diff --git a/apps/server/src/modules/auth-settings/provided.ts b/apps/server/src/modules/auth-settings/provided.ts
index 743c407c..430be9d9 100644
--- a/apps/server/src/modules/auth-settings/provided.ts
+++ b/apps/server/src/modules/auth-settings/provided.ts
@@ -1,5 +1,11 @@
 import { createCipheriv, createDecipheriv, createHmac, randomBytes, randomUUID } from "node:crypto";
-import { DEFAULT_SETTINGS, GlobalSettings, type SecretPurpose, type SettingsKey } from "@umt/contracts";
+import {
+  DEFAULT_SETTINGS,
+  GlobalSettings,
+  type SecretPurpose,
+  type SettingsKey,
+  withStorageDefaults,
+} from "@umt/contracts";
 import type { DB, Kysely } from "@umt/db";
 import type { Logger } from "pino";
 import type { EventBusPort } from "../../http/sse.ts";
@@ -335,7 +341,13 @@ export function createSettingsReader(deps: {
     for (const key of Object.keys(DEFAULT_SETTINGS) as SettingsKey[]) {
       const def = DEFAULT_SETTINGS[key];
       const v = stored.get(key);
-      const merged = v && typeof v === "object" && !Array.isArray(v) ? { ...def, ...(v as object) } : def;
+      // storage 是两层结构:逐层补缺省,旧库里缺子字段也能整体通过校验
+      const merged =
+        key === "storage"
+          ? withStorageDefaults(v)
+          : v && typeof v === "object" && !Array.isArray(v)
+            ? { ...def, ...(v as object) }
+            : def;
       const parsed = GlobalSettings.shape[key].safeParse(merged);
       if (!parsed.success) deps.logger.warn({ key }, "settings 值不合法，回退缺省");
       out[key] = parsed.success ? parsed.data : def;
diff --git a/apps/server/src/modules/cache/images.ts b/apps/server/src/modules/cache/images.ts
index d3219010..dcd961b9 100644
--- a/apps/server/src/modules/cache/images.ts
+++ b/apps/server/src/modules/cache/images.ts
@@ -9,6 +9,8 @@ import { TMDB_IMAGE_SIZES } from "@umt/contracts";
 // - 读缓存只在 use_cache(GLOBAL_IMAGE_CACHE)开启时;拉到的合法图片总是写盘(与 MP 一致);
 // - 合法图片按内容识别 MIME,拒绝非图片与 SVG;ETag = md5(内容),Cache-Control: public, max-age=7 天,If-None-Match 相同回 304;
 // - 清理:删除 mtime 早于 GLOBAL_IMAGE_CACHE_DAYS 天的文件与空目录(MP clear_temp → SystemUtils.clear)。
+// - CACHE-2 容量 LRU(我们加的):读盘命中时把 atime 显式写成当前时间(不依赖挂载的 relatime),
+//   超过 storage.budgets.imagesGb 时按 atime 从旧到新删到预算的 90%;按天清理保留作兜底。
 // 我们只代理 TMDB 图片域(MP SECURITY_IMAGE_DOMAINS 的 TMDB 项),上游失败回 502。
 
 export const TMDB_IMAGE_HOST = "image.tmdb.org";
@@ -51,6 +53,13 @@ export function imageMimeType(b: Uint8Array): string | null {
   return null;
 }
 
+interface ImageFile {
+  path: string;
+  size: number;
+  mtimeMs: number;
+  atimeMs: number;
+}
+
 export interface ImageCacheOptions {
   /** DATA_DIR/cache/images */
   dir: string;
@@ -104,7 +113,10 @@ export class ImageCache {
     if (useCache) {
       const cached = await fs.readFile(path).catch(() => null);
       const mime = cached?.length ? imageMimeType(cached) : null;
-      if (cached && mime) return { content: cached, mime };
+      if (cached && mime) {
+        void this.touch(path);
+        return { content: cached, mime };
+      }
     }
     let res: Response;
     try {
@@ -130,8 +142,18 @@ export class ImageCache {
     return { content, mime };
   }
 
-  private async files(): Promise<{ path: string; size: number; mtimeMs: number }[]> {
-    const out: { path: string; size: number; mtimeMs: number }[] = [];
+  /** 记一次访问:atime = 现在,mtime 不变(按天清理仍按写入时间) */
+  private async touch(path: string): Promise<void> {
+    try {
+      const st = await fs.stat(path);
+      await fs.utimes(path, new Date(), st.mtime);
+    } catch {
+      // 文件刚被清理等:忽略
+    }
+  }
+
+  private async files(): Promise<ImageFile[]> {
+    const out: ImageFile[] = [];
     const walk = async (d: string) => {
       let names: string[];
       try {
@@ -144,7 +166,7 @@ export class ImageCache {
         const st = await fs.stat(p).catch(() => null);
         if (!st) continue;
         if (st.isDirectory()) await walk(p);
-        else out.push({ path: p, size: st.size, mtimeMs: st.mtimeMs });
+        else if (!n.endsWith(".tmp")) out.push({ path: p, size: st.size, mtimeMs: st.mtimeMs, atimeMs: st.atimeMs });
       }
     };
     await walk(this.opts.dir);
@@ -156,6 +178,31 @@ export class ImageCache {
     return { bytes: f.reduce((a, x) => a + x.size, 0), files: f.length };
   }
 
+  /**
+   * 容量 LRU:总量超过 maxBytes 时按最近访问(atime)从旧到新删除,直到不超过 maxBytes × lowWater;
+   * 没超不动。返回删除数、释放字节与清理后用量。
+   */
+  async enforceBudget(
+    maxBytes: number,
+    lowWater = 0.9,
+  ): Promise<{ deleted: number; freedBytes: number; usedBytes: number }> {
+    const files = await this.files();
+    let used = files.reduce((a, f) => a + f.size, 0);
+    if (used <= maxBytes) return { deleted: 0, freedBytes: 0, usedBytes: used };
+    const target = Math.floor(maxBytes * lowWater);
+    files.sort((a, b) => a.atimeMs - b.atimeMs || a.mtimeMs - b.mtimeMs);
+    let deleted = 0;
+    let freed = 0;
+    for (const f of files) {
+      if (used <= target) break;
+      await fs.rm(f.path, { force: true });
+      used -= f.size;
+      freed += f.size;
+      deleted++;
+    }
+    return { deleted, freedBytes: freed, usedBytes: used };
+  }
+
   /** SystemUtils.clear(images, days):删 mtime 早于 days 天的文件,再删空目录;返回删除数 */
   async clean(days: number, now = Date.now()): Promise<number> {
     let deleted = 0;
diff --git a/apps/server/src/modules/cache/index.ts b/apps/server/src/modules/cache/index.ts
index 59233861..dd0b53d8 100644
--- a/apps/server/src/modules/cache/index.ts
+++ b/apps/server/src/modules/cache/index.ts
@@ -12,7 +12,7 @@ import type { z } from "zod";
 import { dataPaths } from "../../config.ts";
 import { requireScope } from "../../http/auth.ts";
 import { errorBody } from "../../http/errors.ts";
-import { CACHE_REGIONS, sharedCache, tmdbCachePolicy } from "../../shared-cache.ts";
+import { CACHE_REGIONS, sharedCache, storageSettings, tmdbCachePolicy } from "../../shared-cache.ts";
 import { registerScheduledJob } from "../schedules/registry.ts";
 import type { ModuleApp, ServerContext, ServerModule } from "../types.ts";
 import { ImageCache, ImageProxyError } from "./images.ts";
@@ -22,7 +22,8 @@ import { ImageCache, ImageProxyError } from "./images.ts";
  * - PG 缓存 kv_cache(UNLOGGED,移植 MP TTLCache)的过期行物理清理任务 cache.sweep(每 10 分钟);
  * - TMDB 缓存管理(对照 MP tmdb_cache_items / tmdb_cache_clear):GET /cache/tmdb、POST /cache/tmdb/clear;
  * - 图片代理 GET /img/tmdb/{size}/{file}(会话或 API Key read,移植 MP ImageHelper / fetch_image)+ DATA_DIR/cache/images 落盘,
- *   用量 / 清空 GET /cache/images、POST /cache/images/clear,按保留天数清理的任务 cache.images_clean(每天)。
+ *   用量 / 清空 GET /cache/images、POST /cache/images/clear,按保留天数清理的任务 cache.images_clean(每天);
+ * - CACHE-2:图片缓存容量 LRU 任务 cache.images_lru(30 分钟,预算 storage.budgets.imagesGb,超出删最久未访问)。
  */
 export interface CacheModuleOptions {
   /** 图片上游 fetch(测试注入) */
@@ -203,6 +204,26 @@ export function createCacheModule(opts: CacheModuleOptions = {}): ServerModule &
           return { summary: `删除 ${n} 张过期图片` };
         },
       });
+      registerScheduledJob(ctx, {
+        key: "cache.images_lru",
+        defaults: {
+          name: "图片缓存容量控制",
+          description: "图片代理缓存超过容量预算（存储设置，缺省 20 GB）时，按最久未访问删除到预算的 90%",
+          group: "maintain",
+          schedule: { type: "interval", everyMs: 30 * 60_000 },
+          firstRun: "after_interval",
+        },
+        run: async () => {
+          const { imagesGb } = (await storageSettings(ctx)).budgets;
+          const r = await images(ctx).enforceBudget(Math.round(imagesGb * 1024 ** 3));
+          const gb = (b: number) => `${Math.round((b / 1024 ** 3) * 100) / 100} GB`;
+          return {
+            summary: r.deleted
+              ? `删除 ${r.deleted} 张最久未访问的图片，释放 ${gb(r.freedBytes)}，现用 ${gb(r.usedBytes)}`
+              : `现用 ${gb(r.usedBytes)}，未超过预算 ${imagesGb} GB`,
+          };
+        },
+      });
     },
   };
 }
diff --git a/apps/server/src/modules/sources-identity/runtime.ts b/apps/server/src/modules/sources-identity/runtime.ts
index 2e66eed9..917afda7 100644
--- a/apps/server/src/modules/sources-identity/runtime.ts
+++ b/apps/server/src/modules/sources-identity/runtime.ts
@@ -15,7 +15,14 @@ import {
 } from "@umt/adapters";
 import { DEFAULT_SETTINGS, type SitesSettings } from "@umt/contracts";
 import { pgTokenBucketFor, type SiteRow, sql } from "@umt/db";
-import { CACHE_REGIONS, sharedCache, type TmdbCachePolicy, tmdbCachePolicy } from "../../shared-cache.ts";
+import {
+  CACHE_REGIONS,
+  renewTrackedTmdbDetail,
+  sharedCache,
+  type TmdbCachePolicy,
+  tmdbCachePolicy,
+  tmdbDetailRef,
+} from "../../shared-cache.ts";
 import type { ServerContext } from "../types.ts";
 
 // 模块运行时依赖:站点适配器与限流器(每站一个实例,令牌在 PG 跨进程共享)、RSS 抓取器、TMDB 客户端、时钟。
@@ -108,7 +115,11 @@ export class SourcesRuntime {
             ...(baseUrl ? { baseUrl } : {}),
             ...(this.overrides.fetch ? { fetch: this.overrides.fetch } : {}),
             // 请求响应进 PG 缓存(region tmdb.request),三进程共享;TTL / 条数上限 / 空结果短 TTL 取设置(对照 MP)
-            cache: { ttlMs: policy.ttl * 1000, emptyTtlMs: policy.emptyTtl * 1000 },
+            cache: {
+              ttlMs: policy.ttl * 1000,
+              searchTtlMs: policy.searchTtl * 1000,
+              emptyTtlMs: policy.emptyTtl * 1000,
+            },
             sharedCache: tmdbSharedCache(this.ctx, policy),
           })
         : null;
@@ -276,17 +287,27 @@ export class SourcesRuntime {
   }
 }
 
-/** TMDB 请求响应缓存:PG kv_cache region=tmdb.request;PG 出错按未命中 / 不写处理,不让 TMDB 请求失败 */
+/**
+ * TMDB 请求响应缓存:PG kv_cache region=tmdb.request;PG 出错按未命中 / 不写处理,不让 TMDB 请求失败。
+ * 详情命中且属于追踪中的作品时续期(CACHE-2),续期失败只记 debug。
+ */
 function tmdbSharedCache(ctx: ServerContext, policy: TmdbCachePolicy): TmdbSharedCache {
   const cache = sharedCache(ctx);
   const warn = (err: unknown) =>
     ctx.logger.warn({ err: { message: (err as Error).message } }, "TMDB 缓存读写失败，按未命中处理");
   return {
-    get: (key) =>
-      cache.get(CACHE_REGIONS.tmdbRequest, key).catch((e) => {
+    get: async (key) => {
+      const v = await cache.get(CACHE_REGIONS.tmdbRequest, key).catch((e) => {
         warn(e);
         return null;
-      }),
+      });
+      if (v !== null && tmdbDetailRef(key)) {
+        await renewTrackedTmdbDetail(ctx, key, policy.ttl).catch((e) =>
+          ctx.logger.debug({ err: { message: (e as Error).message } }, "TMDB 详情缓存续期失败"),
+        );
+      }
+      return v;
+    },
     set: (key, value, ttlMs) =>
       cache.set(CACHE_REGIONS.tmdbRequest, key, value, { ttl: ttlMs / 1000, maxsize: policy.maxsize }).catch(warn),
   };
diff --git a/apps/server/src/modules/sources-identity/service/detail-page.ts b/apps/server/src/modules/sources-identity/service/detail-page.ts
index dadeb58f..ec95f634 100644
--- a/apps/server/src/modules/sources-identity/service/detail-page.ts
+++ b/apps/server/src/modules/sources-identity/service/detail-page.ts
@@ -1,18 +1,18 @@
 import type { SiteDetailPage } from "@umt/adapters";
 import type { SiteReleasePage } from "@umt/contracts";
 import { sql } from "@umt/db";
-import { sharedCache } from "../../../shared-cache.ts";
+import { sharedCache, storageSettings } from "../../../shared-cache.ts";
 import type { SourcesRuntime } from "../runtime.ts";
 import type { Exec } from "./common.ts";
 
 // 站点详情页扩展内容(简介 / MediaInfo / 截图 / 外部 ID / 文件 / 标签 / 上传者):
 // - 只在按需抓详情时得到(工作台打开详情、release.inspect 复核),放 PG kv_cache region site.detail,
-//   key = source_release.id,TTL = 站点详情缓存期(至少 24 小时);不进 source_release 列,过期即丢。
+//   key = source_release.id,TTL = storage.cacheTtl.siteDetailDays(CACHE-2,缺省 7 天;不短于站点详情缓存期);
+//   不进 source_release 列,过期即丢。促销 / H&R 不靠它:下载前复核走 refreshReleaseDetail(按站点详情缓存期判断是否重抓)。
 // - 外部 ID(IMDb / 豆瓣 / TMDB)另写 source_release.raw._detail(列表快照 upsert 不覆盖它),供身份解析用。
 // - 截图对外只给代理路径 /api/v1/img/site-detail/{releaseId}/{index},原始地址留在服务端。
 
 export const DETAIL_PAGE_REGION = "site.detail";
-const MIN_TTL_SEC = 86_400;
 const MAX_ENTRIES = 5_000;
 
 interface StoredPage extends SiteDetailPage {
@@ -33,8 +33,9 @@ export async function saveDetailPage(
   cacheSec: number,
 ): Promise<void> {
   const stored: StoredPage = { ...page, fetchedAt: rt.now().toISOString() };
+  const { siteDetailDays } = (await storageSettings(rt.ctx)).cacheTtl;
   await sharedCache(rt.ctx)
-    .set(DETAIL_PAGE_REGION, srId, stored, { ttl: Math.max(cacheSec, MIN_TTL_SEC), maxsize: MAX_ENTRIES })
+    .set(DETAIL_PAGE_REGION, srId, stored, { ttl: Math.max(cacheSec, siteDetailDays * 86_400), maxsize: MAX_ENTRIES })
     .catch((e) => rt.ctx.logger.warn({ err: { message: (e as Error).message } }, "详情页缓存写入失败"));
   const ids: DetailIds = {
     ...(page.imdbId ? { imdbId: page.imdbId } : {}),
diff --git a/apps/server/src/modules/sources-identity/service/identity-decisions.ts b/apps/server/src/modules/sources-identity/service/identity-decisions.ts
index aa850a39..0dd5473f 100644
--- a/apps/server/src/modules/sources-identity/service/identity-decisions.ts
+++ b/apps/server/src/modules/sources-identity/service/identity-decisions.ts
@@ -1,5 +1,6 @@
 import type { DecisionOption, PoolCandidate } from "@umt/contracts";
 import { sql } from "@umt/db";
+import { storageSettings } from "../../../shared-cache.ts";
 import type { ServerContext } from "../../types.ts";
 import { jsonb } from "../rows.ts";
 import type { SourcesRuntime } from "../runtime.ts";
@@ -10,7 +11,7 @@ import { closeDecisions, type Exec, openDecision } from "./common.ts";
 // - 同一来源 + 同一归一化标题合并为一条事项(dedupeKey identity-group:<siteId>:<normalized>),成员 = 池里
 //   decision_id 指向它且仍 pending 的条目;事项的 subject 与候选选项取自代表资源(最近一次进来的那条);
 // - 成员被识别 / 指定 / 忽略时从组里摘除,组空了才关闭事项;
-// - unmatched 池条目超过 identity.poolArchiveDays 没有新证据就归档。
+// - unmatched 池条目超过 storage.retentionDays.identityPoolArchive 天没有新证据就归档。
 
 const OPEN = ["open", "investigating", "awaiting_user"] as const;
 /** 事项证据里最多列多少条成员资源(完整列表在待识别池按标题检索) */
@@ -208,14 +209,15 @@ const ARCHIVE_EVERY_MS = 3600_000;
 let lastArchiveAt = 0;
 
