }));
+      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),
+  Alpine.data(
+    "textareaWidget",
+    (fieldName, data, schema, uiSchema, mode, debugErrors, context = null) => ({
+      ...baseWidget(
+        fieldName,
+        data,
+        schema,
+        uiSchema,
+        mode,
+        debugErrors,
+        context,
+      ),
 
-    get value() { return this.data[this.fieldName] || ''; },
-    set value(v) { this.data[this.fieldName] = v; },
-  }));
+      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),
+  Alpine.data(
+    "numberWidget",
+    (fieldName, data, schema, uiSchema, mode, debugErrors, context = null) => ({
+      ...baseWidget(
+        fieldName,
+        data,
+        schema,
+        uiSchema,
+        mode,
+        debugErrors,
+        context,
+      ),
 
-    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} ${this.unit}` : String(this.value);
-    },
-  }));
+      get value() {
+        return this.data[this.fieldName];
+      },
+      set value(v) {
+        this.data[this.fieldName] =
+          v === "" || v === null ? null : parseFloat(v);
+      },
+      get hasValue() {
+        return (
+          this.value !== null && this.value !== undefined && this.value !== ""
+        );
+      },
+      // Format value with unit for view mode
+      get displayValue() {
+        if (!this.hasValue) return "—";
+        return this.unit ? `${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),
+  Alpine.data(
+    "selectWidget",
+    (fieldName, data, schema, uiSchema, mode, debugErrors, context = null) => ({
+      ...baseWidget(
+        fieldName,
+        data,
+        schema,
+        uiSchema,
+        mode,
+        debugErrors,
+        context,
+      ),
 
-    get value() { return this.data[this.fieldName] || ''; },
-    set value(v) { this.data[this.fieldName] = v; },
-    get options() { return this.fieldSchema.enum || []; },
-  }));
+      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),
+  Alpine.data(
+    "checkboxWidget",
+    (fieldName, data, schema, uiSchema, mode, debugErrors, context = null) => ({
+      ...baseWidget(
+        fieldName,
+        data,
+        schema,
+        uiSchema,
+        mode,
+        debugErrors,
+        context,
+      ),
 
-    get checked() { return !!this.data[this.fieldName]; },
-    set checked(v) { this.data[this.fieldName] = v; },
-  }));
+      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),
+  Alpine.data(
+    "intervalWidget",
+    (fieldName, data, schema, uiSchema, mode, debugErrors, context = null) => ({
+      ...baseWidget(
+        fieldName,
+        data,
+        schema,
+        uiSchema,
+        mode,
+        debugErrors,
+        context,
+      ),
 
-    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}` : '';
+      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 '—';
-    },
+        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;
-    },
+      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];
-    },
-  }));
+      // Validation: start must be <= end (client-side)
+      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;
+      },
+    }),
+  );
 
   // PubMed link widget
-  Alpine.data('pubmedWidget', (fieldName, data, schema, uiSchema, fieldErrors, mode) => ({
-    ...baseWidget(fieldName, data, schema, uiSchema, fieldErrors, mode),
+  Alpine.data(
+    "pubmedWidget",
+    (fieldName, data, schema, uiSchema, mode, debugErrors, context = null) => ({
+      ...baseWidget(
+        fieldName,
+        data,
+        schema,
+        uiSchema,
+        mode,
+        debugErrors,
+        context,
+      ),
 
-    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/${this.value}` : null;
-    },
-  }));
+      get value() {
+        return this.data[this.fieldName] || "";
+      },
+      set value(v) {
+        this.data[this.fieldName] = v;
+      },
+      get pubmedUrl() {
+        return this.value
+          ? `https://pubmed.ncbi.nlm.nih.gov/${this.value}`
+          : null;
+      },
+    }),
+  );
 
   // Compound link widget
-  Alpine.data('compoundWidget', (fieldName, data, schema, uiSchema, fieldErrors, mode) => ({
-    ...baseWidget(fieldName, data, schema, uiSchema, fieldErrors, mode),
+  Alpine.data(
+    "compoundWidget",
+    (fieldName, data, schema, uiSchema, mode, debugErrors, context = null) => ({
+      ...baseWidget(
+        fieldName,
+        data,
+        schema,
+        uiSchema,
+        mode,
+        debugErrors,
+        context,
+      ),
 
-    get value() { return this.data[this.fieldName] || ''; },
-    set value(v) { this.data[this.fieldName] = v; },
-  }));
+      get value() {
+        return this.data[this.fieldName] || "";
+      },
+      set value(v) {
+        this.data[this.fieldName] = v;
+      },
+    }),
+  );
+
+  // TimeSeries table widget
+  Alpine.data(
+    "timeseriesTableWidget",
+    (fieldName, data, schema, uiSchema, mode, debugErrors, context = null) => ({
+      ...baseWidget(
+        fieldName,
+        data,
+        schema,
+        uiSchema,
+        mode,
+        debugErrors,
+        context,
+      ),
+
+      chartInstance: null,
+
+      // Getter/setter for measurements array
+      get measurements() {
+        return this.data[this.fieldName] || [];
+      },
+      set measurements(v) {
+        this.data[this.fieldName] = v;
+      },
+
+      // Get description from sibling field
+      get description() {
+        return this.data?.description || "";
+      },
+
+      // Get method from sibling field
+      get method() {
+        return this.data?.method || "";
+      },
+
+      // Computed property for chart options
+      get chartOptions() {
+        return {
+          measurements: this.measurements,
+          xAxisLabel: this.data?.x_axis_label || "Time",
+          yAxisLabel: this.data?.y_axis_label || "Value",
+          xAxisUnit: this.data?.x_axis_unit || "",
+          yAxisUnit: this.data?.y_axis_unit || "",
+        };
+      },
+
+      // Add new measurement
+      addMeasurement() {
+        if (!this.data[this.fieldName]) {
+          this.data[this.fieldName] = [];
+        }
+        this.data[this.fieldName].push({
+          timestamp: null,
+          value: null,
+          error: null,
+          note: "",
+        });
+      },
+
+      // Remove measurement by index
+      removeMeasurement(index) {
+        if (
+          this.data[this.fieldName] &&
+          Array.isArray(this.data[this.fieldName])
+        ) {
+          this.data[this.fieldName].splice(index, 1);
+        }
+      },
+
+      // Update specific measurement field
+      updateMeasurement(index, field, value) {
+        if (this.data[this.fieldName] && this.data[this.fieldName][index]) {
+          if (field === "timestamp" || field === "value" || field === "error") {
+            // Parse all numeric fields (timestamp is days as float)
+            this.data[this.fieldName][index][field] =
+              value === "" || value === null ? null : parseFloat(value);
+          } else {
+            // Store other fields as-is
+            this.data[this.fieldName][index][field] = value;
+          }
+        }
+      },
+
+      // Format timestamp for display (timestamp is numeric days as float)
+      formatTimestamp(timestamp) {
+        return timestamp ?? "";
+      },
+
+      // Sort by timestamp (numeric days)
+      sortByTimestamp() {
+        if (
+          this.data[this.fieldName] &&
+          Array.isArray(this.data[this.fieldName])
+        ) {
+          this.data[this.fieldName].sort((a, b) => {
+            const tsA = a.timestamp ?? Infinity;
+            const tsB = b.timestamp ?? Infinity;
+            return tsA - tsB;
+          });
+        }
+      },
+
+      // Chart lifecycle methods (delegates to TimeSeriesChart utility)
+      initChart() {
+        if (!this.isViewMode || !window.Chart || !window.TimeSeriesChart)
+          return;
+
+        const canvas = this.$refs?.chartCanvas;
+        if (!canvas) return;
+
+        this.destroyChart();
+
+        if (this.measurements.length === 0) return;
+
+        this.chartInstance = window.TimeSeriesChart.create(
+          canvas,
+          this.chartOptions,
+        );
+      },
+
+      updateChart() {
+        if (!this.chartInstance || !this.isViewMode) return;
+        window.TimeSeriesChart.update(
+          this.chartInstance,
+          this.measurements,
+          this.chartOptions,
+        );
+      },
+
+      destroyChart() {
+        if (this.chartInstance) {
+          window.TimeSeriesChart.destroy(this.chartInstance);
+          this.chartInstance = null;
+        }
+      },
+
+      // Alpine lifecycle hooks
+      init() {
+        if (this.isViewMode && window.Chart) {
+          // Use $nextTick to ensure DOM is ready
+          this.$nextTick(() => {
+            this.initChart();
+          });
+
+          // Watch measurements array for changes and update chart
+          this.$watch("data." + this.fieldName, () => {
+            if (this.chartInstance) {
+              this.updateChart();
+            }
+          });
+        }
+      },
+    }),
+  );
 });
diff --git a/static/js/api/additional-information.js b/static/js/api/additional-information.js
index 827d1995..616a3cc6 100644
--- a/static/js/api/additional-information.js
+++ b/static/js/api/additional-information.js
@@ -32,14 +32,14 @@ window.AdditionalInformationApi = {
   sanitizePayload(value) {
     if (Array.isArray(value)) {
       return value
-        .map(item => this.sanitizePayload(item))
-        .filter(item => item !== '');
+        .map((item) => this.sanitizePayload(item))
+        .filter((item) => item !== "");
     }
 
