Add LKGP cache exports and storage functions

src/lib/db/settings.ts

@@ -744,3 +744,30 @@ export async function resetCacheMetrics() {
   );
   return getCacheMetrics();
 }
+
+// ──────────────── Last Known Good Provider (LKGP) ────────────────
+
+export async function getLKGP(comboName: string, modelId: string): Promise<string | null> {
+  const db = getDbInstance();
+  const key = `lkgp:${comboName}:${modelId}`;
+  const row = db
+    .prepare("SELECT value FROM key_value WHERE namespace = 'lkgp' AND key = ?")
+    .get(key);
+  if (!row) return null;
+  const record = toRecord(row);
+  return typeof record.value === "string" ? record.value : null;
+}
+
+export async function setLKGP(
+  comboName: string,
+  modelId: string,
+  providerId: string
+): Promise<void> {
+  const db = getDbInstance();
+  const key = `lkgp:${comboName}:${modelId}`;
+  db.prepare("INSERT OR REPLACE INTO key_value (namespace, key, value) VALUES ('lkgp', ?, ?)").run(
+    key,
+    providerId
+  );
+  backupDbFile("pre-write");
+}

src/lib/localDb.ts

@@ -158,6 +158,8 @@ export {
   getCachedSettings,
   getCachedPricing,
   getCachedProviderConnections,
+  getCachedLKGP,
+  setCachedLKGP,
   invalidateDbCache,
 } from "./db/readCache";