+CREATE TABLE process_steps (
+ step_id INTEGER PRIMARY KEY,
+ owner_id INTEGER NOT NULL,
+ step_process_id INTEGER NOT NULL,
+ parent_step_id INTEGER,
+ FOREIGN KEY (owner_id) REFERENCES processes(id),
+ FOREIGN KEY (step_process_id) REFERENCES processes(id),
+ FOREIGN KEY (parent_step_id) REFERENCES process_steps(step_id)
+);