Add child relation deletion by parent query: Introduced a new SQL query to delete child relations where the character is either a father or mother. Updated relevant workers to execute this query before deleting child relations, ensuring proper cleanup of relationships during character deletion.

src/worker/events.rs

@@ -43,6 +43,7 @@ use crate::worker::sql::{
     QUERY_DELETE_RELATIONSHIP,
     QUERY_GET_USER_ID,
     QUERY_DELETE_CHILD_RELATION,
+    QUERY_DELETE_CHILD_RELATION_BY_PARENT,
     QUERY_DELETE_CHARACTER,
     QUERY_GET_HEIR,
     QUERY_SET_CHARACTER_USER,
@@ -1486,8 +1487,10 @@ impl EventsWorker {
             Self::handle_inheritance(pool, broker, &mut conn, character_id, falukant_user_id)?;
         }
 
-        // 4) Child-Relations löschen und Eltern benachrichtigen
-    conn.prepare("delete_child_relation", QUERY_DELETE_CHILD_RELATION)?;
+        // 4) Child-Relations löschen (als Elter zuerst, dann als Kind) und Eltern benachrichtigen
+        conn.prepare("delete_child_relation_by_parent", QUERY_DELETE_CHILD_RELATION_BY_PARENT)?;
+        conn.execute("delete_child_relation_by_parent", &[&character_id])?;
+        conn.prepare("delete_child_relation", QUERY_DELETE_CHILD_RELATION)?;
         let child_result = conn.execute("delete_child_relation", &[&character_id])?;
         for row in child_result {
             if let Some(father_user_id) = row