fix: price data update time serialization

price update time was not properly serialized as a number like the schema was, and led to dates being stored as empty objects. UI code also did not check if date was NaN, and rendered "invalid date" instead.

src/content/priceService.ts

@@ -7,8 +7,8 @@ import { logDebug, log } from "./utils/log"
 export class ItemPriceData {
 	/** Item SKU. */
 	sku: string
-	/** Date updated. */
-	update: Date
+	/** Date updated, as Unix timestamp. */
+	update: number
 	/** TTL in milliseconds. */
 	ttl: number
 	/** Price in keys. */
@@ -19,7 +19,7 @@ export class ItemPriceData {
 	scmPrice: number
 
 	toString(): string {
-		return `Price for ${this.sku}, fetched ${this.update} (expires ${this.update.getTime() + this.ttl})\n` + 
+		return `Price for ${this.sku}, fetched ${new Date(this.update)} (expires ${new Date(this.update + this.ttl)})\n` + 
 			JSON.stringify({
 				keys: this.keys,
 				metal: this.metal,
@@ -43,8 +43,8 @@ export async function fetchPrice(token: string, sku: string, update: Date = new
 	return new Promise(async (resolve, reject) => {
 		var data: ItemPriceData | null
 
-		const cached = await getStorageValue(storage_priceprefix + sku, null)
-		if (cached != null && 'keys' in cached && 'metal' in cached) {
+		const cached: ItemPriceData = await getStorageValue(storage_priceprefix + sku, null)
+		if (cached != null && 'keys' in cached && 'metal' in cached && !isNaN(cached.update)) {
 			data = cached
 		}
 
@@ -55,7 +55,7 @@ export async function fetchPrice(token: string, sku: string, update: Date = new
 			}
 			data = new ItemPriceData()
 			data.sku = sku
-			data.update = update
+			data.update = update.getTime()
 			data.ttl = ttl
 
 			try {