fix(rectification): 请求内 Case 档案只读投影写即失效缓存

同一请求里 dossier/compute 按 (fn, userId, caseId) 合并重复读，其它 RPC 与 .from 立即失效。路由入口各包一处，零调用点改动。

frontend/src/app/api/rectification/agent/route.ts

@@ -30,6 +30,7 @@ import { isProductEnabled } from "@/lib/product-access";
 import { resolveSessionLanguageModel } from "@/lib/model-catalog";
 import { jsonForSupabaseSetupFailure } from "@/lib/api/service-unavailable";
 import { createAdminSupabaseClient } from "@/lib/supabase/admin";
+import { withRectificationRequestCache } from "@/lib/rectification-agentic/v9/request-cache";
 import { createServerSupabaseClient } from "@/lib/supabase/server";
 import { defaultMessageOrigin, isRectificationMessageOrigin } from "@/lib/rectification-agentic/v9/message-origin";
 import { previousInferenceFromReceipt } from "@/lib/rectification-agentic/v9/inference-adapter";
@@ -150,7 +151,7 @@ export async function POST(request: Request) {
   let accounting;
   try {
     supabase = await createServerSupabaseClient();
-    accounting = createAdminSupabaseClient();
+    accounting = withRectificationRequestCache(createAdminSupabaseClient());
   } catch (error) {
     return jsonForSupabaseSetupFailure(error, "POST /api/rectification/agent");
   }

frontend/src/app/api/rectification/cases/[caseId]/candidates/accept/route.ts

@@ -2,6 +2,7 @@ import { NextResponse } from "next/server";
 import { z } from "zod";
 import { jsonForSupabaseSetupFailure } from "@/lib/api/service-unavailable";
 import { createAdminSupabaseClient } from "@/lib/supabase/admin";
+import { withRectificationRequestCache } from "@/lib/rectification-agentic/v9/request-cache";
 import { isProductEnabled } from "@/lib/product-access";
 import { createServerSupabaseClient } from "@/lib/supabase/server";
 import { RectificationToolServiceError } from "@/lib/rectification-agentic/v9/tool-service";
@@ -59,7 +60,7 @@ export async function POST(request: Request, context: RouteContext) {
   let accounting;
   try {
     supabase = await createServerSupabaseClient();
-    accounting = createAdminSupabaseClient();
+    accounting = withRectificationRequestCache(createAdminSupabaseClient());
   } catch (error) {
     return jsonForSupabaseSetupFailure(error, "POST /api/rectification/cases/[caseId]/candidates/accept");
   }

frontend/src/app/api/rectification/cases/[caseId]/repair-exit/route.ts

@@ -2,6 +2,7 @@ import { NextResponse } from "next/server";
 import { z } from "zod";
 import { jsonForSupabaseSetupFailure } from "@/lib/api/service-unavailable";
 import { createAdminSupabaseClient } from "@/lib/supabase/admin";
+import { withRectificationRequestCache } from "@/lib/rectification-agentic/v9/request-cache";
 import { createServerSupabaseClient } from "@/lib/supabase/server";
 import {
   loadV9CaseDossier,
@@ -32,7 +33,7 @@ export async function POST(request: Request, context: RouteContext) {
   let accounting;
   try {
     supabase = await createServerSupabaseClient();
-    accounting = createAdminSupabaseClient();
+    accounting = withRectificationRequestCache(createAdminSupabaseClient());
   } catch (error) {
     return jsonForSupabaseSetupFailure(error, "POST /api/rectification/cases/[caseId]/repair-exit");
   }

frontend/src/app/api/rectification/cases/[caseId]/route.ts

@@ -2,6 +2,7 @@ import { NextResponse } from "next/server";
 import { z } from "zod";
 import { jsonForSupabaseSetupFailure } from "@/lib/api/service-unavailable";
 import { createAdminSupabaseClient } from "@/lib/supabase/admin";
+import { withRectificationRequestCache } from "@/lib/rectification-agentic/v9/request-cache";
 import { createServerSupabaseClient } from "@/lib/supabase/server";
 import {
   loadV9CaseDossier,
@@ -29,7 +30,7 @@ export async function GET(request: Request, context: RouteContext) {
   let accounting;
   try {
     supabase = await createServerSupabaseClient();
-    accounting = createAdminSupabaseClient();
+    accounting = withRectificationRequestCache(createAdminSupabaseClient());
   } catch (error) {
     return jsonForSupabaseSetupFailure(error, "GET /api/rectification/cases/[caseId]");
   }

frontend/src/app/api/rectification/cases/[caseId]/turns/[turnId]/regenerate/route.ts

