Add DB garbage collection

main.go

@@ -171,6 +171,17 @@ func main() {
 		log.WithError(err).Error("Error while listening to module config changes")
 	}()
 
+	// Run garbage collection every once in a while
+	ticker := time.NewTicker(15 * time.Minute)
+	defer ticker.Stop()
+	for range ticker.C {
+		// Run DB garbage collection until it's done
+		var err error
+		for err == nil {
+			err = db.Client().RunValueLogGC(0.5)
+		}
+	}
+
 	// Start HTTP server
 	failOnError(httpServer.Listen(), "HTTP server stopped")
 }