Sync public snapshot from freebuff-private

Source: CodebuffAI/freebuff-private@c2a1983d38883380db7cdccedfe7b9a1048c6023

Author: github-actions[bot]

bun.lock

@@ -252,7 +252,9 @@ describe('freebuff model availability', () => {
     expect(all[all.length - 1]).toBe(FREEBUFF_DEEPSEEK_V4_PRO_MODEL_ID)
     // And it is nobody's starting pick — a default has to be joinable at every
     // hour, which Pro is not.
-    expect(DEFAULT_FREEBUFF_MODEL_ID).not.toBe(FREEBUFF_DEEPSEEK_V4_PRO_MODEL_ID)
+    expect(DEFAULT_FREEBUFF_MODEL_ID).not.toBe(
+      FREEBUFF_DEEPSEEK_V4_PRO_MODEL_ID,
+    )
     expect(DEFAULT_FREEBUFF_WEB_MODEL_ID).not.toBe(
       FREEBUFF_DEEPSEEK_V4_PRO_MODEL_ID,
     )
@@ -265,7 +267,7 @@ describe('freebuff model availability', () => {
    * because the hazard is a notice being ADDED back rather than an existing one
    * being wrong — and because both notices that used to live here expired
    * without anyone noticing (each claimed V4 Flash was the better default;
-   * Flash then became premium and started closing for ten hours a day).
+   * Flash then became premium and started closing during peak hours).
    *
    * It matters more than copy: migrateSupersededFreebuffModelPreference
    * rewrites a SAVED pick on every load, so a supersedes notice silently moves
@@ -300,17 +302,6 @@ describe('freebuff model availability', () => {
     )
   })
 
-  /**
-   * The peak-hours swap, as one test because it is one decision. V4 Pro used to
-   * close 00:00-10:00 UTC and Flash stayed open; on 2026-08-21 that inverted,
-   * because Pro moved to a flat-priced lane while Flash is still served by
-   * lanes that double at peak.
-   *
-   * Asserted as a PAIR deliberately. Either row alone looks arbitrary, and the
-   * dangerous state is both closed at once — which is what a copy-paste of the
-   * old availability onto the new row would produce, closing the catalog's two
-   * strongest models for ten hours a day.
-   */
   /**
    * THE invariant, restated as what it has always really been: V4 Pro and V4
    * Flash are never closed at the same time.
@@ -343,7 +334,10 @@ describe('freebuff model availability', () => {
       isFreebuffSessionModelAvailable(FREEBUFF_DEEPSEEK_V4_PRO_MODEL_ID, peak),
     ).toBe(true)
     expect(
-      isFreebuffSessionModelAvailable(FREEBUFF_DEEPSEEK_V4_FLASH_MODEL_ID, peak),
+      isFreebuffSessionModelAvailable(
+        FREEBUFF_DEEPSEEK_V4_FLASH_MODEL_ID,
+        peak,
+      ),
     ).toBe(true)
   })
 
@@ -815,14 +809,14 @@ describe('freebuff model availability', () => {
         includeGodOnly: true,
       }),
     ).toBe(true)
-    expect(
-      isFreebuffWebGodOnlyModelId(FREEBUFF_GPT_5_6_LUNA_ES_MODEL_ID),
-    ).toBe(true)
+    expect(isFreebuffWebGodOnlyModelId(FREEBUFF_GPT_5_6_LUNA_ES_MODEL_ID)).toBe(
+      true,
+    )
     // A premium model absent from every pool lands in the unmetered Standard
     // set instead — this must be true, or it isn't in SOME pool.
-    expect(
-      isFreebuffWebPremiumModelId(FREEBUFF_GPT_5_6_LUNA_ES_MODEL_ID),
-    ).toBe(true)
+    expect(isFreebuffWebPremiumModelId(FREEBUFF_GPT_5_6_LUNA_ES_MODEL_ID)).toBe(
+      true,
+    )
     expect(FREEBUFF_STANDARD_MODEL_IDS).not.toContain(
       FREEBUFF_GPT_5_6_LUNA_ES_MODEL_ID,
     )

common/src/__tests__/freebuff-models.test.ts

@@ -63,3 +63,12 @@ describe('the expensive window', () => {
     )
   })
 })
+
+test.each(['2026-08-29T02:00:00Z', '2026-08-30T02:00:00Z'])(
+  '%s uses weekend rates in Beijing',
+  (instant) => {
+    const date = new Date(instant)
+    expect(deepseekPricingWindow(date)).toBe('off-peak')
+    expect(isDeepSeekExpensiveWindow(date)).toBe(false)
+  },
+)