@@ -9,6 +9,7 @@ import { resolveExactSkillPackage } from "@/lib/skill-package-registry";
 import { resolveSessionLanguageModel } from "@/lib/model-catalog";
 import { jsonForSupabaseSetupFailure } from "@/lib/api/service-unavailable";
 import { createAdminSupabaseClient } from "@/lib/supabase/admin";
+import { withRectificationRequestCache } from "@/lib/rectification-agentic/v9/request-cache";
 import { createServerSupabaseClient } from "@/lib/supabase/server";
 import { getRectificationV9RegenerationAgent } from "@/mastra/agentic-rectification";
 import { logRectificationDeliveryTurn } from "@/lib/rectification-agentic/v9/delivery-turn-guard";
@@ -64,7 +65,7 @@ export async function POST(request: Request, context: RouteContext) {
   let accounting;
   try {
     supabase = await createServerSupabaseClient();
-    accounting = createAdminSupabaseClient();
+    accounting = withRectificationRequestCache(createAdminSupabaseClient());
   } catch (error) {
     return jsonForSupabaseSetupFailure(error, "POST /api/rectification/cases/[caseId]/turns/[turnId]/regenerate");
   }

frontend/src/lib/rectification-agentic/v9/request-cache.ts

@@ -0,0 +1,76 @@
+/**
+ * Request-scoped cache for Case read projections.
+ *
+ * `get_agentic_rectification_case_dossier` and
+ * `get_agentic_rectification_case_compute` are unchanged for the life of a
+ * request until this client performs any other RPC or table access. Call sites
+ * keep calling `loadV9CaseDossier` as before; the wrapper sits on the client
+ * object so direct `accounting.rpc(...)` paths are covered too.
+ *
+ * The cache is a closure over a Map created by each `withRectificationRequestCache`
+ * call. It is not stored on `globalThis` or at module scope.
+ *
+ * Other properties are forwarded through a Proxy so `.from(table).update(...)`
+ * (used via `as never` in a few call sites) still works, and accessing them
+ * invalidates the same way a non-projection RPC does.
+ */
+import type { RectificationRpcClient } from "./tool-service";
+
+export const RECTIFICATION_CACHED_PROJECTION_RPCS = [
+  "get_agentic_rectification_case_dossier",
+  "get_agentic_rectification_case_compute",
+] as const;
+
+type CachedProjectionRpc = (typeof RECTIFICATION_CACHED_PROJECTION_RPCS)[number];
+
+const cachedProjectionRpcSet = new Set<string>(RECTIFICATION_CACHED_PROJECTION_RPCS);
+
+function isCachedProjectionRpc(fn: string): fn is CachedProjectionRpc {
+  return cachedProjectionRpcSet.has(fn);
+}
+
+function projectionCacheKey(fn: string, args: Record<string, unknown>): string | null {
+  const userId = args.p_user_id;
+  const caseId = args.p_case_id;
+  if (typeof userId !== "string" || typeof caseId !== "string" || !userId || !caseId) {
+    return null;
+  }
+  return `${fn}\0${userId}\0${caseId}`;
+}
+
+type RpcResult = Awaited<ReturnType<RectificationRpcClient["rpc"]>>;
+
+export function withRectificationRequestCache<T extends RectificationRpcClient>(accounting: T): T {
+  const cache = new Map<string, PromiseLike<RpcResult>>();
+  const originalRpc = accounting.rpc.bind(accounting);
+
+  function invalidate(): void {
+    cache.clear();
+  }
+
+  function cachedRpc(fn: string, args: Record<string, unknown>): PromiseLike<RpcResult> {
+    if (!isCachedProjectionRpc(fn)) {
+      invalidate();
+      return originalRpc(fn, args);
+    }
+    const key = projectionCacheKey(fn, args);
+    if (!key) return originalRpc(fn, args);
+    const hit = cache.get(key);
+    if (hit) return hit;
+    const pending = originalRpc(fn, args);
+    cache.set(key, pending);
+    return pending;
+  }
+
+  return new Proxy(accounting, {
+    get(target, property) {
+      if (property === "rpc") return cachedRpc;
+      invalidate();
+      const value = Reflect.get(target, property);
+      if (typeof value === "function") {
+        return value.bind(target);
+      }
+      return value;
+    },
+  }) as T;
+}