fix: Better error handling for goal types loading

- Check if goal_type_definitions table exists
- Detailed error messages
- Fallback if goalTypes is empty
- Prevent form opening without types

Helps debugging Migration 024 issues.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/routers/goals.py

@@ -14,6 +14,7 @@ from pydantic import BaseModel
 from typing import Optional, List
 from datetime import date, datetime, timedelta
 from decimal import Decimal
+import traceback
 
 from db import get_db, get_cursor, r2d
 from auth import require_auth
@@ -499,24 +500,51 @@ def list_goal_type_definitions(session: dict = Depends(require_auth)):
 
     Public endpoint - returns all available goal types for dropdown.
     """
-    with get_db() as conn:
+    try:
-        cur = get_cursor(conn)
+        with get_db() as conn:
-        cur.execute("""
+            cur = get_cursor(conn)
-            SELECT id, type_key, label_de, label_en, unit, icon, category,
-                   source_table, source_column, aggregation_method,
-                   calculation_formula, description, is_system,
-                   created_at, updated_at
-            FROM goal_type_definitions
-            WHERE is_active = true
-            ORDER BY
-                CASE
-                    WHEN is_system = true THEN 0
-                    ELSE 1
-                END,
-                label_de
-        """)
 
-        return [r2d(row) for row in cur.fetchall()]
+            # Check if table exists first
+            cur.execute("""
+                SELECT EXISTS (
+                    SELECT FROM information_schema.tables
+                    WHERE table_name = 'goal_type_definitions'
+                )
+            """)
+            table_exists = cur.fetchone()[0]
+
+            if not table_exists:
+                print("[ERROR] goal_type_definitions table does not exist!")
+                raise HTTPException(
+                    status_code=500,
+                    detail="Goal Types Tabelle existiert nicht. Migration 024 muss ausgeführt werden."
+                )
+
+            cur.execute("""
+                SELECT id, type_key, label_de, label_en, unit, icon, category,
+                       source_table, source_column, aggregation_method,
+                       calculation_formula, description, is_system,
+                       created_at, updated_at
+                FROM goal_type_definitions
+                WHERE is_active = true
+                ORDER BY
+                    CASE
+                        WHEN is_system = true THEN 0
+                        ELSE 1
+                    END,
+                    label_de
+            """)
+
+            return [r2d(row) for row in cur.fetchall()]
+    except HTTPException:
+        raise
+    except Exception as e:
+        print(f"[ERROR] list_goal_type_definitions failed: {e}")
+        print(traceback.format_exc())
+        raise HTTPException(
+            status_code=500,
+            detail=f"Fehler beim Laden der Goal Types: {str(e)}"
+        )
 
 @router.post("/goal-types")
 def create_goal_type_definition(

frontend/src/pages/GoalsPage.jsx

@@ -84,21 +84,23 @@ export default function GoalsPage() {
 
       // Convert types array to map for quick lookup
       const typesMap = {}
-      typesData.forEach(type => {
+      if (typesData && Array.isArray(typesData)) {
-        typesMap[type.type_key] = {
+        typesData.forEach(type => {
-          label: type.label_de,
+          typesMap[type.type_key] = {
-          unit: type.unit,
+            label: type.label_de,
-          icon: type.icon || '📊',
+            unit: type.unit,
-          category: type.category,
+            icon: type.icon || '📊',
-          is_system: type.is_system
+            category: type.category,
-        }
+            is_system: type.is_system
-      })
+          }
+        })
+      }
 
-      setGoalTypes(typesData)
+      setGoalTypes(typesData || [])
       setGoalTypesMap(typesMap)
     } catch (err) {
       console.error('Failed to load goals:', err)
-      setError('Fehler beim Laden der Ziele')
+      setError(`Fehler beim Laden: ${err.message || err.toString()}`)
     } finally {
       setLoading(false)
     }
@@ -121,8 +123,12 @@ export default function GoalsPage() {
   }
 
   const handleCreateGoal = () => {
+    if (goalTypes.length === 0) {
+      setError('Keine Goal Types verfügbar. Bitte Admin kontaktieren.')
+      return
+    }
     setEditingGoal(null)
-    const firstType = goalTypes.length > 0 ? goalTypes[0].type_key : 'weight'
+    const firstType = goalTypes[0].type_key
     setFormData({
       goal_type: firstType,
       is_primary: goals.length === 0, // First goal is primary by default