fix: Migration 024 - remove problematic FK constraints created_by/updated_by

Goal type definitions are global system entities, not user-specific.
System types seeded in migration cannot have created_by FK.

Changes:
- Remove created_by/updated_by columns from goal_type_definitions
- Update CREATE/UPDATE endpoints to not use these fields
- Migration now runs cleanly on container start
- No manual intervention needed for production deployment

backend/migrations/024_goal_type_registry.sql

@@ -36,9 +36,7 @@ CREATE TABLE IF NOT EXISTS goal_type_definitions (
 
     -- Audit
     created_at TIMESTAMP DEFAULT NOW(),
-    updated_at TIMESTAMP DEFAULT NOW(),
-    created_by UUID REFERENCES profiles(id) ON DELETE SET NULL,
-    updated_by UUID REFERENCES profiles(id) ON DELETE SET NULL
+    updated_at TIMESTAMP DEFAULT NOW()
 );
 
 CREATE INDEX IF NOT EXISTS idx_goal_type_definitions_active ON goal_type_definitions(is_active) WHERE is_active = true;

backend/routers/goals.py

@@ -572,16 +572,14 @@ def create_goal_type_definition(
             INSERT INTO goal_type_definitions (
                 type_key, label_de, label_en, unit, icon, category,
                 source_table, source_column, aggregation_method,
-                calculation_formula, description, is_active, is_system,
-                created_by, updated_by
-            ) VALUES (%s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s)
+                calculation_formula, description, is_active, is_system
+            ) VALUES (%s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s)
             RETURNING id
         """, (
             data.type_key, data.label_de, data.label_en, data.unit, data.icon,
             data.category, data.source_table, data.source_column,
             data.aggregation_method, data.calculation_formula, data.description,
-            True, False,  # is_active=True, is_system=False
-            pid, pid
+            True, False  # is_active=True, is_system=False
         ))
 
         goal_type_id = cur.fetchone()['id']
@@ -677,8 +675,6 @@ def update_goal_type_definition(
             raise HTTPException(status_code=400, detail="Keine Änderungen angegeben")
 
         updates.append("updated_at = NOW()")
-        updates.append("updated_by = %s")
-        params.append(pid)
         params.append(goal_type_id)
 
         cur.execute(