chore: bump version to 1.0.8

style: cargo fmt across the workspace
Apply rustfmt to the 11 files that had drifted (86 hunks): x-media site modules (bsky/pixiv/twitter) and xmedia-bot (config/main/ photo/send). Formatting only - no semantic changes; full test suite still green.
2026-09-23 23:32:05 +00:00 · 2026-08-07 16:23:40 +08:00 · 2026-08-07 16:12:01 +08:00 · 2026-08-07 16:10:25 +08:00 · 2026-08-07 16:00:12 +08:00 · 2026-08-07 10:25:54 +08:00
24 changed files with 2324 additions and 597 deletions
@@ -30,9 +30,10 @@ The `x-media` library: `site::fetch(url)` dispatches (in order) twitter → bsky
 | `crates/x-media/src/site/<twitter\|pixiv\|bsky>/` | One directory per site: `mod.rs` (re-exports), `interface.rs` (PATTERN, `enabled()`, `fetch_from_url()`, site struct, `From<SiteStruct> for Fetched`), `model.rs` (serde DTOs). Pixiv adds `api.rs` (auth + transport); twitter adds `auth.rs` (logged-in GraphQL `TweetDetail` fallback for NSFW tweets, gated on `TWITTER_AUTH_TOKEN`) |
 | `crates/xmedia-bot/src/main.rs` | Entry point: env/log init, queue worker start, pixiv validation, 300 s edit-expiry sweep, dptree handler tree, webhook vs polling dispatch |
 | `crates/xmedia-bot/src/config.rs` | Manual env parsing into `Config` |
-| `crates/xmedia-bot/src/handlers.rs` | `Command` enum (teloxide `BotCommands`), message/inline/callback handlers, URL extraction, global statics |
+| `crates/xmedia-bot/src/handlers.rs` | `Command` enum (teloxide `BotCommands`), message/inline/callback handlers, URL extraction, global statics; per-URL work spawned with a `Semaphore(8)` cap (teloxide's per-chat workers are sequential — batch-forwards need concurrency) |
 | `crates/xmedia-bot/src/state.rs` | `ChatStore`: parking_lot `Mutex<HashMap>` cache + SQLite write-through (`chat_state` table) |
-| `crates/xmedia-bot/src/queue.rs` | `PersistentTaskQueue`: SQLite-backed single-worker queue (`tasks` table) |
+| `crates/xmedia-bot/src/link_cache.rs` | `LinkCache`: SQLite-backed cache (`link_cache` table) of successfully sent posts — raw caption fields + Telegram `file_id`s; repeat links re-send locally (no fetch/upload), TTL + prune, invalidated on permanent send failure |
+| `crates/xmedia-bot/src/queue.rs` | `PersistentTaskQueue`: SQLite-backed queue (`tasks` table), `QUEUE_WORKERS = 4` concurrent workers (lease via `BEGIN IMMEDIATE` + `locked_until` TTL), retry→dead-letter, `Notify::notify_waiters` wakeup, `busy_timeout` on all connections |
 | `crates/xmedia-bot/src/send.rs` | Media senders, upload fallback, error classification, queue task handlers |

 ## Development Commands
@@ -67,7 +68,8 @@ Docker: `docker build -t tgxmb .` then `docker run --rm -d --name tgxmb --env-fi
 |---|---|
 | `crates/xmedia-bot/src/main.rs` | Startup sequence, webhook vs polling, graceful shutdown (SIGINT via teloxide ctrlc / SIGTERM via `stop_token` for docker, → sweep stop → admin msg → queue stop) |
 | `crates/xmedia-bot/src/handlers.rs` | `CHAT_STORE`/`TASK_QUEUE`/`CONFIG` singletons (open `data/task_queue.db` **relative to CWD**); command dispatch; URL extraction; retry enqueue |
-| `crates/xmedia-bot/src/send.rs` | Constants `MAX_MEDIA_GROUP = 9`, `MAX_UPLOAD_BYTES = 10 MiB`; fallback chain; `classify_request_error` |
+| `crates/xmedia-bot/src/send.rs` | Constants `MAX_MEDIA_GROUP = 9`; fallback chain; `classify_request_error`; download-and-reupload fallback triggered only by Telegram API errors (`is_media_fetch_failure` / `is_size_error`) |
+| `crates/xmedia-bot/src/photo.rs` | Pure-Rust photo processing (no ffmpeg): `png` (image-png) decode/encode + `zune-jpeg` decode + `fast_image_resize` Lanczos3 downscale + `jpeg-encoder`. Photos over Telegram's limits (width + height > 10000 px → `PHOTO_INVALID_DIMENSIONS`; bytes > 10 MiB) are decoded, downscaled keeping the format, PNG bit depth > 24 (RGBA 32-bit / 16-bit per channel) reduced to 24-bit RGB with alpha flattened white (≤24-bit untouched, never upconverted), and transcoded to JPEG only if still over the cap; memory budget guarded, otherwise the item's smaller fallback URL |
 | `crates/x-media/src/site/mod.rs` | Dispatcher, `Fetched`/`FetchError`, shared `CLIENT`, `download_media` (adds `Referer: https://www.pixiv.net/` for `pximg.net` hotlink protection) |
 | `crates/x-media/src/site/pixiv/api.rs` | OAuth token exchange (hardcoded app client id/secret), access-token cache, ugoira zip→MP4 via ffmpeg in `spawn_blocking` |
 | `Dockerfile` | Multi-stage: cached dep layer via stub sources + `touch *.rs` mtime hack, static ffmpeg from ffmpeg.martin-riedl.de (`FFMPEG_URL` arg, `unzip -t` integrity check), `debian:bookworm-slim` runtime, entrypoint |
@@ -81,7 +83,7 @@ Docker: `docker build -t tgxmb .` then `docker run --rm -d --name tgxmb --env-fi
 - **Rust, stable, edition 2024**, workspace resolver 3. No `rust-version`/MSRV pin, no `rust-toolchain.toml` — recent stable is assumed. No nightly features.
 - Package manager: **Cargo** (workspace with path dep `x-media` ← `xmedia-bot`). No `[workspace.package]`/shared deps — each crate lists deps independently.
 - **Two reqwest versions coexist in the lock** (0.12.28 via teloxide, 0.13.3 in x-media) — don't unify casually.
- Config is **environment-variable driven** (dotenv loads `.env`, gitignored; no `.env.example` exists). Key vars: `TELOXIDE_TOKEN` (required), `PIXIV_REFRESH_TOKEN`, `TWITTER_AUTH_TOKEN` (optional; x.com `auth_token` cookie — enables the logged-in GraphQL fallback that fetches NSFW tweets syndication withholds), `BOT_ADMIN` (comma-separated ids), `EDIT_MESSAGE_TTL_SECONDS` (default 86400), `WEBHOOK`/`WEBHOOK_URL`/`WEBHOOK_LISTEN`/`WEBHOOK_PORT`/`WEBHOOK_CERT`/`WEBHOOK_SECRET_TOKEN` (webhook mode requires URL/listen/port, `.expect`ed; `WEBHOOK_CERT` is Telegram-facing self-signed validation only — TLS must be terminated by a reverse proxy), `RUST_LOG`, `TELOXIDE_PROXY`, `LOCAL_USER_ID` (entrypoint only).
+- Config is **environment-variable driven** (dotenv loads `.env`, gitignored; no `.env.example` exists). Key vars: `TELOXIDE_TOKEN` (required), `PIXIV_REFRESH_TOKEN`, `TWITTER_AUTH_TOKEN` (optional; x.com `auth_token` cookie — enables the logged-in GraphQL fallback that fetches NSFW tweets syndication withholds), `BOT_ADMIN` (comma-separated ids), `EDIT_MESSAGE_TTL_SECONDS` (default 86400), `LINK_CACHE_TTL_SECONDS` (default 604800), `WEBHOOK`/`WEBHOOK_URL`/`WEBHOOK_LISTEN`/`WEBHOOK_PORT`/`WEBHOOK_CERT`/`WEBHOOK_SECRET_TOKEN` (webhook mode requires URL/listen/port, `.expect`ed; `WEBHOOK_CERT` is Telegram-facing self-signed validation only — TLS must be terminated by a reverse proxy), `RUST_LOG`, `TELOXIDE_PROXY`, `LOCAL_USER_ID` (entrypoint only).
 - SQLite via `rusqlite` with `bundled` feature (no system libsqlite needed). DB file `data/task_queue.db` is CWD-relative — run from the workspace root, or `/app` in Docker. Mount `./data` and `./cert` volumes.
 - `.gitattributes` enforces LF for `*.sh` (CRLF breaks shebangs in containers). `.gitignore`: `.env`, `data/`, `cert/`, `docker-compose.yml`, `/target`, `.idea/`.
 - Docs are in Chinese; user-facing bot strings too. Keep that convention when editing captions/templates/docs.
@@ -505,6 +505,15 @@ dependencies = [
 "syn",
 ]

+[[package]]
+name = "document-features"
+version = "0.2.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d4b8a88685455ed29a21542a33abd9cb6510b6b129abadabdcef0f4c55bc8f61"
+dependencies = [
+ "litrs",
+]
+
 [[package]]
 name = "dotenv"
 version = "0.15.0"
@@ -599,12 +608,33 @@ version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7360491ce676a36bf9bb3c56c1aa791658183a54d2744120f27285738d90465a"

+[[package]]
+name = "fast_image_resize"
+version = "6.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e9c50201dc184ba6553da1695aac20a042efffbe2d84542cee31917c86c3ab1e"
+dependencies = [
+ "cfg-if",
+ "document-features",
+ "num-traits",
+ "thiserror",
+]
+
 [[package]]
 name = "fastrand"
 version = "2.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9f1f227452a390804cdb637b74a86990f2a7d7ba4b7d5693aac9b4dd6defd8d6"

+[[package]]
+name = "fdeflate"
+version = "0.3.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e6853b52649d4ac5c0bd02320cddc5ba956bdb407c4b75a2c6b75bf51500f8c"
+dependencies = [
+ "simd-adler32",
+]
+
 [[package]]
 name = "find-msvc-tools"
 version = "0.1.9"
@@ -1305,6 +1335,12 @@ dependencies = [
 "libc",
 ]

+[[package]]
+name = "jpeg-encoder"
+version = "0.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a0370574b86f7eca156b9f298392b5e69a23f8c86f3f865add60bbc2e79467a6"
+
 [[package]]
 name = "js-sys"
 version = "0.3.98"
@@ -1352,6 +1388,12 @@ version = "0.8.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "92daf443525c4cce67b150400bc2316076100ce0b3686209eb8cf3c31612e6f0"

+[[package]]
+name = "litrs"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "11d3d7f243d5c5a8b9bb5d6dd2b1602c0cb0b9db1621bafc7ed66e35ff9fe092"
+
 [[package]]
 name = "lock_api"
 version = "0.4.14"
@@ -1604,6 +1646,19 @@ version = "0.3.33"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "19f132c84eca552bf34cab8ec81f1c1dcc229b811638f9d283dceabe58c5569e"

+[[package]]
+name = "png"
+version = "0.18.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "60769b8b31b2a9f263dae2776c37b1b28ae246943cf719eb6946a1db05128a61"
+dependencies = [
+ "bitflags",
+ "crc32fast",
+ "fdeflate",
+ "flate2",
+ "miniz_oxide",
+]
+
 [[package]]
 name = "potential_utf"
 version = "0.1.5"
@@ -3296,7 +3351,7 @@ checksum = "1ffae5123b2d3fc086436f8834ae3ab053a283cfac8fe0a0b8eaae044768a4c4"

 [[package]]
 name = "x-media"
-version = "1.0.5"
+version = "1.0.8"
 dependencies = [
 "bytes",
 "dotenv",
@@ -3315,12 +3370,15 @@ dependencies = [

 [[package]]
 name = "xmedia-bot"
-version = "1.0.5"
+version = "1.0.8"
 dependencies = [
 "dotenv",
+ "fast_image_resize",
 "html-escape",
+ "jpeg-encoder",
 "log",
 "parking_lot",
+ "png",
 "pretty_env_logger",
 "rand 0.8.6",
 "regex",
@@ -3332,6 +3390,7 @@ dependencies = [
 "tokio",
 "url",
 "x-media",
+ "zune-jpeg",
 ]

 [[package]]
@@ -3535,3 +3594,18 @@ dependencies = [
 "cc",
 "pkg-config",
 ]
+
+[[package]]
+name = "zune-core"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cb8a0807f7c01457d0379ba880ba6322660448ddebc890ce29bb64da71fb40f9"
+
+[[package]]
+name = "zune-jpeg"
+version = "0.5.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "27bc9d5b815bc103f142aa054f561d9187d191692ec7c2d1e2b4737f8dbd7296"
+dependencies = [
+ "zune-core",
+]
@@ -10,6 +10,7 @@ Telegram 机器人，将 X / Twitter、Pixiv、Bluesky 的帖子链接转换为
 - 可绑定转发频道自动转发；支持转发前编辑 caption 与自定义模板
 - 发送失败自动重试并持久化，重试耗尽后通知用户
 - Pixiv ugoira 动图自动转码为 MP4
+- 链接结果本地缓存：成功发送后缓存 Telegram file id 与 caption 等，再次收到相同链接直接本地重发，不再请求源站、不保存媒体文件（`LINK_CACHE_TTL_SECONDS` 控制过期，默认 7 天）

 ## 快速开始

@@ -28,7 +29,7 @@ docker build -t tgxmb .
