feat(resilience): default the credential health check sweep to 60 minutes (#12138)

Validado em worktree combinada com typecheck limpo, testes focados verdes, gates de file-size/complexity/cognitive-complexity/cycles OK. Obrigado!

src/lib/credentialHealth/scheduler.ts

@@ -129,7 +129,7 @@ export function resolveCredentialHealthSweepInterval(
     const parsed = parseInt(envVal, 10);
     if (!isNaN(parsed) && parsed >= 10_000) return parsed;
   }
-  return 300_000; // default 5 min
+  return 3_600_000; // default 60 min
 }
 
 /**
@@ -142,7 +142,7 @@ function getSweepInterval(): number {
     const parsed = parseInt(envVal, 10);
     if (!isNaN(parsed) && parsed >= 10_000) return parsed;
   }
-  return 300_000; // default 5 min
+  return 3_600_000; // default 60 min
 }
 
 /**

src/lib/resilience/settings.ts

@@ -184,10 +184,11 @@ export const DEFAULT_RESILIENCE_SETTINGS: ResilienceSettings = {
   // default until an operator adds an override here.
   providerQuotaOverrides: {},
   // Global default cadence for the background credential health check sweep.
-  // 5 minutes preserves the pre-setting scheduler default (300 000 ms);
-  // 0 disables the sweep entirely. Per-connection overrides always win.
+  // 60 minutes: the sweep makes a real upstream probe against EVERY active
+  // connection, so the previous 5-minute default cost 12 requests/hour per
+  // connection. 0 disables the sweep entirely. Per-connection overrides win.
   credentialHealthCheck: {
-    intervalMinutes: 5,
+    intervalMinutes: 60,
   },
 };
 

tests/unit/credential-health-sweep-interval.test.ts

@@ -20,13 +20,13 @@ function withEnv(value: string | undefined, fn: () => void) {
   }
 }
 
-test("default resilience settings include a 5-minute credential health check cadence", () => {
-  assert.equal(DEFAULT_RESILIENCE_SETTINGS.credentialHealthCheck.intervalMinutes, 5);
+test("default resilience settings include a 60-minute credential health check cadence", () => {
+  assert.equal(DEFAULT_RESILIENCE_SETTINGS.credentialHealthCheck.intervalMinutes, 60);
 });
 
 test("resolveResilienceSettings returns the default interval when nothing is stored", () => {
   const resolved = resolveResilienceSettings({});
-  assert.equal(resolved.credentialHealthCheck.intervalMinutes, 5);
+  assert.equal(resolved.credentialHealthCheck.intervalMinutes, 60);
 });
 
 test("mergeResilienceSettings stores an operator interval and preserves other sections", () => {
@@ -45,9 +45,9 @@ test("mergeResilienceSettings clamps the interval into the 0-1440 band", () => {
   assert.equal(high.credentialHealthCheck.intervalMinutes, 1440);
 });
 
-test("sweep interval: no operator setting and no env → built-in 5 min default", () => {
+test("sweep interval: no operator setting and no env → built-in 60 min default", () => {
   withEnv(undefined, () => {
-    assert.equal(resolveCredentialHealthSweepInterval({}), 300_000);
+    assert.equal(resolveCredentialHealthSweepInterval({}), 60 * 60_000);
   });
 });
 
@@ -87,6 +87,6 @@ test("sweep interval: non-numeric stored interval falls back to env/default", ()
     const settings = {
       resilienceSettings: { credentialHealthCheck: { intervalMinutes: "abc" } },
     };
-    assert.equal(resolveCredentialHealthSweepInterval(settings), 300_000);
+    assert.equal(resolveCredentialHealthSweepInterval(settings), 60 * 60_000);
   });
 });