 /**
- * 过期归档:unmatched 池条目超过 identity.poolArchiveDays 没有新证据 → archived(仍可按状态筛出、可手动指定;
+ * 过期归档:unmatched 池条目超过 storage.retentionDays.identityPoolArchive 天没有新证据 → archived(仍可按状态筛出、可手动指定;
  * 同一资源再被观察到或新增相近别名时回到 pending)。每进程每小时最多执行一次。
  */
 export async function archiveStalePool(rt: SourcesRuntime, opts: { force?: boolean } = {}): Promise<number> {
   const now = rt.now();
   if (!opts.force && now.getTime() - lastArchiveAt < ARCHIVE_EVERY_MS) return 0;
   lastArchiveAt = now.getTime();
-  const { poolArchiveDays } = await rt.ctx.settings.get("identity");
+  // 与存储保留任务 storage.retention.identity_pool 同一条件(那边在 system 模块里按表直接执行)
+  const poolArchiveDays = (await storageSettings(rt.ctx)).retentionDays.identityPoolArchive;
   const cutoff = new Date(now.getTime() - poolArchiveDays * 86_400_000);
   const r = await rt.ctx.db
     .updateTable("identity_candidate")
diff --git a/apps/server/src/modules/sources-identity/service/tmdb-recognize-cache.ts b/apps/server/src/modules/sources-identity/service/tmdb-recognize-cache.ts
index 40a92775..48d3888a 100644
--- a/apps/server/src/modules/sources-identity/service/tmdb-recognize-cache.ts
+++ b/apps/server/src/modules/sources-identity/service/tmdb-recognize-cache.ts
@@ -110,7 +110,8 @@ export async function saveRecognizeCache(
       poster_path: info.posterPath ?? null,
       backdrop_path: info.backdropPath ?? null,
     };
-    await cache.set(CACHE_REGIONS.tmdbRecognize, key, entry, { ttl: policy.ttl, maxsize: policy.maxsize });
+    // 识别结果 = 名称 → TMDB 条目,按搜索类 TTL(storage.cacheTtl.tmdbSearchDays)
+    await cache.set(CACHE_REGIONS.tmdbRecognize, key, entry, { ttl: policy.searchTtl, maxsize: policy.maxsize });
     return;
   }
   // 负识别缓存用独立短 TTL(EMPTY_RESULT_CACHE_TTL):故障期间的空结果不被固化整个有效期
diff --git a/apps/server/src/modules/system/health.ts b/apps/server/src/modules/system/health.ts
index 800834fb..97acf692 100644
--- a/apps/server/src/modules/system/health.ts
+++ b/apps/server/src/modules/system/health.ts
@@ -28,6 +28,8 @@ export interface HealthDeps {
   checkRoot?: typeof checkRoot;
   /** 单个路径 IO 检查超时(ms),缺省 3000 */
   ioTimeoutMs?: number;
+  /** 存储段(CACHE-2);不给时该段为 unknown */
+  storage?: () => Promise<{ level: HealthLevel; alerts: string[] }>;
 }
 
 const LEVEL_ORDER: HealthLevel[] = ["ok", "warn", "critical"];
@@ -384,7 +386,7 @@ export async function loadSchedules(db: Kysely<DB>, now: Date): Promise<SystemHe
 
 export async function buildHealth(d: HealthDeps): Promise<SystemHealth> {
   const now = d.now?.() ?? new Date();
-  const [{ processes, retiredProcesses }, db, paths, engine, schedules] = await Promise.all([
+  const [{ processes, retiredProcesses }, db, paths, engine, schedules, storage] = await Promise.all([
     loadProcesses(d.db, now).catch(() => ({
       processes: [] as SystemProcess[],
       retiredProcesses: [] as SystemProcess[],
@@ -408,6 +410,10 @@ export async function buildHealth(d: HealthDeps): Promise<SystemHealth> {
       failing: [],
       failedRuns24h: 0,
     })),
+    (d.storage?.() ?? Promise.resolve({ level: "unknown" as HealthLevel, alerts: [] })).catch(() => ({
+      level: "unknown" as HealthLevel,
+      alerts: [] as string[],
+    })),
   ]);
   // SSE:存活的 api/all 进程上报的连接数合计;本进程若还没写过心跳,用实时值
   const selfCounted = processes.some((p) => !p.stale && p.instanceId === d.self.instanceId && p.sseConnections != null);
@@ -423,6 +429,7 @@ export async function buildHealth(d: HealthDeps): Promise<SystemHealth> {
       mountLevel,
       engine.level,
       schedules.level,
+      storage.level,
     ]),
     checkedAt: now.toISOString(),
     api: {
@@ -439,6 +446,7 @@ export async function buildHealth(d: HealthDeps): Promise<SystemHealth> {
     mounts: paths.mounts,
     engine,
     schedules,
+    storage,
   };
 }
 
diff --git a/apps/server/src/modules/system/heartbeat.ts b/apps/server/src/modules/system/heartbeat.ts
index db67f0ab..09d1b0c0 100644
--- a/apps/server/src/modules/system/heartbeat.ts
+++ b/apps/server/src/modules/system/heartbeat.ts
@@ -130,11 +130,13 @@ export async function markHeartbeatStopped(db: Kysely<DB>, instanceId: string, a
 /** 裁剪:超过 24 小时没心跳的进程行、超过 7 天的采样;返回删除行数 */
 export async function pruneHeartbeats(
   db: Kysely<DB>,
-  o: { now?: Date; rowRetentionMs?: number; sampleDays?: number } = {},
+  o: { now?: Date; rowRetentionMs?: number; sampleDays?: number; sampleHours?: number } = {},
 ): Promise<{ rows: number; samples: number }> {
   const now = o.now ?? new Date();
   const rowCutoff = new Date(now.getTime() - (o.rowRetentionMs ?? HEARTBEAT_ROW_RETENTION_MS));
-  const sampleCutoff = new Date(now.getTime() - (o.sampleDays ?? SAMPLE_RETENTION_DAYS) * 24 * 3600_000);
+  // CACHE-2:采样保留取 storage.retentionDays.heartbeatHours(调用方传 sampleHours);sampleDays 为旧参数
+  const sampleHours = o.sampleHours ?? (o.sampleDays ?? SAMPLE_RETENTION_DAYS) * 24;
+  const sampleCutoff = new Date(now.getTime() - sampleHours * 3600_000);
   const rows = await db.deleteFrom("process_heartbeat").where("last_beat_at", "<", rowCutoff).executeTakeFirst();
   const samples = await db.deleteFrom("process_heartbeat_sample").where("at", "<", sampleCutoff).executeTakeFirst();
   return { rows: Number(rows.numDeletedRows), samples: Number(samples.numDeletedRows) };
diff --git a/apps/server/src/modules/system/index.ts b/apps/server/src/modules/system/index.ts
index 3e6a6364..ea77bb97 100644
--- a/apps/server/src/modules/system/index.ts
+++ b/apps/server/src/modules/system/index.ts
@@ -1,9 +1,19 @@
 import { createRoute, type RouteConfig } from "@hono/zod-openapi";
-import { Api, apiResponse, DEFAULT_SETTINGS, type EndpointDef } from "@umt/contracts";
+import {
+  type Actor,
+  Api,
+  apiResponse,
+  DEFAULT_SETTINGS,
+  type EndpointDef,
+  type StorageCleanupTarget,
+} from "@umt/contracts";
+import { sql } from "@umt/db";
 import type { z } from "zod";
 import { dataPaths } from "../../config.ts";
 import { requireScope } from "../../http/auth.ts";
+import { ApiException } from "../../http/errors.ts";
 import { sseConnectionCount } from "../../http/sse.ts";
+import { storageSettings } from "../../shared-cache.ts";
 import { registerScheduledJob } from "../schedules/registry.ts";
 import type { ModuleApp, ServerContext, ServerModule } from "../types.ts";
 import { buildHealth, type HealthDeps, loadHistory } from "./health.ts";
@@ -15,6 +25,8 @@ import {
   safeHostname,
   startHeartbeatWriter,
 } from "./heartbeat.ts";
+import { type BatchOptions, CLEANUP_JOB_IDS, RETENTION_JOBS } from "./retention.ts";
+import { buildStorage, type StoragePaths, storageHealth } from "./storage.ts";
 
 export { HEARTBEAT_STALE_MS, HEARTBEAT_WRITE_MS, startHeartbeatWriter } from "./heartbeat.ts";
 
@@ -23,7 +35,13 @@ export { HEARTBEAT_STALE_MS, HEARTBEAT_WRITE_MS, startHeartbeatWriter } from "./
  * - GET /system/health:进程心跳 / 事件循环延迟 / SSE 连接 / DB / 磁盘 / 挂载根 / 引擎 / 定时任务,仅 admin;
  * - GET /system/health/history?hours=:心跳采样时间序列。
  * 心跳写入:worker 进程在 worker/index.ts 里起写入器;纯 api 进程(role=api)在注册路由时起(role=all 由 worker 写 kind=all)。
- * 清理:定时任务 system.heartbeat_cleanup(维护组,1 小时)删 24 小时没心跳的进程行与 7 天前的采样。
+ * 清理:定时任务 system.heartbeat_cleanup(维护组,1 小时)删 24 小时没心跳的进程行与超过
+ * storage.retentionDays.heartbeatHours 的采样。
+ *
+ * CACHE-2 存储(docs/runbook/storage.md):
+ * - GET /system/storage:表体积 top 15、库体积、kv_cache 各 region、图片 / 备份 / 会话与证据对照预算、DATA_DIR 分目录、清理任务;
+ * - POST /system/storage/cleanup/{target}:把对应的维护任务排入立即执行(同 schedules run_now 语义);
+ * - 保留清理任务 storage.retention.* 与每周 storage.analyze(维护组,各自开关与周期在定时任务看板改)。
  */
 export interface SystemModuleOptions {
   /** 引擎 schema(测试覆盖);缺省 openworkflow */
@@ -34,6 +52,12 @@ export interface SystemModuleOptions {
   apiHeartbeat?: boolean;
   /** 定时任务 system.heartbeat_cleanup 的默认周期,默认 1 小时;<=0 不登记 */
   cleanupIntervalMs?: number;
+  /** 存储面板路径(测试覆盖);缺省按 DATA_DIR / AGENT_SESSION_DIR */
+  storagePaths?: StoragePaths;
+  /** false 时不登记保留清理任务(测试);缺省 true */
+  retentionJobs?: boolean;
+  /** 保留清理的分批参数(测试) */
+  retentionBatch?: BatchOptions;
 }
 
 type Infer<T> = T extends z.ZodType ? z.infer<T> : Record<string, never>;
@@ -41,10 +65,11 @@ type Infer<T> = T extends z.ZodType ? z.infer<T> : Record<string, never>;
 function route<D extends EndpointDef>(
   app: ModuleApp,
   def: D,
-  handler: (i: { query: Infer<D["query"]> }) => Promise<unknown>,
+  handler: (i: { query: Infer<D["query"]>; params: Infer<D["params"]>; actor: Actor | undefined }) => Promise<unknown>,
 ) {
   const request: RouteConfig["request"] = {};
   if (def.query) request.query = def.query as never;
+  if (def.params) request.params = def.params as never;
   const r = createRoute({
     method: def.method,
     path: def.path,
@@ -58,7 +83,13 @@ function route<D extends EndpointDef>(
   });
   // biome-ignore lint/suspicious/noExplicitAny: 路由泛型在封装里擦除,入参已由 zod-openapi 校验
   app.openapi(r, (async (c: any) => {
-    const data = def.response.parse(await handler({ query: def.query ? c.req.valid("query") : {} } as never));
+    const data = def.response.parse(
+      await handler({
+        query: def.query ? c.req.valid("query") : {},
+        params: def.params ? c.req.valid("param") : {},
+        actor: c.get("actor"),
+      } as never),
+    );
     return c.json({ ok: true, data }, 200);
     // biome-ignore lint/suspicious/noExplicitAny: 同上
   }) as any);
@@ -84,6 +115,11 @@ export function createSystemModule(opts: SystemModuleOptions = {}): ServerModule
       }
       const selfKind = ctx.role === "all" ? "all" : ctx.role === "api" ? "api" : null;
       const selfId = selfKind ? instanceIdOf(selfKind, safeHostname(), Deno.pid) : undefined;
+      const paths = (): StoragePaths => {
+        if (opts.storagePaths) return opts.storagePaths;
+        const p = dataPaths(ctx.config);
+        return { dataDir: opts.healthDeps?.dataDir ?? p.dataDir, sessionDir: p.sessionDir };
+      };
 