 docker run --rm -d --name tgxmb --env-file .env -v ./data:/app/data tgxmb
 ```

-环境变量：`TELOXIDE_TOKEN`（必填）、`PIXIV_REFRESH_TOKEN`、`BOT_ADMIN`、`EDIT_MESSAGE_TTL_SECONDS`、`RUST_LOG`、`WEBHOOK*`、`TWITTER_AUTH_TOKEN`（可选）。
+环境变量：`TELOXIDE_TOKEN`（必填）、`PIXIV_REFRESH_TOKEN`、`BOT_ADMIN`、`EDIT_MESSAGE_TTL_SECONDS`、`LINK_CACHE_TTL_SECONDS`、`RUST_LOG`、`WEBHOOK*`、`TWITTER_AUTH_TOKEN`（可选）。

 NSFW 推文：公开的 syndication 接口不返回敏感内容。设置 `TWITTER_AUTH_TOKEN`（登录 x.com 后浏览器 Cookie 里的 `auth_token` 值）后，bot 会仅在遇到 NSFW 推文时以登录态获取媒体；未设置则提示无媒体。

@@ -38,16 +39,37 @@ NSFW 推文：公开的 syndication 接口不返回敏感内容。设置 `TWITTE

 **有域名**
 1. DNS A 记录指向服务器
-2. compose 里设 `VIRTUAL_HOST`、`LETSENCRYPT_HOST` 为域名，`WEBHOOK_URL` 设为 `https://域名/`
-3. 证书自动签发与续期，无需手动处理
+2. compose 里设 `VIRTUAL_HOST`、`WEBHOOK_URL` 为域名，并取消注释 `ACME_HOST`（设为域名）
+3. acme-companion 自动签发与续期证书，无需手动处理

 **只有 IP**
-1. 生成自签证书（PEM 格式，见第 3 步）：
-   `openssl req -x509 -newkey rsa:2048 -nodes -days 365 -keyout nginx-certs/default.key -out nginx-certs/default.crt`
-2. compose 里 nginx-proxy 设 `DEFAULT_HOST`，bot 设 `WEBHOOK_CERT: './cert/cert.pem'`（须与代理所服务的为同一张证书）
-3. 证书必须是 PEM 编码（ASCII BASE64，以 `-----BEGIN CERTIFICATE-----` 开头）—— Telegram 只接受该格式；若现有证书是 DER 二进制，转换：
-   `openssl x509 -in cert.der -inform DER -out cert.pem -outform PEM`
-   （私钥同理：`openssl rsa -in key.der -inform DER -out key.pem -outform PEM`）
+Let's Encrypt 支持为公网 IP 签发证书（2026 年起可用，有效期约 7 天，须 `shortlived` profile）。用 [acme.sh](https://github.com/acmesh-official/acme.sh) 自动签发与续期，无需手动证书：
+
+1. compose 里增加 acme-ip 服务（签发 + 每日检查自动续期）：
+   ```yaml
+   acme-ip:
+     image: neilpang/acme.sh
+     container_name: acme-ip
+     command: daemon
+     restart: always
+     volumes:
+       - certs:/acme.sh
+       - html:/usr/share/nginx/html
+       - /var/run/docker.sock:/var/run/docker.sock:ro
+     networks: [proxy]
+   ```
+2. 首次签发（把 `<SERVER_IP>` 换成服务器公网 IP，IPv6 同样支持，多个 `-d` 可并列）：
+   ```bash
+   docker compose exec acme-ip acme.sh --issue --server letsencrypt \
+     -d <SERVER_IP> --cert-profile shortlived --days 3 \
+     --webroot /usr/share/nginx/html \
+     --install-cert --cert-file /acme.sh/<SERVER_IP>.crt \
+     --key-file /acme.sh/<SERVER_IP>.key \
+     --reloadcmd "curl --unix-socket /var/run/docker.sock -X POST http://localhost/containers/nginx-proxy/kill?signal=HUP"
+   ```
+3. compose 里设 `VIRTUAL_HOST: '<SERVER_IP>'`、`WEBHOOK_URL: 'https://<SERVER_IP>/'`，无需 `WEBHOOK_CERT`。续期由 acme.sh daemon 自动完成（`--days 3` = 每 3 天续一次，证书 7 天有效有缓冲），续期成功后自动 HUP 通知 nginx-proxy 加载新证书。
+
+   限制：证书约 7 天有效；验证仅支持 http-01/tls-alpn-01（80 端口必须公网可达）；不支持 DNS-01、私有 IP 与 IP 段；同一 IP 集合每 168 小时限签发 5 张。建议先用 `--server letsencrypt_test` 试签，成功后再切正式服务器。

 Telegram 只接受 443/80/88/8443 端口。

@@ -60,17 +82,17 @@ Telegram 只接受 443/80/88/8443 端口。
 | `PIXIV_REFRESH_TOKEN` | Pixiv 刷新令牌；未设置则禁用 Pixiv |
 | `BOT_ADMIN` | 管理员聊天 ID，逗号分隔；接收启动/停止通知 |
 | `EDIT_MESSAGE_TTL_SECONDS` | 转发前编辑记录过期秒数，默认 86400 |
+| `LINK_CACHE_TTL_SECONDS` | 链接结果缓存过期秒数，默认 604800（7 天） |
 | `RUST_LOG` | 日志级别 |
 | `LOCAL_USER_ID` | 容器内运行用户 UID，默认 9001 |
 | `VIRTUAL_HOST` | 对外域名或 IP，nginx-proxy 按此路由 |
 | `VIRTUAL_PORT` | bot 容器内监听端口，nginx-proxy 的转发目标 |
-| `LETSENCRYPT_HOST` | 设为域名时由 acme-companion 自动签发/续期证书 |
+| `ACME_HOST` | 域名部署：设为域名时由 acme-companion 自动签发/续期证书 |
 | `DEFAULT_HOST` | nginx-proxy 将未知 Host 的请求路由到该 vhost（IP 访问时需要） |
 | `DEFAULT_EMAIL` | acme-companion 证书通知邮箱 |
 | `WEBHOOK` | `true` 启用 webhook 模式（默认轮询） |
 | `WEBHOOK_LISTEN` / `WEBHOOK_PORT` | bot 容器内监听地址/端口 |
-| `WEBHOOK_URL` | 对外公网 HTTPS 地址（`https://域名/`） |
-| `WEBHOOK_CERT` | 自签证书路径（仅 IP 路径需要，须为 PEM 且与代理所服务的一致） |
+| `WEBHOOK_URL` | 对外公网 HTTPS 地址（`https://域名/` 或 `https://IP/`） |
 | `WEBHOOK_SECRET_TOKEN` | 更新校验令牌（`X-Telegram-Bot-Api-Secret-Token`） |

 </details>
@@ -79,17 +101,19 @@ Telegram 只接受 443/80/88/8443 端口。

 | 命令 | 说明 |
 |---|---|
-| `/set_forward_channel <频道>` | 设置转发频道 |
+| `/start` | 欢迎语 |
+| `/help` | 查看全部命令及用法（即本文档的命令表） |
+| `/set_forward_channel <频道>` | 设置转发频道，参数为 `@频道名` 或频道 ID；设置后发送的媒体消息会自动转发到该频道 |
 | `/remove_forward_channel` | 取消转发频道 |
-| `/edit_before_forward` | 开关转发前编辑 |
-| `/set_template <名称>` | 将回复的消息（含 `[]`）保存为模板 |
-| `/set_format <站点> <格式>` | 自定义 caption 格式（占位符 `{url}` `{title}` `{tags}` 等） |
-| `/bot_dict` | 查看聊天状态 |
+| `/edit_before_forward` | 开关「转发前编辑」：开启后，转发成功后 bot 会发一条提示消息，回复它可修改第一条转发消息的 caption（或点击模板按钮套用模板） |
+| `/set_template <名称>` | 回复一条含 `[]` 的消息，将其保存为命名模板；转发时 `[]` 会被替换为原帖链接（配合「转发前编辑」使用） |
+| `/set_format <站点> <格式>` | 自定义某站点的 caption 格式。站点：`twitter` / `bsky` / `pixiv`。占位符：`{url}` `{author}` `{author_url}` `{title}` `{tags}` |
+| `/bot_dict` | 查看当前聊天状态（调试用） |

 链接处理仅限私聊；命令在任意聊天可用。

 ## 备注

- 数据持久化于 `data/task_queue.db`，容器部署需挂载该目录
+- 数据持久化于 `data/task_queue.db`，compose 部署使用 bind mount `./data`（保持目录形式便于备份）
 - 运行环境需安装 ffmpeg（Docker 镜像已内置）
 - 测试：`cargo test --workspace`
@@ -1,6 +1,6 @@
 [package]
 name = "x-media"
-version = "1.0.5"
+version = "1.0.8"
 edition = "2024"

 [dependencies]
@@ -5,9 +5,8 @@ use html_escape::encode_text;
 use regex::Regex;
 use std::sync::LazyLock;

-pub static PATTERN: LazyLock<Regex> = LazyLock::new(|| {
-    Regex::new(r"bsky\.app/profile/([\w.\-:]+)/post/([\w.\-~]+)").unwrap()
-});
+pub static PATTERN: LazyLock<Regex> =
+    LazyLock::new(|| Regex::new(r"bsky\.app/profile/([\w.\-:]+)/post/([\w.\-~]+)").unwrap());

 pub fn enabled() -> bool {
    true
@@ -15,8 +14,14 @@ pub fn enabled() -> bool {

 pub async fn fetch_from_url(url: &str) -> Result<Fetched, FetchError> {
    let caps = PATTERN.captures(url).ok_or(FetchError::NotFound)?;
-    let handle = caps.get(1).map(|m| m.as_str()).ok_or(FetchError::NotFound)?;
-    let rkey = caps.get(2).map(|m| m.as_str()).ok_or(FetchError::NotFound)?;
+    let handle = caps
+        .get(1)
+        .map(|m| m.as_str())
+        .ok_or(FetchError::NotFound)?;
+    let rkey = caps
+        .get(2)
+        .map(|m| m.as_str())
+        .ok_or(FetchError::NotFound)?;
    Ok(fetch(handle, rkey).await?.into())
 }

@@ -197,7 +202,10 @@ mod tests {
        }));
        let post = Post::from_json(&raw.to_string(), "3xxxx".into()).unwrap();
        let fetched: Fetched = post.into();
-        assert_eq!(fetched.source_url, "https://bsky.app/profile/user.bsky.social/post/3xxxx");
+        assert_eq!(
+            fetched.source_url,
+            "https://bsky.app/profile/user.bsky.social/post/3xxxx"
+        );
        assert_eq!(fetched.title, "hello <world>");
        assert_eq!(fetched.media.len(), 1);
        assert!(!fetched.sensitive);
@@ -246,11 +254,10 @@ mod tests {

    #[tokio::test]
    async fn live_fetch_with_photos() {
-        let fetched = fetch_from_url(
-            "https://bsky.app/profile/asagi0398.bsky.social/post/3mqkhrq5w6k2m",
-        )
-        .await
-        .unwrap();
+        let fetched =
+            fetch_from_url("https://bsky.app/profile/asagi0398.bsky.social/post/3mqkhrq5w6k2m")
+                .await
+                .unwrap();
        assert_eq!(
            fetched.source_url,
            "https://bsky.app/profile/asagi0398.bsky.social/post/3mqkhrq5w6k2m"
@@ -260,9 +267,10 @@ mod tests {

    #[tokio::test]
    async fn live_fetch_smoke() {
-        let fetched = fetch_from_url("https://bsky.app/profile/fu-futa.bsky.social/post/3laoveufjv224")
-            .await
-            .unwrap();
+        let fetched =
+            fetch_from_url("https://bsky.app/profile/fu-futa.bsky.social/post/3laoveufjv224")
+                .await
+                .unwrap();
        assert_eq!(
            fetched.source_url,
            "https://bsky.app/profile/fu-futa.bsky.social/post/3laoveufjv224"
@@ -68,18 +68,73 @@ impl Fetched {
    /// caption.
