first commit

sql/sys_menu_wcs_20260729.sql

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+-- Independent WCS menu table. Copy schema and initial data from sys_menu.
+CREATE TABLE IF NOT EXISTS sys_menu_wcs LIKE sys_menu;
+
+-- Initialize only when the new table is empty.
+INSERT INTO sys_menu_wcs
+SELECT source_menu.*
+FROM sys_menu source_menu
+WHERE NOT EXISTS (SELECT 1 FROM sys_menu_wcs LIMIT 1);