       route(app, Api.system.healthDetail, async () => {
         const cache = await ctx.settings.get("cache").catch(() => DEFAULT_SETTINGS.cache);
@@ -98,25 +134,89 @@ export function createSystemModule(opts: SystemModuleOptions = {}): ServerModule
             ...(selfId ? { instanceId: selfId } : {}),
           },
           thresholds: { warnPercent: cache.resumePercent, criticalPercent: cache.hardThresholdPercent },
+          storage: async () =>
+            await storageHealth({ db: ctx.db, paths: paths(), settings: await storageSettings(ctx) }),
           ...(opts.healthDeps ?? {}),
         });
       });
       route(app, Api.system.healthHistory, async ({ query }) => await loadHistory(ctx.db, query.hours));
+      route(app, Api.system.storage, async () =>
+        buildStorage({
+          db: ctx.db,
+          paths: paths(),
+          settings: await storageSettings(ctx),
+          engineSchema: opts.engineSchema ?? "openworkflow",
+        }),
+      );
+      route(app, Api.system.storageCleanup, async ({ params, actor }) => {
+        const target = params.target as StorageCleanupTarget;
+        const jobId = CLEANUP_JOB_IDS[target];
+        const job = await ctx.db
+          .selectFrom("scheduled_job")
+          .select(["id", "available"])
+          .where("id", "=", jobId)
+          .executeTakeFirst();
+        if (!job) throw new ApiException("not_found", `清理任务 ${jobId} 还没登记（调度器未同步）`);
+        if (!job.available) throw new ApiException("conflict", "任务未配置，不能执行");
+        // 同 schedules 的立即执行:只置 run_requested_at,已在排队或运行中则合并
+        const r = await sql`update scheduled_job set run_requested_at = now()
+          where id = ${jobId} and run_requested_at is null and running_since is null`.execute(ctx.db);
+        const queued = Number(r.numAffectedRows ?? 0) > 0;
+        if (queued) {
+          await ctx.db
+            .insertInto("audit_event")
+            .values({
+              actor_type: actor?.type === "api_key" ? "api_key" : actor ? "user" : "system",
+              actor_id: actor?.id ?? null,
+              action: "storage.cleanup",
+              target_type: "scheduled_job",
+              target_id: jobId,
+              payload: JSON.stringify({ target }),
+            })
+            .execute()
+            .catch((err) => ctx.logger.warn({ err }, "审计写入失败"));
+        }
+        return { target, jobId, queued };
+      });
     },
     registerTasks() {},
     start(ctx) {
+      if (opts.retentionJobs !== false) {
+        for (const j of RETENTION_JOBS) {
+          registerScheduledJob(ctx, {
+            key: j.jobId,
+            defaults: {
+              name: j.name,
+              description: j.description,
+              group: "maintain",
+              schedule: { type: "interval", everyMs: j.everyMs },
+              firstRun: "after_interval",
+            },
+            run: async ({ now }) => ({
+              summary: await j.run({
+                db: ctx.db,
+                engineSchema: opts.engineSchema ?? "openworkflow",
+                settings: await storageSettings(ctx),
+                now,
+                ...(opts.retentionBatch ? { batch: opts.retentionBatch } : {}),
+              }),
+            }),
+          });
+        }
+      }
       const everyMs = opts.cleanupIntervalMs ?? 3600_000;
       if (everyMs <= 0) return;
       registerScheduledJob(ctx, {
         key: "system.heartbeat_cleanup",
         defaults: {
           name: "进程心跳清理",
-          description: "删除 24 小时没有心跳的进程行和 7 天前的心跳采样",
+          description: "删除 24 小时没有心跳的进程行和超过保留期（存储设置，缺省 24 小时）的心跳采样",
           group: "maintain",
           schedule: { type: "interval", everyMs },
         },
         run: async ({ now }) => {
-          const r = await pruneHeartbeats(ctx.db, { now });
+          const sampleHours = (await storageSettings(ctx)).retentionDays.heartbeatHours;
+          const r = await pruneHeartbeats(ctx.db, { now, sampleHours });
           return { summary: `删除 ${r.rows} 个进程行、${r.samples} 条采样` };
         },
       });
diff --git a/apps/server/src/modules/system/retention.ts b/apps/server/src/modules/system/retention.ts
new file mode 100644
index 00000000..93185f4d
--- /dev/null
+++ b/apps/server/src/modules/system/retention.ts
@@ -0,0 +1,273 @@
+import type { StorageCleanupTarget, StorageSettings } from "@umt/contracts";
+import { type DB, type Kysely, type RawBuilder, sql } from "@umt/db";
+
+// CACHE-2 保留策略清理(docs/runbook/storage.md):按表按时间列分批删除流水数据。
+// - 每批:单独事务,`set local statement_timeout / lock_timeout` 限时,按 ctid 取一批再删,不做整表长事务;
+// - 每次运行有总时限,到点就停,剩下的留给下次;批与批之间让出一小段时间给业务写入;
+// - 只删已结束的数据(任务 / Agent 会话 / 能力调用看状态),进行中的不动。
+// 待识别池不删:unmatched 条目到期归档(与 sources-identity archiveStalePool 同一条件)。
+
+export interface BatchOptions {
+  /** 每批行数,缺省 5000 */
+  batchSize?: number;
+  /** 每批语句超时(ms),缺省 15000 */
+  statementTimeoutMs?: number;
+  /** 等锁超时(ms),缺省 3000 */
+  lockTimeoutMs?: number;
+  /** 本次运行总时限(ms),缺省 5 分钟 */
+  budgetMs?: number;
+  /** 批间停顿(ms),缺省 50 */
+  pauseMs?: number;
+  /** 测试注入 */
+  now?: () => number;
+}
+
+export interface BatchResult {
+  deleted: number;
+  batches: number;
+  /** 到总时限还没删完 */
+  truncated: boolean;
+}
+
+const sleep = (ms: number) => new Promise((r) => setTimeout(r, ms));
+
+/**
+ * 分批删除 `table` 中满足 `where` 的行:每批 `delete … where ctid = any(array(select ctid … limit n))`,
+ * 单独事务 + 语句 / 锁超时。某批超时(57014)或等锁超时(55P03)时停止本次运行,不抛错。
+ */
+export async function deleteInBatches(
+  db: Kysely<DB>,
+  table: RawBuilder<unknown>,
+  where: RawBuilder<unknown>,
+  o: BatchOptions = {},
+): Promise<BatchResult> {
+  const size = o.batchSize ?? 5000;
+  const now = o.now ?? Date.now;
+  const deadline = now() + (o.budgetMs ?? 5 * 60_000);
+  let deleted = 0;
+  let batches = 0;
+  for (;;) {
+    let n: number;
+    try {
+      n = await db.transaction().execute(async (trx) => {
+        await sql`select set_config('statement_timeout', ${String(o.statementTimeoutMs ?? 15_000)}, true),
+                         set_config('lock_timeout', ${String(o.lockTimeoutMs ?? 3000)}, true)`.execute(trx);
+        const r = await sql`delete from ${table} where ctid = any(array(
+            select ctid from ${table} where ${where} limit ${size}))`.execute(trx);
+        return Number(r.numAffectedRows ?? 0);
+      });
+    } catch (e) {
+      const code = (e as { code?: string }).code;
+      if (code === "57014" || code === "55P03") return { deleted, batches, truncated: true };
+      throw e;
+    }
+    batches++;
+    deleted += n;
+    if (n < size) return { deleted, batches, truncated: false };
+    if (now() >= deadline) return { deleted, batches, truncated: true };
+    if ((o.pauseMs ?? 50) > 0) await sleep(o.pauseMs ?? 50);
+  }
+}
+
+export interface RetentionJob {
+  target: StorageCleanupTarget;
+  /** scheduled_job key */
+  jobId: string;
+  name: string;
+  description: string;
+  everyMs: number;
+  /** 保留期说明(存储面板) */
+  retention(s: StorageSettings): string | null;
+  run(c: RetentionRunContext): Promise<string>;
+}
+
+export interface RetentionRunContext {
+  db: Kysely<DB>;
+  engineSchema: string;
+  settings: StorageSettings;
+  now: Date;
+  batch?: BatchOptions;
+}
+
+const DAY_MS = 86_400_000;
+const cutoffOf = (now: Date, days: number) => new Date(now.getTime() - days * DAY_MS);
+const t = (name: string) => sql.raw(`"${name}"`);
+const summaryOf = (label: string, r: BatchResult) =>
+  `${label}删除 ${r.deleted} 行（${r.batches} 批）${r.truncated ? "，未删完，下次继续" : ""}`;
+
+const HOUR = 3600_000;
+
+/**
+ * 保留清理任务(维护组;heartbeat 目标由 system.heartbeat_cleanup 承担,images / kv_cache 由 cache 模块承担)。
+ * 顺序即存储面板的展示顺序。
+ */
+export const RETENTION_JOBS: RetentionJob[] = [
+  {
+    target: "observation",
+    jobId: "storage.retention.observation",
+    name: "观察记录清理",
+    description: "删除超过保留期的 Feed 观察记录（observation，按 created_at）",
+    everyMs: 6 * HOUR,
+    retention: (s) => `${s.retentionDays.observation} 天`,
+    async run(c) {
+      const cutoff = cutoffOf(c.now, c.settings.retentionDays.observation);
+      const r = await deleteInBatches(c.db, t("observation"), sql`created_at < ${cutoff}`, c.batch);
+      return summaryOf("观察记录", r);
+    },
+  },
+  {
+    target: "sse_event",
+    jobId: "storage.retention.sse_event",
+    name: "SSE 事件清理",
+    description: "删除超过保留期的 SSE 补读事件（sse_event，按 at；发布方另按条数裁剪）",
+    everyMs: HOUR,
+    retention: (s) => `${s.retentionDays.sseEvent} 天`,
+    async run(c) {
+      const cutoff = cutoffOf(c.now, c.settings.retentionDays.sseEvent);
+      const r = await deleteInBatches(c.db, t("sse_event"), sql`at < ${cutoff}`, c.batch);
+      return summaryOf("SSE 事件", r);
+    },
+  },
+  {
+    target: "task_run",
+    jobId: "storage.retention.task_run",
+    name: "任务运行清理",
+    description: "删除超过保留期、已结束的业务任务（task）与引擎 run（含步骤、运行元数据）",
+    everyMs: 6 * HOUR,
+    retention: (s) => `${s.retentionDays.taskRun} 天`,
+    async run(c) {
+      const cutoff = cutoffOf(c.now, c.settings.retentionDays.taskRun);
+      const e = (n: string) => sql.raw(`"${c.engineSchema}"."${n}"`);
+      const task = await deleteInBatches(
+        c.db,
+        t("task"),
+        sql`created_at < ${cutoff} and status in ('succeeded', 'failed', 'cancelled', 'dead')`,
+        c.batch,
+      );
+      // 引擎 run:step_attempts 随 run 级联删除
+      const runs = await deleteInBatches(
+        c.db,
+        e("workflow_runs"),
+        sql`created_at < ${cutoff} and status in ('completed', 'succeeded', 'failed', 'canceled')`,
+        c.batch,
+      );
+      // 运行元数据与 run 同时写入:早于保留期的 run 已结束(上一步删掉了),元数据按时间直接删
+      const meta = await deleteInBatches(c.db, t("tasks_run_meta"), sql`created_at < ${cutoff}`, c.batch);
+      const facts = await deleteInBatches(c.db, t("tasks_fact"), sql`created_at < ${cutoff}`, c.batch);
+      const ledger = await deleteInBatches(
+        c.db,
+        t("tasks_op_ledger"),
+        sql`status = 'succeeded' and started_at < ${cutoff}`,
+        c.batch,
+      );
+      const truncated = [task, runs, meta, facts, ledger].some((x) => x.truncated);
+      return `业务任务 ${task.deleted}、引擎 run ${runs.deleted}、运行元数据 ${meta.deleted + facts.deleted + ledger.deleted} 行已删除${truncated ? "，未删完，下次继续" : ""}`;
+    },
+  },
+  {
+    target: "agent_event",
+    jobId: "storage.retention.agent_event",
+    name: "Agent 事件清理",
+    description: "删除超过保留期、会话已结束的 Agent 事件流与消息（agent_run_event / agent_run_message；会话本身保留）",
+    everyMs: 6 * HOUR,
+    retention: (s) => `${s.retentionDays.agentEvent} 天`,
+    async run(c) {
+      const cutoff = cutoffOf(c.now, c.settings.retentionDays.agentEvent);
+      const ended = sql`exists (select 1 from agent_run r where r.id = run_id
+        and r.status in ('succeeded', 'failed', 'cancelled', 'budget_exceeded'))`;
+      const ev = await deleteInBatches(c.db, t("agent_run_event"), sql`at < ${cutoff} and ${ended}`, c.batch);
+      const msg = await deleteInBatches(
+        c.db,
+        t("agent_run_message"),
+        sql`created_at < ${cutoff} and status = 'consumed' and ${ended}`,
+        c.batch,
+      );
+      return `Agent 事件 ${ev.deleted}、消息 ${msg.deleted} 行已删除${ev.truncated || msg.truncated ? "，未删完，下次继续" : ""}`;
+    },
+  },
+  {
+    target: "audit",
+    jobId: "storage.retention.audit",
+    name: "审计清理",
+    description: "删除超过保留期的审计事件（audit_event，能力调用审计按能力统计的保留期另算）",
+    everyMs: 24 * HOUR,
+    retention: (s) => `${s.retentionDays.audit} 天`,
+    async run(c) {
+      const cutoff = cutoffOf(c.now, c.settings.retentionDays.audit);
+      const r = await deleteInBatches(
+        c.db,
+        t("audit_event"),
+        sql`at < ${cutoff} and target_type is distinct from 'capability'`,
+        c.batch,
+      );
+      return summaryOf("审计事件", r);
+    },
+  },
+  {
+    target: "capability_stats",
+    jobId: "storage.retention.capability_stats",
+    name: "能力统计清理",
+    description: "删除超过保留期的能力调用审计（audit_event target_type=capability）与已结束的能力调用记录",
+    everyMs: 24 * HOUR,
+    retention: (s) => `${s.retentionDays.capabilityStats} 天`,
+    async run(c) {
+      const cutoff = cutoffOf(c.now, c.settings.retentionDays.capabilityStats);
+      const a = await deleteInBatches(
+        c.db,
+        t("audit_event"),
+        sql`at < ${cutoff} and target_type = 'capability'`,
+        c.batch,
+      );
+      const inv = await deleteInBatches(
+        c.db,
+        t("capability_invocation"),
+        sql`created_at < ${cutoff} and status <> 'running'`,
+        c.batch,
+      );
+      return `能力审计 ${a.deleted}、调用记录 ${inv.deleted} 行已删除${a.truncated || inv.truncated ? "，未删完，下次继续" : ""}`;
+    },
+  },
+  {
+    target: "identity_pool",
+    jobId: "storage.retention.identity_pool",
+    name: "待识别池归档",
+    description: "待识别池里 unmatched 条目超过保留期没有新证据就归档（不删除，仍可按状态筛出）",
+    everyMs: 6 * HOUR,
+    retention: (s) => `${s.retentionDays.identityPoolArchive} 天`,
+    async run(c) {
+      const cutoff = cutoffOf(c.now, c.settings.retentionDays.identityPoolArchive);
+      let archived = 0;
+      const size = c.batch?.batchSize ?? 5000;
+      for (;;) {
+        const r = await sql`update identity_candidate set status = 'archived', next_review_at = null
+          where id in (select id from identity_candidate where status = 'pending' and reason = 'unmatched'
+                         and coalesce(last_attempt_at, created_at) < ${cutoff} limit ${size})`.execute(c.db);
+        const n = Number(r.numAffectedRows ?? 0);
+        archived += n;
+        if (n < size) break;
+      }
+      return `归档 ${archived} 条待识别条目`;
+    },
+  },
+  {
+    target: "analyze",
+    jobId: "storage.analyze",
+    name: "统计信息更新",
+    description: "对全库执行 ANALYZE，刷新查询规划用的统计信息（每周）",
+    everyMs: 7 * 24 * HOUR,
+    retention: () => null,
+    async run(c) {
+      const started = Date.now();
+      await sql`analyze`.execute(c.db);
+      return `ANALYZE 完成，用时 ${Math.round((Date.now() - started) / 100) / 10} 秒`;
+    },
+  },
+];
+
+/** 清理目标 → 定时任务 key(heartbeat / images / kv_cache 由其它任务承担) */
+export const CLEANUP_JOB_IDS: Record<StorageCleanupTarget, string> = {
+  ...(Object.fromEntries(RETENTION_JOBS.map((j) => [j.target, j.jobId])) as Record<string, string>),
+  heartbeat: "system.heartbeat_cleanup",
+  images: "cache.images_lru",
+  kv_cache: "cache.sweep",
+} as Record<StorageCleanupTarget, string>;
diff --git a/apps/server/src/modules/system/storage.ts b/apps/server/src/modules/system/storage.ts
new file mode 100644
index 00000000..5eb9aa14
--- /dev/null
+++ b/apps/server/src/modules/system/storage.ts
@@ -0,0 +1,347 @@
+import { promises as fs } from "node:fs";
+import { join, relative } from "node:path";
+import type { HealthLevel, StorageBudgetUsage, StorageSettings, SystemStorage } from "@umt/contracts";
+import { type DB, type Kysely, sql } from "@umt/db";
+import { worst } from "./health.ts";
+import { CLEANUP_JOB_IDS, RETENTION_JOBS } from "./retention.ts";
+
+// CACHE-2 存储面板(GET /system/storage)与 health 的存储档位。
+// 目录遍历可能很慢(图片缓存几十万个文件),结果按目录集合缓存 5 分钟;health 只用缓存值,过期时后台刷新,不等。
+
+const GB = 1024 ** 3;
+const DIR_TTL_MS = 5 * 60_000;
+
+export interface StoragePaths {
+  dataDir: string;
+  /** Agent 会话目录(可能在 DATA_DIR 之外) */
+  sessionDir: string;
+  /** 图片缓存目录;缺省 DATA_DIR/cache/images */
+  imagesDir?: string;
+}
+
+export interface DirUsage {
+  name: string;
+  path: string;
+  usedBytes: number;
+  files: number;
+  error: string | null;
+}
+
+interface DirScan {
+  at: Date;
+  dirs: DirUsage[];
+  images: DirUsage;
+  sessions: DirUsage;
+  evidence: DirUsage;
+  backups: DirUsage & { count: number };
+}
+
+async function walk(path: string): Promise<{ bytes: number; files: number; error: string | null }> {
+  let bytes = 0;
+  let files = 0;
+  const go = async (d: string, top: boolean): Promise<string | null> => {
+    let names: string[];
+    try {
+      names = await fs.readdir(d);
+    } catch (e) {
+      const code = (e as { code?: string }).code;
+      // 目录不存在按 0 计
+      return top && code !== "ENOENT" ? (code ?? (e as Error).message) : null;
+    }
+    for (const n of names) {
+      const p = join(d, n);
+      const st = await fs.lstat(p).catch(() => null);
+      if (!st) continue;
+      if (st.isDirectory()) await go(p, false);
+      else {
+        bytes += st.size;
+        files++;
+      }
+    }
+    return null;
+  };
+  const error = await go(path, true);
+  return { bytes, files, error };
+}
+
+const usageOf = async (name: string, path: string): Promise<DirUsage> => {
+  const w = await walk(path);
+  return { name, path, usedBytes: w.bytes, files: w.files, error: w.error };
+};
+
+/** DATA_DIR 一级目录(cache / tmp 再细分一层)+ 会话目录 + 备份份数 */
+export async function scanDirs(p: StoragePaths): Promise<DirScan> {
+  const dirs: DirUsage[] = [];
+  const top = await fs.readdir(p.dataDir, { withFileTypes: true }).catch(() => []);
+  for (const e of top.sort((a, b) => a.name.localeCompare(b.name))) {
+    if (!e.isDirectory()) continue;
+    const path = join(p.dataDir, e.name);
+    if (e.name === "cache" || e.name === "tmp") {
+      const sub = await fs.readdir(path, { withFileTypes: true }).catch(() => []);
+      for (const s of sub.sort((a, b) => a.name.localeCompare(b.name))) {
+        if (s.isDirectory()) dirs.push(await usageOf(`${e.name}/${s.name}`, join(path, s.name)));
+      }
+      continue;
+    }
+    dirs.push(await usageOf(e.name, path));
+  }
+  const find = async (path: string, name: string) => dirs.find((d) => d.path === path) ?? (await usageOf(name, path));
+  const imagesDir = p.imagesDir ?? join(p.dataDir, "cache", "images");
+  const backupsDir = join(p.dataDir, "backups");
+  const backupNames = await fs.readdir(backupsDir, { withFileTypes: true }).catch(() => []);
+  const sessionsInData = !relative(p.dataDir, p.sessionDir).startsWith("..");
+  const sessions = await find(p.sessionDir, "agent-sessions");
+  if (!sessionsInData) dirs.push(sessions);
+  return {
+    at: new Date(),
+    dirs,
+    images: await find(imagesDir, "cache/images"),
+    sessions,
+    evidence: await find(join(p.dataDir, "tmp", "evidence"), "tmp/evidence"),
+    backups: {
+      ...(await find(backupsDir, "backups")),
+      count: backupNames.filter((b) => b.isDirectory() && !b.name.startsWith(".")).length,
+    },
+  };
+}
+
+const scans = new Map<string, { at: number; value: Promise<DirScan>; last: DirScan | null }>();
+
+/**
+ * 目录用量(缓存 5 分钟)。wait=false 时不等遍历:有旧值返回旧值(过期则后台刷新),没有返回 null。
+ */
+export async function dirScan(p: StoragePaths, o: { wait: boolean; force?: boolean }): Promise<DirScan | null> {
+  const key = `${p.dataDir}\u0000${p.sessionDir}\u0000${p.imagesDir ?? ""}`;
+  const cur = scans.get(key);
+  if (!cur || o.force || Date.now() - cur.at > DIR_TTL_MS) {
+    const value = scanDirs(p);
+    const entry = { at: Date.now(), value, last: cur?.last ?? null };
+    scans.set(key, entry);
+    value.then(
+      (v) => {
+        entry.last = v;
+      },
+      () => {
+        if (scans.get(key) === entry) scans.delete(key);
+      },
+    );
+    if (o.wait) return await value;
+    return entry.last;
+  }
+  if (o.wait) return await cur.value;
+  return cur.last;
+}
+
+/** 测试用 */
+export function resetDirScans(): void {
+  scans.clear();
+}
+
+/** 用量对照预算:≥ budget critical,≥ warn warn */
+export function budgetLevel(used: number | null, budget: number | null, warn: number | null): HealthLevel {
+  if (used === null) return "unknown";
+  if (budget !== null && used >= budget) return "critical";
+  if (warn !== null && used >= warn) return "warn";
+  return "ok";
+}
+
+const gb = (v: number) => Math.round(v * GB);
+
+function usage(used: number | null, budgetGb: number, warnGb: number, error: string | null = null): StorageBudgetUsage {
+  const budgetBytes = gb(budgetGb);
+  const warnBytes = gb(warnGb);
+  return {
+    usedBytes: used,
+    budgetBytes,
+    warnBytes,
+    level: error ? "unknown" : budgetLevel(used, budgetBytes, warnBytes),
+    error,
+  };
+}
+
+/**
+ * 图片缓存有容量 LRU(到预算就按最久未访问删),接近预算是常态:超过预算 10% 才告警(说明 LRU 没跟上),不给 critical。
+ */
+function imagesUsage(used: number | null, budgetGb: number, error: string | null): StorageBudgetUsage {
+  const budgetBytes = gb(budgetGb);
+  const warnBytes = Math.round(budgetBytes * 1.1);
+  return {
+    usedBytes: used,
+    budgetBytes,
+    warnBytes,
+    level: error ? "unknown" : used === null ? "unknown" : used >= warnBytes ? "warn" : "ok",
+    error,
+  };
+}
+
+const fmtGb = (b: number | null) => (b === null ? "?" : `${Math.round((b / GB) * 10) / 10} GB`);
+
+export interface StorageDeps {
+  db: Kysely<DB>;
+  paths: StoragePaths;
+  settings: StorageSettings;
+}
+
+async function dbSize(db: Kysely<DB>): Promise<number> {
+  const r = await sql<{ n: string }>`select pg_database_size(current_database())::text as n`.execute(db);
+  return Number(r.rows[0]?.n ?? 0);
+}
+
+/** 汇总档位 + 告警文案(health 与存储面板共用) */
+function levelsOf(
+  s: StorageSettings,
+  dbBytes: number | null,
+  scan: DirScan | null,
+): {
+  db: StorageBudgetUsage;
+  images: StorageBudgetUsage;
+  backups: StorageBudgetUsage;
+  sessionsEvidence: StorageBudgetUsage;
+  level: HealthLevel;
+  alerts: string[];
+} {
+  const b = s.budgets;
+  const db = usage(dbBytes, b.pgDataGb, b.pgDataWarnGb, dbBytes === null ? "db_unavailable" : null);
+  const images = imagesUsage(scan ? scan.images.usedBytes : null, b.imagesGb, scan?.images.error ?? null);
+  const backups = usage(
+    scan ? scan.backups.usedBytes : null,
+    b.backupsGb,
+    b.backupsGb * 0.8,
+    scan?.backups.error ?? null,
+  );
+  const se = scan ? scan.sessions.usedBytes + scan.evidence.usedBytes : null;
+  const sessionsEvidence = usage(
+    se,
+    b.sessionsEvidenceGb,
+    b.sessionsEvidenceGb * 0.8,
+    scan?.sessions.error ?? scan?.evidence.error ?? null,
+  );
+  const alerts: string[] = [];
+  const say = (label: string, u: StorageBudgetUsage) => {
+    if (u.level === "warn" || u.level === "critical") {
+      alerts.push(
+        `${label} ${fmtGb(u.usedBytes)}，${u.level === "critical" ? "已超过预算" : "超过告警线"} ${fmtGb(u.level === "critical" ? u.budgetBytes : u.warnBytes)}`,
+      );
+    }
+  };
+  say("数据库", db);
+  say("图片缓存", images);
+  say("备份", backups);
+  say("会话与证据", sessionsEvidence);
+  return {
+    db,
+    images,
+    backups,
+    sessionsEvidence,
+    level: worst([db.level, images.level, backups.level, sessionsEvidence.level]),
+    alerts,
+  };
+}
+
+/** health 的存储段:库体积实时取,目录用量只用缓存(不等遍历) */
+export async function storageHealth(d: StorageDeps): Promise<{ level: HealthLevel; alerts: string[] }> {
+  const [bytes, scan] = await Promise.all([
+    dbSize(d.db).catch(() => null),
+    dirScan(d.paths, { wait: false }).catch(() => null),
+  ]);
+  const l = levelsOf(d.settings, bytes, scan);
+  return { level: l.level, alerts: l.alerts };
+}
+
+export async function buildStorage(
+  d: StorageDeps & { engineSchema: string; refresh?: boolean },
+): Promise<SystemStorage> {
+  const [bytes, scan, tables, kv, jobs] = await Promise.all([
+    dbSize(d.db).catch(() => null),
+    dirScan(d.paths, { wait: true, force: d.refresh ?? false }).catch(() => null),
+    sql<{
+      schema: string;
+      name: string;
+      total: string;
+      tbl: string;
+      idx: string;
+      rows: number | null;
+      dead: number | null;
+      vac: Date | null;
+      ana: Date | null;
+    }>`select n.nspname as schema, c.relname as name,
+          pg_total_relation_size(c.oid)::text as total, pg_relation_size(c.oid)::text as tbl,
+          pg_indexes_size(c.oid)::text as idx,
+          case when c.reltuples < 0 then null else c.reltuples::bigint end as rows,
+          s.n_dead_tup as dead, s.last_autovacuum as vac,
+          greatest(s.last_analyze, s.last_autoanalyze) as ana
+        from pg_class c join pg_namespace n on n.oid = c.relnamespace
+        left join pg_stat_all_tables s on s.relid = c.oid
+       where c.relkind in ('r', 'm', 'p') and n.nspname not in ('pg_catalog', 'information_schema')
+         and n.nspname not like 'pg_toast%'
+       order by pg_total_relation_size(c.oid) desc limit 15`.execute(d.db),
+    sql<{ region: string; entries: number; expired: number; bytes: string }>`
+      select region, count(*)::int as entries, count(*) filter (where expires_at <= now())::int as expired,
+             coalesce(sum(pg_column_size(value) + pg_column_size(key)), 0)::text as bytes
+        from kv_cache group by region order by region`
+      .execute(d.db)
+      .catch(() => ({ rows: [] })),
+    d.db
+      .selectFrom("scheduled_job")
+      .select(["id", "enabled", "last_run_at", "last_status", "next_run_at"])
+      .where("id", "in", Object.values(CLEANUP_JOB_IDS))
+      .execute()
+      .catch(() => []),
+  ]);
+  const lastSummaries = new Map<string, string | null>();
+  if (jobs.length) {
+    const r = await sql<{ job_id: string; summary: string | null; error: string | null }>`
+      select distinct on (job_id) job_id, summary, error from scheduled_job_run
+       where job_id in (${sql.join(jobs.map((j) => j.id))}) and status <> 'running'
+       order by job_id, started_at desc`
+      .execute(d.db)
+      .catch(() => ({ rows: [] as { job_id: string; summary: string | null; error: string | null }[] }));
+    for (const x of r.rows) lastSummaries.set(x.job_id, x.summary ?? x.error);
+  }
+  const l = levelsOf(d.settings, bytes, scan);
+  const s = d.settings;
+  const retentionOf: Record<string, string | null> = {
+    ...Object.fromEntries(RETENTION_JOBS.map((j) => [j.target, j.retention(s)])),
+    heartbeat: `${s.retentionDays.heartbeatHours} 小时`,
+    images: `容量 ${s.budgets.imagesGb} GB`,
+    kv_cache: null,
+  };
+  const iso = (v: Date | string | null) => (v ? new Date(v).toISOString() : null);
+  return {
+    level: l.level,
+    checkedAt: new Date().toISOString(),
+    dirsScannedAt: scan ? scan.at.toISOString() : null,
+    db: {
+      ...l.db,
+      tables: tables.rows.map((t) => ({
+        schema: t.schema,
+        name: t.name,
+        totalBytes: Number(t.total),
+        tableBytes: Number(t.tbl),
+        indexBytes: Number(t.idx),
+        rowsEstimate: t.rows === null ? null : Number(t.rows),
+        deadRows: t.dead === null ? null : Number(t.dead),
+        lastAutovacuumAt: iso(t.vac),
+        lastAnalyzeAt: iso(t.ana),
+      })),
+    },
+    kvCache: kv.rows.map((r) => ({ region: r.region, entries: r.entries, expired: r.expired, bytes: Number(r.bytes) })),
+    images: { ...l.images, files: scan ? scan.images.files : null },
+    backups: { ...l.backups, count: scan ? scan.backups.count : null },
+    sessionsEvidence: l.sessionsEvidence,
+    dataDir: scan?.dirs ?? [],
+    cleanup: (Object.entries(CLEANUP_JOB_IDS) as [keyof typeof CLEANUP_JOB_IDS, string][]).map(([target, jobId]) => {
+      const j = jobs.find((x) => x.id === jobId);
+      return {
+        target,
+        jobId,
+        retention: retentionOf[target] ?? null,
+        enabled: j ? j.enabled : null,
+        lastRunAt: iso(j?.last_run_at ?? null),
+        lastStatus: j?.last_status ?? null,
+        lastSummary: lastSummaries.get(jobId) ?? null,
+        nextRunAt: iso(j?.next_run_at ?? null),
+      };
+    }),
+  };
+}
diff --git a/apps/server/src/modules/websearch/service.ts b/apps/server/src/modules/websearch/service.ts
index 2c9dd03b..5187a61f 100644
--- a/apps/server/src/modules/websearch/service.ts
+++ b/apps/server/src/modules/websearch/service.ts
@@ -17,10 +17,11 @@ import {
   type WebSearchTestResult,
 } from "@umt/contracts";
 import { cachedCall, pgCacheFor, pgTokenBucketFor } from "@umt/db";
+import { storageSettings } from "../../shared-cache.ts";
 import type { ServerContext } from "../types.ts";
 
