fix(store,openai): bound dashboard concurrency and restore quota state re-read

Split the dashboard summary into two three-way query batches so one render holds at most three pool connections and cannot starve data-plane writes under the five-second acquire timeout. Restore the fresh account read before the passive-quota availability write-back: the revision fence only covers credential rotation, so deciding transitions from the selection-time snapshot could overwrite availability changes made by other paths and delay exhausted-account recovery. Drop the redundant admin_audit_events retention index (the initial created_at index already serves the delete predicate) and document the rolling-deploy indexing procedure in the migration.

Co-authored-by: Claude <noreply@anthropic.com>

backend/crates/gateway-core/src/engine/mod.rs

@@ -598,6 +598,9 @@ pub trait ExecutionStore: Send + Sync {
     async fn record_attempt(&self, attempt: AttemptRecord) -> Result<(), StoreError>;
     /// 请求插入与首次 attempt 合并持久化；两者写同一行，支持合并写的
     /// store 可覆写为单次往返，缩短首 token 前的关键路径。
+    ///
+    /// 覆写实现应保证原子性：默认的两步实现里第二步失败会留下一条
+    /// `running` 请求行，由 deadline 回收器收敛。
     async fn create_model_request_with_attempt(
         &self,
         request: NewModelRequest,

backend/crates/gateway-store/src/postgres/observability.rs

@@ -776,11 +776,14 @@ impl ObservabilityRepository for PgObservabilityRepository {
             page: ObservabilityPageNumber::new(1)?,
             page_size: ObservabilityPageSize::new(10)?,
         };
-        // 六路独立查询并发执行；页面延迟由最慢一路决定而非各路之和。
-        let (requests, attempts, provider_accounts, trend, account_usage, recent_requests) = futures::try_join!(
+        // 分两批并发：页面延迟从六路之和降为两批各自最慢者之和，同时单次
+        // 渲染最多占用 3 个池连接，不与数据面写路径争抢整个连接池。
+        let (requests, attempts, provider_accounts) = futures::try_join!(
             request_metrics(&self.pool, range, &filter),
             attempt_metrics(&self.pool, range, &filter),
             provider_account_metrics(&self.pool, range.end),
+        )?;
+        let (trend, account_usage, recent_requests) = futures::try_join!(
             request_metric_series(&self.pool, range, &filter),
             provider_account_usage(&self.pool, account_usage_query),
             async { Ok(list_usage_records(&self.pool, recent_query).await?.items) },

backend/crates/providers/openai/src/credential/quota.rs

@@ -658,20 +658,25 @@ impl CodexCredentialQuotaService {
         if outcome == QuotaWriteOutcome::Conflict {
             return Ok(false);
         }
-        // quota CAS 以 account.revision 为 fence，成功即证明该 revision 在写入时
-        // 仍是当前凭据；后续状态写回带同一 fence，轮换竞态下安全失败。
-        // 可用性判断使用选择时的账号快照，偏差在下一次响应或 quota 轮询收敛。
+        // 可用性写回必须基于最新账号状态：revision fence 只覆盖凭据轮换，
+        // 不覆盖其他路径的仅状态变化（Cooldown/QuotaExhausted 转换）。
+        let Some(current) = self.store.get_account(account.id()).await? else {
+            return Ok(false);
+        };
+        if current.revision() != account.revision() {
+            return Ok(false);
+        }
         self.scheduling
-            .observe(account.id().clone(), account.revision(), observed_at, fact);
+            .observe(current.id().clone(), current.revision(), observed_at, fact);
         if let Some(availability) = quota_success_availability(
-            account.availability(),
-            account.cooldown_until(),
+            current.availability(),
+            current.cooldown_until(),
             fact.exhausted(),
             observed_at,
         ) {
             self.repository
                 .apply_state(
-                    account,
+                    &current,
                     availability,
                     fact.exhausted().then_some("quota_exhausted".to_owned()),
                     None,

backend/migrations/0002_retention_delete_indexes.sql

@@ -1,5 +1,10 @@
 -- 保留期清理的删除谓词索引：清理任务按终态时间批量删除，
--- 无索引时每轮都会全表扫描三张审计/用量表。
+-- 无索引时每轮都会全表扫描。admin_audit_events 已有 (created_at desc, id desc)
+-- 索引覆盖其删除谓词，不再重复建。
+--
+-- 索引在启动迁移事务内构建，期间对目标表持 SHARE 锁（挡写不挡读）。
+-- 单实例部署在 serve 之前执行，无并发写；多实例滚动部署应在升级前
+-- 手动 `create index concurrently` 预建同名索引，本迁移随后幂等跳过。
 
 create index if not exists idx_model_requests_retention
     on model_requests (completed_at)
@@ -8,6 +13,3 @@ create index if not exists idx_model_requests_retention
 create index if not exists idx_ops_events_retention
     on ops_events (created_at)
     where model_request_id is null;
-
-create index if not exists idx_admin_audit_events_retention
-    on admin_audit_events (created_at);