Add Column
Current Schema
CREATE TABLE fact_sources (
fact_id TEXT NOT NULL,
event_id TEXT NOT NULL,
PRIMARY KEY (fact_id, event_id),
FOREIGN KEY (fact_id) REFERENCES facts(id) ON DELETE RESTRICT DEFERRABLE INITIALLY DEFERRED,
FOREIGN KEY (event_id) REFERENCES events(id) ON DELETE RESTRICT DEFERRABLE INITIALLY DEFERRED
)