 /**
- * WEB-1 网页搜索服务:Brave 客户端之上的 Key 读取、每分钟上限(跨进程令牌桶)、10 分钟 PG 缓存(kv_cache region websearch)、
+ * WEB-1 网页搜索服务:Brave 客户端之上的 Key 读取、每分钟上限(跨进程令牌桶)、PG 缓存(kv_cache region websearch,TTL = storage.cacheTtl.webSearchDays)、
  * 以及 web.fetch 的白名单——按调用方(Agent 会话 / 其它调用者)记录最近一次 web.search 返回的 URL,只允许读取这些 URL。
  */
 
@@ -36,8 +37,6 @@ export interface WebSearchModuleOptions {
 export const WEBSEARCH_CACHE_REGION = "websearch";
 /** 白名单:key = 调用方,value = 最近一次搜索的 URL */
 export const WEBSEARCH_ALLOW_REGION = "websearch.allow";
-/** 搜索结果缓存 10 分钟 */
-export const SEARCH_CACHE_TTL_SEC = 600;
 const SEARCH_CACHE_MAX = 1000;
 /** 白名单保留 6 小时(会话时长上限远小于此) */
 const ALLOW_TTL_SEC = 6 * 3600;
@@ -142,7 +141,7 @@ export class WebSearchService {
       key,
       {
         region: WEBSEARCH_CACHE_REGION,
-        ttl: SEARCH_CACHE_TTL_SEC,
+        ttl: (await storageSettings(this.ctx)).cacheTtl.webSearchDays * 86_400,
         maxsize: SEARCH_CACHE_MAX,
         ...(o.fresh ? { fresh: true } : {}),
       },
diff --git a/apps/server/src/shared-cache.ts b/apps/server/src/shared-cache.ts
index 193a9aad..6cf2099c 100644
--- a/apps/server/src/shared-cache.ts
+++ b/apps/server/src/shared-cache.ts
@@ -1,9 +1,10 @@
-import { DEFAULT_SETTINGS } from "@umt/contracts";
-import { type PgCache, pgCacheFor } from "@umt/db";
+import { DEFAULT_SETTINGS, type StorageSettings, withStorageDefaults } from "@umt/contracts";
+import { type PgCache, pgCacheFor, sql } from "@umt/db";
 import type { ServerContext } from "./modules/types.ts";
 
 // 进程级共享缓存入口:PG kv_cache(移植 MP app/runtime/cache.py 的 TTLCache,存储换成 PG,三进程共享)。
-// region 与 TTL 规则见 docs/runbook/cache.md 与 docs/porting/moviepilot-tmdb-cache.md。
+// region 与 TTL 规则见 docs/runbook/cache.md 与 docs/porting/moviepilot-tmdb-cache.md;
+// CACHE-2 起各 region 的 TTL 取值来源是 settings.storage.cacheTtl(docs/runbook/storage.md),语义不变。
 
 export const CACHE_REGIONS = {
   /** TMDB 请求响应(MP TMDb.request 的 @cached):key = path?query */
@@ -12,14 +13,27 @@ export const CACHE_REGIONS = {
   tmdbRecognize: "tmdb.recognize",
 } as const;
 
+const DAY = 86_400;
+
 export function sharedCache(ctx: Pick<ServerContext, "db">): PgCache {
   return pgCacheFor(ctx.db);
 }
 
-/** TMDB 缓存策略(MP:CONF.meta = META_CACHE_EXPIRE 小时、CONF.tmdb 条数、EMPTY_RESULT_CACHE_TTL 秒) */
+/** settings.storage(读失败用缺省) */
+export async function storageSettings(ctx: Pick<ServerContext, "settings">): Promise<StorageSettings> {
+  return withStorageDefaults(await ctx.settings.get("storage").catch(() => undefined));
+}
+
+/**
+ * TMDB 缓存策略(MP:CONF.meta = META_CACHE_EXPIRE、CONF.tmdb 条数、EMPTY_RESULT_CACHE_TTL)。
+ * CACHE-2:MP 只有一个 CONF.meta,这里按请求类别取 storage.cacheTtl:搜索 / find 与识别结果用 searchTtl,
+ * 详情(/movie/{id}、/tv/{id}、季)用 ttl(= tmdbDetailDays),空结果与未识别负缓存用 emptyTtl。
+ */
 export interface TmdbCachePolicy {
-  /** 秒 */
+  /** 详情 TTL(秒) */
   ttl: number;
+  /** 搜索 / find / 识别结果 TTL(秒) */
+  searchTtl: number;
   maxsize: number;
   /** 秒 */
   emptyTtl: number;
@@ -27,10 +41,61 @@ export interface TmdbCachePolicy {
 
 export async function tmdbCachePolicy(ctx: Pick<ServerContext, "settings">): Promise<TmdbCachePolicy> {
   const c = await ctx.settings.get("cache").catch(() => DEFAULT_SETTINGS.cache);
-  const d = DEFAULT_SETTINGS.cache;
+  const t = (await storageSettings(ctx)).cacheTtl;
   return {
-    ttl: (c.tmdbTtlHours ?? d.tmdbTtlHours) * 3600,
-    maxsize: c.tmdbMaxSize ?? d.tmdbMaxSize,
-    emptyTtl: c.emptyResultTtlSec ?? d.emptyResultTtlSec,
+    ttl: t.tmdbDetailDays * DAY,
+    searchTtl: t.tmdbSearchDays * DAY,
+    maxsize: c.tmdbMaxSize ?? DEFAULT_SETTINGS.cache.tmdbMaxSize,
+    emptyTtl: t.tmdbMissDays * DAY,
   };
 }
+
+/** TMDB 请求键是否是搜索类(按 searchTtl 缓存) */
+export function isTmdbSearchPath(key: string): boolean {
+  return /^\/(search|find)\//.test(key);
+}
+
+/** 详情键 → `movie:<id>` / `tv:<id>`;不是详情返回 null */
+export function tmdbDetailRef(key: string): string | null {
+  const m = /^\/(movie|tv)\/(\d+)(?:[/?]|$)/.exec(key);
+  return m ? `${m[1]}:${m[2]}` : null;
+}
+
+// ── 追踪中的作品:详情缓存命中时续期 ──
+// 追踪 = 作品有未结束的订阅(active / paused / pending)且有已接受的 TMDB 身份。集合按进程缓存 5 分钟。
+
+const TRACKED_TTL_MS = 5 * 60_000;
+const trackedCache = new WeakMap<object, { at: number; set: Promise<Set<string>> }>();
+
+export async function trackedTmdbRefs(ctx: Pick<ServerContext, "db">, now = Date.now()): Promise<Set<string>> {
+  const hit = trackedCache.get(ctx.db);
+  if (hit && now - hit.at < TRACKED_TTL_MS) return hit.set;
+  const set = sql<{ ref: string }>`select distinct x.entity_type || ':' || x.external_id as ref
+      from subscription s join external_identity x on x.media_entity_id = s.media_entity_id
+     where s.status in ('active', 'paused', 'pending') and x.provider = 'tmdb' and x.status = 'accepted'
+       and x.entity_type in ('movie', 'tv')`
+    .execute(ctx.db)
+    .then((r) => new Set(r.rows.map((x) => x.ref)));
+  trackedCache.set(ctx.db, { at: now, set });
+  set.catch(() => trackedCache.delete(ctx.db));
+  return set;
+}
+
+/** 测试用:清掉追踪集合缓存 */
+export function resetTrackedTmdbRefs(ctx: Pick<ServerContext, "db">): void {
+  trackedCache.delete(ctx.db);
+}
+
+/**
+ * TMDB 详情缓存命中后的续期:键属于追踪中的作品时把过期时间推到 now + 详情 TTL(只延长不缩短)。
+ * 返回是否续期。失败不影响命中结果。
+ */
+export async function renewTrackedTmdbDetail(
+  ctx: Pick<ServerContext, "db">,
+  key: string,
+  detailTtlSec: number,
+): Promise<boolean> {
+  const ref = tmdbDetailRef(key);
+  if (!ref || !(await trackedTmdbRefs(ctx)).has(ref)) return false;
+  return await sharedCache(ctx).renew(CACHE_REGIONS.tmdbRequest, key, detailTtlSec);
+}
diff --git a/apps/server/test/cache/cache.test.ts b/apps/server/test/cache/cache.test.ts
index fc8fac34..5736b683 100644
--- a/apps/server/test/cache/cache.test.ts
+++ b/apps/server/test/cache/cache.test.ts
@@ -1,14 +1,14 @@
-import { mkdtempSync, rmSync, utimesSync } from "node:fs";
+import { existsSync, mkdtempSync, rmSync, statSync, utimesSync } from "node:fs";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
 import { PgCache, sql } from "@umt/db";
 import { createMockTmdb, type MockTmdb } from "@umt/testkit";
 import { afterAll, beforeAll, describe, expect, it } from "vitest";
-import { imageCachePath } from "../../src/modules/cache/images.ts";
+import { ImageCache, imageCachePath } from "../../src/modules/cache/images.ts";
 import { createCacheModule } from "../../src/modules/cache/index.ts";
 import { scheduleRegistry } from "../../src/modules/schedules/registry.ts";
 import { SourcesRuntime } from "../../src/modules/sources-identity/runtime.ts";
-import { sharedCache } from "../../src/shared-cache.ts";
+import { resetTrackedTmdbRefs, sharedCache } from "../../src/shared-cache.ts";
 import { bearer, createHarness, type Harness, pgAvailable } from "../auth-settings/harness.ts";
 import { DEV_KEY, json } from "../helpers.ts";
 
@@ -53,31 +53,77 @@ describe.skipIf(!hasPg)("C2-A 缓存(真实 PG)", () => {
     rmSync(dir, { recursive: true, force: true });
   });
 
-  it("TMDB 请求响应进 kv_cache(tmdb.request,TTL = cache.tmdbTtlHours,条数上限 = cache.tmdbMaxSize),另一个进程直接命中", async () => {
+  it("TMDB 请求响应进 kv_cache(tmdb.request,TTL 取 storage.cacheTtl:详情 / 搜索 / 未命中,条数上限 = cache.tmdbMaxSize),另一个进程直接命中", async () => {
     const r = await admin("PATCH", "/settings", {
       metadata: { tmdbApiKey: "0123456789abcdef0123456789abcdef", tmdbBaseUrl: `${tmdb.url}/3` },
-      cache: { tmdbTtlHours: 6, tmdbMaxSize: 16 },
+      cache: { tmdbMaxSize: 16 },
+      storage: { cacheTtl: { tmdbDetailDays: 20, tmdbSearchDays: 3, tmdbMissDays: 2 } },
     });
     expect(r.status).toBe(200);
+    // 部分更新只改给出的子字段,其余保持缺省
+    const st = (await json(await admin("GET", "/settings"))).data.storage;
+    expect(st.cacheTtl).toMatchObject({ tmdbDetailDays: 20, tmdbSearchDays: 3, tmdbMissDays: 2, siteDetailDays: 7 });
+    expect(st.budgets.imagesGb).toBe(20);
     await (await new SourcesRuntime(h.ctx).tmdb())!.details("movie", 872585);
     const calls = tmdb.calls.length;
     const rows = (
-      await sql<{ key: string; hours: number }>`select key, extract(epoch from expires_at - now()) / 3600 as hours
+      await sql<{ key: string; days: number }>`select key, extract(epoch from expires_at - now()) / 86400 as days
         from kv_cache where region = 'tmdb.request'`.execute(h.db)
     ).rows;
-    const key = rows.find((x) => x.key.startsWith("/movie/872585?"))!.key;
+    const detail = rows.find((x) => x.key.startsWith("/movie/872585?"))!;
     expect(rows.every((x) => !x.key.includes("0123456789abcdef"))).toBe(true);
-    expect(Number(rows[0]!.hours)).toBeGreaterThan(5.9);
-    expect(await new PgCache(h.db).get("tmdb.request", key)).toMatchObject({ id: 872585 });
+    expect(Number(detail.days)).toBeGreaterThan(19.9);
+    expect(Number(detail.days)).toBeLessThanOrEqual(20);
+    expect(await new PgCache(h.db).get("tmdb.request", detail.key)).toMatchObject({ id: 872585 });
     await (await new SourcesRuntime(h.ctx).tmdb())!.details("movie", 872585);
     expect(tmdb.calls.length).toBe(calls);
-    // 空搜索结果按 EMPTY_RESULT_CACHE_TTL(30 分钟)
+    const days = async (like: string) =>
+      Number(
+        (
+          await sql<{ d: number }>`select extract(epoch from expires_at - now()) / 86400 as d
+            from kv_cache where region = 'tmdb.request' and key like ${like}`.execute(h.db)
+        ).rows[0]!.d,
+      );
+    // 有结果的搜索按 tmdbSearchDays
+    await (await new SourcesRuntime(h.ctx).tmdb())!.search("Oppenheimer", { type: "movie" });
+    const hit = await days("/search/movie?%Oppenheimer%");
+    expect(hit).toBeGreaterThan(2.9);
+    expect(hit).toBeLessThanOrEqual(3);
+    // 空搜索结果按 EMPTY_RESULT_CACHE_TTL 语义,取 tmdbMissDays
     await (await new SourcesRuntime(h.ctx).tmdb())!.search("完全不存在的片名c2a", { type: "movie" });
-    const empty = (
-      await sql<{ m: number }>`select extract(epoch from expires_at - now()) / 60 as m
-        from kv_cache where region = 'tmdb.request' and key like '/search/movie?%'`.execute(h.db)
-    ).rows[0];
-    expect(Number(empty!.m)).toBeLessThanOrEqual(30);
+    const empty = await days("/search/movie?%c2a%");
+    expect(empty).toBeGreaterThan(1.9);
+    expect(empty).toBeLessThanOrEqual(2);
+  });
+
+  it("追踪中的作品:详情缓存命中时续期到 now + 详情 TTL;未追踪的不动", async () => {
+    const ent = (
+      await sql<{
+        id: string;
+      }>`insert into media_entity (kind, title) values ('movie', '奥本海默') returning id`.execute(h.db)
+    ).rows[0]!.id;
+    await sql`insert into external_identity (media_entity_id, provider, entity_type, external_id, status)
+      values (${ent}, 'tmdb', 'movie', '872585', 'accepted')`.execute(h.db);
+    await sql`insert into subscription (media_entity_id, media_kind, status) values (${ent}, 'movie', 'active')`.execute(
+      h.db,
+    );
+    resetTrackedTmdbRefs(h.ctx);
+    const client = (await new SourcesRuntime(h.ctx).tmdb())!;
+    await client.details("movie", 872585);
+    await client.details("movie", 693134);
+    await sql`update kv_cache set expires_at = now() + interval '1 day'
+      where region = 'tmdb.request' and (key like '/movie/872585?%' or key like '/movie/693134?%')`.execute(h.db);
+    await client.details("movie", 872585);
+    await client.details("movie", 693134);
+    const left = async (like: string) =>
+      Number(
+        (
+          await sql<{ d: number }>`select extract(epoch from expires_at - now()) / 86400 as d
+            from kv_cache where region = 'tmdb.request' and key like ${like}`.execute(h.db)
+        ).rows[0]!.d,
+      );
+    expect(await left("/movie/872585?%")).toBeGreaterThan(19.9);
+    expect(await left("/movie/693134?%")).toBeLessThanOrEqual(1);
   });
 
