api for health score toggle

main.go

@@ -176,6 +176,26 @@ func main() {
 		log.Println("⚠️  could not add products.cataloguefacts, catalogue detail will not survive a re-scrape:", err)
 	}
 
+	// Whether this shop shows a health score for this product.
+	//
+	// The shopkeeper's call, not ours. The score comes from a third party that
+	// matches a reference product by name — often at under 60% confidence — so a
+	// merchant who knows the packet in front of them may reasonably decide the
+	// rating does not describe what they are selling, and should be able to take
+	// it off their own shelf without taking it off everybody's.
+	//
+	// DEFAULT TRUE, so every product already imported keeps showing exactly what
+	// it shows today. A new column defaulting to false would silently strip the
+	// health score from every shelf on the platform, which is a change nobody
+	// asked for dressed up as a migration.
+	//
+	// Only the score. `nutrition` is unaffected and always sent: the figures are
+	// what the packet says, while the score is somebody's judgement of them.
+	if err := db.DB.Exec(
+		`ALTER TABLE products ADD COLUMN IF NOT EXISTS showhealthscore boolean NOT NULL DEFAULT true`).Error; err != nil {
+		log.Println("⚠️  could not add products.showhealthscore, every product will keep showing its health score:", err)
+	}
+
 	// When a product became visible to a store, and the only thing that decides
 	// whether it is.
 	//