fix(codex): raise default quota threshold from 90% to 99% to avoid premature account blocking (#1697)

The previous 90% default treated Codex accounts as unavailable while they
still had ~10% quota remaining. A 99% threshold reserves only a minimal
safety margin near true exhaustion while preserving usable quota.

- Export DEFAULT_QUOTA_THRESHOLD_PERCENT=99 from quotaCache.ts
- Replace CODEX_QUOTA_THRESHOLD_PERCENT in auth.ts with shared constant
- Update quota policy tests to match new default

Co-authored-by: dhaern <manker_lol@hotmail.com>

src/domain/quotaCache.ts

@@ -49,6 +49,7 @@ const ACTIVE_TTL_MS = 5 * 60 * 1000; // 5 minutes for active accounts
 const EXHAUSTED_TTL_MS = 5 * 60 * 1000; // 5 minutes for 429-sourced entries (no resetAt)
 const EXHAUSTED_REFRESH_MS = 5 * 60 * 1000; // 5 minutes: recheck exhausted accounts (aligned with TTL)
 const REFRESH_INTERVAL_MS = 60 * 1000; // Background tick every 1 minute
+export const DEFAULT_QUOTA_THRESHOLD_PERCENT = 99;
 
 // ─── State ──────────────────────────────────────────────────────────────────
 
@@ -260,7 +261,7 @@ export function isAccountQuotaExhausted(connectionId: string): boolean {
 export function getQuotaWindowStatus(
   connectionId: string,
   windowName: string,
-  thresholdPercent = 90
+  thresholdPercent = DEFAULT_QUOTA_THRESHOLD_PERCENT
 ): QuotaWindowStatus | null {
   const entry = cache.get(connectionId);
   if (!entry) return null;

src/sse/services/auth.ts

@@ -6,7 +6,12 @@ import {
   getSettings,
   getCachedSettings,
 } from "@/lib/localDb";
-import { getQuotaCache, getQuotaWindowStatus, isAccountQuotaExhausted } from "@/domain/quotaCache";
+import {
+  DEFAULT_QUOTA_THRESHOLD_PERCENT,
+  getQuotaCache,
+  getQuotaWindowStatus,
+  isAccountQuotaExhausted,
+} from "@/domain/quotaCache";
 import {
   isAccountUnavailable,
   getUnavailableUntil,
@@ -82,7 +87,6 @@ interface CooldownInspectionState {
   retryableModelCooldownMs: number | null;
 }
 
-const CODEX_QUOTA_THRESHOLD_PERCENT = 90;
 const MIN_QUOTA_THRESHOLD_PERCENT = 1;
 const MAX_QUOTA_THRESHOLD_PERCENT = 100;
 const NON_RETRYABLE_MODEL_LOCKOUT_REASONS = new Set(["not_found", "not_found_local"]);
@@ -168,7 +172,10 @@ interface QuotaCacheView {
   >;
 }
 
-function normalizeQuotaThreshold(value: unknown, fallback = CODEX_QUOTA_THRESHOLD_PERCENT): number {
+function normalizeQuotaThreshold(
+  value: unknown,
+  fallback = DEFAULT_QUOTA_THRESHOLD_PERCENT
+): number {
   const parsed = toNumber(value, fallback);
   return Math.min(MAX_QUOTA_THRESHOLD_PERCENT, Math.max(MIN_QUOTA_THRESHOLD_PERCENT, parsed));
 }

tests/unit/quota-policy-generalization.test.ts

@@ -18,7 +18,7 @@ test("resolveQuotaLimitPolicy keeps codex legacy defaults when generic policy is
 
   assert.equal(policy.enabled, true);
   assert.deepEqual(policy.windows, ["session"]);
-  assert.equal(policy.thresholdPercent, 90);
+  assert.equal(policy.thresholdPercent, 99);
 });
 
 test("resolveQuotaLimitPolicy enforces codex weekly window when weekly toggle is enabled", () => {

tests/unit/sse-auth.test.ts

@@ -264,7 +264,7 @@ test("resolveQuotaLimitPolicy normalizes Codex windows, thresholds, and defaults
   });
   assert.deepEqual(defaults, {
     enabled: true,
-    thresholdPercent: 90,
+    thresholdPercent: 99,
     windows: ["session", "weekly"],
   });
   assert.deepEqual(generic, {