    pub fn caption_with(&self, format: &str) -> String {
        match (&self.render_data, format.is_empty()) {
-            (Some(data), false) => {
-                let escaped = html_escape::encode_text(format).into_owned();
-                escaped
-                    .replace("{url}", &data.url)
-                    .replace("{author}", &data.author)
-                    .replace("{author_url}", &data.author_url)
-                    .replace("{title}", &data.title)
-                    .replace("{tags}", &data.tags)
-            }
+            (Some(data), false) => caption_from_fields(
+                format,
+                "",
+                &data.url,
+                &data.author,
+                &data.author_url,
+                &data.title,
+                &data.tags,
+            ),
            _ => self.caption.clone(),
        }
    }
+
+    /// The pre-escaped placeholder values (author, author_url, title, tags)
+    /// a caller needs to rebuild a caption later, e.g. for a cached post
+    /// where the [`Fetched`] is no longer available.
+    pub fn render_fields(&self) -> Option<(&str, &str, &str, &str)> {
+        self.render_data.as_ref().map(|d| {
+            (
+                d.author.as_str(),
+                d.author_url.as_str(),
+                d.title.as_str(),
+                d.tags.as_str(),
+            )
+        })
+    }
+}
+
+/// Renders a user-supplied caption format from raw (already-escaped) field
+/// values with the same escaping/substitution rules as
+/// [`Fetched::caption_with`]. An empty format returns `built_in` unchanged.
+pub fn caption_from_fields(
+    format: &str,
+    built_in: &str,
+    url: &str,
+    author: &str,
+    author_url: &str,
+    title: &str,
+    tags: &str,
+) -> String {
+    if format.is_empty() {
+        return built_in.to_string();
+    }
+    let escaped = html_escape::encode_text(format).into_owned();
+    escaped
+        .replace("{url}", url)
+        .replace("{author}", author)
+        .replace("{author_url}", author_url)
+        .replace("{title}", title)
+        .replace("{tags}", tags)
+}
+
+/// Stable per-post cache key derived from any supported URL, so variant
+/// domains (x.com / twitter.com / fxtwitter.com, mobile, `/photo/N`
+/// suffixes) map to the same post. Returns `"twitter:<id>"`,
+/// `"pixiv:<id>"` or `"bsky:<handle>/<rkey>"`.
+pub fn cache_key(url: &str) -> Option<String> {
+    if let Some(caps) = twitter::PATTERN.captures(url) {
+        return Some(format!("twitter:{}", &caps[1]));
+    }
+    if let Some(caps) = pixiv::PATTERN.captures(url) {
+        return Some(format!("pixiv:{}", &caps[1]));
+    }
+    if let Some(caps) = bsky::PATTERN.captures(url) {
+        return Some(format!("bsky:{}/{}", &caps[1], &caps[2]));
+    }
+    None
 }

 #[derive(Debug)]
@@ -124,7 +179,6 @@ impl From<reqwest::Error> for FetchError {
    }
 }

-
 impl From<serde_json::Error> for FetchError {
    fn from(e: serde_json::Error) -> Self {
        FetchError::Json(e)
@@ -226,6 +280,55 @@ pub async fn download_media(url: &str) -> Result<bytes::Bytes, FetchError> {
 mod tests {
    use super::*;

+    #[test]
+    fn cache_key_normalizes_domain_variants() {
+        assert_eq!(
+            cache_key("https://x.com/user/status/1234567890/photo/1"),
+            Some("twitter:1234567890".into())
+        );
+        assert_eq!(
+            cache_key("https://mobile.twitter.com/user/status/1234567890"),
+            Some("twitter:1234567890".into())
+        );
+        assert_eq!(
+            cache_key("https://fxtwitter.com/user/status/1234567890"),
+            Some("twitter:1234567890".into())
+        );
+        assert_eq!(
+            cache_key("https://www.pixiv.net/artworks/123456"),
+            Some("pixiv:123456".into())
+        );
+        assert_eq!(
+            cache_key("https://bsky.app/profile/handle.example/post/3lorem"),
+            Some("bsky:handle.example/3lorem".into())
+        );
+        assert_eq!(cache_key("https://example.com/not-a-post"), None);
+    }
+
+    #[test]
+    fn caption_from_fields_substitutes_and_escapes() {
+        // The format string is escaped, the field values are substituted
+        // verbatim (callers pass the already-escaped render data).
+        let out = caption_from_fields(
+            "see {author} at {url} — {title}",
+            "",
+            "https://x.com/u/status/1",
+            "A &amp; B",
+            "https://x.com/u",
+            "hello <world>",
+            "",
+        );
+        assert_eq!(
+            out,
+            "see A &amp; B at https://x.com/u/status/1 — hello <world>"
+        );
+        // Empty format keeps the built-in caption untouched.
+        assert_eq!(
+            caption_from_fields("", "built-in", "u", "a", "au", "t", "g"),
+            "built-in"
+        );
+    }
+
    #[tokio::test]
    async fn unsupported_url_returns_none() {
        let result = fetch("https://example.com/some/article").await;
@@ -10,8 +10,8 @@ use crate::site::FetchError;
 use std::env;
 use std::fmt;
 use std::io::{Cursor, Read};
-use std::sync::atomic::{AtomicBool, Ordering};
 use std::sync::LazyLock;
+use std::sync::atomic::{AtomicBool, Ordering};
 use std::time::{Duration, SystemTime};

 const AUTH_TOKEN_URL: &str = "https://oauth.secure.pixiv.net/auth/token";
@@ -127,7 +127,9 @@ impl PixivAPI {
    pub async fn illust_detail(&self, illust_id: u64) -> Result<IllustrationModel, PixivError> {
        let access_token = self.get_access_token().await?;
        let response = crate::site::CLIENT
-            .get(format!("{APP_API_URL}/v1/illust/detail?illust_id={illust_id}"))
+            .get(format!(
+                "{APP_API_URL}/v1/illust/detail?illust_id={illust_id}"
+            ))
            .header("app-os", "ios")
            .header("app-os-version", "14.6")
            .header("User-Agent", APP_USER_AGENT)
@@ -175,7 +177,9 @@ impl PixivAPI {
    pub async fn ugoira_metadata(&self, illust_id: u64) -> Result<UgoiraMetadataModel, PixivError> {
        let access_token = self.get_access_token().await?;
        let response = crate::site::CLIENT
-            .get(format!("{APP_API_URL}/v1/ugoira/metadata?illust_id={illust_id}"))
+            .get(format!(
+                "{APP_API_URL}/v1/ugoira/metadata?illust_id={illust_id}"
+            ))
            .header("app-os", "ios")
            .header("app-os-version", "14.6")
            .header("User-Agent", APP_USER_AGENT)
@@ -218,87 +222,89 @@ impl PixivAPI {
        let Some(zip_url) = zip_url else {
            return Ok(None);
        };
-        let zip_bytes = crate::site::download_media(&zip_url).await.map_err(|e| match e {
-            FetchError::Http(e) => PixivError::Http(e),
-            other => PixivError::Api(format!("frame zip download failed: {other}")),
-        })?;
+        let zip_bytes = crate::site::download_media(&zip_url)
+            .await
+            .map_err(|e| match e {
+                FetchError::Http(e) => PixivError::Http(e),
+                other => PixivError::Api(format!("frame zip download failed: {other}")),
+            })?;
        let frame_delays = metadata.frames.iter().map(|f| f.delay).collect::<Vec<_>>();
-        let result = tokio::task::spawn_blocking(
-            move || -> Result<(String, tempfile::TempDir), String> {
-            let frames_dir = tempfile::tempdir().map_err(|e| e.to_string())?;
-            let out_dir = tempfile::tempdir().map_err(|e| e.to_string())?;
+        let result =
+            tokio::task::spawn_blocking(move || -> Result<(String, tempfile::TempDir), String> {
+                let frames_dir = tempfile::tempdir().map_err(|e| e.to_string())?;
+                let out_dir = tempfile::tempdir().map_err(|e| e.to_string())?;

-            // Extract frames to canonical zero-padded names; pixiv ugoira
-            // frames are uniformly jpg or png per artwork.
-            let mut archive = zip::ZipArchive::new(Cursor::new(zip_bytes))
-                .map_err(|e| format!("unzip: {e}"))?;
-            // pixiv ugoira frames are uniformly jpg or png per artwork; take
-            // the extension from the first entry.
-            let extension = if archive.len() > 0 {
-                let first_name = archive
-                    .by_index(0)
-                    .map_err(|e| e.to_string())?
-                    .name()
-                    .to_string();
-                first_name
-                    .rsplit('.')
-                    .next()
-                    .unwrap_or("jpg")
-                    .to_string()
-            } else {
-                "jpg".to_string()
-            };
-            let mut count = 0usize;
-            for i in 0..archive.len() {
-                let mut entry = archive.by_index(i).map_err(|e| e.to_string())?;
-                let mut bytes = Vec::new();
-                entry.read_to_end(&mut bytes).map_err(|e| e.to_string())?;
-                let path = frames_dir.path().join(format!("img_{count:05}.{extension}"));
-                std::fs::write(&path, bytes).map_err(|e| e.to_string())?;
-                count += 1;
-            }
-            if count == 0 {
-                return Err("empty frame zip".to_string());
-            }
+                // Extract frames to canonical zero-padded names; pixiv ugoira
+                // frames are uniformly jpg or png per artwork.
+                let mut archive = zip::ZipArchive::new(Cursor::new(zip_bytes))
+                    .map_err(|e| format!("unzip: {e}"))?;
+                // pixiv ugoira frames are uniformly jpg or png per artwork; take
+                // the extension from the first entry.
+                let extension = if archive.len() > 0 {
+                    let first_name = archive
+                        .by_index(0)
+                        .map_err(|e| e.to_string())?
+                        .name()
+                        .to_string();
+                    first_name.rsplit('.').next().unwrap_or("jpg").to_string()
+                } else {
+                    "jpg".to_string()
+                };
+                let mut count = 0usize;
+                for i in 0..archive.len() {
+                    let mut entry = archive.by_index(i).map_err(|e| e.to_string())?;
+                    let mut bytes = Vec::new();
+                    entry.read_to_end(&mut bytes).map_err(|e| e.to_string())?;
+                    let path = frames_dir
+                        .path()
+                        .join(format!("img_{count:05}.{extension}"));
+                    std::fs::write(&path, bytes).map_err(|e| e.to_string())?;
+                    count += 1;
+                }
+                if count == 0 {
+                    return Err("empty frame zip".to_string());
+                }

-            // Constant rate from the median frame delay (ms).
