diff --git a/build.sh b/build.sh
index 8309a70..9327adb 100755
--- a/build.sh
+++ b/build.sh
@@ -33,6 +33,7 @@ BUSINESS_MODULES="world scene entity script_engine world_snapshot world_sync"
 
 APP_SRC_DIR="$(cd "$(dirname "$0")" && pwd)"
 mkdir -p "${DEPLOY_DIR}"
+export PATH="${VENV}/bin:${PATH}"
 
 echo "==> [0/9] venv"
 if [ ! -x "${VENV}/bin/python" ]; then
@@ -102,13 +103,12 @@ PY
 echo "==> [6/9] per-module install: ① json2ddl建表 ② json/build.sh ③ wwwroot软链 ④ 数据导入"
 for m in ${BUSINESS_MODULES}; do
     echo "  -- ${m}"
-    # ① 建表：模块 models 是唯一事实源；去掉 DROP 行，重跑不丢数据
+    # ① 建表：模块 models 是唯一事实源；json2ddl 输出 DROP+CREATE，每次部署权威重建
     (cd "pkgs/${m}/models" && "${VENV}/bin/json2ddl" mysql .) > "/tmp/${m}_ddl.sql" \
         || { echo "ERROR: ${m} json2ddl failed" >&2; exit 1; }
     [ -s "/tmp/${m}_ddl.sql" ] || { echo "ERROR: ${m} DDL empty" >&2; exit 1; }
-    grep -vi "^drop table" "/tmp/${m}_ddl.sql" > "/tmp/${m}_ddl_nodrop.sql"
     mysql -h "${DB_HOST}" -P "${DB_PORT}" -u "${DB_USER}" -p"${DB_PASSWORD}" "${DB_NAME}" \
-        < "/tmp/${m}_ddl_nodrop.sql" || { echo "ERROR: ${m} create tables failed" >&2; exit 1; }
+        < "/tmp/${m}_ddl.sql" || { echo "ERROR: ${m} create tables failed" >&2; exit 1; }
     # ② CRUD 页面（模块仓库自带 json/build.sh）
     (cd "pkgs/${m}/json" && bash build.sh) || { echo "ERROR: ${m} json/build.sh failed" >&2; exit 1; }
     # ③ wwwroot 软链（非 cp）