fix(nacos): Avoid reimporting existing schema

- Check for the Nacos config table before importing schema
- Preserve config seeding only when no config rows exist
- Prevent init failures when the database is already initialized

backend/sql/nacos-init.sh

@@ -16,7 +16,14 @@ mysql_exec() {
 
 echo "Preparing Nacos database ${MYSQL_DB}..."
 mysql_exec -e "CREATE DATABASE IF NOT EXISTS \`${MYSQL_DB}\` CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;"
+
+schema_exists="$(mysql_exec -N -s -e "SELECT COUNT(*) FROM information_schema.TABLES WHERE TABLE_SCHEMA='${MYSQL_DB}' AND TABLE_NAME='config_info';" 2>/dev/null || echo 0)"
+if [ "${schema_exists}" -eq 0 ]; then
+  echo "Initializing Nacos schema..."
   mysql_exec "$MYSQL_DB" < /init-sql/nacos-schema.sql
+else
+  echo "Nacos schema already exists, skip schema import."
+fi
 
 if row_count="$(mysql_exec -N -s -e "SELECT COUNT(*) FROM \`${MYSQL_DB}\`.config_info;" 2>/dev/null)"; then
   :
@@ -30,4 +37,3 @@ if [ "${row_count}" -eq 0 ]; then
 else
   echo "Nacos config already exists, skip seeding."
 fi
-