   it("GET /cache/tmdb 列出条目(键 / 过期 / 大小)与上限;POST /cache/tmdb/clear 清空", async () => {
@@ -88,7 +134,7 @@ describe.skipIf(!hasPg)("C2-A 缓存(真实 PG)", () => {
       { ttl: 3600 },
     );
     const list = await json(await admin("GET", "/cache/tmdb"));
-    expect(list.data).toMatchObject({ maxSize: 16, ttlHours: 6, emptyResultTtlSec: 1800 });
+    expect(list.data).toMatchObject({ maxSize: 16, ttlHours: 20 * 24, emptyResultTtlSec: 2 * 86400 });
     expect(list.data.counts.request).toBeGreaterThan(0);
     const rec = list.data.items.find((i: { kind: string }) => i.kind === "recognize");
     expect(rec).toMatchObject({ tmdbId: 872585, title: "奥本海默", mediaType: "movie", posterPath: "/p.jpg" });
@@ -143,4 +189,54 @@ describe.skipIf(!hasPg)("C2-A 缓存(真实 PG)", () => {
     expect((await json(await admin("GET", "/cache/images"))).data.files).toBe(0);
     expect((await json(await admin("POST", "/cache/images/clear"))).data.deleted).toBe(0);
   });
+
+  it("图片容量 LRU:超过预算按最久未访问(atime)删到预算的 90%;读盘命中刷新 atime、不动 mtime", async () => {
+    const lruDir = mkdtempSync(join(tmpdir(), "umt-c2-lru-"));
+    try {
+      const cache = new ImageCache({
+        dir: lruDir,
+        upstreamBase: "https://image.tmdb.org/t/p",
+        fetch: async () => new Response(new Uint8Array([...JPEG, ...new Uint8Array(92)])),
+      });
+      // 4 张 100 字节的图,访问时间从旧到新 a < b < c < d
+      for (const f of ["a", "b", "c", "d"]) await cache.serve("w92", `${f}.jpg`, false, null);
+      const p = (f: string) => join(lruDir, "t/p/w92", `${f}.jpg`);
+      const base = Date.now() - 10 * 86_400_000;
+      ["a", "b", "c", "d"].forEach((f, i) => {
+        utimesSync(p(f), new Date(base + i * 3600_000), new Date(base));
+      });
+      // 读盘命中 a:atime 变成现在(最近使用),mtime 仍是写入时间
+      await cache.serve("w92", "a.jpg", true, null);
+      await new Promise((r) => setTimeout(r, 50));
+      const st = statSync(p("a"));
+      expect(st.atimeMs).toBeGreaterThan(Date.now() - 60_000);
+      expect(Math.abs(st.mtimeMs - base)).toBeLessThan(1000);
+      // 没超预算不动
+      expect(await cache.enforceBudget(1000)).toMatchObject({ deleted: 0, usedBytes: 400 });
+      // 预算 300 → 删到 ≤ 270:最久未访问的 b、c 被删,a(刚读过)与 d 保留
+      const r = await cache.enforceBudget(300);
+      expect(r).toMatchObject({ deleted: 2, freedBytes: 200, usedBytes: 200 });
+      expect(existsSync(p("a"))).toBe(true);
+      expect(existsSync(p("b"))).toBe(false);
+      expect(existsSync(p("c"))).toBe(false);
+      expect(existsSync(p("d"))).toBe(true);
+    } finally {
+      rmSync(lruDir, { recursive: true, force: true });
+    }
+  });
+
+  it("cache.images_lru 登记为维护任务,预算取 storage.budgets.imagesGb", async () => {
+    await mod.start?.(h.ctx);
+    const job = scheduleRegistry(h.ctx).get("cache.images_lru");
+    expect(job?.defaults).toMatchObject({ group: "maintain", schedule: { everyMs: 30 * 60_000 } });
+    const out = await job!.run({
+      jobId: "cache.images_lru",
+      runId: "r",
+      trigger: "manual",
+      now: new Date(),
+      config: {},
+      slot: "1",
+    });
+    expect(out?.summary).toMatch(/未超过预算 20 GB/);
+  });
 });
diff --git a/apps/server/test/sources-identity/resolve.test.ts b/apps/server/test/sources-identity/resolve.test.ts
index 1ccbc8fa..88add63d 100644
--- a/apps/server/test/sources-identity/resolve.test.ts
+++ b/apps/server/test/sources-identity/resolve.test.ts
@@ -468,18 +468,21 @@ describe.skipIf(!up)("resolveObservation / 身份与元数据", () => {
       ).rows;
     const opp = (await rows()).find((r) => r.key === "[未知][zh-CN]Oppenheimer-2023-None");
     expect(opp?.value).toMatchObject({ id: 872585, type: "movie", title: "奥本海默" });
-    expect(Number(opp!.minutes)).toBeGreaterThan(23 * 60);
+    // 正常条目按搜索类 TTL(storage.cacheTtl.tmdbSearchDays,缺省 7 天)
+    expect(Number(opp!.minutes)).toBeGreaterThan(7 * 24 * 60 - 5);
+    expect(Number(opp!.minutes)).toBeLessThanOrEqual(7 * 24 * 60);
     // 同名同年的另一条资源:命中识别缓存,不再调 TMDB 搜索
     const searches = tmdb.callsTo(/\/3\/search\//).length;
     const again = await release("Oppenheimer.2023.1080p.BluRay.x264-OTHER");
     await resolveRelease(h.rt, { sourceReleaseId: again.id });
     expect(tmdb.callsTo(/\/3\/search\//).length).toBe(searches);
-    // 查无此项 → 负缓存 {id: 0},TTL = 空结果短 TTL(30 分钟)
+    // 查无此项 → 负缓存 {id: 0},TTL = 未命中 TTL(storage.cacheTtl.tmdbMissDays,缺省 1 天)
     const none = await release("Zzqxv.Nonexistent.Title.2019.1080p.WEB-DL-NOGRP");
     await resolveRelease(h.rt, { sourceReleaseId: none.id });
     const neg = (await rows()).find((r) => r.key === "[未知][zh-CN]Zzqxv Nonexistent Title-2019-None");
     expect(neg?.value).toEqual({ id: 0 });
-    expect(Number(neg!.minutes)).toBeLessThanOrEqual(30);
+    expect(Number(neg!.minutes)).toBeLessThanOrEqual(24 * 60);
+    expect(Number(neg!.minutes)).toBeGreaterThan(24 * 60 - 5);
     const s2 = tmdb.callsTo(/\/3\/search\//).length;
     await resolveRelease(h.rt, { sourceReleaseId: none.id });
     expect(tmdb.callsTo(/\/3\/search\//).length).toBe(s2);
diff --git a/apps/server/test/system/storage.test.ts b/apps/server/test/system/storage.test.ts
new file mode 100644
index 00000000..7788d378
--- /dev/null
+++ b/apps/server/test/system/storage.test.ts
@@ -0,0 +1,320 @@
+import { mkdirSync, mkdtempSync, rmSync, writeFileSync } from "node:fs";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+import { DEFAULT_STORAGE_SETTINGS, SystemHealth, SystemStorage } from "@umt/contracts";
+import { type RawBuilder, sql } from "@umt/db";
+import { afterAll, beforeAll, describe, expect, it } from "vitest";
+import { scheduleRegistry } from "../../src/modules/schedules/registry.ts";
+import { createSystemModule } from "../../src/modules/system/index.ts";
+import { CLEANUP_JOB_IDS, deleteInBatches, RETENTION_JOBS } from "../../src/modules/system/retention.ts";
+import { budgetLevel, resetDirScans } from "../../src/modules/system/storage.ts";
+import { bearer, createHarness, type Harness, pgAvailable } from "../auth-settings/harness.ts";
+import { DEV_KEY, json } from "../helpers.ts";
+
+// CACHE-2 存储预算与保留:保留清理分批与边界、存储面板形状、health 存储档位、手动触发清理。
+
+const hasPg = await pgAvailable();
+const DAY = 86_400_000;
+
+describe("预算档位", () => {
+  it("≥ 预算 critical,≥ 告警线 warn,取不到 unknown", () => {
+    expect(budgetLevel(null, 100, 80)).toBe("unknown");
+    expect(budgetLevel(79, 100, 80)).toBe("ok");
+    expect(budgetLevel(80, 100, 80)).toBe("warn");
+    expect(budgetLevel(100, 100, 80)).toBe("critical");
+  });
+
+  it("每个清理目标都对应一个定时任务", () => {
+    expect(Object.keys(CLEANUP_JOB_IDS).sort()).toEqual(
+      [
+        "observation",
+        "sse_event",
+        "heartbeat",
+        "task_run",
+        "agent_event",
+        "audit",
+        "capability_stats",
+        "identity_pool",
+        "analyze",
+        "images",
+        "kv_cache",
+      ].sort(),
+    );
+  });
+});
+
+describe.skipIf(!hasPg)("CACHE-2 存储(真实 PG)", () => {
+  let h: Harness;
+  let admin: ReturnType<typeof bearer>;
+  const dir = mkdtempSync(join(tmpdir(), "umt-cache2-"));
+
+  beforeAll(async () => {
+    h = await createHarness({ engine: true });
+    const { createApp } = await import("../../src/http/app.ts");
+    const { createAuthSettingsModule } = await import("../../src/modules/auth-settings/index.ts");
+    const sys = createSystemModule({
+      engineSchema: h.engineSchema,
+      apiHeartbeat: false,
+      storagePaths: { dataDir: dir, sessionDir: join(dir, "agent-sessions") },
+      retentionBatch: { batchSize: 3, pauseMs: 0 },
+      healthDeps: {
+        dataDir: dir,
+        diskUsage: async (path) => ({
+          status: "ok",
+          path,
+          totalBytes: 1000,
+          freeBytes: 500,
+          availableBytes: 500,
+          usedBytes: 500,
+          usedRatio: 0.5,
+        }),
+      },
+    });
+    h.app = createApp({
+      config: h.ctx.config,
+      logger: h.ctx.logger,
+      bus: h.bus,
+      db: h.db,
+      role: "all",
+      version: "0.0.0-test",
+      modules: [createAuthSettingsModule({ setupTokenOnStart: false, engineSchema: h.engineSchema }), sys],
+      ctx: h.ctx,
+    }) as Harness["app"];
+    admin = bearer(h.app, DEV_KEY);
+    await sys.start?.(h.ctx);
+    // 目录:图片 3 KB、备份 2 份、会话 1 KB、证据 1 KB
+    mkdirSync(join(dir, "cache", "images", "t", "p", "w92"), { recursive: true });
+    writeFileSync(join(dir, "cache", "images", "t", "p", "w92", "a.jpg"), new Uint8Array(3072));
+    for (const b of ["20260901T000000Z", "20260902T000000Z", ".20260903T000000Z.partial"]) {
+      mkdirSync(join(dir, "backups", b), { recursive: true });
+      writeFileSync(join(dir, "backups", b, "db.dump"), new Uint8Array(1024));
+    }
+    mkdirSync(join(dir, "agent-sessions"), { recursive: true });
+    writeFileSync(join(dir, "agent-sessions", "s.jsonl"), new Uint8Array(1024));
+    mkdirSync(join(dir, "tmp", "evidence"), { recursive: true });
+    writeFileSync(join(dir, "tmp", "evidence", "e.jpg"), new Uint8Array(1024));
+    resetDirScans();
+  }, 60_000);
+  afterAll(async () => {
+    await h?.close();
+    rmSync(dir, { recursive: true, force: true });
+  });
+
+  const job = (target: string) => {
+    const j = RETENTION_JOBS.find((x) => x.target === target)!;
+    return (now = new Date(), settings = DEFAULT_STORAGE_SETTINGS) =>
+      j.run({ db: h.db, engineSchema: h.engineSchema, settings, now, batch: { batchSize: 3, pauseMs: 0 } });
+  };
+  const count = async (q: RawBuilder<{ n: number }>) => Number((await q.execute(h.db)).rows[0]!.n);
+
+  it("保留任务登记在维护组,各自一个 key", () => {
+    const reg = scheduleRegistry(h.ctx);
+    for (const j of RETENTION_JOBS) {
+      expect(reg.get(j.jobId)?.defaults, j.jobId).toMatchObject({ group: "maintain" });
+    }
+    expect(reg.get("storage.analyze")?.defaults.schedule).toMatchObject({ everyMs: 7 * DAY });
+    expect(reg.get("system.heartbeat_cleanup")?.defaults.group).toBe("maintain");
+  });
+
+  it("deleteInBatches:按批删除,只删满足条件的行;总时限到了停在中途,下次接着删", async () => {
+    await sql`insert into sse_event (type, at) select 'x', now() - interval '30 days' from generate_series(1, 10)`.execute(
+      h.db,
+    );
+    await sql`insert into sse_event (type, at) values ('keep', now())`.execute(h.db);
+    // 时钟每次调用前进 1 秒,预算 1.5 秒:删完 2 批就停
+    let t = 0;
+    const r1 = await deleteInBatches(h.db, sql.raw("sse_event"), sql`at < now() - interval '7 days'`, {
+      batchSize: 3,
+      pauseMs: 0,
+      budgetMs: 1500,
+      now: () => (t += 1000),
+    });
+    expect(r1).toEqual({ deleted: 6, batches: 2, truncated: true });
+    const r2 = await deleteInBatches(h.db, sql.raw("sse_event"), sql`at < now() - interval '7 days'`, {
+      batchSize: 3,
+      pauseMs: 0,
+    });
+    expect(r2).toEqual({ deleted: 4, batches: 2, truncated: false });
+    expect(await count(sql<{ n: number }>`select count(*)::int as n from sse_event`)).toBe(1);
+  });
+
+  it("每批语句超时:停止本次运行,不抛错", async () => {
+    await sql`insert into sse_event (type, at) values ('slow', now() - interval '30 days')`.execute(h.db);
+    const r = await deleteInBatches(
+      h.db,
+      sql.raw("sse_event"),
+      sql`at < now() - interval '7 days' and pg_sleep(0.3) is not null`,
+      { batchSize: 3, statementTimeoutMs: 50 },
+    );
+    expect(r).toEqual({ deleted: 0, batches: 0, truncated: true });
+    await sql`delete from sse_event where type = 'slow'`.execute(h.db);
+  });
+
+  it("观察记录:保留边界(90 天前一刻删,之后保留)", async () => {
+    const feed = (
+      await sql<{
+        id: string;
+      }>`insert into feed_source (name, url_display) values ('rss', 'https://x/rss') returning id`.execute(h.db)
+    ).rows[0]!.id;
+    const now = new Date();
+    const ins = (guid: string, at: Date) =>
+      sql`insert into observation (feed_id, guid, content_digest, title, created_at)
+        values (${feed}, ${guid}, ${guid}, ${guid}, ${at})`.execute(h.db);
+    for (let i = 0; i < 5; i++) await ins(`old${i}`, new Date(now.getTime() - 90 * DAY - 60_000 - i));
+    await ins("edge", new Date(now.getTime() - 90 * DAY + 60_000));
+    await ins("new", now);
+    expect(await job("observation")(now)).toMatch(/删除 5 行（2 批）/);
+    const left = await sql<{ guid: string }>`select guid from observation order by guid`.execute(h.db);
+    expect(left.rows.map((r) => r.guid)).toEqual(["edge", "new"]);
+  });
+
+  it("任务运行:只删过期且已结束的业务任务与引擎 run", async () => {
+    const now = new Date();
+    const old = new Date(now.getTime() - 61 * DAY);
+    const ins = (key: string, status: string, at: Date) =>
+      sql`insert into task (kind, idempotency_key, status, created_at) values ('k', ${key}, ${status}, ${at})`.execute(
+        h.db,
+      );
+    await ins("t1", "succeeded", old);
+    await ins("t2", "failed", old);
+    await ins("t3", "running", old);
+    await ins("t4", "succeeded", now);
+    const t = (n: string) => sql.raw(`"${h.engineSchema}".${n}`);
+    const run = (id: string, status: string, at: Date) =>
+      sql`insert into ${t("workflow_runs")} (namespace_id, id, workflow_name, version, status, config, attempts, created_at, updated_at)
+        values ('default', ${id}, 'w', 'v1', ${status}, '{}'::jsonb, 1, ${at}, ${at})`.execute(h.db);
+    await run("r-old-done", "completed", old);
+    await run("r-old-running", "running", old);
+    await run("r-new", "completed", now);
+    expect(await job("task_run")(now)).toMatch(/业务任务 2、引擎 run 1/);
+    expect(
+      (await sql<{ idempotency_key: string }>`select idempotency_key from task order by 1`.execute(h.db)).rows.map(
+        (r) => r.idempotency_key,
+      ),
+    ).toEqual(["t3", "t4"]);
+    expect(
+      (await sql<{ id: string }>`select id from ${t("workflow_runs")} order by id`.execute(h.db)).rows.map((r) => r.id),
+    ).toEqual(expect.arrayContaining(["r-old-running", "r-new"]));
+    expect(
+      await count(sql<{ n: number }>`select count(*)::int as n from ${t("workflow_runs")} where id = 'r-old-done'`),
+    ).toBe(0);
+  });
+
+  it("Agent 事件:只删已结束会话里过期的事件;审计与能力统计分开保留", async () => {
+    const now = new Date();
+    const runs = await sql<{ id: string; status: string }>`insert into agent_run (trigger, goal, status)
+      values ('user', 'g', 'succeeded'), ('user', 'g', 'running') returning id, status`.execute(h.db);
+    const done = runs.rows.find((r) => r.status === "succeeded")!.id;
+    const live = runs.rows.find((r) => r.status === "running")!.id;
+    const old = new Date(now.getTime() - 91 * DAY);
+    await sql`insert into agent_run_event (run_id, seq, type, at) values
+      (${done}, 1, 'run_started', ${old}), (${done}, 2, 'run_started', ${now}), (${live}, 1, 'run_started', ${old})`.execute(
+      h.db,
+    );
+    expect(await job("agent_event")(now)).toMatch(/Agent 事件 1、/);
+    expect(await count(sql<{ n: number }>`select count(*)::int as n from agent_run_event`)).toBe(2);
+
+    await sql`delete from audit_event`.execute(h.db);
+    const a = (days: number, targetType: string | null) =>
+      sql`insert into audit_event (actor_type, action, target_type, at)
+        values ('system', 'x', ${targetType}, ${new Date(now.getTime() - days * DAY)})`.execute(h.db);
+    await a(181, null);
+    await a(179, null);
+    await a(100, "capability");
+    await a(80, "capability");
+    await a(181, "capability");
+    expect(await job("audit")(now)).toMatch(/审计事件删除 1 行/);
+    expect(await job("capability_stats")(now)).toMatch(/能力审计 2、/);
+    const left = await sql<{ t: string | null; d: number }>`select target_type as t,
+        round(extract(epoch from now() - at) / 86400)::int as d from audit_event order by d`.execute(h.db);
+    expect(left.rows).toEqual([
+      { t: "capability", d: 80 },
+      { t: null, d: 179 },
+    ]);
+  });
+
+  it("待识别池:unmatched 超过保留期没有新证据的归档,其余不动", async () => {
+    const site = (
+      await sql<{ id: string }>`insert into site (key, name, adapter, base_url)
+        values ('s-cache2', 'S', 'nexusphp', 'https://s.example') returning id`.execute(h.db)
+    ).rows[0]!.id;
+    const now = new Date();
+    const cand = async (rid: string, reason: string, lastAttemptDays: number) => {
+      const sr = (
+        await sql<{ id: string }>`insert into source_release (site_id, site_release_id, title)
+          values (${site}, ${rid}, ${rid}) returning id`.execute(h.db)
+      ).rows[0]!.id;
+      await sql`insert into identity_candidate (source_release_id, reason, evidence_version, last_attempt_at)
+        values (${sr}, ${reason}, 'v1', ${new Date(now.getTime() - lastAttemptDays * DAY)})`.execute(h.db);
+    };
+    await cand("r1", "unmatched", 31);
+    await cand("r2", "unmatched", 29);
+    await cand("r3", "ambiguous", 31);
+    expect(await job("identity_pool")(now)).toBe("归档 1 条待识别条目");
+    const st = await sql<{ t: string; s: string }>`select sr.title as t, c.status as s from identity_candidate c
+      join source_release sr on sr.id = c.source_release_id order by sr.title`.execute(h.db);
+    expect(st.rows).toEqual([
+      { t: "r1", s: "archived" },
+      { t: "r2", s: "pending" },
+      { t: "r3", s: "pending" },
+    ]);
+  });
+
+  it("ANALYZE 任务", async () => {
+    expect(await job("analyze")()).toMatch(/ANALYZE 完成/);
+  });
+
+  it("GET /system/storage:表体积 top 15、库体积对照预算、kv_cache、目录用量、清理任务", async () => {
+    await sql`insert into kv_cache (region, key, value, expires_at) values
+      ('tmdb.request', 'a', '{}'::jsonb, now() + interval '1 day'),
+      ('tmdb.request', 'b', '{}'::jsonb, now() - interval '1 day')`.execute(h.db);
+    const res = await admin("GET", "/system/storage");
+    expect(res.status).toBe(200);
+    const d = SystemStorage.parse((await json(res)).data);
+    expect(d.db.tables.length).toBeGreaterThan(0);
+    expect(d.db.tables.length).toBeLessThanOrEqual(15);
+    expect(d.db.usedBytes).toBeGreaterThan(0);
+    expect(d.db.budgetBytes).toBe(25 * 1024 ** 3);
+    expect(d.db.warnBytes).toBe(20 * 1024 ** 3);
+    expect(d.kvCache.find((r) => r.region === "tmdb.request")).toMatchObject({ entries: 2, expired: 1 });
+    expect(d.images).toMatchObject({ usedBytes: 3072, files: 1, level: "ok", budgetBytes: 20 * 1024 ** 3 });
+    expect(d.backups).toMatchObject({ usedBytes: 3072, count: 2, level: "ok" });
+    expect(d.sessionsEvidence).toMatchObject({ usedBytes: 2048, level: "ok" });
+    expect(d.dataDir.map((x) => x.name)).toEqual(
+      expect.arrayContaining(["agent-sessions", "backups", "cache/images", "tmp/evidence"]),
+    );
+    const obs = d.cleanup.find((c) => c.target === "observation")!;
+    expect(obs).toMatchObject({ jobId: "storage.retention.observation", retention: "90 天" });
+    expect(d.cleanup.find((c) => c.target === "heartbeat")?.retention).toBe("24 小时");
+    expect(d.level).toBe("ok");
+  });
+
+  it("预算超了:存储面板与 health 都报出来", async () => {
+    const r = await admin("PATCH", "/settings", {
+      storage: { budgets: { pgDataWarnGb: 0.01, pgDataGb: 50 } },
+    });
+    expect(r.status).toBe(200);
+    // 把 PG 告警线压到库体积之下验证 db warn
+    const d = SystemStorage.parse((await json(await admin("GET", "/system/storage"))).data);
+    expect(d.db.level).toBe("warn");
+    expect(d.level).toBe("warn");
+    const hl = SystemHealth.parse((await json(await admin("GET", "/system/health"))).data);
+    expect(hl.storage.level).toBe("warn");
+    expect(hl.storage.alerts.join("")).toMatch(/数据库/);
+    expect(["warn", "critical"]).toContain(hl.level);
+    await admin("PATCH", "/settings", { storage: { budgets: { pgDataWarnGb: 20, pgDataGb: 25 } } });
+  });
+
+  it("POST /system/storage/cleanup/{target}:排入对应定时任务;重复请求合并;未知目标 422", async () => {
+    await sql`insert into scheduled_job (id, name, board_group, kind, enabled, default_enabled, schedule, default_schedule)
+      values ('storage.retention.audit', '审计清理', 'maintain', 'task', true, true,
+        '{"type":"interval","everyMs":86400000}'::jsonb, '{"type":"interval","everyMs":86400000}'::jsonb)
+      on conflict (id) do nothing`.execute(h.db);
+    const r1 = await json(await admin("POST", "/system/storage/cleanup/audit"));
+    expect(r1.data).toEqual({ target: "audit", jobId: "storage.retention.audit", queued: true });
+    const r2 = await json(await admin("POST", "/system/storage/cleanup/audit"));
+    expect(r2.data.queued).toBe(false);
+    expect((await admin("POST", "/system/storage/cleanup/nope")).status).toBe(422);
+    expect((await admin("POST", "/system/storage/cleanup/observation")).status).toBe(404);
+  });
+});
diff --git a/docker-compose.yml b/docker-compose.yml
index 4bdd7fde..d5d0acc7 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -19,6 +19,27 @@ services:
   postgres:
     image: postgres:16-alpine
     restart: unless-stopped
+    # 内存参数按 4C/8G 机器给 PG 3G 设定(CACHE-2);机器不同按 docs/runbook/storage.md「PG 参数」调整,
+    # 改 .env 里的 PG_* 后 docker compose up -d postgres 重建生效
+    command:
+      - postgres
+      - -c
+      - shared_buffers=${PG_SHARED_BUFFERS:-2GB}
+      - -c
+      - effective_cache_size=${PG_EFFECTIVE_CACHE_SIZE:-5GB}
+      - -c
+      - work_mem=${PG_WORK_MEM:-32MB}
+      - -c
+      - maintenance_work_mem=${PG_MAINTENANCE_WORK_MEM:-256MB}
+      - -c
+      - max_wal_size=${PG_MAX_WAL_SIZE:-2GB}
+    mem_limit: ${PG_MEM_LIMIT:-3g}
+    deploy:
+      resources:
+        limits:
+          memory: ${PG_MEM_LIMIT:-3g}
+    # 并行查询的动态共享内存走 /dev/shm,Docker 缺省 64MB 不够
+    shm_size: 512mb
     environment:
       POSTGRES_USER: umt
       POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:?请设置 POSTGRES_PASSWORD}
diff --git a/docker/compose.env.example b/docker/compose.env.example
index 6824b379..8e3ea749 100644
--- a/docker/compose.env.example
+++ b/docker/compose.env.example
@@ -17,6 +17,14 @@ PGID=10001
 