-    if (value && typeof value === 'object') {
+    if (value && typeof value === "object") {
       const cleaned = {};
       for (const [key, item] of Object.entries(value)) {
-        if (item === '') continue;
+        if (item === "") continue;
         cleaned[key] = this.sanitizePayload(item);
       }
       return cleaned;
@@ -53,7 +53,7 @@ window.AdditionalInformationApi = {
    * @returns {string} CSRF token
    */
   getCsrfToken() {
-    return document.querySelector('[name=csrf-token]')?.content || '';
+    return document.querySelector("[name=csrf-token]")?.content || "";
   },
 
   /**
@@ -62,10 +62,10 @@ window.AdditionalInformationApi = {
    */
   _buildHeaders(includeContentType = true) {
     const headers = {
-      'X-CSRFToken': this.getCsrfToken()
+      "X-CSRFToken": this.getCsrfToken(),
     };
     if (includeContentType) {
-      headers['Content-Type'] = 'application/json';
+      headers["Content-Type"] = "application/json";
     }
     return headers;
   },
@@ -85,26 +85,34 @@ window.AdditionalInformationApi = {
 
       // Try to parse the error if it's a JSON string
       let parsedError = errorData;
-      if (typeof errorData.error === 'string' && errorData.error.startsWith('{')) {
+      const errorStr = errorData.detail || errorData.error;
+      if (typeof errorStr === "string" && errorStr.startsWith("{")) {
         try {
-          parsedError = JSON.parse(errorData.error);
+          parsedError = JSON.parse(errorStr);
         } 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) {
+      if (parsedError.type === "validation_error" && parsedError.field_errors) {
         this._log(`${action} VALIDATION ERROR`, parsedError);
-        const error = new Error(parsedError.message || 'Validation failed');
+        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 });
+      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);
     }
 
@@ -118,9 +126,9 @@ window.AdditionalInformationApi = {
    * @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');
+    this._log("loadSchemas", "Starting...");
+    const response = await fetch("/api/v1/information/schema/");
+    return this._handleResponse(response, "loadSchemas");
   },
 
   /**
@@ -129,9 +137,11 @@ window.AdditionalInformationApi = {
    * @returns {Promise<Array>} Array of additional information items
    */
   async loadItems(scenarioUuid) {
-    this._log('loadItems', { scenarioUuid });
-    const response = await fetch(`/api/v1/scenario/${scenarioUuid}/information/`);
-    return this._handleResponse(response, 'loadItems');
+    this._log("loadItems", { scenarioUuid });
+    const response = await fetch(
+      `/api/v1/scenario/${scenarioUuid}/information/`,
+    );
+    return this._handleResponse(response, "loadItems");
   },
 
   /**
@@ -140,11 +150,11 @@ window.AdditionalInformationApi = {
    * @returns {Promise<{schemas: Object, items: Array}>}
    */
   async loadSchemasAndItems(scenarioUuid) {
-    this._log('loadSchemasAndItems', { scenarioUuid });
+    this._log("loadSchemasAndItems", { scenarioUuid });
 
     const [schemas, items] = await Promise.all([
       this.loadSchemas(),
-      this.loadItems(scenarioUuid)
+      this.loadItems(scenarioUuid),
     ]);
 
     return { schemas, items };
@@ -159,7 +169,7 @@ window.AdditionalInformationApi = {
    */
   async createItem(scenarioUuid, modelName, data) {
     const sanitizedData = this.sanitizePayload(data);
-    this._log('createItem', { scenarioUuid, modelName, data: sanitizedData });
+    this._log("createItem", { scenarioUuid, modelName, data: sanitizedData });
 
     // Normalize model name to lowercase
     const normalizedName = modelName.toLowerCase();
@@ -167,13 +177,13 @@ window.AdditionalInformationApi = {
     const response = await fetch(
       `/api/v1/scenario/${scenarioUuid}/information/${normalizedName}/`,
       {
-        method: 'POST',
+        method: "POST",
         headers: this._buildHeaders(),
-        body: JSON.stringify(sanitizedData)
-      }
+        body: JSON.stringify(sanitizedData),
+      },
     );
 
-    return this._handleResponse(response, 'createItem');
+    return this._handleResponse(response, "createItem");
   },
 
   /**
@@ -183,17 +193,17 @@ window.AdditionalInformationApi = {
    * @returns {Promise<{status: string}>}
    */
   async deleteItem(scenarioUuid, itemUuid) {
-    this._log('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)
-      }
+        method: "DELETE",
+        headers: this._buildHeaders(false),
+      },
     );
 
-    return this._handleResponse(response, 'deleteItem');
+    return this._handleResponse(response, "deleteItem");
   },
 
   /**
@@ -205,7 +215,10 @@ window.AdditionalInformationApi = {
    */
   async updateItem(scenarioUuid, item) {
     const sanitizedData = this.sanitizePayload(item.data);
-    this._log('updateItem', { scenarioUuid, item: { ...item, data: sanitizedData } });
+    this._log("updateItem", {
+      scenarioUuid,
+      item: { ...item, data: sanitizedData },
+    });
 
     const { uuid, type } = item;
 
