PR #2111 / Issue #2110 — 修补 #2107 漏 UPDATE 路径; MP NOT_NULL 默认跳过 null 导致 child=0 时 toddler_discount DB 列残留. @TableField(updateStrategy=IGNORED) 强制 UPDATE 写入, 测试服 4 场景 DB 真测通过. 前端无需改动. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>