CREATE TABLE organization ( id bigserial PRIMARY KEY ); CREATE TABLE _organization_data ( id serial PRIMARY KEY, _start_t timestamp NOT NULL, _end_t timestamp, _table bigint NOT NULL, own_entity bigint ); ALTER TABLE _organization_data ADD CONSTRAINT _table_fk FOREIGN KEY (_table) REFERENCES organization; ALTER TABLE _organization_data ADD CONSTRAINT own_entity_fk FOREIGN KEY (own_entity) REFERENCES own_entity;