ALTER TABLE vaccinations ADD COLUMN manufacturer TEXT;
ALTER TABLE vaccinations ADD COLUMN batch_expires_on TEXT;
ALTER TABLE vaccinations ADD COLUMN administered_by_user_id INTEGER REFERENCES users(id) ON DELETE SET NULL;
ALTER TABLE vaccinations ADD COLUMN administered_by_name TEXT;
CREATE INDEX idx_vaccinations_batch_expiry ON vaccinations(batch_expires_on);
CREATE INDEX idx_vaccinations_administrator ON vaccinations(administered_by_user_id);