 # 备份保留份数(0 = 不轮转)
 BACKUP_KEEP=14
+
+# PG 内存(缺省按 4C/8G 给 PG 3G;调整方法见 docs/runbook/storage.md「PG 参数」)
+# PG_MEM_LIMIT=3g
+# PG_SHARED_BUFFERS=2GB
+# PG_EFFECTIVE_CACHE_SIZE=5GB
+# PG_WORK_MEM=32MB
+# PG_MAINTENANCE_WORK_MEM=256MB
+# PG_MAX_WAL_SIZE=2GB
 LOG_LEVEL=info
 # APP_VERSION=v0.1.0
 # 国内网络构建换源(可选):APT_MIRROR=mirrors.ustc.edu.cn
diff --git a/docs/porting/moviepilot-tmdb-cache.md b/docs/porting/moviepilot-tmdb-cache.md
index 3b385915..f649ecd3 100644
--- a/docs/porting/moviepilot-tmdb-cache.md
+++ b/docs/porting/moviepilot-tmdb-cache.md
@@ -15,7 +15,8 @@
 | `@cached(region, maxsize, ttl, skip_none, skip_empty, skip_if, empty_ttl, empty_if)` | `cachedCall(cache, key, opts, fn)` | should_cache / get_cache_ttl 逻辑逐条对应 |
 | `fresh()` 上下文 | `opts.fresh` | 跳过读、照常写 |
 
-偏离(仅存储介质):值用 JSON(jsonb)代替 pickle;过期行需要物理删除,加定时任务 `cache.sweep`(每 10 分钟);
+偏离(仅存储介质与 TTL 取值):值用 JSON(jsonb)代替 pickle;TTL 值来自 `settings.storage.cacheTtl`(CACHE-2,见 runbook/storage.md),
+追踪中的作品详情命中时续期(`PgCache.renew`,只延长);过期行需要物理删除,加定时任务 `cache.sweep`(每 10 分钟);
 PG 读写失败时 TMDB 路径按未命中处理(内存缓存不会失败)。
 
 ## TMDB 请求缓存:`tmdbv3api/tmdb.py TMDb.request` 的 `@cached` → `packages/adapters/src/tmdb/client.ts`
@@ -23,8 +24,8 @@ PG 读写失败时 TMDB 路径按未命中处理(内存缓存不会失败)。
 | 上游 | 我们 |
 |---|---|
 | `maxsize = CONF.tmdb`(256;大内存 1024) | 设置 `cache.tmdbMaxSize`(缺省 256) |
-| `ttl = CONF.meta = META_CACHE_EXPIRE 小时`(缺省 24) | 设置 `cache.tmdbTtlHours`(缺省 24) |
-| `empty_ttl = EMPTY_RESULT_CACHE_TTL`(1800 秒),`empty_if = results 为空列表` | 设置 `cache.emptyResultTtlSec`(缺省 1800);`isEmptyResult` 同判定 |
+| `ttl = CONF.meta = META_CACHE_EXPIRE 小时`(缺省 24) | CACHE-2 起按请求类别取设置:`/search/`、`/find/` 用 `storage.cacheTtl.tmdbSearchDays`(7 天),其余用 `tmdbDetailDays`(30 天) |
+| `empty_ttl = EMPTY_RESULT_CACHE_TTL`(1800 秒),`empty_if = results 为空列表` | `storage.cacheTtl.tmdbMissDays`(1 天);`isEmptyResult` 同判定 |
 | `skip_none`(连接失败不缓存)、`skip_if = success:false`(业务失败不缓存) | 这两类在 `fetchWithRetry` 抛错,不会写缓存 |
 | 键 = 函数名 + (method, url, params) | 键 = `path?query`(参数排序,不含 api_key / token) |
 | region 自动生成 | region `tmdb.request` |
@@ -39,7 +40,7 @@ PG 读写失败时 TMDB 路径按未命中处理(内存缓存不会失败)。
 | `update(meta, info)`:info 非空写正常条目(默认 ttl);`{}` 写负缓存 `{"id": 0}`(`EMPTY_RESULT_CACHE_TTL`);None 不写 | `saveRecognizeCache(meta, info)`:info / null / undefined 三态一一对应 |
 | `get(meta)` 读;类型冲突(元数据电视剧、缓存电影)删除后按未命中 | `loadRecognizeCache` 同 |
 | `update` 时类型冲突拒绝写入 | 同 |
-| `maxsize = CONF.tmdb`、`ttl = CONF.meta`,每条独立 `expires_at` | 同设置;`kv_cache.expires_at` 每条独立 |
+| `maxsize = CONF.tmdb`、`ttl = CONF.meta`,每条独立 `expires_at` | 条数同设置;正常条目 TTL 取 `tmdbSearchDays`,负缓存取 `tmdbMissDays`;`kv_cache.expires_at` 每条独立 |
 | `_restore / save`:pickle 文件持久化与恢复 | 不需要:表本身就是持久化(UNLOGGED 在 PG 崩溃时清空,等价于缓存丢失) |
 | `list_items / delete / clear` | `GET /cache/tmdb`、`POST /cache/tmdb/clear`(清空时同时清请求缓存,对应 MP `clear_cache()`) |
 | `is_redis` 分支 | 忽略 |
@@ -68,5 +69,6 @@ PG 读写失败时 TMDB 路径按未命中处理(内存缓存不会失败)。
 | `SECURITY_IMAGE_DOMAINS` 白名单 | 只代理 `image.tmdb.org`,尺寸与文件名走白名单 |
 | `clear_temp`:删除 `CACHE_PATH/images` 下 mtime 超过 `GLOBAL_IMAGE_CACHE_DAYS`(7)天的文件与空目录 | 设置 `cache.globalImageCacheDays`(缺省 7);定时任务 `cache.images_clean` 每天执行 |
 
-偏离:MP 失败时返回空响应,我们回 502(前端回退占位);MP 按配置走代理服务器,我们直连(TMDB API 也未走代理);
+偏离:MP 失败时返回空响应,我们回 502(前端回退占位);CACHE-2 加了容量 LRU(`cache.images_lru`,按 atime,预算 `storage.budgets.imagesGb`),
+按天清理保留作兜底;MP 按配置走代理服务器,我们直连(TMDB API 也未走代理);
 MP 只在启动时清理,我们改为每天一次的定时任务。
diff --git a/docs/runbook/cache.md b/docs/runbook/cache.md
index 3549c615..c6f2c610 100644
--- a/docs/runbook/cache.md
+++ b/docs/runbook/cache.md
@@ -24,11 +24,14 @@
 
 | region | 内容 | 键 | TTL | 条数上限 |
 |---|---|---|---|---|
-| `tmdb.request` | TMDB 请求响应(MP `TMDb.request`) | `path?query`(不含凭证) | `cache.tmdbTtlHours`;`results` 为空按 `cache.emptyResultTtlSec` | `cache.tmdbMaxSize` |
-| `tmdb.recognize` | TMDB 识别结果(MP `TmdbCache`) | `[类型][语言]{tmdbid 或名称}-{年份}-{季}` | 同上;未识别 `{id:0}` 按空结果 TTL | `cache.tmdbMaxSize` |
+| `tmdb.request` | TMDB 请求响应(MP `TMDb.request`) | `path?query`(不含凭证) | 搜索 / find:`storage.cacheTtl.tmdbSearchDays`(7 天);详情 / 季:`tmdbDetailDays`(30 天,追踪中的作品命中续期);`results` 为空:`tmdbMissDays`(1 天) | `cache.tmdbMaxSize` |
+| `tmdb.recognize` | TMDB 识别结果(MP `TmdbCache`) | `[类型][语言]{tmdbid 或名称}-{年份}-{季}` | `tmdbSearchDays`;未识别 `{id:0}` 按 `tmdbMissDays` | `cache.tmdbMaxSize` |
+| `site.detail` | 站点详情页扩展内容 | `source_release.id` | `max(站点详情缓存期, storage.cacheTtl.siteDetailDays)`(7 天) | 5000 |
+| `websearch` | 网页搜索结果 | 参数 sha256 | `storage.cacheTtl.webSearchDays`(1 天) | 1000 |
 
-设置(设置 → 元数据 → TMDB 缓存):`cache.tmdbTtlHours`(缺省 24,MP `META_CACHE_EXPIRE`)、`cache.tmdbMaxSize`(缺省 256,MP `CONF.tmdb`)、
-`cache.emptyResultTtlSec`(缺省 1800,MP `EMPTY_RESULT_CACHE_TTL`)。
+TTL 设置(CACHE-2 起):`settings.storage.cacheTtl`,见 [storage.md](storage.md)。MP 的 `META_CACHE_EXPIRE` 只有一个值,
+我们按请求类别拆成搜索 / 详情两档,`EMPTY_RESULT_CACHE_TTL` 对应 `tmdbMissDays`;缓存语义不变。
+条数上限仍是 `cache.tmdbMaxSize`(缺省 256,MP `CONF.tmdb`)。旧字段 `cache.tmdbTtlHours`、`cache.emptyResultTtlSec` 不再读取。
 
 API:`GET /api/v1/cache/tmdb?kind=recognize|request&limit=` 列出条目(键 / 过期 / 大小,识别条目带 tmdbId / 标题 / 海报);
 `POST /api/v1/cache/tmdb/clear` 清空两类(仅 admin)。
@@ -48,6 +51,8 @@ API:`GET /api/v1/cache/tmdb?kind=recognize|request&limit=` 列出条目(键 / 
 - 按文件头识别图片类型,非图片 / SVG 拒绝;ETag = md5(内容),`Cache-Control: public, max-age=604800`,If-None-Match 相同回 304。
 - 上游超时(20s)/ 非 200 / 非图片 → 502,前端回退无彩占位。
 - 清理:定时任务 `cache.images_clean`(每天)删除 mtime 早于 `cache.globalImageCacheDays`(缺省 7)天的文件。
+- 容量 LRU(CACHE-2):`cache.images_lru`(30 分钟)在总量超过 `storage.budgets.imagesGb`(缺省 20 GB)时按最久未访问删到 90%;
+  读盘命中会刷新文件 atime。见 [storage.md](storage.md)。
 - 用量 / 清空:`GET /api/v1/cache/images`、`POST /api/v1/cache/images/clear`(仅 admin);设置 → 元数据 → 图片代理与缓存。
 
 前端:作品库列表、作品详情、搜索面板的 TMDB 候选在有 `posterPath`(metadata.posterPath / TMDB 候选)时显示海报,
@@ -58,4 +63,5 @@ API:`GET /api/v1/cache/tmdb?kind=recognize|request&limit=` 列出条目(键 / 
 - TMDB 缓存不生效:确认 `select region, count(*) from kv_cache group by 1` 有 `tmdb.request`;PG 读写失败时按未命中处理并记
   `TMDB 缓存读写失败，按未命中处理`。
 - 改了 TMDB 缓存设置:新写入的条目按新 TTL / 上限;已有条目保持原过期时间,必要时清空。
+- TTL 拉长后条目更早被条数上限挤掉:`cache.tmdbMaxSize` 缺省只有 256,追踪作品多时调大。
 - 数据库重启后缓存为空:UNLOGGED 表的正常行为。
diff --git a/docs/runbook/ops.md b/docs/runbook/ops.md
index cca2fc3c..d9492d03 100644
--- a/docs/runbook/ops.md
+++ b/docs/runbook/ops.md
@@ -14,7 +14,8 @@
 - 每 15 秒 upsert `process_heartbeat` 一行,同时往 `process_heartbeat_sample` 追加一条采样。
 - 行主键 `instance_id = <kind>:<host>:<pid>`,容器重启覆盖同一行。
 - 正常退出(SIGTERM / SIGINT)时写入器把本行标 `stopped_at`,读取方立即归入已下线实例;重启后同一行的 upsert 把它清回 null。
-- 裁剪由定时任务 `system.heartbeat_cleanup`(维护组,1 小时)负责:24 小时没心跳的进程行删除,采样保留 7 天。
+- 裁剪由定时任务 `system.heartbeat_cleanup`(维护组,1 小时)负责:24 小时没心跳的进程行删除,采样保留
+  `storage.retentionDays.heartbeatHours`(缺省 24 小时,CACHE-2 前是 7 天)。
 - 写库失败只记 debug 日志,不影响业务。
 
 ## GET /system/health 字段
@@ -40,12 +41,13 @@
 | `mounts[]` | 库根做哨兵检查(`checkRoot`),下载目录只查目录可读。`status`:`online` / `offline` / `timeout` |
 | `engine` | 待处理 run 数、执行中 run 数、最老待处理时长、24 小时结束数 / 失败数 / 失败率 |
 | `schedules` | 定时任务总数、启用数、执行中数、最近一次失败的启用任务、24 小时失败运行数 |
+| `storage` | 存储预算档位与告警文案(PG 库体积、图片缓存、备份、会话与证据对照 `settings.storage.budgets`),明细见 `GET /system/storage`([storage.md](storage.md)) |
 
 单个路径的 statfs 或哨兵检查超过 3 秒记 `timeout`:磁盘段标 critical,挂载段标 `timeout`。请求本身不会被卡住。
 
 ## GET /system/health/history?hours=
 
-- `hours` 取 1–168,缺省 6。
+- `hours` 取 1–168,缺省 6。采样只保留 `heartbeatHours`(缺省 24 小时),更早的部分为空。
 - 按桶聚合,每条序列最多约 360 个点。桶宽最小 15 秒,168 小时时是 1680 秒。
 - 每个进程一条序列,每个点有 `lagMs`(桶内平均)、`lagMaxMs`(桶内最大)、`runningRuns`、`sseConnections`。
 
@@ -61,6 +63,8 @@
 - 最老待处理 run 等待 ≥ 5 分钟记 warn,≥ 30 分钟记 critical。通常是 worker 没起来或并发被占满。
 - 24 小时失败率 ≥ 10% 记 warn;失败率 ≥ 30% 且结束数 ≥ 10 记 critical。
 - 有启用的定时任务最近一次运行失败:warn。
+- PG 库体积 ≥ `pgDataWarnGb`(20 GB)记 warn,≥ `pgDataGb`(25 GB)记 critical;备份、会话与证据 ≥ 预算 80% 记 warn、≥ 预算记 critical;
+  图片缓存超预算 10% 记 warn。
 