common/src/__tests__/freebuff-peak-hours.test.ts

@@ -13,7 +13,8 @@
 /**
  * Peak hours, from api-docs.deepseek.com/quick_start/pricing (read 2026-08-16):
  * "Peak hours are 01:00 - 04:00 and 06:00 - 10:00 UTC (all other hours are
- * off-peak)." Every rate doubles inside them.
+ * off-peak)." These windows apply Monday-Friday Beijing time; weekends are
+ * always off-peak.
  *
  * Half-open [start, end): 04:00:00 UTC itself is already off-peak. TWO
  * disjoint windows, not one — the 04:00-06:00 gap between them is exactly what
@@ -28,6 +29,11 @@ export const DEEPSEEK_PEAK_HOUR_RANGES_UTC: ReadonlyArray<
 
 export type DeepSeekPricingWindow = 'peak' | 'off-peak'
 
+function isBeijingWeekend(at: Date): boolean {
+  const beijingDay = new Date(at.getTime() + 8 * 60 * 60 * 1000).getUTCDay()
+  return beijingDay === 0 || beijingDay === 6
+}
+
 /**
  * Which rate card applies at `at`.
  *
@@ -36,6 +42,7 @@ export type DeepSeekPricingWindow = 'peak' | 'off-peak'
  * ceiling), and a hidden `new Date()` would make both untestable.
  */
 export function deepseekPricingWindow(at: Date): DeepSeekPricingWindow {
+  if (isBeijingWeekend(at)) return 'off-peak'
   const hour = at.getUTCHours()
   const peak = DEEPSEEK_PEAK_HOUR_RANGES_UTC.some(
     ([startHour, endHour]) => hour >= startHour && hour < endHour,
@@ -58,8 +65,8 @@ export function deepseekPricingWindow(at: Date): DeepSeekPricingWindow {
 export const DEEPSEEK_EXPENSIVE_WINDOW_LEAD_HOURS = 1
 
 /**
- * The single window in which DeepSeek is at its most expensive, [start, end)
- * UTC — 00:00 to 10:00, which is 5pm to 3am Pacific.
+ * The single weekday window in which DeepSeek is at its most expensive,
+ * [start, end) UTC — 00:00 to 10:00, which is 5pm to 3am Pacific.
  *
  * DERIVED from DEEPSEEK_PEAK_HOUR_RANGES_UTC rather than written down, so it
  * cannot drift the day DeepSeek moves its hours.
@@ -79,6 +86,7 @@ export const DEEPSEEK_EXPENSIVE_WINDOW_UTC: readonly [number, number] = [
 /** Whether `at` falls in the window above. Half-open like the peak check, so
  *  the closing hour is already outside it. */
 export function isDeepSeekExpensiveWindow(at: Date): boolean {
+  if (isBeijingWeekend(at)) return false
   const [start, end] = DEEPSEEK_EXPENSIVE_WINDOW_UTC
   const hour = at.getUTCHours()
   return hour >= start && hour < end

common/src/constants/freebuff-peak-hours.ts

@@ -24,12 +24,14 @@ import {
  */
 
 /** Models a subscription's pooled allowance can be spent on. */
-export const FREEBUFF_SUBSCRIPTION_MODEL_IDS: readonly string[] = Object.freeze([
-  FREEBUFF_DEEPSEEK_V4_PRO_MODEL_ID,
-  FREEBUFF_GPT_5_6_LUNA_MODEL_ID,
-  FREEBUFF_DEEPSEEK_V4_FLASH_MODEL_ID,
-  FREEBUFF_KIMI_K3_ECO_MODEL_ID,
-])
+export const FREEBUFF_SUBSCRIPTION_MODEL_IDS: readonly string[] = Object.freeze(
+  [
+    FREEBUFF_DEEPSEEK_V4_PRO_MODEL_ID,
+    FREEBUFF_GPT_5_6_LUNA_MODEL_ID,
+    FREEBUFF_DEEPSEEK_V4_FLASH_MODEL_ID,
+    FREEBUFF_KIMI_K3_ECO_MODEL_ID,
+  ],
+)
 
 /**
  * The expensive half of the pool, sub-capped within each day.
@@ -181,7 +183,7 @@ export function freebuffSubscriptionTierDisclaimers(
     'Adds to your free sessions rather than replacing them',
   ]
   if (tier.deepseekPeakHoursExcluded) {
-    out.push('DeepSeek models are unavailable during peak hours')
+    out.push('DeepSeek models are unavailable during weekday peak hours')
   }
   return out
 }