diff --git a/build.sh b/build.sh
index 152294b..21e76e4 100755
--- a/build.sh
+++ b/build.sh
@@ -47,11 +47,24 @@ ln -sf ../pkgs/bricks/dist wwwroot/bricks 2>/dev/null || true
 ln -sf ../pkgs/rbac/wwwroot wwwroot/rbac 2>/dev/null || true
 ln -sf ../pkgs/rag/wwwroot wwwroot/rag 2>/dev/null || true
 
-# Generate DDL from rag module models
+# Migrate legacy table names to rag_ prefix (idempotent, must run BEFORE DDL)
+# rag 模块表统一加 rag_ 前缀，避免模块跨应用复用时与业务表名冲突
+if [ -f pkgs/rag/init/migrate_rag_prefix.sql ]; then
+    echo "== migrating legacy table names to rag_ prefix =="
+    mysql -h db -utest -ptest123 rag < pkgs/rag/init/migrate_rag_prefix.sql || {
+        echo "ERROR: table prefix migration failed" >&2; exit 1; }
+fi
+
+# Generate DDL from rag module models (creates any missing rag_* tables)
 if ls pkgs/rag/models/*.json >/dev/null 2>&1; then
     cd pkgs/rag/models
-    json2ddl mysql . > /tmp/rag_ddl.sql
-    mysql -h db -utest -ptest123 rag < /tmp/rag_ddl.sql 2>/dev/null || echo "DDL apply skipped"
+    # 不再吞掉错误：models/ 曾误放 CRUD 格式(缺 summary)导致 json2ddl 全量失败被静默忽略
+    json2ddl mysql . > /tmp/rag_ddl.sql || { echo "ERROR: json2ddl failed" >&2; cd $cdir; exit 1; }
+    if [ ! -s /tmp/rag_ddl.sql ]; then
+        echo "ERROR: generated DDL is empty — check models/*.json format (need summary+fields)" >&2
+        cd $cdir; exit 1
+    fi
+    mysql -h db -utest -ptest123 rag < /tmp/rag_ddl.sql || echo "WARN: some DDL statements failed (tables may already exist)"
     cd $cdir
 fi