@@ -213,20 +226,23 @@ window.AdditionalInformationApi = {
     const response = await fetch(
       `/api/v1/scenario/${scenarioUuid}/information/item/${uuid}/`,
       {
-        method: 'PATCH',
+        method: "PATCH",
         headers: this._buildHeaders(),
-        body: JSON.stringify(sanitizedData)
-      }
+        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');
+      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');
+    return this._handleResponse(response, "updateItem");
   },
 
   /**
@@ -236,38 +252,50 @@ window.AdditionalInformationApi = {
    * @returns {Promise<Array>} Array of results with success status
    */
   async updateItems(scenarioUuid, items) {
-    this._log('updateItems', { scenarioUuid, itemCount: items.length });
+    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 });
+        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
+          isValidationError: error.isValidationError,
         });
       }
     }
 
-    const failed = results.filter(r => !r.success);
+    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;
+      // If all failures are validation errors, return all validation errors for display
+      const validationErrors = failed.filter((f) => f.isValidationError);
+      if (validationErrors.length === failed.length) {
+        // All failures are validation errors - return all field errors by item UUID
+        const allFieldErrors = {};
+        validationErrors.forEach((ve) => {
+          allFieldErrors[ve.oldUuid] = ve.fieldErrors || {};
+        });
+        const error = new Error(
+          `${failed.length} item(s) have validation errors. Please correct them.`,
+        );
+        error.fieldErrors = allFieldErrors; // Map of UUID -> field errors
         error.isValidationError = true;
-        error.itemUuid = failed[0].oldUuid;
+        error.isMultipleErrors = true; // Flag indicating multiple items have errors
         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.`);
+      throw new Error(
+        `Failed to update ${failed.length} item(s). Please check the form for errors.`,
+      );
     }
 
     return results;
@@ -285,16 +313,13 @@ window.AdditionalInformationApi = {
    * @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/${packageUuid}/scenario/`,
-      {
-        method: 'POST',
-        headers: this._buildHeaders(),
-        body: JSON.stringify(payload)
-      }
-    );
-    return this._handleResponse(response, 'createScenario');
+    this._log("createScenario", { packageUuid, payload });
+    const response = await fetch(`/api/v1/package/${packageUuid}/scenario/`, {
+      method: "POST",
+      headers: this._buildHeaders(),
+      body: JSON.stringify(payload),
+    });
+    return this._handleResponse(response, "createScenario");
   },
 
   /**
@@ -302,9 +327,9 @@ window.AdditionalInformationApi = {
    * @returns {Promise<{groups: string[]}>}
    */
   async loadGroups() {
-    this._log('loadGroups', 'Starting...');
-    const response = await fetch('/api/v1/information/groups/');
-    return this._handleResponse(response, 'loadGroups');
+    this._log("loadGroups", "Starting...");
+    const response = await fetch("/api/v1/information/groups/");
+    return this._handleResponse(response, "loadGroups");
   },
 
   /**
@@ -313,7 +338,7 @@ window.AdditionalInformationApi = {
    * @returns {Promise<Object>} Object with subcategories as keys and arrays of model info
    */
   async loadGroupModels(groupName) {
-    this._log('loadGroupModels', { groupName });
+    this._log("loadGroupModels", { groupName });
     const response = await fetch(`/api/v1/information/groups/${groupName}/`);
     return this._handleResponse(response, `loadGroupModels-${groupName}`);
   },
@@ -323,8 +348,8 @@ window.AdditionalInformationApi = {
    * @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 });
+  async loadGroupsWithModels(groupNames = ["soil", "sludge", "sediment"]) {
+    this._log("loadGroupsWithModels", { groupNames });
 
     const results = {};
     const promises = groupNames.map(async (groupName) => {
@@ -347,9 +372,9 @@ window.AdditionalInformationApi = {
    * @returns {Object} Object with group names as keys and filtered schemas as values
    */
   organizeSchemasByGroup(schemas, groupModelsData) {
-    this._log('organizeSchemasByGroup', {
+    this._log("organizeSchemasByGroup", {
       schemaCount: Object.keys(schemas).length,
-      groupCount: Object.keys(groupModelsData).length
+      groupCount: Object.keys(groupModelsData).length,
     });
 
     const organized = {};
@@ -377,18 +402,18 @@ window.AdditionalInformationApi = {
    * @param {Array<string>} groupNames - Defaults to ['soil', 'sludge', 'sediment']
    * @returns {Promise<{schemas, groupSchemas, groupModels}>}
    */
-  async loadSchemasWithGroups(groupNames = ['soil', 'sludge', 'sediment']) {
-    this._log('loadSchemasWithGroups', { groupNames });
+  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)
+      this.loadGroupsWithModels(groupNames),
     ]);
 
     // Organize schemas by group
     const groupSchemas = this.organizeSchemasByGroup(schemas, groupModels);
 
