Added unique path constraint

01-paths-indexes.sql

@@ -36,5 +36,7 @@ CREATE UNIQUE INDEX file_path_idx ON node USING btree(path);
 ALTER TABLE node ADD COLUMN relative_path ltree GENERATED ALWAYS AS (path(parent_relative_path, node_id)) STORED;
 CREATE INDEX file_rel_path_gist_idx ON node USING GIST(relative_path);
 
+ALTER TABLE node ADD CONSTRAINT unique_path UNIQUE (parent_path, name);
+
 -- Create root node
 INSERT INTO node (parent_path, parent_relative_path, name, type, creator_id, is_public) VALUES (NULL, NULL, '', 'container', '0', true);