ALTER TABLE teams DROP FOREIGN KEY teams_area_fk;
ALTER TABLE reports DROP FOREIGN KEY reports_area_fk;

ALTER TABLE areas DROP COLUMN active;

ALTER TABLE teams
    ADD CONSTRAINT teams_area_fk
    FOREIGN KEY (area_id) REFERENCES areas(id) ON DELETE SET NULL;

ALTER TABLE reports
    ADD CONSTRAINT reports_area_fk
    FOREIGN KEY (area_id) REFERENCES areas(id) ON DELETE SET NULL;