     return { schemas, groupSchemas, groupModels };
-  }
+  },
 };
diff --git a/static/js/utils/timeseries-chart.js b/static/js/utils/timeseries-chart.js
new file mode 100644
index 00000000..1d6c5d5e
--- /dev/null
+++ b/static/js/utils/timeseries-chart.js
@@ -0,0 +1,351 @@
+/**
+ * TimeSeriesChart Utility
+ *
+ * Provides chart rendering capabilities for time series data with error bounds.
+ * Uses Chart.js to create interactive and static visualizations.
+ *
+ * Usage:
+ *   const chart = window.TimeSeriesChart.create(canvas, {
+ *     measurements: [...],
+ *     xAxisLabel: "Time",
+ *     yAxisLabel: "Concentration",
+ *     xAxisUnit: "days",
+ *     yAxisUnit: "mg/L"
+ *   });
+ *
+ *   window.TimeSeriesChart.update(chart, newMeasurements, options);
+ *   window.TimeSeriesChart.destroy(chart);
+ */
+window.TimeSeriesChart = {
+  // === PUBLIC API ===
+
+  /**
+   * Create an interactive time series chart
+   *
+   * @param {HTMLCanvasElement} canvas - Canvas element to render chart on
+   * @param {Object} options - Chart configuration options
+   * @param {Array} options.measurements - Array of measurement objects with timestamp, value, error, note
+   * @param {string} options.xAxisLabel - Label for x-axis (default: "Time")
+   * @param {string} options.yAxisLabel - Label for y-axis (default: "Value")
+   * @param {string} options.xAxisUnit - Unit for x-axis (default: "")
+   * @param {string} options.yAxisUnit - Unit for y-axis (default: "")
+   * @returns {Chart|null} Chart.js instance or null if creation failed
+   */
+  create(canvas, options = {}) {
+    if (!this._validateCanvas(canvas)) return null;
+    if (!window.Chart) {
+      console.warn("Chart.js is not loaded");
+      return null;
+    }
+
+    const ctx = canvas.getContext("2d");
+    if (!ctx) return null;
+
+    const chartData = this._transformData(options.measurements || [], options);
+
+    if (chartData.datasets.length === 0) {
+      return null; // No data to display
+    }
+
+    const config = this._buildConfig(chartData, options);
+
+    return new Chart(ctx, config);
+  },
+
+  /**
+   * Update an existing chart with new data
+   *
+   * @param {Chart} chartInstance - Chart.js instance to update
+   * @param {Array} measurements - New measurements array
+   * @param {Object} options - Chart configuration options
+   */
+  update(chartInstance, measurements, options = {}) {
+    if (!chartInstance) return;
+
+    const chartData = this._transformData(measurements || [], options);
+
+    chartInstance.data.datasets = chartData.datasets;
+    chartInstance.options.scales.x.title.text = chartData.xAxisLabel;
+    chartInstance.options.scales.y.title.text = chartData.yAxisLabel;
+    chartInstance.update("none");
+  },
+
+  /**
+   * Destroy chart instance and cleanup
+   *
+   * @param {Chart} chartInstance - Chart.js instance to destroy
+   */
+  destroy(chartInstance) {
+    if (chartInstance && typeof chartInstance.destroy === "function") {
+      chartInstance.destroy();
+    }
+  },
+
+  // === PRIVATE HELPERS ===
+
+  /**
+   * Transform measurements into Chart.js datasets
+   * @private
+   */
+  _transformData(measurements, options) {
+    const preparedData = this._prepareData(measurements);
+
+    if (preparedData.length === 0) {
+      return { datasets: [], xAxisLabel: "Time", yAxisLabel: "Value" };
+    }
+
+    const xAxisLabel = options.xAxisLabel || "Time";
+    const yAxisLabel = options.yAxisLabel || "Value";
+    const xAxisUnit = options.xAxisUnit || "";
+    const yAxisUnit = options.yAxisUnit || "";
+
+    const datasets = [];
+
+    // Error bounds datasets FIRST (if errors exist) - renders as background
+    const errorDatasets = this._buildErrorDatasets(preparedData);
+    if (errorDatasets.length > 0) {
+      datasets.push(...errorDatasets);
+    }
+
+    // Main line dataset LAST - renders on top
+    datasets.push(this._buildMainDataset(preparedData, yAxisLabel));
+
+    return {
+      datasets: datasets,
+      xAxisLabel: this._formatAxisLabel(xAxisLabel, xAxisUnit),
+      yAxisLabel: this._formatAxisLabel(yAxisLabel, yAxisUnit),
+    };
+  },
+
+  /**
+   * Prepare and validate measurements data
+   * @private
+   */
+  _prepareData(measurements) {
+    return measurements
+      .filter(
+        (m) => m.timestamp != null && m.value != null,
+      )
+      .map((m) => {
+        // Normalize timestamp - handle both numeric and date strings
+        let timestamp;
+        if (typeof m.timestamp === "number") {
+          timestamp = m.timestamp;
+        } else {
+          timestamp = new Date(m.timestamp).getTime();
+        }
+        return {
+          ...m,
+          timestamp: timestamp,
+        };
+      })
+      .sort((a, b) => a.timestamp - b.timestamp);
+  },
+
+  /**
+   * Build main line dataset
+   * @private
+   */
+  _buildMainDataset(validMeasurements, yAxisLabel) {
+    return {
+      label: yAxisLabel,
+      data: validMeasurements.map((m) => ({
+        x: m.timestamp,
+        y: m.value,
+        error: m.error || null,
+      })),
+      borderColor: "rgb(59, 130, 246)",
+      backgroundColor: "rgba(59, 130, 246, 0.1)",
+      tension: 0.1,
+      pointRadius: 0, // Hide individual points
+      pointHoverRadius: 6,
+      fill: false,
+    };
+  },
+
+  /**
+   * Build error bound datasets (upper and lower)
+   * @private
+   */
+  _buildErrorDatasets(validMeasurements) {
+    const hasErrors = validMeasurements.some(
+      (m) => m.error !== null && m.error !== undefined && m.error > 0,
+    );
+
+    if (!hasErrors) return [];
+
+    const measurementsWithErrors = validMeasurements.filter(
+      (m) => m.error !== null && m.error !== undefined && m.error > 0,
+    );
+
+    return [
+      // Lower error bound - FIRST (bottom layer)
+      {
+        label: "Error (lower)",
+        data: measurementsWithErrors.map((m) => ({
+          x: m.timestamp,
+          y: m.value - m.error,
+        })),
+        borderColor: "rgba(59, 130, 246, 0.3)",
+        backgroundColor: "rgba(59, 130, 246, 0.15)",
+        pointRadius: 0,
+        fill: false,
+        tension: 0.1,
+      },
+      // Upper error bound - SECOND (fill back to lower)
+      {
+        label: "Error (upper)",
+        data: measurementsWithErrors.map((m) => ({
+          x: m.timestamp,
+          y: m.value + m.error,
+        })),
+        borderColor: "rgba(59, 130, 246, 0.3)",
+        backgroundColor: "rgba(59, 130, 246, 0.15)",
+        pointRadius: 0,
+        fill: "-1", // Fill back to previous dataset (lower bound)
+        tension: 0.1,
+      },
+    ];
+  },
+
+  /**
+   * Build complete Chart.js configuration
+   * @private
+   */
+  _buildConfig(chartData, options) {
+    return {
+      type: "line",
+      data: { datasets: chartData.datasets },
+      options: {
+        responsive: true,
+        maintainAspectRatio: false,
+        interaction: {
+          intersect: false,
+          mode: "index",
+        },
+        plugins: {
+          legend: {
+            display: false,
+          },
+          tooltip: this._buildTooltipConfig(
+            options.xAxisUnit || "",
+            options.yAxisUnit || "",
+          ),
+        },
+        scales: this._buildScalesConfig(
+          chartData.xAxisLabel,
+          chartData.yAxisLabel,
+        ),
+      },
+    };
+  },
+
+  /**
+   * Build tooltip configuration with custom callbacks
+   * @private
+   */
+  _buildTooltipConfig(xAxisUnit, yAxisUnit) {
+    return {
+      enabled: true,
+      callbacks: {
+        title: (contexts) => {
+          // Show timestamp
+          const context = contexts[0];
+          if (!context) return "Measurement";
+          const timestamp = context.parsed.x;
+          return xAxisUnit
+            ? `Time: ${timestamp} ${xAxisUnit}`
+            : `Time: ${timestamp}`;
+        },
+        label: (context) => {
+          // Show value with unit
+          try {
+            const value = context.parsed.y;
+            if (value === null || value === undefined) {
+              return `${context.dataset.label || "Value"}: N/A`;
+            }
+
+            const valueStr = yAxisUnit
+              ? `${value} ${yAxisUnit}`
+              : String(value);
+            return `${context.dataset.label || "Value"}: ${valueStr}`;
+          } catch (e) {
+            console.error("Tooltip label error:", e);
+            return `${context.dataset.label || "Value"}: ${context.parsed.y ?? "N/A"}`;
+          }
+        },
+        afterLabel: (context) => {
+          // Show error information
+          try {
+            const point = context.raw;
+            // Main line is now the last dataset (after error bounds if they exist)
+            const isMainDataset = context.dataset.label &&
+                                 !context.dataset.label.startsWith("Error");
+            if (!point || !isMainDataset) return null;
+
+            const lines = [];
+
+            // Show error if available
+            if (
+              point.error !== null &&
+              point.error !== undefined &&
+              point.error > 0
+            ) {
+              const errorStr = yAxisUnit
+                ? `±${point.error.toFixed(4)} ${yAxisUnit}`
+                : `±${point.error.toFixed(4)}`;
+              lines.push(`Error: ${errorStr}`);
+            }
+
+            return lines.length > 0 ? lines : null;
+          } catch (e) {
+            console.error("Tooltip afterLabel error:", e);
+            return null;
+          }
+        },
+      },
+    };
+  },
+
+  /**
+   * Build scales configuration
+   * @private
+   */
+  _buildScalesConfig(xAxisLabel, yAxisLabel) {
+    return {
+      x: {
+        type: "linear",
+        title: {
+          display: true,
+          text: xAxisLabel || "Time",
+        },
+      },
+      y: {
+        title: {
+          display: true,
+          text: yAxisLabel || "Value",
+        },
+      },
+    };
+  },
+
+  /**
+   * Format axis label with unit
+   * @private
+   */
+  _formatAxisLabel(label, unit) {
+    return unit ? `${label} (${unit})` : label;
+  },
+
+  /**
+   * Validate canvas element
+   * @private
+   */
+  _validateCanvas(canvas) {
+    if (!canvas || !(canvas instanceof HTMLCanvasElement)) {
+      console.warn("Invalid canvas element provided to TimeSeriesChart");
+      return false;
+    }
+    return true;
+  },
+};
diff --git a/templates/components/schema_form.html b/templates/components/schema_form.html
index 7b897320..ba17e551 100644
--- a/templates/components/schema_form.html
+++ b/templates/components/schema_form.html
@@ -34,7 +34,7 @@
             x-if="getWidget(fieldName, schema.properties[fieldName]) === 'text'"
           >
             <div
-              x-data="textWidget(fieldName, data, schema, uiSchema, fieldErrors, mode)"
+              x-data="textWidget(fieldName, data, schema, uiSchema, mode, debugErrors, context)"
             >
               {% include "components/widgets/text_widget.html" %}
             </div>
@@ -45,7 +45,7 @@
             x-if="getWidget(fieldName, schema.properties[fieldName]) === 'textarea'"
           >
             <div
-              x-data="textareaWidget(fieldName, data, schema, uiSchema, fieldErrors, mode)"
+              x-data="textareaWidget(fieldName, data, schema, uiSchema, mode, debugErrors, context)"
             >
               {% include "components/widgets/textarea_widget.html" %}
             </div>
@@ -56,7 +56,7 @@
             x-if="getWidget(fieldName, schema.properties[fieldName]) === 'number'"
           >
             <div
-              x-data="numberWidget(fieldName, data, schema, uiSchema, fieldErrors, mode)"
+              x-data="numberWidget(fieldName, data, schema, uiSchema, mode, debugErrors, context)"
             >
               {% include "components/widgets/number_widget.html" %}
             </div>
@@ -67,7 +67,7 @@
             x-if="getWidget(fieldName, schema.properties[fieldName]) === 'select'"
           >
             <div
-              x-data="selectWidget(fieldName, data, schema, uiSchema, fieldErrors, mode)"
+              x-data="selectWidget(fieldName, data, schema, uiSchema, mode, debugErrors, context)"
             >
               {% include "components/widgets/select_widget.html" %}
             </div>
@@ -78,7 +78,7 @@
             x-if="getWidget(fieldName, schema.properties[fieldName]) === 'checkbox'"
           >
             <div
-              x-data="checkboxWidget(fieldName, data, schema, uiSchema, fieldErrors, mode)"
+              x-data="checkboxWidget(fieldName, data, schema, uiSchema, mode, debugErrors, context)"
             >
               {% include "components/widgets/checkbox_widget.html" %}
             </div>
@@ -89,7 +89,7 @@
             x-if="getWidget(fieldName, schema.properties[fieldName]) === 'interval'"
           >
             <div
-              x-data="intervalWidget(fieldName, data, schema, uiSchema, fieldErrors, mode)"
+              x-data="intervalWidget(fieldName, data, schema, uiSchema, mode, debugErrors, context)"
             >
               {% include "components/widgets/interval_widget.html" %}
             </div>
@@ -100,7 +100,7 @@
             x-if="getWidget(fieldName, schema.properties[fieldName]) === 'pubmed-link'"
           >
             <div
-              x-data="pubmedWidget(fieldName, data, schema, uiSchema, fieldErrors, mode)"
+              x-data="pubmedWidget(fieldName, data, schema, uiSchema, mode, debugErrors, context)"
             >
               {% include "components/widgets/pubmed_link_widget.html" %}
             </div>
@@ -111,11 +111,22 @@
             x-if="getWidget(fieldName, schema.properties[fieldName]) === 'compound-link'"
           >
             <div
-              x-data="compoundWidget(fieldName, data, schema, uiSchema, fieldErrors, mode)"
+              x-data="compoundWidget(fieldName, data, schema, uiSchema, mode, debugErrors, context)"
             >
               {% include "components/widgets/compound_link_widget.html" %}
             </div>
           </template>
+
+          <!-- TimeSeries table widget -->
+          <template
+            x-if="getWidget(fieldName, schema.properties[fieldName]) === 'timeseries-table'"
+          >
+            <div
+              x-data="timeseriesTableWidget(fieldName, data, schema, uiSchema, mode, debugErrors, context)"
+            >
+              {% include "components/widgets/timeseries_table_widget.html" %}
+            </div>
+          </template>
         </div>
       </template>
 
