fix: infer source fetch metrics

apis/utils/fetch.mjs

@@ -10,6 +10,44 @@ const fetchMetrics = {
   recent: [],
 };
 
+const SOURCE_BY_HOST = [
+  [/api\.bls\.gov$/i, 'BLS'],
+  [/api\.fred\.stlouisfed\.org$/i, 'FRED'],
+  [/api\.eia\.gov$/i, 'EIA'],
+  [/api\.gdeltproject\.org$/i, 'GDELT'],
+  [/api\.weather\.gov$/i, 'NOAA'],
+  [/api\.open-notify\.org$/i, 'OpenNotify'],
+  [/opensky-network\.org$/i, 'OpenSky'],
+  [/firms\.modaps\.eosdis\.nasa\.gov$/i, 'FIRMS'],
+  [/api\.acleddata\.com$/i, 'ACLED'],
+  [/api\.reliefweb\.int$/i, 'ReliefWeb'],
+  [/receiverbook\.de$/i, 'KiwiSDR'],
+  [/safecast\.org$/i, 'Safecast'],
+  [/api\.patentsview\.org$/i, 'PatentsView'],
+  [/api\.trade\.gov$/i, 'Comtrade'],
+  [/api\.usaspending\.gov$/i, 'USASpending'],
+  [/api\.telegram\.org$/i, 'Telegram'],
+  [/oauth\.reddit\.com$/i, 'Reddit'],
+  [/reddit\.com$/i, 'Reddit'],
+  [/api\.bsky\.app$/i, 'Bluesky'],
+  [/api\.yahoo\.com$/i, 'YahooFinance'],
+  [/query\d?\.finance\.yahoo\.com$/i, 'YahooFinance'],
+  [/api\.cloudflare\.com$/i, 'CloudflareRadar'],
+  [/api\.opensanctions\.org$/i, 'OpenSanctions'],
+  [/home\.treasury\.gov$/i, 'Treasury'],
+  [/fiscaldata\.treasury\.gov$/i, 'Treasury'],
+  [/who\.int$/i, 'WHO'],
+];
+
+export function inferFetchSource(url) {
+  let host = 'unknown';
+  try { host = new URL(url).host.toLowerCase(); } catch { return 'unknown'; }
+  for (const [pattern, source] of SOURCE_BY_HOST) {
+    if (pattern.test(host)) return source;
+  }
+  return host;
+}
+
 function metricBucket(map, key) {
   if (!map[key]) map[key] = { requests: 0, ok: 0, failed: 0, bytes: 0, lastStatus: null, lastError: null, lastMs: 0 };
   return map[key];
@@ -38,7 +76,7 @@ export function getFetchMetrics() {
 }
 
 export async function safeFetch(url, opts = {}) {
-  const { timeout = 15000, retries = 1, headers = {}, source = undefined } = opts;
+  const { timeout = 15000, retries = 1, headers = {}, source = inferFetchSource(url) } = opts;
   let lastError;
   for (let i = 0; i <= retries; i++) {
     const started = Date.now();
@@ -71,11 +109,11 @@ export async function safeFetch(url, opts = {}) {
       if (i < retries) await new Promise(r => setTimeout(r, 2000 * (i + 1)));
     }
   }
-  return { error: lastError?.message || 'Unknown error', source: url };
+  return { error: lastError?.message || 'Unknown error', source };
 }
 
 export async function safeFetchText(url, opts = {}) {
-  const { timeout = 15000, retries = 1, headers = {}, source = undefined } = opts;
+  const { timeout = 15000, retries = 1, headers = {}, source = inferFetchSource(url) } = opts;
   let lastError;
   for (let i = 0; i <= retries; i++) {
     const started = Date.now();