 ## 引擎 runs 的业务字段
 
diff --git a/docs/runbook/schedules.md b/docs/runbook/schedules.md
index 7e87f930..0109eeac 100644
--- a/docs/runbook/schedules.md
+++ b/docs/runbook/schedules.md
@@ -30,7 +30,12 @@
 | `trash.purge` | 回收站清理 | 维护 | 24 小时 | 入队 `purgeTrash` |
 | `pi.token_refresh` | 上游登录刷新 | 维护 | 10 分钟 | 入队 `refreshPiTokens`,幂等键 `refreshPiTokens:<时间槽>`;对 30 分钟内过期的订阅登录上游刷新 token |
 | `auth.cleanup` | 登录会话清理 | 维护 | 1 小时 | 直接执行 `cleanupAuthTables`:删 7 天前的登录尝试、30 天前过期或吊销的会话 |
-| `system.heartbeat_cleanup` | 进程心跳清理 | 维护 | 1 小时 | 删 24 小时没有心跳的进程行、7 天前的心跳采样 |
+| `system.heartbeat_cleanup` | 进程心跳清理 | 维护 | 1 小时 | 删 24 小时没有心跳的进程行、超过 `storage.retentionDays.heartbeatHours`(24 小时)的心跳采样 |
+| `cache.sweep` | 缓存清理 | 维护 | 10 分钟 | 删 kv_cache 过期行 |
+| `cache.images_clean` | 图片缓存清理 | 维护 | 24 小时 | 删超过保留天数的图片 |
+| `cache.images_lru` | 图片缓存容量控制 | 维护 | 30 分钟 | 超过 `storage.budgets.imagesGb` 按最久未访问删到 90% |
+| `storage.retention.*` | 保留清理(观察 / SSE / 任务运行 / Agent 事件 / 审计 / 能力统计 / 待识别池归档) | 维护 | 1–24 小时 | 分批删除超过保留期的流水数据,见 [storage.md](storage.md) |
+| `storage.analyze` | 统计信息更新 | 维护 | 7 天 | 全库 `ANALYZE` |
 | `maintain.backup` | 备份 | 维护 | 每天 03:30(占位) | 未配置。备份目前由宿主机上的 `scripts/backup.sh` 执行 |
 | `check.pending` | 待处理巡检 | Agent | 6 小时，默认关闭 | 只读。有未关闭事项时才会运行 |
 | `check.downloads` | 下载诊断 | Agent | 2 小时，默认关闭 | 默认只读。打开 `allowRecover` 后，在授权范围内重试或重新校验 |
diff --git a/docs/runbook/storage.md b/docs/runbook/storage.md
new file mode 100644
index 00000000..fa79de6f
--- /dev/null
+++ b/docs/runbook/storage.md
@@ -0,0 +1,149 @@
+# 存储预算与保留(CACHE-2)
+
+按 4C / 8G / 100G 的机器分配:PG ≤ 25 GB(20 GB 告警)、图片缓存 20 GB、备份 20 GB(14 份)、会话与证据 10 GB。
+流水数据按保留期定时分批删除,缓存有效期延长,容量不够时按 LRU 淘汰。本轮只有后端与配置,设置页 UI 后续接。
+
+## 设置 `settings.storage`
+
+三组,都在「设置 → 自动化 → 存储与保留」(分区锚点 `storage`,UI 待接)。PATCH 可以只给子字段:
+
+```sh
+PATCH /api/v1/settings {"storage":{"retentionDays":{"observation":60}}}
+```
+
+| 字段 | 缺省 | 说明 |
+|---|---|---|
+| `budgets.pgDataGb` / `pgDataWarnGb` | 25 / 20 | PG 库体积(`pg_database_size`,不含 WAL)。≥ 告警线 warn,≥ 预算 critical |
+| `budgets.imagesGb` | 20 | 图片代理缓存容量。超出由 `cache.images_lru` 按最久未访问删到 90% |
+| `budgets.backupsGb` | 20 | `DATA_DIR/backups`。≥ 80% warn,≥ 预算 critical。份数仍由 `BACKUP_KEEP` 控制 |
+| `budgets.sessionsEvidenceGb` | 10 | Agent 会话目录 + `DATA_DIR/tmp/evidence`。≥ 80% warn,≥ 预算 critical |
+| `retentionDays.observation` | 90 | Feed 观察记录 |
+| `retentionDays.sseEvent` | 7 | SSE 补读事件(发布方另按条数裁剪 10000 条) |
+| `retentionDays.heartbeatHours` | 24 | 进程心跳采样(小时)。历史曲线最多只能看这么久 |
+| `retentionDays.taskRun` | 60 | 已结束的业务任务 `task`、引擎 run(步骤级联)、运行元数据 |
+| `retentionDays.agentEvent` | 90 | 已结束会话的事件流与已消费消息。`agent_run` 本身保留 |
+| `retentionDays.audit` | 180 | 审计事件(能力调用审计除外) |
+| `retentionDays.capabilityStats` | 90 | 能力调用审计(`target_type=capability`)与已结束的 `capability_invocation` |
+| `retentionDays.identityPoolArchive` | 30 | 待识别池 unmatched 条目无新证据多少天后归档(不删) |
+| `cacheTtl.tmdbSearchDays` | 7 | TMDB `/search/*`、`/find/*` 响应与识别缓存 |
+| `cacheTtl.tmdbDetailDays` | 30 | TMDB 详情 / 季。追踪中的作品命中时续期 |
+| `cacheTtl.tmdbMissDays` | 1 | TMDB 空结果与未识别负缓存 |
+| `cacheTtl.siteDetailDays` | 7 | 站点详情页扩展内容(`kv_cache` `site.detail`) |
+| `cacheTtl.webSearchDays` | 1 | 网页搜索结果 |
+
+被取代的旧字段(保留在 schema 里兼容已存 JSON,服务端不再读取,已列入 `DEPRECATED_SETTINGS_FIELDS`):
+`cache.tmdbTtlHours` → `cacheTtl.tmdbSearchDays / tmdbDetailDays`,`cache.emptyResultTtlSec` → `cacheTtl.tmdbMissDays`,
+`identity.poolArchiveDays` → `retentionDays.identityPoolArchive`。设置页「元数据」里这三项接 UI 时要换成新字段。
+`cache.tmdbMaxSize`(条数上限,缺省 256)仍然有效。TTL 拉长后条数上限会先起作用,需要时调大。
+
+## 缓存有效期
+
+只改 TTL 的取值来源,缓存语义还是对照 MP(见 [porting/moviepilot-tmdb-cache.md](../porting/moviepilot-tmdb-cache.md))。
+
+- TMDB 请求缓存:键以 `/search/` 或 `/find/` 开头的用搜索 TTL,其余用详情 TTL。`results` 为空的用未命中 TTL。
+- TMDB 识别缓存:正常条目用搜索 TTL(识别结果就是名称到条目的映射),负缓存 `{id:0}` 用未命中 TTL。
+- 追踪中的作品续期:作品有未结束的订阅(active / paused / pending)且有已接受的 TMDB 身份,
+  它的详情键(`/movie/<id>?…`、`/tv/<id>…`)命中时把过期时间推到「现在 + 详情 TTL」,只延长不缩短。追踪集合每进程缓存 5 分钟。
+- 站点详情:`kv_cache` TTL 取 `max(站点详情缓存期, siteDetailDays)`。是否重抓仍按站点详情缓存期
+  (`sites.defaultDetailCacheSec`,站点定义可更长)判断,下载前复核促销和 H&R 走的是这条。
+- 改了 TTL:新写入的条目按新值,已有条目保持原过期时间。
+
+## 图片缓存容量 LRU
+
+- 读盘命中时把文件 atime 显式写成当前时间(`utimes`,不依赖挂载的 relatime),mtime 不动。
+- `cache.images_lru`(维护组,30 分钟):总量超过 `imagesGb` 时按 atime 从旧到新删到预算的 90%;没超不动。
+- `cache.images_clean`(每天,MP `clear_temp`)照旧按 mtime 删超过 `cache.globalImageCacheDays` 天的文件,作兜底。
+- 存储面板里图片超过预算 10% 才告警(说明 LRU 没跟上),不给 critical。
+
+## 保留清理任务
+
+都在维护组,开关和周期在定时任务看板改。首次登记在一个周期后才第一次运行。
+
+| key | 目标 | 默认周期 | 删除条件 |
+|---|---|---|---|
+| `storage.retention.observation` | `observation` | 6 小时 | `created_at` 早于保留期 |
+| `storage.retention.sse_event` | `sse_event` | 1 小时 | `at` 早于保留期 |
+| `system.heartbeat_cleanup` | 心跳 | 1 小时 | 进程行 24 小时无心跳;采样早于 `heartbeatHours` |
+| `storage.retention.task_run` | `task`、引擎 `workflow_runs`、`tasks_run_meta` / `tasks_fact` / `tasks_op_ledger` | 6 小时 | 早于保留期且已结束(task:succeeded / failed / cancelled / dead;run:completed / succeeded / failed / canceled;账本只删 succeeded) |
+| `storage.retention.agent_event` | `agent_run_event`、`agent_run_message` | 6 小时 | 早于保留期且会话已结束;消息只删已消费的 |
+| `storage.retention.audit` | `audit_event` | 1 天 | `at` 早于保留期,`target_type` 不是 capability |
+| `storage.retention.capability_stats` | `audit_event`(capability)、`capability_invocation` | 1 天 | 早于保留期;调用记录不删 running |
+| `storage.retention.identity_pool` | `identity_candidate` | 6 小时 | pending + unmatched,`coalesce(last_attempt_at, created_at)` 早于保留期 → 改为 archived |
+| `storage.analyze` | 全库 | 7 天 | `ANALYZE` |
+| `cache.images_lru` | 图片缓存 | 30 分钟 | 见上 |
+| `cache.sweep` | `kv_cache` | 10 分钟 | 已过期 |
+
+分批删除(`modules/system/retention.ts` 的 `deleteInBatches`):
+
+- 每批 5000 行:`delete … where ctid = any(array(select ctid … where <条件> limit 5000))`,单独事务。
+- 每批 `statement_timeout` 15 秒、`lock_timeout` 3 秒。超时就结束本次运行,不算失败,摘要写「未删完，下次继续」。
+- 每次运行最多 5 分钟,批间停 50 ms。第一次上线积压多时会分几次删完。
+- 删除后空间由 autovacuum 回收复用,不会立即还给文件系统。确实要缩文件用 `pg_repack` 或停机 `VACUUM FULL`。
+
+迁移 `0050_storage_retention`:给 `observation(created_at)`、`sse_event(at)`、`audit_event(at)`、`capability_invocation(created_at)`、
+`agent_run_message(created_at)`、`tasks_fact(created_at)`、`tasks_run_meta(created_at)`、`tasks_op_ledger(started_at)` 补索引;
+按表设 autovacuum:
+
+- 追加加批量删除的大表(observation、sse_event、audit_event、agent_run_event、process_heartbeat_sample、capability_invocation、task、tasks_fact、tasks_run_meta):
+  `vacuum_scale_factor=0.05`、`analyze_scale_factor=0.02`、`vacuum_insert_scale_factor=0.1`。
+- 频繁原地更新的小表(process_heartbeat、rate_limit_bucket、scheduled_job、kv_cache、outbox_event):
+  `vacuum_scale_factor=0.02`、`vacuum_threshold=100`、`analyze_scale_factor=0.05`。
+
+查看:`select relname, reloptions from pg_class where reloptions is not null;`
+
+## API
+
+### GET /system/storage(admin)
+
+| 字段 | 含义 |
+|---|---|
+| `level` | 各项最差档:ok / warn / critical,取不到的项 unknown 不参与 |
+| `db` | 库体积对照 `pgDataGb` / `pgDataWarnGb`;`tables` 为体积前 15 的表(总 / 表 / 索引字节、估算行数、死元组、最近 autovacuum / analyze) |
+| `kvCache[]` | 每个 region 的条数、其中已过期未清理的条数、字节 |
+| `images` | 图片缓存用量、文件数、预算 |
+| `backups` | 备份目录用量、份数(不含 `.partial`)、预算 |
+| `sessionsEvidence` | 会话目录 + `tmp/evidence` 合计、预算 |
+| `dataDir[]` | DATA_DIR 一级目录用量,`cache/`、`tmp/` 再细分一层;会话目录在 DATA_DIR 外时单列 |
+| `dirsScannedAt` | 目录遍历时间。遍历结果缓存 5 分钟 |
+| `cleanup[]` | 每个清理目标:任务 key、保留期说明、开关、最近运行时间 / 状态 / 摘要、下次运行 |
+
+### POST /system/storage/cleanup/{target}(admin)
+
+`target`:`observation`、`sse_event`、`heartbeat`、`task_run`、`agent_event`、`audit`、`capability_stats`、`identity_pool`、`analyze`、`images`、`kv_cache`。
+
+和定时任务「立即执行」一样,只设置 `run_requested_at`,由调度器执行。已在排队或运行中返回 `queued:false`。
+任务还没登记(调度器没同步过)返回 404。触发成功写审计 `storage.cleanup`。
+
+### GET /system/health 的 `storage` 段
+
+`{ level, alerts[] }`,level 计入总档位。库体积实时取;目录用量只用缓存值,过期时后台刷新,本次不等
+(进程刚启动时目录项是 unknown,不参与汇总)。
+
+## PG 参数
+
+`docker-compose.yml` 的 postgres 服务按 4C / 8G 给 PG 3G 内存:
+
+| 参数 | 缺省 | 环境变量 | 经验值 |
+|---|---|---|---|
+| 容器内存上限 | 3g | `PG_MEM_LIMIT` | 机器内存的 35–40% |
+| `shared_buffers` | 2GB | `PG_SHARED_BUFFERS` | 容器上限的 60–70%(不超过机器内存的 25–30%) |
+| `effective_cache_size` | 5GB | `PG_EFFECTIVE_CACHE_SIZE` | 机器内存的 60–70%(只影响规划,不占内存) |
+| `work_mem` | 32MB | `PG_WORK_MEM` | 每个排序 / 哈希一份,连接多时调小 |
+| `maintenance_work_mem` | 256MB | `PG_MAINTENANCE_WORK_MEM` | VACUUM / 建索引用 |
+| `max_wal_size` | 2GB | `PG_MAX_WAL_SIZE` | 批量删除时减少检查点 |
+
+另外 `shm_size: 512mb`(并行查询的动态共享内存走 /dev/shm)。
+
+按机器调整,例如 2C/4G:`PG_MEM_LIMIT=1536m PG_SHARED_BUFFERS=768MB PG_EFFECTIVE_CACHE_SIZE=2GB PG_WORK_MEM=16MB PG_MAINTENANCE_WORK_MEM=128MB`;
+8C/16G:`PG_MEM_LIMIT=6g PG_SHARED_BUFFERS=4GB PG_EFFECTIVE_CACHE_SIZE=10GB PG_WORK_MEM=64MB PG_MAINTENANCE_WORK_MEM=512MB`。
+写进 `.env` 后 `docker compose up -d postgres` 重建容器生效(数据在卷里,不丢)。确认:`docker compose exec postgres psql -U umt -c 'show shared_buffers'`。
+
+`shared_buffers` 大于容器上限会在启动时 OOM,两者一起改。
+
+## 常见问题
+
+- 面板上 PG 超预算:先看 `tables` 前几名。流水表大就临时调短对应保留期,再 `POST /system/storage/cleanup/<target>`;
+  死元组多说明 autovacuum 跟不上,可手动 `VACUUM (VERBOSE) <表>`。
+- 清理摘要一直是「未删完」:积压太多,每次 5 分钟删不完。可以把任务周期临时调短,或在低峰期多触发几次。
+- 图片缓存一直 warn:LRU 任务是否启用、最近一次是否失败;磁盘上是否有大量 `.tmp` 残留(不计入用量,可手动删)。
+- 历史曲线只能看 24 小时:这是 `heartbeatHours` 的缺省,要看更久就调大。
diff --git a/docs/runbook/websearch.md b/docs/runbook/websearch.md
index d32a51f8..8ca3df98 100644
--- a/docs/runbook/websearch.md
+++ b/docs/runbook/websearch.md
@@ -34,7 +34,7 @@ curl -X POST -H "authorization: Bearer $KEY" -H 'content-type: application/json'
 - 请求 `GET https://api.search.brave.com/res/v1/web/search`,头 `X-Subscription-Token`,参数 q / count / country / search_lang / safesearch / freshness,超时 10 s。
 - 错误分类:401/403 → auth,402 → quota,429 → rate(读 `X-RateLimit-Reset` / `Retry-After`),400/422 → bad_request,5xx → upstream,连接失败 → network,超时 → timeout。错误信息里不带 Key。
 - 结果归一化为 `{ title, url, snippet, age, source }`:去 HTML 标签、解码实体、脱敏(URL 参数里的 passkey / token 等换成 `[REDACTED]`)、截断(标题 200 字、摘要 500 字),丢弃非 http(s) 链接。
-- 缓存:`kv_cache` region `websearch`,key 是 (provider, 查询词, 条数, 地区, 语言, 安全搜索, freshness) 的 sha256,TTL 10 分钟,上限 1000 条(TLRU,同 MP 语义)。过期行由 `cache.sweep` 清理。
+- 缓存:`kv_cache` region `websearch`,key 是 (provider, 查询词, 条数, 地区, 语言, 安全搜索, freshness) 的 sha256,TTL 取 `storage.cacheTtl.webSearchDays`(缺省 1 天,CACHE-2 前是 10 分钟),上限 1000 条(TLRU,同 MP 语义)。过期行由 `cache.sweep` 清理。
 - 输出 `{ trust: "untrusted", notice, query, results, cached }`,进入模型上下文前 Pi runtime 再整体过一遍 `redactForModel`。
 
 ## web.fetch
diff --git a/packages/adapters/src/tmdb/client.ts b/packages/adapters/src/tmdb/client.ts
index 78abe02a..93c415b3 100644
--- a/packages/adapters/src/tmdb/client.ts
+++ b/packages/adapters/src/tmdb/client.ts
@@ -98,8 +98,11 @@ export interface TmdbConfig {
   maxRetryAfterMs?: number;
   maxConcurrent?: number;
   minIntervalMs?: number;
-  /** 默认 max 1024、ttl 24h;空结果(搜索 0 条)用 emptyTtlMs,默认 30min(对照 MP EMPTY_RESULT_CACHE_TTL) */
-  cache?: { max?: number; ttlMs?: number; emptyTtlMs?: number };
+  /**
+   * 默认 max 1024、ttl 24h;空结果(搜索 0 条)用 emptyTtlMs,默认 30min(对照 MP EMPTY_RESULT_CACHE_TTL);
+   * searchTtlMs:/search/、/find/ 请求的 TTL(缺省同 ttlMs),其余(详情 / 季)用 ttlMs。
+   */
+  cache?: { max?: number; ttlMs?: number; searchTtlMs?: number; emptyTtlMs?: number };
   /**
    * 跨进程共享的请求缓存(服务端传 PG 缓存);给了就不再用进程内 LRU。
    * 语义对照 MP @cached(skip_none、业务失败不缓存、results 为空按 emptyTtlMs)。
@@ -164,6 +167,8 @@ export class TmdbClient {
     for (const k of Object.keys(params).sort()) if (params[k] !== undefined) qs.set(k, params[k]!);
     const key = `${path}?${qs}`;
     const emptyTtl = this.cfg.cache?.emptyTtlMs ?? 30 * 60_000;
+    const baseTtl = this.cfg.cache?.ttlMs ?? 24 * 3600_000;
+    const ttl = /^\/(search|find)\//.test(path) ? (this.cfg.cache?.searchTtlMs ?? baseTtl) : baseTtl;
     if (this.cfg.sharedCache) {
       const shared = this.cfg.sharedCache;
       const hit = await shared.get(key);
@@ -171,14 +176,14 @@ export class TmdbClient {
       // 网络错误 / 业务失败在 fetchWithRetry 抛出,不会走到写缓存(MP skip_none / skip_if)
       const v = await this.limiter.run(() => this.fetchWithRetry(path, qs));
       if (v !== null && v !== undefined) {
-        await shared.set(key, v, isEmptyResult(v) ? emptyTtl : (this.cfg.cache?.ttlMs ?? 24 * 3600_000));
+        await shared.set(key, v, isEmptyResult(v) ? emptyTtl : ttl);
       }
       return v as T;
     }
     return this.cache.getOrLoad(
       key,
       () => this.limiter.run(() => this.fetchWithRetry(path, qs)),
-      (v) => (isEmptyResult(v) ? emptyTtl : undefined),
+      (v) => (isEmptyResult(v) ? emptyTtl : ttl === baseTtl ? undefined : ttl),
     ) as Promise<T>;
   }
 
diff --git a/packages/contracts/src/api.ts b/packages/contracts/src/api.ts
index ed7521bf..89310e37 100644
--- a/packages/contracts/src/api.ts
+++ b/packages/contracts/src/api.ts
@@ -2017,6 +2017,21 @@ export const Api = {
       query: ops.SystemHealthHistoryQuery,
       response: ops.SystemHealthHistory,
     }),
+    storage: ep({
+      method: "get",
+      path: "/system/storage",
+      scope: "admin",
+      summary: "存储：表体积前 15、库总体积、各缓存用量与预算、备份占用、DATA_DIR 分目录用量、清理任务状态",
+      response: ops.SystemStorage,
+    }),
+    storageCleanup: ep({
+      method: "post",
+      path: "/system/storage/cleanup/{target}",
+      scope: "admin",
+      summary: "立即执行某个存储清理任务（排入对应定时任务，已在排队或运行中则合并）",
+      params: ops.StorageCleanupParam,
+      response: ops.StorageCleanupResult,
+    }),
   },
 
   // ── 引擎面板(仅 admin) ──
diff --git a/packages/contracts/src/ops.ts b/packages/contracts/src/ops.ts
index 3314c140..071811fd 100644
--- a/packages/contracts/src/ops.ts
+++ b/packages/contracts/src/ops.ts
@@ -481,9 +481,110 @@ export const SystemHealth = z.object({
     ),
     failedRuns24h: NonNegInt,
   }),
+  /** 存储预算(CACHE-2):PG 库体积、图片缓存、备份、会话与证据对照 settings.storage.budgets;明细见 GET /system/storage */
+  storage: z.object({
+    level: HealthLevel,
+    /** 超出告警线 / 预算的项(人读文案) */
+    alerts: z.array(z.string()),
+  }),
 });
 export type SystemHealth = z.infer<typeof SystemHealth>;
 