diff --git a/templates/components/widgets/checkbox_widget.html b/templates/components/widgets/checkbox_widget.html
index be2059e6..368ddbc5 100644
--- a/templates/components/widgets/checkbox_widget.html
+++ b/templates/components/widgets/checkbox_widget.html
@@ -6,7 +6,7 @@
       <span
         class="label-text"
         :class="{
-              'text-error': hasError,
+              'text-error': $store.validationErrors.hasError(fieldName, context),
               'text-sm text-base-content/60': isViewMode
             }"
         x-text="label"
@@ -38,9 +38,12 @@
       </template>
 
       <!-- Errors -->
-      <template x-if="hasError">
+      <template x-if="$store.validationErrors.hasError(fieldName, context)">
         <div class="label">
-          <template x-for="errMsg in errors" :key="errMsg">
+          <template
+            x-for="errMsg in $store.validationErrors.getErrors(fieldName, context)"
+            :key="errMsg"
+          >
             <span class="label-text-alt text-error" x-text="errMsg"></span>
           </template>
         </div>
diff --git a/templates/components/widgets/compound_link_widget.html b/templates/components/widgets/compound_link_widget.html
index 4bd43624..f08c50f5 100644
--- a/templates/components/widgets/compound_link_widget.html
+++ b/templates/components/widgets/compound_link_widget.html
@@ -6,7 +6,7 @@
       <span
         class="label-text"
         :class="{
-              'text-error': hasError,
+              'text-error': $store.validationErrors.hasError(fieldName, context),
               'text-sm text-base-content/60': isViewMode
             }"
         x-text="label"
@@ -47,16 +47,19 @@
         <input
           type="url"
           class="input input-bordered w-full"
-          :class="{ 'input-error': hasError }"
+          :class="{ 'input-error': $store.validationErrors.hasError(fieldName, context) }"
           placeholder="Compound URL"
           x-model="value"
         />
       </template>
 