-            let mut delays = frame_delays;
-            delays.sort_unstable();
-            let median = delays[delays.len() / 2].max(1);
-            let framerate = 1000.0 / median as f64;
+                // Constant rate from the median frame delay (ms).
+                let mut delays = frame_delays;
+                delays.sort_unstable();
+                let median = delays[delays.len() / 2].max(1);
+                let framerate = 1000.0 / median as f64;

-            let output = out_dir.path().join("ugoira.mp4");
-            let status = std::process::Command::new("ffmpeg")
-                .args([
-                    "-y",
-                    "-framerate",
-                    &framerate.to_string(),
-                    "-i",
-                    &frames_dir.path().join(format!("img_%05d.{extension}")).to_string_lossy(),
-                    // libx264 needs even dimensions; pixiv ugoira frames can
-                    // be odd-sized (e.g. 277x405).
-                    "-vf",
-                    "scale=trunc(iw/2)*2:trunc(ih/2)*2",
-                    "-c:v",
-                    "libx264",
-                    "-pix_fmt",
-                    "yuv420p",
-                    "-movflags",
-                    "+faststart",
-                    &output.to_string_lossy(),
-                ])
-                .stdout(std::process::Stdio::null())
-                .stderr(std::process::Stdio::null())
-                .status()
-                .map_err(|e| format!("ffmpeg spawn failed: {e}"))?;
-            if !status.success() {
-                return Err(format!("ffmpeg exited with {status}"));
-            }
-            Ok((output.to_string_lossy().into_owned(), out_dir))
-        },
-        )
-        .await
-        .expect("ugoira encode worker panicked");
+                let output = out_dir.path().join("ugoira.mp4");
+                let status = std::process::Command::new("ffmpeg")
+                    .args([
+                        "-y",
+                        "-framerate",
+                        &framerate.to_string(),
+                        "-i",
+                        &frames_dir
+                            .path()
+                            .join(format!("img_%05d.{extension}"))
+                            .to_string_lossy(),
+                        // libx264 needs even dimensions; pixiv ugoira frames can
+                        // be odd-sized (e.g. 277x405).
+                        "-vf",
+                        "scale=trunc(iw/2)*2:trunc(ih/2)*2",
+                        "-c:v",
+                        "libx264",
+                        "-pix_fmt",
+                        "yuv420p",
+                        "-movflags",
+                        "+faststart",
+                        &output.to_string_lossy(),
+                    ])
+                    .stdout(std::process::Stdio::null())
+                    .stderr(std::process::Stdio::null())
+                    .status()
+                    .map_err(|e| format!("ffmpeg spawn failed: {e}"))?;
+                if !status.success() {
+                    return Err(format!("ffmpeg exited with {status}"));
+                }
+                Ok((output.to_string_lossy().into_owned(), out_dir))
+            })
+            .await
+            .expect("ugoira encode worker panicked");
        match result {
            Ok(pair) => Ok(Some(pair)),
            Err(message) => {
@@ -332,9 +338,8 @@ fn log_once_ffmpeg_missing() {
 }

 /// pixiv3-rs replacement: `None` when `PIXIV_REFRESH_TOKEN` is unset.
-static PIXIV_CLIENT: LazyLock<Option<PixivAPI>> = LazyLock::new(|| {
-    env::var("PIXIV_REFRESH_TOKEN").ok().map(PixivAPI::new)
-});
+static PIXIV_CLIENT: LazyLock<Option<PixivAPI>> =
+    LazyLock::new(|| env::var("PIXIV_REFRESH_TOKEN").ok().map(PixivAPI::new));

 /// Set at startup when the login validation fails; pixiv stays disabled until
 /// the next process start.
@@ -82,12 +82,15 @@ impl Illustration {
            // keeps media empty when encoding fails or ffmpeg is missing.
        } else if model.page_count > 1 {
            media.extend(model.meta_pages.iter().filter_map(|page| {
-                page.image_urls.original.clone().map(|original| Media::Illustration {
-                    title: None,
-                    url: original,
-                    thumbnail_url: Some(page.image_urls.medium.clone()),
-                    fallback_url: Some(page.image_urls.large.clone()),
-                })
+                page.image_urls
+                    .original
+                    .clone()
+                    .map(|original| Media::Illustration {
+                        title: None,
+                        url: original,
+                        thumbnail_url: Some(page.image_urls.medium.clone()),
+                        fallback_url: Some(page.image_urls.large.clone()),
+                    })
            }));
        } else if let Some(original) = model
            .meta_single_page
@@ -147,8 +150,8 @@ impl From<Illustration> for Fetched {

 #[cfg(test)]
 mod tests {
-    use super::*;
    use super::super::model::IllustrationModel;
+    use super::*;

    fn illust_json(
        type_: &str,
@@ -203,8 +206,14 @@ mod tests {
            ("https://pixiv.net/artworks/123456", "123456"),
            ("https://www.pixiv.net/en/artworks/123456", "123456"),
            ("https://www.pixiv.net/i/123456", "123456"),
-            ("https://www.pixiv.net/member_illust.php?mode=medium&illust_id=123456", "123456"),
-            ("https://www.pixiv.net/en/member_illust.php?illust_id=123456", "123456"),
+            (
+                "https://www.pixiv.net/member_illust.php?mode=medium&illust_id=123456",
+                "123456",
+            ),
+            (
+                "https://www.pixiv.net/en/member_illust.php?illust_id=123456",
+                "123456",
+            ),
        ];
        for (url, id) in cases {
            let caps = PATTERN.captures(url).unwrap_or_else(|| panic!("{url}"));
@@ -225,7 +234,14 @@ mod tests {

    #[test]
    fn ugoira_yields_empty_media() {
-        let v = illust_json("ugoira", 1, Some("https://i.pximg.net/orig.jpg"), None, vec![], 0);
+        let v = illust_json(
+            "ugoira",
+            1,
+            Some("https://i.pximg.net/orig.jpg"),
+            None,
+            vec![],
+            0,
+        );
        let illustration = parse(v);
        let fetched: Fetched = illustration.into();
        assert!(fetched.media.is_empty());
@@ -296,7 +312,12 @@ mod tests {
        let fetched: Fetched = parse(v).into();
        assert_eq!(fetched.media.len(), 1);
        match &fetched.media[0] {
-            Media::Illustration { url, thumbnail_url, fallback_url, .. } => {
+            Media::Illustration {
+                url,
+                thumbnail_url,
+                fallback_url,
+                ..
+            } => {
                assert_eq!(url, "https://i.pximg.net/p2.jpg");
                assert_eq!(thumbnail_url.as_deref(), Some("m2.jpg"));
                assert_eq!(fallback_url.as_deref(), Some("l2.jpg"));
@@ -307,7 +328,14 @@ mod tests {

    #[test]
    fn caption_with_escapes_format_and_substitutes() {
-        let v = illust_json("illust", 1, Some("https://i.pximg.net/o.jpg"), None, vec![], 0);
+        let v = illust_json(
+            "illust",
+            1,
+            Some("https://i.pximg.net/o.jpg"),
+            None,
+            vec![],
+            0,
+        );
        let fetched: Fetched = parse(v).into();
        // Format string is escaped in full, then placeholders substituted.
        let out = fetched.caption_with("{title} by {author} <script> {tags}");
@@ -330,7 +358,14 @@ mod tests {
    #[test]
    fn ai_work_gets_leading_ai_tag() {
        // illust_ai_type == 2 is the only AI marker.
-        let v = illust_json("illust", 1, Some("https://i.pximg.net/o.jpg"), None, vec![], 2);
+        let v = illust_json(
+            "illust",
+            1,
+            Some("https://i.pximg.net/o.jpg"),
+            None,
+            vec![],
+            2,
+        );
        let fetched: Fetched = parse(v).into();
        assert!(
            fetched.caption.contains("#AI #tag1 #tag2"),
@@ -338,14 +373,25 @@ mod tests {
            fetched.caption
        );
        // The {tags} placeholder reflects the tag array too.
-        assert!(fetched.caption_with("{tags}").starts_with("#AI "), "got: {}", fetched.caption_with("{tags}"));
+        assert!(
+            fetched.caption_with("{tags}").starts_with("#AI "),
+            "got: {}",
+            fetched.caption_with("{tags}")
+        );
    }

    #[test]
    fn non_ai_work_has_no_ai_tag() {
        // 1 = explicitly not AI, 0 = undefined: neither gets the #AI tag.
        for ai_type in [0, 1] {
-            let v = illust_json("illust", 1, Some("https://i.pximg.net/o.jpg"), None, vec![], ai_type);
+            let v = illust_json(
+                "illust",
+                1,
+                Some("https://i.pximg.net/o.jpg"),
+                None,
+                vec![],
+                ai_type,
+            );
            let fetched: Fetched = parse(v).into();
            assert!(
                !fetched.caption.contains("#AI"),
@@ -357,7 +403,14 @@ mod tests {

    #[test]
    fn caption_escapes_and_links() {
-        let v = illust_json("illust", 1, Some("https://i.pximg.net/o.jpg"), None, vec![], 0);
+        let v = illust_json(
+            "illust",
+            1,
+            Some("https://i.pximg.net/o.jpg"),
+            None,
+            vec![],
+            0,
+        );
        let fetched: Fetched = parse(v).into();
        assert!(
            fetched
@@ -367,9 +420,6 @@ mod tests {
            fetched.caption
        );
        assert!(fetched.caption.contains("#tag1 #tag2"));
-        assert_eq!(
-            fetched.source_url,
-            "https://www.pixiv.net/artworks/123"
-        );
+        assert_eq!(fetched.source_url, "https://www.pixiv.net/artworks/123");
    }
 }
@@ -3,4 +3,4 @@ mod interface;
 mod model;

 pub use api::{PixivAPI, PixivError, disable, fetch, validate};
-pub use interface::{PATTERN, Illustration, enabled, fetch_from_url};
+pub use interface::{Illustration, PATTERN, enabled, fetch_from_url};
@@ -23,7 +23,7 @@

 use std::sync::LazyLock;

-use serde_json::{json, Value};
+use serde_json::{Value, json};

 use crate::site::FetchError;

@@ -40,8 +40,7 @@ static AUTH_TOKEN: LazyLock<Option<String>> = LazyLock::new(|| {
 });

 /// Public "logged in" client token used by the x.com web app.
-const LOGGED_IN_BEARER: &str =
-    "Bearer AAAAAAAAAAAAAAAAAAAAANRILgAAAAAAnNwIzUejRCOuH5E6I8xnZz4puTs%3D1Zv7ttfk8LF81IUq16cHjhLTvJu4FA33AGWWjCpTnA";
+const LOGGED_IN_BEARER: &str = "Bearer AAAAAAAAAAAAAAAAAAAAANRILgAAAAAAnNwIzUejRCOuH5E6I8xnZz4puTs%3D1Zv7ttfk8LF81IUq16cHjhLTvJu4FA33AGWWjCpTnA";

 /// `TweetDetail` query id (from nazurin; still valid as of 2026-08,
 /// corroborated by the current FxEmbed build — see module caveats).
@@ -103,9 +102,7 @@ pub fn enabled() -> bool {
 /// Fetches a tweet as the logged-in user via the private GraphQL API.