+// ── 存储预算与保留(CACHE-2;GET /system/storage、POST /system/storage/cleanup/{target},仅 admin) ──
+
+/** 手动触发的清理目标;每个对应一个维护组定时任务 */
+export const StorageCleanupTarget = z.enum([
+  "observation",
+  "sse_event",
+  "heartbeat",
+  "task_run",
+  "agent_event",
+  "audit",
+  "capability_stats",
+  "identity_pool",
+  "analyze",
+  "images",
+  "kv_cache",
+]);
+export type StorageCleanupTarget = z.infer<typeof StorageCleanupTarget>;
+export const StorageCleanupParam = z.object({ target: StorageCleanupTarget });
+export const StorageCleanupResult = z.object({
+  target: StorageCleanupTarget,
+  /** 对应的定时任务 key */
+  jobId: z.string(),
+  /** false = 已在排队或运行中(请求被合并) */
+  queued: z.boolean(),
+});
+export type StorageCleanupResult = z.infer<typeof StorageCleanupResult>;
+
+/** 一项占用对照预算 */
+export const StorageBudgetUsage = z.object({
+  usedBytes: NonNegInt.nullable(),
+  /** 预算(critical 线);无预算为 null */
+  budgetBytes: NonNegInt.nullable(),
+  /** 告警线;无单独告警线时为预算的 80% */
+  warnBytes: NonNegInt.nullable(),
+  level: HealthLevel,
+  error: z.string().nullable(),
+});
+export type StorageBudgetUsage = z.infer<typeof StorageBudgetUsage>;
+
+export const SystemStorage = z.object({
+  /** 各项最差档(unknown 不参与) */
+  level: HealthLevel,
+  checkedAt: Timestamp,
+  /** 目录用量的统计时间(目录遍历结果缓存 5 分钟) */
+  dirsScannedAt: Timestamp.nullable(),
+  db: StorageBudgetUsage.extend({
+    /** 体积前 15 的表(含索引与 TOAST) */
+    tables: z.array(
+      z.object({
+        schema: z.string(),
+        name: z.string(),
+        totalBytes: NonNegInt,
+        tableBytes: NonNegInt,
+        indexBytes: NonNegInt,
+        /** 估算行数(pg_class.reltuples);未 ANALYZE 为 null */
+        rowsEstimate: NonNegInt.nullable(),
+        deadRows: NonNegInt.nullable(),
+        lastAutovacuumAt: Timestamp.nullable(),
+        lastAnalyzeAt: Timestamp.nullable(),
+      }),
+    ),
+  }),
+  /** PG kv_cache 各 region(条数含未清理的过期行) */
+  kvCache: z.array(z.object({ region: z.string(), entries: NonNegInt, expired: NonNegInt, bytes: NonNegInt })),
+  images: StorageBudgetUsage.extend({ files: NonNegInt.nullable() }),
+  backups: StorageBudgetUsage.extend({ count: NonNegInt.nullable() }),
+  sessionsEvidence: StorageBudgetUsage,
+  /** DATA_DIR 下各一级目录(cache 再细分一层)的用量 */
+  dataDir: z.array(
+    z.object({
+      name: z.string(),
+      path: z.string(),
+      usedBytes: NonNegInt,
+      files: NonNegInt,
+      error: z.string().nullable(),
+    }),
+  ),
+  /** 各清理任务的当前设置与最近运行 */
+  cleanup: z.array(
+    z.object({
+      target: StorageCleanupTarget,
+      jobId: z.string(),
+      /** 保留期说明(如 "90 天"、"24 小时"、"容量 20 GB") */
+      retention: z.string().nullable(),
+      /** 定时任务不存在(未登记 / 调度器未同步)时为 null */
+      enabled: z.boolean().nullable(),
+      lastRunAt: Timestamp.nullable(),
+      lastStatus: z.string().nullable(),
+      lastSummary: z.string().nullable(),
+      nextRunAt: Timestamp.nullable(),
+    }),
+  ),
+});
+export type SystemStorage = z.infer<typeof SystemStorage>;
+
 export const SystemHealthHistoryQuery = z.object({
   /** 回看小时数,1–168,缺省 6 */
   hours: z.coerce.number().int().min(1).max(168).default(6),
diff --git a/packages/contracts/src/settings.ts b/packages/contracts/src/settings.ts
index 4b459a7b..ff40acbd 100644
--- a/packages/contracts/src/settings.ts
+++ b/packages/contracts/src/settings.ts
@@ -24,11 +24,14 @@ const CacheShape = z.object({
   checkIntervalSec: z.number().int().min(10).max(3600),
   /** 缓存清理的目标使用率(低水位) */
   cleanupTargetPercent: Percent,
-  /** TMDB 缓存(请求响应 + 识别结果)保留小时数(对照 MP META_CACHE_EXPIRE,缺省 24) */
+  /**
+   * @deprecated CACHE-2 起由 storage.cacheTtl(tmdbSearchDays / tmdbDetailDays)取代,服务端不再读取;
+   * 保留在 schema 里只为兼容已存的 JSON 与旧设置页。
+   */
   tmdbTtlHours: z.number().int().min(1).max(720),
   /** TMDB 缓存每类条数上限,超出删最旧(对照 MP CONF.tmdb,缺省 256;大内存模式 1024) */
   tmdbMaxSize: z.number().int().min(16).max(100_000),
-  /** 空结果 / 未识别的短缓存秒数(对照 MP EMPTY_RESULT_CACHE_TTL,缺省 1800) */
+  /** @deprecated CACHE-2 起由 storage.cacheTtl.tmdbMissDays 取代,服务端不再读取 */
   emptyResultTtlSec: z.number().int().min(0).max(86_400),
   /** 图片代理落盘缓存(对照 MP GLOBAL_IMAGE_CACHE,缺省关闭;关闭时仍代理,只是不落盘) */
   globalImageCache: z.boolean(),
@@ -410,7 +413,7 @@ export const DEFAULT_ENRICH_DOMAINS: string[] = [
 
 export const IdentitySettings = z.object({
   eagerTmdbLookup: z.boolean(),
-  /** 待识别池里 unmatched 条目多少天没有新证据就归档(仍可按状态筛出、可手动指定) */
+  /** @deprecated CACHE-2 起由 storage.retentionDays.identityPoolArchive 取代,服务端不再读取 */
   poolArchiveDays: z.number().int().min(1).max(3650),
   /**
    * META-1:订阅别名 / 新作品收录规则命中、TMDB 却查不到时自动尝试一次元数据补全(只出建议,不建作品)。
@@ -432,6 +435,98 @@ export const IdentitySettings = z.object({
 });
 export type IdentitySettings = z.infer<typeof IdentitySettings>;
 
+// ── 存储预算与保留(CACHE-2,docs/runbook/storage.md)──
+
+const Gb = z.number().min(0.01).max(10_000);
+const Days = z.number().int().min(1).max(3650);
+
+export const StorageBudgets = z
+  .object({
+    /** PG 数据目录预算(GB):超过 pgDataWarnGb 告警,超过本值 critical */
+    pgDataGb: Gb,
+    pgDataWarnGb: Gb,
+    /** 图片代理缓存容量(GB):超出按最久未访问删除(LRU) */
+    imagesGb: Gb,
+    /** DATA_DIR/backups 占用预算(GB) */
+    backupsGb: Gb,
+    /** Agent 会话 + 视觉证据(DATA_DIR/agent-sessions、tmp/evidence)预算(GB) */
+    sessionsEvidenceGb: Gb,
+  })
+  .refine((v) => v.pgDataWarnGb <= v.pgDataGb, { message: "PG 告警线不得高于预算" });
+export type StorageBudgets = z.infer<typeof StorageBudgets>;
+
+/** 各类流水数据保留期(到期由 storage.retention.* 定时任务分批删除) */
+export const StorageRetentionDays = z.object({
+  /** observation(Feed 观察) */
+  observation: Days,
+  /** sse_event(SSE 补读) */
+  sseEvent: Days,
+  /** process_heartbeat_sample(小时) */
+  heartbeatHours: z
+    .number()
+    .int()
+    .min(1)
+    .max(24 * 90),
+  /** 已结束的业务任务 task 与引擎 run */
+  taskRun: Days,
+  /** 已结束 Agent 会话的 agent_run_event / agent_run_message */
+  agentEvent: Days,
+  /** audit_event(能力调用审计除外) */
+  audit: Days,
+  /** 能力调用统计:audit_event(target_type=capability)与已结束的 capability_invocation */
+  capabilityStats: Days,
+  /** 待识别池 unmatched 条目无新证据多少天后归档 */
+  identityPoolArchive: Days,
+});
+export type StorageRetentionDays = z.infer<typeof StorageRetentionDays>;
+
+/** 缓存有效期(天):只改 TTL 的取值来源,缓存语义仍对照 MP(docs/porting/moviepilot-tmdb-cache.md) */
+export const StorageCacheTtl = z.object({
+  /** TMDB 搜索 / find 响应与识别结果 */
+  tmdbSearchDays: Days,
+  /** TMDB 详情(/movie/{id}、/tv/{id}、季);追踪中的作品命中时续期 */
+  tmdbDetailDays: Days,
+  /** TMDB 空结果与未识别负缓存(MP EMPTY_RESULT_CACHE_TTL) */
+  tmdbMissDays: Days,
+  /** 站点详情页扩展内容(kv_cache site.detail) */
+  siteDetailDays: Days,
+  /** 网页搜索结果 */
+  webSearchDays: Days,
+});
+export type StorageCacheTtl = z.infer<typeof StorageCacheTtl>;
+
+export const StorageSettings = z.object({
+  budgets: StorageBudgets,
+  retentionDays: StorageRetentionDays,
+  cacheTtl: StorageCacheTtl,
+});
+export type StorageSettings = z.infer<typeof StorageSettings>;
+
+export const DEFAULT_STORAGE_SETTINGS: StorageSettings = {
+  budgets: { pgDataGb: 25, pgDataWarnGb: 20, imagesGb: 20, backupsGb: 20, sessionsEvidenceGb: 10 },
+  retentionDays: {
+    observation: 90,
+    sseEvent: 7,
+    heartbeatHours: 24,
+    taskRun: 60,
+    agentEvent: 90,
+    audit: 180,
+    capabilityStats: 90,
+    identityPoolArchive: 30,
+  },
+  cacheTtl: { tmdbSearchDays: 7, tmdbDetailDays: 30, tmdbMissDays: 1, siteDetailDays: 7, webSearchDays: 1 },
+};
+
+/** 存储设置与缺省逐层合并(旧库里缺子字段时补齐) */
+export function withStorageDefaults(v: unknown): StorageSettings {
+  const o = (v && typeof v === "object" ? v : {}) as Partial<Record<keyof StorageSettings, object>>;
+  return {
+    budgets: { ...DEFAULT_STORAGE_SETTINGS.budgets, ...(o.budgets ?? {}) },
+    retentionDays: { ...DEFAULT_STORAGE_SETTINGS.retentionDays, ...(o.retentionDays ?? {}) },
+    cacheTtl: { ...DEFAULT_STORAGE_SETTINGS.cacheTtl, ...(o.cacheTtl ?? {}) },
+  } as StorageSettings;
+}
+
 export const GlobalSettings = z.object({
   automation: AutomationSettings,
   cache: CacheSettings,
@@ -445,6 +540,7 @@ export const GlobalSettings = z.object({
   naming: NamingSettings,
   identity: IdentitySettings,
   search: SearchSettings,
+  storage: StorageSettings,
 });
 export type GlobalSettings = z.infer<typeof GlobalSettings>;
 
@@ -526,6 +622,7 @@ export const DEFAULT_SETTINGS: GlobalSettings = {
     enrichDomains: DEFAULT_ENRICH_DOMAINS,
   },
   search: { defaultSiteMode: "default", siteIds: [] },
+  storage: DEFAULT_STORAGE_SETTINGS,
 };
 
 /** PATCH /settings:按分组部分更新;服务端与现值合并后用 GlobalSettings 整体再校验 */
@@ -576,6 +673,13 @@ export const GlobalSettingsUpdate = z.object({
   naming: NamingSettings.partial().optional(),
   identity: IdentitySettings.partial().optional(),
   search: SearchSettings.partial().optional(),
+  storage: z
+    .object({
+      budgets: z.object(StorageBudgets.shape).partial().optional(),
+      retentionDays: StorageRetentionDays.partial().optional(),
+      cacheTtl: StorageCacheTtl.partial().optional(),
+    })
+    .optional(),
 });
 export type GlobalSettingsUpdate = z.infer<typeof GlobalSettingsUpdate>;
 
@@ -602,6 +706,16 @@ export function mergeSettings(current: GlobalSettings, patch: GlobalSettingsUpda
     naming: { ...(current.naming ?? DEFAULT_SETTINGS.naming), ...patch.naming },
     identity: { ...(current.identity ?? DEFAULT_SETTINGS.identity), ...patch.identity },
     search: { ...(current.search ?? DEFAULT_SETTINGS.search), ...patch.search },
+    storage: mergeStorage(current.storage, patch.storage),
+  };
+}
+
+function mergeStorage(current: StorageSettings | undefined, patch: GlobalSettingsUpdate["storage"]): StorageSettings {
+  const base = withStorageDefaults(current);
+  return {
+    budgets: { ...base.budgets, ...patch?.budgets },
+    retentionDays: { ...base.retentionDays, ...patch?.retentionDays },
+    cacheTtl: { ...base.cacheTtl, ...patch?.cacheTtl },
   };
 }
 
@@ -638,6 +752,10 @@ export const DEPRECATED_SETTINGS_FIELDS = [
   "pi.model",
   "pi.thinkingLevel",
   "pi.apiKeySecretRef",
+  // CACHE-2:由 storage.cacheTtl / storage.retentionDays 取代
+  "cache.tmdbTtlHours",
+  "cache.emptyResultTtlSec",
+  "identity.poolArchiveDays",
 ] as const;
 
 // ── 设置页分区(docs/design/console-ia.md §3.4) ──
@@ -682,6 +800,7 @@ export const SETTINGS_SECTIONS: readonly SettingsSectionDef[] = [
       { id: "cache", label: "缓存水位" },
       { id: "budget", label: "每日预算" },
       { id: "retention", label: "保留" },
+      { id: "storage", label: "存储与保留" },
     ],
     fields: [
       "automation.enabled",
@@ -695,6 +814,9 @@ export const SETTINGS_SECTIONS: readonly SettingsSectionDef[] = [
       "budget.maxConcurrentDownloads",
       "retention.seedRetentionDays",
       "retention.logRetentionDays",
+      "storage.budgets",
+      "storage.retentionDays",
+      "storage.cacheTtl",
     ],
     resources: [],
   },
@@ -774,11 +896,8 @@ export const SETTINGS_SECTIONS: readonly SettingsSectionDef[] = [
     fields: [
       "metadata.tmdbApiKeySecretRef",
       "metadata.tmdbBaseUrl",
-      "cache.tmdbTtlHours",
       "cache.tmdbMaxSize",
-      "cache.emptyResultTtlSec",
       "identity.eagerTmdbLookup",
-      "identity.poolArchiveDays",
       "identity.autoEnrich",
       "identity.enrichDailyBudget",
       "identity.enrichDomains",
diff --git a/packages/db/migrations/0050_storage_retention.ts b/packages/db/migrations/0050_storage_retention.ts
new file mode 100644
index 00000000..b78d7cbf
--- /dev/null
+++ b/packages/db/migrations/0050_storage_retention.ts
@@ -0,0 +1,79 @@
+import type { Kysely } from "kysely";
+import { execDdl } from "../src/migration-helpers.ts";
+
+// CACHE-2 存储保留(docs/runbook/storage.md):
+// - 保留清理按时间列分批删除,给还没有时间索引的高流水表补上(已有:task_created_idx、agent_run_event_at_idx、
+//   process_heartbeat_sample_at_idx);
+// - 按表设置 autovacuum:批量删除 / 追加为主的大表降低触发比例,频繁原地更新的小表更激进,避免死元组堆积。
+// 引擎 schema(openworkflow)的表由引擎自己建,这里不动。
+
+const INDEXES: [name: string, ddl: string][] = [
+  ["observation_created_idx", "observation (created_at)"],
+  ["sse_event_at_idx", "sse_event (at)"],
+  ["audit_event_at_idx", "audit_event (at)"],
+  ["capability_invocation_created_idx", "capability_invocation (created_at)"],
+  ["agent_run_message_created_idx", "agent_run_message (created_at)"],
+  ["tasks_fact_created_idx", "tasks_fact (created_at)"],
+  ["tasks_run_meta_created_idx", "tasks_run_meta (created_at)"],
+  ["tasks_op_ledger_started_idx", "tasks_op_ledger (started_at) where status = 'succeeded'"],
+];
+
+/** 追加 + 批量删除为主的大表 */
+const APPEND_TABLES = [
+  "observation",
+  "sse_event",
+  "audit_event",
+  "agent_run_event",
+  "process_heartbeat_sample",
+  "capability_invocation",
+  "task",
+  "tasks_fact",
+  "tasks_run_meta",
+];
+const APPEND_OPTS = {
+  autovacuum_vacuum_scale_factor: "0.05",
+  autovacuum_analyze_scale_factor: "0.02",
+  autovacuum_vacuum_insert_scale_factor: "0.1",
+};
+
+/** 频繁原地更新的小表(心跳 15 秒一次、令牌桶、调度状态、缓存命中刷新 accessed_at) */
+const HOT_TABLES = ["process_heartbeat", "rate_limit_bucket", "scheduled_job", "kv_cache", "outbox_event"];
+const HOT_OPTS = {
+  autovacuum_vacuum_scale_factor: "0.02",
+  autovacuum_vacuum_threshold: "100",
+  autovacuum_analyze_scale_factor: "0.05",
+};
+
+const setOpts = (tables: string[], o: Record<string, string>) =>
+  tables
+    .map(
+      (t) =>
+        `alter table ${t} set (${Object.entries(o)
+          .map(([k, v]) => `${k} = ${v}`)
+          .join(", ")});`,
+    )
+    .join("\n");
+const resetOpts = (tables: string[], o: Record<string, string>) =>
+  tables.map((t) => `alter table ${t} reset (${Object.keys(o).join(", ")});`).join("\n");
+
+// biome-ignore lint/suspicious/noExplicitAny: 迁移不依赖应用表类型
+export async function up(db: Kysely<any>): Promise<void> {
+  await execDdl(
+    db,
+    `${INDEXES.map(([n, d]) => `create index if not exists ${n} on ${d};`).join("\n")}
+${setOpts(APPEND_TABLES, APPEND_OPTS)}
+${setOpts(HOT_TABLES, HOT_OPTS)}
+`,
+  );
+}
+
+// biome-ignore lint/suspicious/noExplicitAny: 同上
+export async function down(db: Kysely<any>): Promise<void> {
+  await execDdl(
+    db,
+    `${resetOpts(HOT_TABLES, HOT_OPTS)}
+${resetOpts(APPEND_TABLES, APPEND_OPTS)}
+${INDEXES.map(([n]) => `drop index if exists ${n};`).join("\n")}
+`,
+  );
+}
diff --git a/packages/db/src/cache.ts b/packages/db/src/cache.ts
index fdcff6a6..e36d0a60 100644
--- a/packages/db/src/cache.ts
+++ b/packages/db/src/cache.ts
@@ -58,6 +58,14 @@ export class PgCache {
     return r.rows.length ? (r.rows[0]!.value as T) : null;
   }
 
+  /** 续期:未过期的条目把 expires_at 推到 now + ttl(只延长不缩短);返回是否有行被续期 */
+  async renew(region: string, key: string, ttl: number): Promise<boolean> {
+    if (ttl <= 0) return false;
+    const r = await sql`update kv_cache set expires_at = greatest(expires_at, now() + make_interval(secs => ${ttl}))
+      where region = ${region} and key = ${key} and expires_at > now()`.execute(this.db);
+    return Number(r.numAffectedRows ?? 0) > 0;
+  }
+
   async exists(region: string, key: string): Promise<boolean> {
     const r =
       await sql`select 1 from kv_cache where region = ${region} and key = ${key} and expires_at > now()`.execute(
diff --git a/packages/db/src/index.ts b/packages/db/src/index.ts
index 2d2930ba..031e3928 100644
--- a/packages/db/src/index.ts
+++ b/packages/db/src/index.ts
@@ -1,5 +1,5 @@
 // 统一从本包取 Kysely 与 sql,避免各包各装一份 kysely
-export { type Kysely, type Selectable, sql, type Transaction } from "kysely";
+export { type Kysely, type RawBuilder, type Selectable, sql, type Transaction } from "kysely";
 export {
   type CachedOptions,
   cachedCall,