       <!-- Errors -->
-      <template x-if="hasError">
+      <template x-if="$store.validationErrors.hasError(fieldName, context)">
         <div class="label">
-          <template x-for="errMsg in errors" :key="errMsg">
+          <template
+            x-for="errMsg in $store.validationErrors.getErrors(fieldName, context)"
+            :key="errMsg"
+          >
             <span class="label-text-alt text-error" x-text="errMsg"></span>
           </template>
         </div>
diff --git a/templates/components/widgets/interval_widget.html b/templates/components/widgets/interval_widget.html
index 46c2e025..030a1c98 100644
--- a/templates/components/widgets/interval_widget.html
+++ b/templates/components/widgets/interval_widget.html
@@ -6,7 +6,7 @@
       <span
         class="label-text"
         :class="{
-              'text-error': hasError,
+              'text-error': hasValidationError || $store.validationErrors.hasError(fieldName, context),
               'text-sm text-base-content/60': isViewMode
             }"
         x-text="label"
@@ -41,11 +41,11 @@
 
       <!-- Edit mode: two inputs with shared unit badge -->
       <template x-if="isEditMode">
-        <div class="flex gap-2 items-center">
+        <div class="flex items-center gap-2">
           <input
             type="number"
             class="input input-bordered flex-1"
-            :class="{ 'input-error': hasError }"
+            :class="{ 'input-error': hasValidationError || $store.validationErrors.hasError(fieldName, context) }"
             placeholder="Min"
             x-model="start"
           />
@@ -53,7 +53,7 @@
           <input
             type="number"
             class="input input-bordered flex-1"
-            :class="{ 'input-error': hasError }"
+            :class="{ 'input-error': hasValidationError || $store.validationErrors.hasError(fieldName, context) }"
             placeholder="Max"
             x-model="end"
           />
@@ -64,9 +64,22 @@
       </template>
 
       <!-- Errors -->
-      <template x-if="hasError">
+      <template
+        x-if="hasValidationError || $store.validationErrors.hasError(fieldName, context)"
+      >
         <div class="label">
-          <template x-for="errMsg in errors" :key="errMsg">
+          <!-- Client-side validation error -->
+          <template x-if="hasValidationError">
+            <span class="label-text-alt text-error">
+              Start value must be less than or equal to end value
+            </span>
+          </template>
+
+          <!-- Server-side validation errors from store -->
+          <template
+            x-for="errMsg in $store.validationErrors.getErrors(fieldName, context)"
+            :key="errMsg"
+          >
             <span class="label-text-alt text-error" x-text="errMsg"></span>
           </template>
         </div>
diff --git a/templates/components/widgets/number_widget.html b/templates/components/widgets/number_widget.html
index 6ec1a502..ead924d1 100644
--- a/templates/components/widgets/number_widget.html
+++ b/templates/components/widgets/number_widget.html
@@ -6,7 +6,7 @@
       <span
         class="label-text"
         :class="{
-              'text-error': hasError,
+              'text-error': $store.validationErrors.hasError(fieldName, context),
               'text-sm text-base-content/60': isViewMode
             }"
         x-text="label"
@@ -41,7 +41,7 @@
           <input
             type="number"
             :class="unit ? 'input input-bordered join-item flex-1' : 'input input-bordered w-full'"
-            class:input-error="hasError"
+            class:input-error="$store.validationErrors.hasError(fieldName, context)"
             x-model="value"
           />
           <template x-if="unit">
@@ -54,9 +54,12 @@
       </template>
 
       <!-- Errors -->
-      <template x-if="hasError">
+      <template x-if="$store.validationErrors.hasError(fieldName, context)">
         <div class="label">
-          <template x-for="errMsg in errors" :key="errMsg">
+          <template
+            x-for="errMsg in $store.validationErrors.getErrors(fieldName, context)"
+            :key="errMsg"
+          >
             <span class="label-text-alt text-error" x-text="errMsg"></span>
           </template>
         </div>
diff --git a/templates/components/widgets/pubmed_link_widget.html b/templates/components/widgets/pubmed_link_widget.html
index a91e4f1d..f8de558d 100644
--- a/templates/components/widgets/pubmed_link_widget.html
+++ b/templates/components/widgets/pubmed_link_widget.html
@@ -6,7 +6,7 @@
       <span
         class="label-text"
         :class="{
-              'text-error': hasError,
+              'text-error': $store.validationErrors.hasError(fieldName, context),
               'text-sm text-base-content/60': isViewMode
             }"
         x-text="label"
@@ -47,16 +47,19 @@
         <input
           type="text"
           class="input input-bordered w-full"
-          :class="{ 'input-error': hasError }"
+          :class="{ 'input-error': $store.validationErrors.hasError(fieldName, context) }"
           placeholder="PubMed ID"
           x-model="value"
         />
       </template>
 
       <!-- Errors -->
-      <template x-if="hasError">
+      <template x-if="$store.validationErrors.hasError(fieldName, context)">
         <div class="label">
-          <template x-for="errMsg in errors" :key="errMsg">
+          <template
+            x-for="errMsg in $store.validationErrors.getErrors(fieldName, context)"
+            :key="errMsg"
+          >
             <span class="label-text-alt text-error" x-text="errMsg"></span>
           </template>
         </div>
diff --git a/templates/components/widgets/select_widget.html b/templates/components/widgets/select_widget.html
index 0d0a05a1..5940e440 100644
--- a/templates/components/widgets/select_widget.html
+++ b/templates/components/widgets/select_widget.html
@@ -6,7 +6,7 @@
       <span
         class="label-text"
         :class="{
-              'text-error': hasError,
+              'text-error': $store.validationErrors.hasError(fieldName, context),
               'text-sm text-base-content/60': isViewMode
             }"
         x-text="label"
@@ -41,7 +41,7 @@
       <template x-if="isEditMode">
         <select
           class="select select-bordered w-full"
-          :class="{ 'select-error': hasError }"
+          :class="{ 'select-error': $store.validationErrors.hasError(fieldName, context) }"
           x-model="value"
         >
           <option value="" :selected="!value">Select...</option>
@@ -56,9 +56,12 @@
       </template>
 
       <!-- Errors -->
-      <template x-if="hasError">
+      <template x-if="$store.validationErrors.hasError(fieldName, context)">
         <div class="label">
-          <template x-for="errMsg in errors" :key="errMsg">
+          <template
+            x-for="errMsg in $store.validationErrors.getErrors(fieldName, context)"
+            :key="errMsg"
+          >
             <span class="label-text-alt text-error" x-text="errMsg"></span>
           </template>
         </div>
diff --git a/templates/components/widgets/text_widget.html b/templates/components/widgets/text_widget.html
index 67af9c2e..66daaaf1 100644
--- a/templates/components/widgets/text_widget.html
+++ b/templates/components/widgets/text_widget.html
@@ -6,7 +6,7 @@
       <span
         class="label-text"
         :class="{
-              'text-error': hasError,
+              'text-error': $store.validationErrors.hasError(fieldName, context),
               'text-sm text-base-content/60': isViewMode
             }"
         x-text="label"
@@ -42,15 +42,18 @@
         <input
           type="text"
           class="input input-bordered w-full"
-          :class="{ 'input-error': hasError }"
+          :class="{ 'input-error': $store.validationErrors.hasError(fieldName, context) }"
           x-model="value"
         />
       </template>
 