 /// Returns the syndication-shaped [`Tweet`] (media included for NSFW posts).
 pub async fn fetch(id: &str) -> Result<Tweet, FetchError> {
-    let token = AUTH_TOKEN
-        .as_deref()
-        .ok_or(FetchError::Sensitive)?;
+    let token = AUTH_TOKEN.as_deref().ok_or(FetchError::Sensitive)?;
    // 16 random bytes as 32 hex chars: X rejects ct0 values of any other
    // length with 403 code 353 ("matching csrf cookie and header").
    let ct0: String = (0..16)
@@ -136,11 +133,12 @@ pub async fn fetch(id: &str) -> Result<Tweet, FetchError> {
    let text = response.text().await?;
    let json: Value = serde_json::from_str(&text)?;
    let result = parse_tweet_result(&json, id)?;
-    let syndication_shape = to_syndication_shape(&result)
-        .ok_or_else(|| FetchError::Json(serde_json::Error::io(std::io::Error::new(
+    let syndication_shape = to_syndication_shape(&result).ok_or_else(|| {
+        FetchError::Json(serde_json::Error::io(std::io::Error::new(
            std::io::ErrorKind::InvalidData,
            "missing tweet fields in GraphQL response",
-        ))))?;
+        )))
+    })?;
    Tweet::from_syndication_json(&syndication_shape.to_string()).map_err(FetchError::Json)
 }

@@ -228,7 +226,6 @@ fn to_syndication_shape(tweet: &Value) -> Option<Value> {
            "screen_name": user.get("screen_name"),
        },
        "possibly_sensitive": legacy.get("possibly_sensitive"),
-        "display_text_range": legacy.get("display_text_range"),
        "entities": legacy.get("entities"),
        "mediaDetails": legacy.pointer("/extended_entities/media"),
    }))
@@ -251,12 +248,12 @@ mod tests {
            "legacy": {
                "id_str": "2083868672721039569",
                "full_text": "nsfw content https://t.co/abc123",
-                "display_text_range": [0, 12],
                "possibly_sensitive": true,
                "entities": {
-                    "urls": [
-                        { "url": "https://t.co/abc123", "expanded_url": "https://example.com/x" }
-                    ]
+                    // The appended media link lives in extended_entities.media,
+                    // not entities.urls, so it has no expansion mapping and the
+                    // content-based strip removes it.
+                    "urls": []
                },
                "extended_entities": {
                    "media": [
@@ -318,8 +315,11 @@ mod tests {
            }
            other => panic!("expected video, got {other:?}"),
        }
-        assert_eq!(fetched.source_url, "https://x.com/nsfw_author/status/2083868672721039569");
-        // display_text_range cuts the trailing t.co link.
+        assert_eq!(
+            fetched.source_url,
+            "https://x.com/nsfw_author/status/2083868672721039569"
+        );
+        // The appended media short link (no URL-entity mapping) is stripped.
        assert_eq!(fetched.title, "nsfw content");
    }

@@ -331,7 +331,10 @@ mod tests {
        let json = conversation(rt);
        let result = parse_tweet_result(&json, "2083868672721039569").unwrap();
        assert!(result.pointer("/legacy/retweeted_status_result").is_none());
-        assert_eq!(result.pointer("/legacy/id_str").unwrap(), "2083868672721039569");
+        assert_eq!(
+            result.pointer("/legacy/id_str").unwrap(),
+            "2083868672721039569"
+        );
    }

    #[test]
@@ -35,9 +35,7 @@ pub async fn fetch_from_url(url: &str) -> Result<Fetched, FetchError> {
                    }
                }
            } else {
-                log::info!(
-                    "tweet {id} is sensitive; set TWITTER_AUTH_TOKEN to fetch NSFW media"
-                );
+                log::info!("tweet {id} is sensitive; set TWITTER_AUTH_TOKEN to fetch NSFW media");
                Ok(empty_fetched(url))
            }
        }
@@ -90,7 +88,7 @@ pub async fn fetch(id: &str) -> Result<Tweet, FetchError> {
    {
        return Err(FetchError::Sensitive);
    }
-    Ok(Tweet::from_syndication_json(&text).map_err(FetchError::Json)?)
+    Tweet::from_syndication_json(&text).map_err(FetchError::Json)
 }

 /// The syndication token: JS `((id / 1e15) * PI).toString(36)` (the
@@ -158,12 +156,10 @@ impl Tweet {
    pub fn from_syndication_json(raw_json: &str) -> Result<Self, serde_json::Error> {
        let json: model::SyndicationTweet = serde_json::from_str(raw_json)?;
        let id = json.id_str;
-        // Strip the appended media short link first, then expand the remaining
-        // t.co short links (the user's own URLs) to their real destinations.
-        let text = expand_links(
-            &strip_trailing_short_links(&json.text, json.display_text_range),
-            &json.entities.urls,
-        );
+        // Expand the user's t.co short links to their real destinations and
+        // strip the appended media short link, mirroring FxEmbed's linkFixer
+        // (no display_text_range arithmetic — see expand_links).
+        let text = expand_links(&json.text, &json.entities.urls);
        // `name` is the display name, `screen_name` the handle (Python's
        // vxtwitter mapping: author = display name, author_id = handle).
        let author = json.user.name;
@@ -204,51 +200,48 @@ impl Tweet {
    }
 }

-/// The raw syndication `text` ends with the appended media short link
-/// (" https://t.co/wmI8McgXul"). `display_text_range` marks the visible text;
-/// a regex strips any remaining trailing t.co link when the range is absent
-/// or a tweet ends in a URL short link.
-///
-/// X reports these indices in Unicode **code points**, not UTF-16 units
-/// (verified against GraphQL responses containing emoji: cutting an emoji
-/// tweet by UTF-16 units silently drops the character after the emoji).
-fn strip_trailing_short_links(text: &str, display_text_range: Option<[usize; 2]>) -> String {
-    let mut out = match display_text_range {
-        Some([start, end]) if start < end => {
-            text.chars().skip(start).take(end - start).collect()
-        }
-        _ => text.to_string(),
-    };
-    while TRAILING_TCO.is_match(&out) {
-        out = TRAILING_TCO.replace(&out, "").into_owned();
-    }
-    out
-}
-
-/// Trailing Twitter short link, optionally preceded by whitespace.
-static TRAILING_TCO: LazyLock<Regex> = LazyLock::new(|| {
-    Regex::new(r"\s*https?://t\.co/[A-Za-z0-9]+$").unwrap()
-});
-
-/// Replaces every t.co short link that has an entity mapping with its
-/// expanded URL. Short links without a mapping stay untouched.
+/// Mirrors FxEmbed's `linkFixer` (link-fixer.ts): expand every t.co short
+/// link that has an entity mapping to its real destination, drop internal
+/// `x.com/i/web/status/…` plumbing links, then strip any remaining t.co
+/// short link (the appended media link and other unmapped short links).
+/// Pure content matching — no `display_text_range` arithmetic, so the
+/// endpoint's inconsistent index units (UTF-16 vs code points, see the
+/// deleted `strip_trailing_short_links`) never matter.
 fn expand_links(text: &str, urls: &[model::SyndicationEntityUrl]) -> String {
    let mut out = text.to_string();
    for entity in urls {
-        if let Some(expanded) = &entity.expanded_url {
-            out = out.replace(&entity.url, expanded);
-        }
+        let Some(expanded) = &entity.expanded_url else {
+            continue;
+        };
+        let replacement = if WEB_STATUS_URL.is_match(expanded) {
+            ""
+        } else {
+            expanded
+        };
+        out = out.replace(&entity.url, replacement);
    }
-    out
+    TCO_LINK.replace_all(&out, "").into_owned()
 }

+/// Internal x.com page links (reply / quote plumbing) expand to
+/// `x.com/i/web/status/<id>`; FxEmbed drops them — the tweet's own content
+/// already carries the information.
+static WEB_STATUS_URL: LazyLock<Regex> =
+    LazyLock::new(|| Regex::new(r"^https://(?:x\.com|twitter\.com)/i/web/status/\w+").unwrap());
+
+/// A t.co short link, optionally preceded by a space. Any leftover
+/// occurrence (unmapped — e.g. the appended media link) is removed,
+/// mirroring FxEmbed. Real short-link codes are 10 alphanumerics; the
+/// length-agnostic class keeps fixtures and hypothetical odd lengths safe.
+static TCO_LINK: LazyLock<Regex> =
+    LazyLock::new(|| Regex::new(r" ?https?://t\.co/[A-Za-z0-9]+").unwrap());
+
 /// pbs.twimg.com serves a reduced default size without size params; `name=orig`
 /// returns the original file (fxtwitter used to hand out the original
 /// directly, the syndication API does not). Non-twimg URLs pass through
 /// unchanged.
 fn original_twimg_url(url: &str) -> String {
-    if url.starts_with("https://pbs.twimg.com/")
-        && (url.ends_with(".jpg") || url.ends_with(".png"))
+    if url.starts_with("https://pbs.twimg.com/") && (url.ends_with(".jpg") || url.ends_with(".png"))
    {
        format!("{url}?name=orig")
    } else {
@@ -363,24 +356,23 @@ mod tests {
        match &fetched.media[0] {
            Media::Illustration { url, .. } => {
                // Photo URL is rewritten to request the original file.
-                assert_eq!(
-                    url,
-                    "https://pbs.twimg.com/media/photo.jpg?name=orig"
-                );
+                assert_eq!(url, "https://pbs.twimg.com/media/photo.jpg?name=orig");
            }
            other => panic!("expected illustration, got {other:?}"),
        }
        match &fetched.media[1] {
-            Media::Video { url, thumbnail_url, .. } => {
+            Media::Video {
+                url, thumbnail_url, ..
+            } => {
                assert_eq!(url, "https://video.twimg.com/v.mp4");
                assert_eq!(thumbnail_url, "https://pbs.twimg.com/thumb.jpg");
            }
            other => panic!("expected video, got {other:?}"),
        }
        assert!(
-            fetched
-                .caption
-                .contains("<a href=\"https://x.com/author_handle\">Display Name</a>: a &amp; b &lt;c&gt;"),
+            fetched.caption.contains(
+                "<a href=\"https://x.com/author_handle\">Display Name</a>: a &amp; b &lt;c&gt;"
+            ),
            "caption: {}",
            fetched.caption
        );
@@ -411,13 +403,12 @@ mod tests {

    #[test]
    fn syndication_text_strips_trailing_media_short_link() {
-        // Real syndication shape: the media short link sits after the visible
-        // text, and display_text_range marks where it begins.
+        // Real syndication shape: the appended media short link sits after the
+        // visible text; the unmapped t.co link is stripped by content.
        let raw = serde_json::json!({
            "__typename": "Tweet",
            "id_str": "1",
            "text": "hello world https://t.co/abc123",
-            "display_text_range": [0, 11],
            "user": { "name": "N", "screen_name": "h" },
            "mediaDetails": []
        });
@@ -427,8 +418,31 @@ mod tests {
    }

    #[test]
-    fn syndication_text_strips_trailing_short_link_without_range() {
-        // No display_text_range: the regex fallback removes the trailing link.
+    fn syndication_text_strips_trailing_link_regardless_of_index_units() {
+        // Real tweet 2084567054481571919: the visible text is 30 code points
+        // but 41 UTF-16 units, and the two endpoints historically reported
+        // display_text_range in different units (UTF-16 on syndication, code
+        // points on GraphQL). The FxEmbed-style content-based strip ignores
+        // the range entirely, so the appended media link is removed for any
+        // response shape.
+        let text = "妄想𝑨𝒅𝒅𝒊𝒄𝒕𝒊𝒐𝒏…🩷💚❤️\n#ゼンゼロ　#zzzero https://t.co/XnIi83EkEB";
+        let visible = "妄想𝑨𝒅𝒅𝒊𝒄𝒕𝒊𝒐𝒏…🩷💚❤️\n#ゼンゼロ　#zzzero";
+        let raw = serde_json::json!({
+            "__typename": "Tweet",
+            "id_str": "2084567054481571919",
+            "text": text,
+            "user": { "name": "N", "screen_name": "h" },
+            "mediaDetails": []
+        });
+        let tweet = Tweet::from_syndication_json(&raw.to_string()).unwrap();
+        assert_eq!(tweet.text, visible, "left a partial link");
+        assert!(!tweet.caption().contains("t.co"));
+    }
+
+    #[test]
+    fn syndication_text_strips_trailing_short_link_without_entities() {
+        // No URL entities at all: the leftover t.co link is stripped by the
+        // content regex.
        let raw = serde_json::json!({
            "__typename": "Tweet",
            "id_str": "1",
@@ -449,7 +463,6 @@ mod tests {
            "__typename": "Tweet",
            "id_str": "1",
            "text": "Test Tweet with @mentionThis $twtr https://t.co/RzmrQ6wAzD #hashtag https://t.co/9r69akA484",
-            "display_text_range": [0, 67],
            "user": { "name": "N", "screen_name": "h" },
            "entities": {
                "urls": [{
@@ -469,25 +482,47 @@ mod tests {
    }

    #[test]
-    fn syndication_text_keeps_unmapped_short_links() {
-        // No entity mapping for the embedded link: it stays as-is. Only the
-        // trailing media link is stripped.
