-- move table ALTER TABLE pod_nodes RENAME TO pod_nodes_history; -- add uuid index -- drop primary key -- new primary key CREATE SEQUENCE pod_nodes_version_id_sequence; ALTER TABLE pod_nodes_history DROP CONSTRAINT pod_nodes_pk CASCADE, ADD COLUMN version_id INTEGER PRIMARY KEY DEFAULT nextval('pod_nodes_version_id_sequence'); -- create view CREATE OR REPLACE VIEW pod_nodes AS SELECT DISTINCT ON (node_id) node_id, parent_id, node_order, node_type, created_at, updated_at, data_label, data_content, data_datetime, node_status, data_reminder_datetime, data_file_name, data_file_content, data_file_mime_type, parent_tree_path, node_depth, owner_id FROM pod_nodes_history ORDER BY node_id, updated_at DESC; CREATE OR REPLACE RULE pod_insert_new_node AS ON INSERT TO pod_nodes DO INSTEAD INSERT INTO pod_nodes_history (node_id, parent_id, node_order, node_type, created_at, updated_at, data_label, data_content, data_datetime, node_status, data_reminder_datetime, data_file_name, data_file_content, data_file_mime_type, parent_tree_path, node_depth, owner_id, version_id) VALUES (nextval('pod_nodes__node_id__sequence'), NEW.parent_id, NEW.node_order, NEW.node_type, NEW.created_at, NEW.updated_at, NEW.data_label, NEW.data_content, NEW.data_datetime, NEW.node_status, NEW.data_reminder_datetime, NEW.data_file_name, NEW.data_file_content, NEW.data_file_mime_type, NEW.parent_tree_path, NEW.node_depth, NEW.owner_id, nextval('pod_nodes_version_id_sequence')) RETURNING node_id, parent_id, node_order, node_type, created_at, updated_at, data_label, data_content, data_datetime, node_status, data_reminder_datetime, data_file_name, data_file_content, data_file_mime_type, parent_tree_path, node_depth, owner_id; CREATE OR REPLACE FUNCTION pod_update_node() RETURNS trigger AS $$ BEGIN INSERT INTO pod_nodes_history (node_id, parent_id, node_order, node_type, created_at, updated_at, data_label, data_content, data_datetime, node_status, data_reminder_datetime, data_file_name, data_file_content, data_file_mime_type, parent_tree_path, node_depth, owner_id, version_id) VALUES (NEW.node_id, NEW.parent_id, NEW.node_order, NEW.node_type, NEW.created_at, NEW.updated_at, NEW.data_label, NEW.data_content, NEW.data_datetime, NEW.node_status, NEW.data_reminder_datetime, NEW.data_file_name, NEW.data_file_content, NEW.data_file_mime_type, NEW.parent_tree_path, NEW.node_depth, NEW.owner_id, nextval('pod_nodes_version_id_sequence')); return new; END; $$ LANGUAGE plpgsql; CREATE TRIGGER pod_update_node_tg INSTEAD OF UPDATE ON pod_nodes FOR EACH ROW EXECUTE PROCEDURE pod_update_node();