       <!-- Errors -->
-      <template x-if="hasError">
+      <template x-if="$store.validationErrors.hasError(fieldName, context)">
         <div class="label">
-          <template x-for="errMsg in errors" :key="errMsg">
+          <template
+            x-for="errMsg in $store.validationErrors.getErrors(fieldName, context)"
+            :key="errMsg"
+          >
             <span class="label-text-alt text-error" x-text="errMsg"></span>
           </template>
         </div>
diff --git a/templates/components/widgets/textarea_widget.html b/templates/components/widgets/textarea_widget.html
index 3d57e1f1..b3fb2c57 100644
--- a/templates/components/widgets/textarea_widget.html
+++ b/templates/components/widgets/textarea_widget.html
@@ -6,7 +6,7 @@
       <span
         class="label-text"
         :class="{
-              'text-error': hasError,
+              'text-error': $store.validationErrors.hasError(fieldName, context),
               'text-sm text-base-content/60': isViewMode
             }"
         x-text="label"
@@ -41,15 +41,18 @@
       <template x-if="isEditMode">
         <textarea
           class="textarea textarea-bordered w-full"
-          :class="{ 'textarea-error': hasError }"
+          :class="{ 'textarea-error': $store.validationErrors.hasError(fieldName, context) }"
           x-model="value"
         ></textarea>
       </template>
 
       <!-- Errors -->
-      <template x-if="hasError">
+      <template x-if="$store.validationErrors.hasError(fieldName, context)">
         <div class="label">
-          <template x-for="errMsg in errors" :key="errMsg">
+          <template
+            x-for="errMsg in $store.validationErrors.getErrors(fieldName, context)"
+            :key="errMsg"
+          >
             <span class="label-text-alt text-error" x-text="errMsg"></span>
           </template>
         </div>
diff --git a/templates/components/widgets/timeseries_table_widget.html b/templates/components/widgets/timeseries_table_widget.html
new file mode 100644
index 00000000..3496c714
--- /dev/null
+++ b/templates/components/widgets/timeseries_table_widget.html
@@ -0,0 +1,234 @@
+{# TimeSeries table widget for measurement data #}
+<div class="form-control">
+  <div class="flex flex-col gap-2">
+    <!-- Label -->
+    <label class="label">
+      <span
+        class="label-text"
+        :class="{
+          'text-error': $store.validationErrors.hasError(fieldName, context),
+          'text-sm text-base-content/60': isViewMode
+        }"
+        x-text="label"
+      ></span>
+    </label>
+
+    <!-- Help text -->
+    <template x-if="helpText">
+      <div class="label">
+        <span
+          class="label-text-alt text-base-content/60"
+          x-text="helpText"
+        ></span>
+      </div>
+    </template>
+
+    <!-- Form-level validation errors (root errors) for timeseries -->
+    <template x-if="$store.validationErrors.hasError('root', context)">
+      <div class="text-error">
+        <template
+          x-for="errMsg in $store.validationErrors.getErrors('root', context)"
+          :key="errMsg"
+        >
+          <span x-text="errMsg"></span>
+        </template>
+      </div>
+    </template>
+
+    <!-- View mode: display measurements as chart -->
+    <template x-if="isViewMode">
+      <div class="space-y-4">
+        <!-- Chart container -->
+        <template x-if="measurements.length > 0">
+          <div class="w-full">
+            <div class="h-64 w-full">
+              <canvas x-ref="chartCanvas"></canvas>
+            </div>
+          </div>
+        </template>
+        <template x-if="measurements.length === 0">
+          <div class="text-base-content/60 text-sm italic">No measurements</div>
+        </template>
+
+        <!-- Description and Method metadata -->
+        <template x-if="description || method">
+          <div class="space-y-2 text-sm">
+            <template x-if="description">
+              <div>
+                <span class="text-base-content/80 font-semibold"
+                  >Description:</span
+                >
+                <p
+                  class="text-base-content/70 mt-1 whitespace-pre-wrap"
+                  x-text="description"
+                ></p>
+              </div>
+            </template>
+            <template x-if="method">
+              <div>
+                <span class="text-base-content/80 font-semibold">Method:</span>
+                <span class="text-base-content/70 ml-2" x-text="method"></span>
+              </div>
+            </template>
+          </div>
+        </template>
+      </div>
+    </template>
+
+    <!-- Edit mode: editable table with add/remove controls -->
+    <template x-if="isEditMode">
+      <div class="space-y-2">
+        <!-- Measurements table -->
+        <div class="overflow-x-auto">
+          <template x-if="measurements.length > 0">
+            <table class="table-zebra table-sm table">
+              <thead>
+                <tr>
+                  <th>Timestamp</th>
+                  <th>Value</th>
+                  <th>Error</th>
+                  <th>Note</th>
+                  <th class="w-12"></th>
+                </tr>
+              </thead>
+              <tbody>
+                <template
+                  x-for="(measurement, index) in measurements"
+                  :key="index"
+                >
+                  <tr>
+                    <td>
+                      <input
+                        type="number"
+                        class="input input-bordered input-sm w-full"
+                        :class="{ 'input-error': $store.validationErrors.hasError(fieldName, context) }"
+                        :value="formatTimestamp(measurement.timestamp)"
+                        @input="updateMeasurement(index, 'timestamp', $event.target.value)"
+                      />
+                    </td>
+                    <td>
+                      <input
+                        type="number"
+                        class="input input-bordered input-sm w-full"
+                        :class="{ 'input-error': $store.validationErrors.hasError(fieldName, context) }"
+                        placeholder="Value"
+                        :value="measurement.value"
+                        @input="updateMeasurement(index, 'value', $event.target.value)"
+                      />
+                    </td>
+                    <td>
+                      <input
+                        type="number"
+                        class="input input-bordered input-sm w-full"
+                        placeholder="±"
+                        :value="measurement.error"
+                        @input="updateMeasurement(index, 'error', $event.target.value)"
+                      />
+                    </td>
+                    <td>
+                      <input
+                        type="text"
+                        class="input input-bordered input-sm w-full"
+                        placeholder="Note"
+                        :value="measurement.note"
+                        @input="updateMeasurement(index, 'note', $event.target.value)"
+                      />
+                    </td>
+                    <td>
+                      <button
+                        type="button"
+                        class="btn btn-ghost btn-sm btn-circle"
+                        @click="removeMeasurement(index)"
+                        title="Remove measurement"
+                      >
+                        <svg
+                          xmlns="http://www.w3.org/2000/svg"
+                          class="h-4 w-4"
+                          fill="none"
+                          viewBox="0 0 24 24"
+                          stroke="currentColor"
+                        >
+                          <path
+                            stroke-linecap="round"
+                            stroke-linejoin="round"
+                            stroke-width="2"
+                            d="M6 18L18 6M6 6l12 12"
+                          />
+                        </svg>
+                      </button>
+                    </td>
+                  </tr>
+                </template>
+              </tbody>
+            </table>
+          </template>
+          <template x-if="measurements.length === 0">
+            <div class="text-base-content/60 py-2 text-sm italic">
+              No measurements yet. Click "Add Measurement" to start.
+            </div>
+          </template>
+        </div>
+
+        <!-- Action buttons -->
+        <div class="flex gap-2">
+          <button
+            type="button"
+            class="btn btn-sm btn-primary"
+            @click="addMeasurement()"
+          >
+            <svg
+              xmlns="http://www.w3.org/2000/svg"
+              class="h-4 w-4"
+              fill="none"
+              viewBox="0 0 24 24"
+              stroke="currentColor"
+            >
+              <path
+                stroke-linecap="round"
+                stroke-linejoin="round"
+                stroke-width="2"
+                d="M12 4v16m8-8H4"
+              />
+            </svg>
+            Add Measurement
+          </button>
+          <template x-if="measurements.length > 1">
+            <button
+              type="button"
+              class="btn btn-sm btn-ghost"
+              @click="sortByTimestamp()"
+            >
+              <svg
+                xmlns="http://www.w3.org/2000/svg"
+                class="h-4 w-4"
+                fill="none"
+                viewBox="0 0 24 24"
+                stroke="currentColor"
+              >
+                <path
+                  stroke-linecap="round"
+                  stroke-linejoin="round"
+                  stroke-width="2"
+                  d="M7 16V4m0 0L3 8m4-4l4 4m6 0v12m0 0l4-4m-4 4l-4-4"
+                />
+              </svg>
+              Sort by Timestamp
+            </button>
+          </template>
+        </div>
+      </div>
+    </template>
+
+    <!-- Errors -->
+    <template x-if="$store.validationErrors.hasError(fieldName, context)">
+      <div class="label">
+        <template
+          x-for="errMsg in $store.validationErrors.getErrors(fieldName, context)"
+          :key="errMsg"
+        >
+          <span class="label-text-alt text-error" x-text="errMsg"></span>
+        </template>
+      </div>
+    </template>
+  </div>
+</div>
diff --git a/templates/framework_modern.html b/templates/framework_modern.html
index 1135094c..b60ed929 100644
--- a/templates/framework_modern.html
+++ b/templates/framework_modern.html
@@ -21,6 +21,10 @@
       type="text/css"
     />
 