+    fn syndication_text_strips_unmapped_short_links() {
+        // FxEmbed parity: short links without an entity mapping (appended
+        // media link, embedded unmapped links) are stripped, not kept.
        let raw = serde_json::json!({
            "__typename": "Tweet",
            "id_str": "1",
            "text": "check https://t.co/abc123 #tag https://t.co/def456",
-            "display_text_range": [0, 30],
            "user": { "name": "N", "screen_name": "h" },
            "mediaDetails": []
        });
        let tweet = Tweet::from_syndication_json(&raw.to_string()).unwrap();
-        assert_eq!(tweet.text, "check https://t.co/abc123 #tag");
+        assert_eq!(tweet.text, "check #tag");
    }

    #[test]
-    fn syndication_text_utf16_display_range_keeps_multibyte() {
-        // display_text_range is in UTF-16 units; a Japanese text must not be
-        // sliced by UTF-8 bytes.
+    fn syndication_text_drops_internal_web_status_links() {
+        // FxEmbed parity: a mapped link expanding to an internal
+        // x.com/i/web/status/... page (reply/quote plumbing) is removed
+        // instead of being shown.
+        let raw = serde_json::json!({
+            "__typename": "Tweet",
+            "id_str": "1",
+            "text": "see https://t.co/xyz1234567 for context",
+            "user": { "name": "N", "screen_name": "h" },
+            "entities": {
+                "urls": [{
+                    "url": "https://t.co/xyz1234567",
+                    "expanded_url": "https://x.com/i/web/status/9876543210",
+                    "display_url": "x.com/i/web/status/9876543210"
+                }]
+            },
+            "mediaDetails": []
+        });
+        let tweet = Tweet::from_syndication_json(&raw.to_string()).unwrap();
+        assert_eq!(tweet.text, "see  for context");
+        assert!(!tweet.caption().contains("t.co"));
+    }
+
+    #[test]
+    fn syndication_text_keeps_multibyte_text() {
+        // Text-only tweet: no short links, the multibyte text is untouched.
        let text = "コミティア落ちたので、明日は行きません。🙏ごめんなさい";
        let units: Vec<u16> = text.encode_utf16().collect();
        assert_eq!(units.len(), 28);
@@ -495,7 +530,6 @@ mod tests {
            "__typename": "Tweet",
            "id_str": "1",
            "text": text,
-            "display_text_range": [0, 28],
            "user": { "name": "N", "screen_name": "h" },
            "mediaDetails": []
        });
@@ -547,6 +581,9 @@ mod tests {
    async fn live_fetch_deleted_tweet_is_not_found() {
        // Deleted tweet: the syndication endpoint answers with errors.
        let result = fetch("0").await;
-        assert!(matches!(result, Err(FetchError::NotFound)), "got {result:?}");
+        assert!(
+            matches!(result, Err(FetchError::NotFound)),
+            "got {result:?}"
+        );
    }
 }
@@ -9,10 +9,6 @@ pub struct SyndicationTweet {
    pub user: SyndicationUser,
    #[serde(default)]
    pub possibly_sensitive: Option<bool>,
-    /// Visible-text span; the raw `text` field has the appended media short
-    /// link after it. Indices are Unicode code points (not UTF-16 units).
-    #[serde(default, rename = "display_text_range")]
-    pub display_text_range: Option<[usize; 2]>,
    #[serde(default)]
    pub entities: SyndicationEntities,
    #[serde(default, rename = "mediaDetails")]
@@ -1,6 +1,6 @@
 [package]
 name = "xmedia-bot"
-version = "1.0.5"
+version = "1.0.8"
 edition = "2024"

 [dependencies]
@@ -18,4 +18,8 @@ rusqlite = { version = "0.32", features = ["bundled"] }
 rand = "0.8"
 tempfile = "3"
 parking_lot = "0.12"
+png = "0.18"
+zune-jpeg = "0.5"
+fast_image_resize = "6"
+jpeg-encoder = "0.7"
 x-media = { path = "../x-media" }
@@ -10,6 +10,8 @@ pub struct Config {
    pub admin_ids: Vec<i64>,
    /// EDIT_MESSAGE_TTL_SECONDS, default 86400 (24h).
    pub edit_message_ttl: Duration,
+    /// LINK_CACHE_TTL_SECONDS, default 604800 (7 days).
+    pub link_cache_ttl: Duration,
    // Webhook settings (moved out of main; names/defaults unchanged).
    pub webhook_enabled: bool,
    pub webhook_url: Option<url::Url>,
@@ -22,37 +24,42 @@ pub struct Config {
 impl Config {
    pub fn load() -> Config {
        let admin_ids = env::var("BOT_ADMIN")
-        .ok()
-        .map(|s| {
-            s.split(',')
-                .filter_map(|part| part.trim().parse::<i64>().ok())
-                .collect()
-        })
-        .unwrap_or_default();
+            .ok()
+            .map(|s| {
+                s.split(',')
+                    .filter_map(|part| part.trim().parse::<i64>().ok())
+                    .collect()
+            })
+            .unwrap_or_default();

-    let edit_message_ttl = env::var("EDIT_MESSAGE_TTL_SECONDS")
-        .ok()
-        .and_then(|s| s.parse::<u64>().ok())
-        .map(Duration::from_secs)
-        .unwrap_or(Duration::from_secs(86400));
+        let edit_message_ttl = env::var("EDIT_MESSAGE_TTL_SECONDS")
+            .ok()
+            .and_then(|s| s.parse::<u64>().ok())
+            .map(Duration::from_secs)
+            .unwrap_or(Duration::from_secs(86400));

-    let webhook_enabled = env::var("WEBHOOK")
-        .is_ok_and(|v| matches!(v.to_lowercase().as_str(), "true" | "yes" | "1"));
-    let webhook_url = env::var("WEBHOOK_URL").ok().and_then(|s| s.parse().ok());
-    let webhook_listen = env::var("WEBHOOK_LISTEN").ok().and_then(|s| s.parse().ok());
-    let webhook_port = env::var("WEBHOOK_PORT").ok().and_then(|s| s.parse().ok());
-    // Empty strings count as unset (e.g. `-e WEBHOOK_CERT=` to disable a
-    // value that would otherwise come from `.env`).
-    let webhook_cert = env::var("WEBHOOK_CERT")
-        .ok()
-        .filter(|s| !s.is_empty());
-    let webhook_secret_token = env::var("WEBHOOK_SECRET_TOKEN")
-        .ok()
-        .filter(|s| !s.is_empty());
+        let link_cache_ttl = env::var("LINK_CACHE_TTL_SECONDS")
+            .ok()
+            .and_then(|s| s.parse::<u64>().ok())
+            .map(Duration::from_secs)
+            .unwrap_or(Duration::from_secs(7 * 24 * 3600));
+
+        let webhook_enabled = env::var("WEBHOOK")
+            .is_ok_and(|v| matches!(v.to_lowercase().as_str(), "true" | "yes" | "1"));
+        let webhook_url = env::var("WEBHOOK_URL").ok().and_then(|s| s.parse().ok());
+        let webhook_listen = env::var("WEBHOOK_LISTEN").ok().and_then(|s| s.parse().ok());
+        let webhook_port = env::var("WEBHOOK_PORT").ok().and_then(|s| s.parse().ok());
+        // Empty strings count as unset (e.g. `-e WEBHOOK_CERT=` to disable a
+        // value that would otherwise come from `.env`).
+        let webhook_cert = env::var("WEBHOOK_CERT").ok().filter(|s| !s.is_empty());
+        let webhook_secret_token = env::var("WEBHOOK_SECRET_TOKEN")
+            .ok()
+            .filter(|s| !s.is_empty());

        Config {
            admin_ids,
            edit_message_ttl,
+            link_cache_ttl,
            webhook_enabled,
            webhook_url,
            webhook_listen,
@@ -0,0 +1,37 @@
+//! Shared SQLite plumbing for the three tables in `data/task_queue.db`
+//! (`tasks` in queue.rs, `chat_state` in state.rs, `link_cache` in
+//! link_cache.rs).
+//!
+//! Every operation opens its own short-lived connection with a busy timeout:
+//! handler tasks enqueue while workers lease/update rows concurrently, and
+//! without the timeout a concurrent write fails immediately with SQLITE_BUSY
+//! and the operation is lost. All I/O runs inside `spawn_blocking` via
+//! [`with_conn`] — rusqlite connections are not Send-friendly to hold across
+//! an await point, and blocking the async executor stalls every handler.
+
+use rusqlite::Connection;
+use std::time::Duration;
+
+/// Opens the shared DB with a busy timeout.
+pub fn open_db(path: &str) -> rusqlite::Result<Connection> {
+    let conn = Connection::open(path)?;
+    conn.busy_timeout(Duration::from_secs(5))?;
+    Ok(conn)
+}
+
+/// Runs `f` against a fresh connection on a blocking thread, returning the
+/// closure's result. Owns the `spawn_blocking` + `expect` ceremony shared by
+/// every table access; the caller maps errors to its own log line.
+pub async fn with_conn<T, F>(path: &str, f: F) -> rusqlite::Result<T>
+where
+    T: Send + 'static,
+    F: FnOnce(&mut Connection) -> rusqlite::Result<T> + Send + 'static,
+{
+    let path = path.to_string();
+    tokio::task::spawn_blocking(move || {
+        let mut conn = open_db(&path)?;
+        f(&mut conn)
+    })
+    .await
+    .expect("db worker panicked")
+}
@@ -1,9 +1,11 @@
 use crate::config::Config;
+use crate::link_cache::{CachedMediaKind, CachedPost, LinkCache};
 use crate::queue::PersistentTaskQueue;
 use crate::send::{self, MediaItemPayload, Task};
-use crate::state::{ChatStore, unix_now};
+use crate::state::{ChatData, ChatStore, unix_now};
 use std::collections::HashSet;
 use std::sync::LazyLock;
+use teloxide::RequestError;
 use teloxide::prelude::*;
 use teloxide::types::{
    CallbackQuery, ChatAction, ChatId, ChatKind, InlineQuery, InlineQueryResult,
@@ -11,35 +13,58 @@ use teloxide::types::{
    MessageEntityKind, MessageId, ParseMode, Recipient, ReplyParameters,
 };
 use teloxide::utils::command::BotCommands;
-use teloxide::RequestError;
+use tokio::sync::Semaphore;
 use x_media::media::Media;

-pub static CHAT_STORE: LazyLock<ChatStore> = LazyLock::new(|| {
-    ChatStore::open("data/task_queue.db").expect("failed to open chat store")
-});
+pub static CHAT_STORE: LazyLock<ChatStore> =
+    LazyLock::new(|| ChatStore::open("data/task_queue.db").expect("failed to open chat store"));
 pub static TASK_QUEUE: LazyLock<PersistentTaskQueue> =
    LazyLock::new(|| PersistentTaskQueue::new("data/task_queue.db"));
+pub static LINK_CACHE: LazyLock<LinkCache> =
+    LazyLock::new(|| LinkCache::open("data/task_queue.db"));
 pub static CONFIG: LazyLock<Config> = LazyLock::new(Config::load);

+/// Cap on concurrent per-URL processing. teloxide dispatches updates to a
+/// per-chat worker that handles them sequentially, so a batch-forward of many
+/// messages would otherwise be processed one at a time (fetch + send each,
+/// roughly a second per message). Moving the work into spawned tasks trades
+/// per-chat reply ordering for throughput; the semaphore bounds how many run
+/// at once so a big burst cannot hammer Telegram's rate limits.
