debug: comprehensive error handling and logging for list_goals

- try-catch around entire endpoint
- try-catch for each goal progress update
- Detailed error logging with traceback
- Continue processing other goals if one fails
- Clear error message to frontend

This will show exact error location in logs.

backend/routers/goals.py

@@ -161,27 +161,42 @@ def list_goals(session: dict = Depends(require_auth)):
     """List all goals for current user"""
     pid = session['profile_id']
 
-    with get_db() as conn:
-        cur = get_cursor(conn)
-        cur.execute("""
-            SELECT id, goal_type, is_primary, status,
-                   target_value, current_value, start_value, unit,
-                   start_date, target_date, reached_date,
-                   name, description,
-                   progress_pct, projection_date, on_track,
-                   created_at, updated_at
-            FROM goals
-            WHERE profile_id = %s
-            ORDER BY is_primary DESC, created_at DESC
-        """, (pid,))
+    try:
+        with get_db() as conn:
+            cur = get_cursor(conn)
+            cur.execute("""
+                SELECT id, goal_type, is_primary, status,
+                       target_value, current_value, start_value, unit,
+                       start_date, target_date, reached_date,
+                       name, description,
+                       progress_pct, projection_date, on_track,
+                       created_at, updated_at
+                FROM goals
+                WHERE profile_id = %s
+                ORDER BY is_primary DESC, created_at DESC
+            """, (pid,))
 
-        goals = [r2d(row) for row in cur.fetchall()]
+            goals = [r2d(row) for row in cur.fetchall()]
+            print(f"[DEBUG] Loaded {len(goals)} goals for profile {pid}")
 
-        # Update current values for each goal
-        for goal in goals:
-            _update_goal_progress(conn, pid, goal)
+            # Update current values for each goal
+            for goal in goals:
+                try:
+                    _update_goal_progress(conn, pid, goal)
+                except Exception as e:
+                    print(f"[ERROR] Failed to update progress for goal {goal.get('id')}: {e}")
+                    # Continue with other goals even if one fails
 
-        return goals
+            return goals
+
+    except Exception as e:
+        print(f"[ERROR] list_goals failed: {e}")
+        import traceback
+        traceback.print_exc()
+        raise HTTPException(
+            status_code=500,
+            detail=f"Fehler beim Laden der Ziele: {str(e)}"
+        )
 
 @router.post("/create")
 def create_goal(data: GoalCreate, session: dict = Depends(require_auth)):