+    {# Chart.js - For timeseries charts #}
+    <script src="https://cdn.jsdelivr.net/npm/chart.js@4.4.0/dist/chart.umd.min.js"></script>
+    <script src="{% static 'js/utils/timeseries-chart.js' %}"></script>
+
     {# Alpine.js - For reactive components #}
     <script
       defer
@@ -31,6 +35,7 @@
     <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>
+    <script src="{% static 'js/alpine/components/widgets.js' %}"></script>
 
     {# Font Awesome #}
     <link
diff --git a/templates/modals/objects/add_additional_information_modal.html b/templates/modals/objects/add_additional_information_modal.html
index 831a6aa2..3246c8c0 100644
--- a/templates/modals/objects/add_additional_information_modal.html
+++ b/templates/modals/objects/add_additional_information_modal.html
@@ -18,7 +18,9 @@
       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));
+      const available = unique.filter(name =>
+        !this.existingTypes.includes(name) || this.schemas[name]?.schema?.['x-repeatable']
+      );
       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();
@@ -32,6 +34,9 @@
         // Reset formData when type changes and increment key to force re-render
         this.formData = null;
         this.formRenderKey++;
+        // Clear previous errors
+        this.error = null;
+        Alpine.store('validationErrors').clearErrors(); // No context - clears all
       });
 
       // Load schemas and existing items
@@ -63,6 +68,7 @@
       this.selectedType = '';
       this.error = null;
       this.formData = null;
+      Alpine.store('validationErrors').clearErrors(); // No context - clears all
     },
 
     setFormData(data) {
@@ -96,11 +102,12 @@
         window.location.reload();
       } catch (err) {
         if (err.isValidationError && err.fieldErrors) {
-          window.dispatchEvent(new CustomEvent('set-field-errors', {
-            detail: err.fieldErrors
-          }));
+          // No context for add modal - simple flat errors
+          Alpine.store('validationErrors').setErrors(err.fieldErrors);
+          this.error = err.message || 'Please correct the errors in the form';
+        } else {
+          this.error = err.message || 'An error occurred. Please try again.';
         }
-        this.error = err.message;
       } finally {
         this.isSubmitting = false;
       }
@@ -155,7 +162,7 @@
               <template x-for="name in sortedSchemaNames" :key="name">
                 <option
                   :value="name"
-                  x-text="(schemas[name].schema && schemas[name].schema['x-title']) || name"
+                  x-text="(schemas[name].schema && (schemas[name].schema['x-title'] || schemas[name].schema.title)) || name"
                 ></option>
               </template>
             </select>
@@ -169,6 +176,7 @@
                 x-data="schemaRenderer({
                   rjsf: schemas[selectedType],
                   mode: 'edit'
+                  // No context - single form, backward compatible
                 })"
                 x-init="await init(); $dispatch('form-data-ready', data)"
               >
diff --git a/templates/modals/objects/update_scenario_additional_information_modal.html b/templates/modals/objects/update_scenario_additional_information_modal.html
index 8758fbeb..3b894894 100644
--- a/templates/modals/objects/update_scenario_additional_information_modal.html
+++ b/templates/modals/objects/update_scenario_additional_information_modal.html
@@ -18,10 +18,10 @@
         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));
+        this.items = items;
       } catch (err) {
         this.error = err.message;
       } finally {
@@ -33,6 +33,7 @@
       this.isSubmitting = false;
       this.error = null;
       this.modifiedUuids.clear();
+      Alpine.store('validationErrors').clearErrors(); // Clear all contexts
     },
 
     updateItemData(uuid, data) {
@@ -74,18 +75,15 @@
       } 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
-              }
-            }));
-          }
+          this.error = err.message || 'Please correct the errors in the form';
+
+          // Backend returns errors keyed by UUID, each with field-level error arrays
+          // Set errors for each item with its UUID as context
+          Object.entries(err.fieldErrors).forEach(([uuid, fieldErrors]) => {
+            Alpine.store('validationErrors').setErrors(fieldErrors, uuid);
+          });
         } else {
-          this.error = err.message;
+          this.error = err.message || 'An error occurred. Please try again.';
         }
       } finally {
         this.isSubmitting = false;
@@ -133,7 +131,8 @@
                   x-data="schemaRenderer({
                     rjsf: schemas[item.type.toLowerCase()],
                     data: item.data,
-                    mode: 'edit'
+                    mode: 'edit',
+                    context: item.uuid  // Pass item UUID as context for error scoping
                   })"
                   x-init="await init(); $watch('data', (value) => { $dispatch('update-item-data', { uuid: item.uuid, data: value }) }, { deep: true })"
                 >