+static URL_TASKS: LazyLock<Semaphore> = LazyLock::new(|| Semaphore::new(8));
+
 #[derive(BotCommands, Clone)]
-#[command(rename_rule = "snake_case", description = "")]
+#[command(
+    rename_rule = "snake_case",
+    description = "Turn X/Pixiv/Bluesky links into media messages"
+)]
 enum Command {
-    #[command(description = "")]
+    #[command(description = "Get started")]
    Start,
-    #[command(description = "")]
+    #[command(description = "Show command help")]
    Help,
-    #[command(description = "", parse_with = "split")]
+    #[command(
+        description = "Set forward channel (@channel or ID)",
+        parse_with = "split"
+    )]
    SetForwardChannel(String),
-    #[command(description = "")]
+    #[command(description = "Remove forward channel")]
    RemoveForwardChannel,
-    #[command(description = "")]
+    #[command(description = "Toggle edit-before-forward")]
    EditBeforeForward,
-    #[command(description = "", parse_with = "split")]
+    #[command(
+        description = "Reply with [] to save as template",
+        parse_with = "split"
+    )]
    SetTemplate(String),
-    #[command(description = "")]
+    #[command(description = "Show chat state (debug)")]
    BotDict,
-    #[command(description = "", parse_with = "split")]
+    #[command(description = "Set site caption format", parse_with = "split")]
    SetFormat(String),
+    #[command(
+        description = "Clear link cache (admin; optional URL, else all)",
+        parse_with = "split"
+    )]
+    ClearCache(String),
 }

 async fn reply<T>(bot: Bot, message: Message, text: T) -> Result<Message, RequestError>
@@ -185,7 +210,11 @@ async fn set_forward_channel_handler(
    Ok(channel_id)
 }

-async fn execute_command(bot: &Bot, message: &Message, command: Command) -> Result<(), RequestError> {
+async fn execute_command(
+    bot: &Bot,
+    message: &Message,
+    command: Command,
+) -> Result<(), RequestError> {
    match command {
        Command::Start => {
            bot.send_message(message.chat.id, "Hello!").await?;
@@ -203,7 +232,8 @@ async fn execute_command(bot: &Bot, message: &Message, command: Command) -> Resu
                    "Add successfully.".to_string()
                }
                Err(SetForwardChannelError::EmptyParameter) => {
-                    "Receive empty parameter.\nYou should enter a channel id or username".to_string()
+                    "Receive empty parameter.\nYou should enter a channel id or username"
+                        .to_string()
                }
                Err(SetForwardChannelError::NotChannel) => {
                    "Given id / username is not a channel".to_string()
@@ -280,7 +310,9 @@ async fn execute_command(bot: &Bot, message: &Message, command: Command) -> Resu
        Command::SetFormat(arg) => {
            let chat_id = message.chat.id.0;
            let (site, format) = match arg.split_once(char::is_whitespace) {
-                Some((site, format)) if !format.trim().is_empty() => (site.trim(), format.trim().to_string()),
+                Some((site, format)) if !format.trim().is_empty() => {
+                    (site.trim(), format.trim().to_string())
+                }
                _ => {
                    reply(
                        bot.clone(),
@@ -305,10 +337,62 @@ async fn execute_command(bot: &Bot, message: &Message, command: Command) -> Resu
            CHAT_STORE.set(chat_id, &chat_data).await;
            reply(bot.clone(), message.clone(), "Format set.").await?;
        }
+        Command::ClearCache(arg) => {
+            let sender_id = message
+                .from
+                .as_ref()
+                .map(|user| user.id.0 as i64)
+                .unwrap_or(-1);
+            if !CONFIG.admin_ids.contains(&sender_id) {
+                reply(bot.clone(), message.clone(), "Admin only.").await?;
+                return Ok(());
+            }
+            let arg = arg.trim();
+            if arg.is_empty() {
+                let removed = LINK_CACHE.clear(None).await;
+                log::info!("cache cleared by {sender_id}: {removed} entries");
+                reply(
+                    bot.clone(),
+                    message.clone(),
+                    format!("Cleared {removed} cached entr{}.", plural(removed)),
+                )
+                .await?;
+            } else {
+                let key = match x_media::site::cache_key(arg) {
+                    Some(key) => key,
+                    None => {
+                        reply(
+                            bot.clone(),
+                            message.clone(),
+                            "Unrecognized link. Use a twitter/x, pixiv or bsky post URL.",
+                        )
+                        .await?;
+                        return Ok(());
+                    }
+                };
+                let removed = LINK_CACHE.clear(Some(&key)).await;
+                log::info!("cache entry cleared by {sender_id}: {key} ({removed} rows)");
+                reply(
+                    bot.clone(),
+                    message.clone(),
+                    format!(
+                        "Cleared cache for {arg} ({} entr{}).",
+                        removed,
+                        plural(removed)
+                    ),
+                )
+                .await?;
+            }
+        }
    }
    Ok(())
 }

+/// `""` for one, `"ies"` for anything else — "1 entry" / "2 entries".
+fn plural(n: usize) -> &'static str {
+    if n == 1 { "" } else { "ies" }
+}
+
 /// For locally produced media (encoded ugoira MP4) the thumbnail URL is a
 /// hotlink-protected remote URL Telegram may not fetch; let Telegram generate
 /// its own thumbnail instead.
@@ -330,18 +414,21 @@ fn media_to_payload(media: &Media, sensitive: bool) -> MediaItemPayload {
            media: media.url().to_string(),
            has_spoiler: sensitive,
            fallback_url,
+            file_id: false,
        },
        Media::Video { .. } => MediaItemPayload::Video {
            media: media.url().to_string(),
            has_spoiler: sensitive,
            thumbnail: thumbnail_for(media),
            fallback_url,
+            file_id: false,
        },
        Media::Animated { .. } => MediaItemPayload::Video {
            media: media.url().to_string(),
            has_spoiler: sensitive,
            thumbnail: thumbnail_for(media),
            fallback_url,
+            file_id: false,
        },
    }
 }
@@ -354,11 +441,154 @@ async fn enqueue_retry(task: Task, delay_seconds: f64) {
    }
 }

+/// Sends a task and handles the outcome: post-send actions on success, retry
+/// enqueue on retryable failure, reply + link-cache invalidation on
+/// permanent failure (a stale cached file id must not repeat forever).
+async fn dispatch_send(bot: Bot, message: &Message, task: &Task, url: &str) {
+    let result = match task {
+        Task::SendAnimation { .. } => send::send_animation(&bot, task).await,
+        Task::SendMediaSequence { .. } => send::send_media_sequence(&bot, task).await,
+        Task::ForwardMessages { .. } => unreachable!(),
+    };
+    match result {
+        Ok(message_ids) => {
+            log::info!("sent {} message(s) for {url}", message_ids.len());
+            send::post_send_actions(&bot, task, message_ids).await;
+        }
+        Err(send::SendError::Retryable {
+            delay_seconds,
+            task,
+        }) => {
+            log::info!("send for {url} failed, queued for retry in {delay_seconds:.1}s");
+            enqueue_retry(task, delay_seconds).await;
+            let _ = reply(bot, message.clone(), "Send failed. Task queued for retry.").await;
+        }
+        Err(send::SendError::Permanent {
+            message: err_message,
+            task,
+        }) => {
+            send::invalidate_cache(&task).await;
+            log::error!("send for {url} failed permanently: {err_message}");
+            let _ = reply(bot, message.clone(), format!("Send failed: {err_message}")).await;
+        }
+    }
+}
+
+/// Builds the send task from ready-made items, sharing the payload shape
+/// between the fresh-fetch and link-cache paths.
+#[allow(clippy::too_many_arguments)]
+fn build_send_task(
+    chat_data: &ChatData,
+    message: &Message,
+    source_url: String,
+    caption: String,
+    items: Vec<MediaItemPayload>,
+    cache_data: Option<CachedPost>,
+) -> Task {
+    let chat_id = message.chat.id.0;
+    if items.len() == 1 && matches!(items[0], MediaItemPayload::Animation { .. }) {
+        Task::SendAnimation {
+            chat_id,
+            reply_to_message_id: message.id.0 as i64,
+            caption,
+            animation: items.into_iter().next().unwrap(),
+            source_url,
+            edit_before_forward: chat_data.edit_before_forward,
+            forward_channel_id: chat_data.forward_channel_id,
+            notify_chat_id: Some(chat_id),
+            notify_message_id: Some(message.id.0 as i64),
+            cache_data,
+        }
+    } else {
+        Task::SendMediaSequence {
+            chat_id,
+            reply_to_message_id: message.id.0 as i64,
+            caption,
+            media_batches: send::chunk_media_items(items),
+            batch_index: 0,
+            sent_message_ids: vec![],
+            source_url,
+            edit_before_forward: chat_data.edit_before_forward,
+            forward_channel_id: chat_data.forward_channel_id,
+            notify_chat_id: Some(chat_id),
+            notify_message_id: Some(message.id.0 as i64),
+            cache_data,
+        }
+    }
+}
+
 async fn url_media(bot: Bot, message: &Message, url: &str) {
    let chat_id = message.chat.id.0;
-    if let Err(e) = bot.send_chat_action(ChatId(chat_id), ChatAction::Typing).await {
+    if let Err(e) = bot
+        .send_chat_action(ChatId(chat_id), ChatAction::Typing)
+        .await
+    {
        log::error!("send_chat_action failed: {e}");
    }
+
+    // Link cache: a post sent before is re-sent from Telegram file ids —
+    // no source-site request, no download, no upload. Keyed by the
+    // normalized post id so x.com / fxtwitter / /photo/N variants collide.
+    if let Some(key) = x_media::site::cache_key(url)
+        && let Some(cached) = LINK_CACHE.get(&key, CONFIG.link_cache_ttl).await
+    {
+        log::info!("link cache hit for {url}");
+        let chat_data = CHAT_STORE.get(chat_id).await;
+        let site = key.split(':').next().unwrap_or("unknown");
+        let format = chat_data
+            .message_format
+            .get(site)
+            .cloned()
+            .unwrap_or_default();
+        let caption = if format.is_empty() {
+            cached.caption.clone()
+        } else {
+            x_media::site::caption_from_fields(
+                &format,
+                "",
+                &cached.url,
+                &cached.author,
+                &cached.author_url,
+                &cached.title,
+                &cached.tags,
+            )
+        };
+        let items: Vec<MediaItemPayload> = cached
+            .media
+            .iter()
+            .map(|m| match m.kind {
+                CachedMediaKind::Photo => MediaItemPayload::Photo {
+                    media: m.file_id.clone(),
+                    has_spoiler: cached.sensitive,
+                    fallback_url: None,
+                    file_id: true,
+                },
+                CachedMediaKind::Video => MediaItemPayload::Video {
+                    media: m.file_id.clone(),
+                    has_spoiler: cached.sensitive,
+                    thumbnail: None,
+                    fallback_url: None,
+                    file_id: true,
+                },
+                CachedMediaKind::Animation => MediaItemPayload::Animation {
+                    media: m.file_id.clone(),
+                    has_spoiler: cached.sensitive,
+                    file_id: true,
+                },
+            })
+            .collect();
+        let task = build_send_task(
+            &chat_data,
+            message,
+            cached.url.clone(),
+            caption,
+            items,
+            Some(cached),
+        );
+        dispatch_send(bot, message, &task, url).await;
+        return;
+    }
+
    log::info!("fetching {url}");
    match x_media::site::fetch(url).await {
        // Unsupported links are ignored silently (Python parity).
