debug: extensive logging for start_date persistence

- Log UPDATE SQL and parameters
- Verify saved values after UPDATE
- Show date types in list_goals response
- Track down why start_date not visible in UI

backend/routers/goals.py

@@ -349,6 +349,11 @@ def list_goals(session: dict = Depends(require_auth)):
             goals = [r2d(row) for row in cur.fetchall()]
             print(f"[DEBUG] Loaded {len(goals)} goals for profile {pid}")
 
+            # Debug: Show first goal with dates
+            if goals:
+                first = goals[0]
+                print(f"[DEBUG] First goal dates: start_date={first.get('start_date')} (type: {type(first.get('start_date'))}), target_date={first.get('target_date')} (type: {type(first.get('target_date'))})")
+
             # Update current values for each goal
             for goal in goals:
                 try:
@@ -580,10 +585,19 @@ def update_goal(goal_id: str, data: GoalUpdate, session: dict = Depends(require_
             updates.append("updated_at = NOW()")
             params.extend([goal_id, pid])
 
-            cur.execute(
-                f"UPDATE goals SET {', '.join(updates)} WHERE id = %s AND profile_id = %s",
-                tuple(params)
-            )
+            update_sql = f"UPDATE goals SET {', '.join(updates)} WHERE id = %s AND profile_id = %s"
+            print(f"[DEBUG] UPDATE SQL: {update_sql}")
+            print(f"[DEBUG] UPDATE params: {params}")
+
+            cur.execute(update_sql, tuple(params))
+
+            # Verify what was actually saved
+            cur.execute("""
+                SELECT id, goal_type, start_date, start_value, target_date, target_value
+                FROM goals WHERE id = %s
+            """, (goal_id,))
+            saved_goal = cur.fetchone()
+            print(f"[DEBUG] After UPDATE, goal in DB: {r2d(saved_goal)}")
 
         return {"message": "Ziel aktualisiert"}