@@ -368,7 +598,12 @@ async fn url_media(bot: Bot, message: &Message, url: &str) {
        // Retries exhausted: notify the user (Rust-only requirement 3).
        Err(e) => {
            log::error!("fetch {url}: {e}");
-            let _ = reply(bot, message.clone(), "Failed to fetch media from this link.").await;
+            let _ = reply(
+                bot,
+                message.clone(),
+                "Failed to fetch media from this link.",
+            )
+            .await;
        }
        Ok(Some(fetched)) => {
            if fetched.media.is_empty() {
@@ -388,66 +623,34 @@ async fn url_media(bot: Bot, message: &Message, url: &str) {
                .cloned()
                .unwrap_or_default();
            let caption = fetched.caption_with(&format);
-            let task = if fetched.media.len() == 1
-                && matches!(fetched.media[0], Media::Animated { .. })
-            {
-                Task::SendAnimation {
-                    chat_id,
-                    reply_to_message_id: message.id.0 as i64,
-                    caption: caption.clone(),
-                    animation: MediaItemPayload::Animation {
-                        media: fetched.media[0].url().to_string(),
-                        has_spoiler: fetched.sensitive,
-                    },
-                    source_url: fetched.source_url.clone(),
-                    edit_before_forward: chat_data.edit_before_forward,
-                    forward_channel_id: chat_data.forward_channel_id,
-                    notify_chat_id: Some(chat_id),
-                    notify_message_id: Some(message.id.0 as i64),
-                }
-            } else {
-                let items: Vec<MediaItemPayload> = fetched
-                    .media
-                    .iter()
-                    .map(|media| media_to_payload(media, fetched.sensitive))
-                    .collect();
-                Task::SendMediaSequence {
-                    chat_id,
-                    reply_to_message_id: message.id.0 as i64,
-                    caption: caption.clone(),
-                    media_batches: send::chunk_media_items(items),
-                    batch_index: 0,
-                    sent_message_ids: vec![],
-                    source_url: fetched.source_url.clone(),
-                    edit_before_forward: chat_data.edit_before_forward,
-                    forward_channel_id: chat_data.forward_channel_id,
-                    notify_chat_id: Some(chat_id),
-                    notify_message_id: Some(message.id.0 as i64),
-                }
-            };
-            let result = match &task {
-                Task::SendAnimation { .. } => send::send_animation(&bot, &task).await,
-                Task::SendMediaSequence { .. } => send::send_media_sequence(&bot, &task).await,
-                Task::ForwardMessages { .. } => unreachable!(),
-            };
-            match result {
-                Ok(message_ids) => {
-                    log::info!("sent {} message(s) for {url}", message_ids.len());
-                    send::post_send_actions(&bot, &task, message_ids).await;
-                }
-                Err(send::SendError::Retryable { delay_seconds, task }) => {
-                    log::info!("send for {url} failed, queued for retry in {delay_seconds:.1}s");
-                    enqueue_retry(task, delay_seconds).await;
-                    let _ = reply(bot, message.clone(), "Send failed. Task queued for retry.").await;
-                }
-                Err(send::SendError::Permanent {
-                    message: err_message,
-                    ..
-                }) => {
-                    log::error!("send for {url} failed permanently: {err_message}");
-                    let _ = reply(bot, message.clone(), format!("Send failed: {err_message}")).await;
-                }
-            }
+            // Raw render data for the link cache; the send fills in the
+            // Telegram file ids and persists the entry.
+            let cache_data = fetched
+                .render_fields()
+                .map(|(author, author_url, title, tags)| CachedPost {
+                    url: fetched.source_url.clone(),
+                    caption: fetched.caption.clone(),
+                    title: title.to_string(),
+                    author: author.to_string(),
+                    author_url: author_url.to_string(),
+                    tags: tags.to_string(),
+                    sensitive: fetched.sensitive,
+                    media: vec![],
+                });
+            let items: Vec<MediaItemPayload> = fetched
+                .media
+                .iter()
+                .map(|media| media_to_payload(media, fetched.sensitive))
+                .collect();
+            let task = build_send_task(
+                &chat_data,
+                message,
+                fetched.source_url.clone(),
+                caption,
+                items,
+                cache_data,
+            );
+            dispatch_send(bot, message, &task, url).await;
        }
    }
 }
@@ -463,7 +666,10 @@ pub async fn message_handler(bot: Bot, message: Message) -> Result<(), RequestEr
        .text()
        .map(|t| if t.len() > 120 { &t[..120] } else { t })
        .unwrap_or("<no text>");
-    log::info!("message from {sender} in {} (private={is_private}): {text_preview}", message.chat.id);
+    log::info!(
+        "message from {sender} in {} (private={is_private}): {text_preview}",
+        message.chat.id
+    );
    // URL/edit flows only run in private chats; commands run in any chat.
    if is_private && edit_message_handler(&bot, &message).await {
        return respond(());
@@ -481,7 +687,13 @@ pub async fn message_handler(bot: Bot, message: Message) -> Result<(), RequestEr
            log::info!("extracted {} URL(s): {urls:?}", urls.len());
        }
        for url in urls {
-            url_media(bot.clone(), &message, &url).await;
+            let bot = bot.clone();
+            let message = message.clone();
+            tokio::spawn(async move {
+                // Held for the whole task; the semaphore is never closed.
+                let _permit = URL_TASKS.acquire().await.expect("URL semaphore closed");
+                url_media(bot, &message, &url).await;
+            });
        }
    }
    respond(())
@@ -527,8 +739,8 @@ pub async fn inline_query_handler(bot: Bot, query: InlineQuery) -> Result<(), Re
                            thumbnail,
                            fetched.title.clone(),
                        )
-                            .caption(caption)
-                            .parse_mode(ParseMode::Html),
+                        .caption(caption)
+                        .parse_mode(ParseMode::Html),
                    ),
                    Media::Animated { .. } => InlineQueryResult::Mpeg4Gif(
                        InlineQueryResultMpeg4Gif::new(id, url, thumbnail)
@@ -560,7 +772,10 @@ pub async fn callback_query_handler(bot: Bot, query: CallbackQuery) -> Result<()
    let mut chat_data = CHAT_STORE.get(chat_id).await;
    let edit = chat_data.edit_message.get(&prompt_message_id).cloned();
    let Some(edit) = edit else {
-        log::info!("callback from {}: no edit record for prompt {prompt_message_id}", chat_id);
+        log::info!(
+            "callback from {}: no edit record for prompt {prompt_message_id}",
+            chat_id
+        );
        bot.answer_callback_query(callback_query_id)
            .text("Expired")
            .await?;
@@ -579,7 +794,10 @@ pub async fn callback_query_handler(bot: Bot, query: CallbackQuery) -> Result<()
    let Some(data) = data else {
        return respond(());
    };
-    log::info!("callback from {} on prompt {prompt_message_id}: {data}", chat_id);
+    log::info!(
+        "callback from {} on prompt {prompt_message_id}: {data}",
+        chat_id
+    );
    if data == "forward" {
        match chat_data.forward_channel_id {
            Some(channel_id) => {
@@ -605,7 +823,10 @@ pub async fn callback_query_handler(bot: Bot, query: CallbackQuery) -> Result<()
                        chat_data.edit_message.remove(&prompt_message_id);
                        CHAT_STORE.set(chat_id, &chat_data).await;
                    }
-                    Err(send::SendError::Retryable { delay_seconds, task }) => {
+                    Err(send::SendError::Retryable {
+                        delay_seconds,
+                        task,
+                    }) => {
                        log::info!("forward queued for retry in {delay_seconds:.1}s");
                        enqueue_retry(task, delay_seconds).await;
                        bot.answer_callback_query(callback_query_id)
@@ -0,0 +1,293 @@
+//! Persistent cache of successfully sent posts.
+//!
+//! After a media send succeeds, the raw render data plus the Telegram
+//! `file_id`s of the sent items are stored keyed by [`crate::site` cache
+//! key]. A repeated link is then answered entirely from local state — no
+//! re-fetch of the source site, no re-upload — and no media file is stored
+//! on disk (the file ids point at Telegram's servers). Entries expire after
+//! [`Config::link_cache_ttl`]; a stale entry is dropped lazily on read and
+//! by the periodic prune in `main`.
+
+use rusqlite::{Connection, params};
+use serde::{Deserialize, Serialize};
+use std::time::Duration;
+
+#[derive(Serialize, Deserialize, Clone, Debug, PartialEq)]
+#[serde(rename_all = "snake_case")]
+pub enum CachedMediaKind {
+    Photo,
+    Video,
+    Animation,
+}
+
+#[derive(Serialize, Deserialize, Clone, Debug)]
+pub struct CachedMedia {
+    pub kind: CachedMediaKind,
+    pub file_id: String,
+}
+
+/// Everything needed to re-send a post without touching the source site:
+/// the canonical URL, pre-escaped caption fields, and the file ids produced
+/// by the original successful send.
+#[derive(Serialize, Deserialize, Clone, Debug)]
+pub struct CachedPost {
+    pub url: String,
+    /// The site's built-in caption (used when the chat has no format
+    /// override).
+    pub caption: String,
+    pub title: String,
+    pub author: String,
+    pub author_url: String,
+    pub tags: String,
+    pub sensitive: bool,
+    pub media: Vec<CachedMedia>,
+}
+
+/// SQLite-backed cache sharing `data/task_queue.db` with the queue and chat
+/// state (same `open_db` pattern: busy timeout, `spawn_blocking` I/O).
+pub struct LinkCache {
+    db_path: String,
+}
+
+impl LinkCache {
+    pub fn open(db_path: &str) -> Self {
+        if let Ok(conn) = Connection::open(db_path)
+            && let Err(e) = conn.execute_batch(
+                "CREATE TABLE IF NOT EXISTS link_cache (url TEXT PRIMARY KEY, \
+                 payload TEXT NOT NULL, created_at REAL NOT NULL);",
+            )
+        {
+            log::error!("failed to initialize link cache schema: {e}");
+        }
+        Self {
+            db_path: db_path.to_string(),
+        }
+    }
+
+    /// Returns the cached post if present and not expired; a stale entry is
+    /// removed on the spot.
+    pub async fn get(&self, key: &str, ttl: Duration) -> Option<CachedPost> {
+        let key = key.to_string();
+        let ttl = ttl.as_secs_f64();
+        let result = crate::db::with_conn(&self.db_path, move |conn| {
+            let mut stmt =
+                conn.prepare("SELECT payload, created_at FROM link_cache WHERE url = ?1")?;
+            let mut rows = stmt.query(params![key])?;
+            let Some(row) = rows.next()? else {
+                return Ok(None);
+            };
+            let payload: String = row.get(0)?;
+            let created_at: f64 = row.get(1)?;
+            if now_f64() - created_at > ttl {
+                conn.execute("DELETE FROM link_cache WHERE url = ?1", params![key])?;
+                return Ok(None);
+            }
+            Ok(Some(serde_json::from_str::<CachedPost>(&payload).map_err(
+                |e| rusqlite::Error::ToSqlConversionFailure(Box::new(e)),
+            )?))
+        })
+        .await;
+        match result {
+            Ok(v) => v,
+            Err(e) => {
+                log::error!("link cache read failed: {e}");
+                None
+            }
+        }
+    }
+
+    pub async fn put(&self, key: &str, post: &CachedPost) {
+        let key = key.to_string();
+        let payload = serde_json::to_string(post).expect("cached post serializes");
+        let result = crate::db::with_conn(&self.db_path, move |conn| {
+            conn.execute(
+                "INSERT OR REPLACE INTO link_cache (url, payload, created_at) VALUES (?1, ?2, ?3)",
+                params![key, payload, now_f64()],
+            )?;
+            Ok(())
+        })
+        .await;
+        if let Err(e) = result {
+            log::error!("link cache write failed: {e}");
+        }
+    }
+
+    /// Drops an entry (e.g. a cached file id that turned out invalid).
+    pub async fn remove(&self, key: &str) {
+        let key = key.to_string();
+        let result = crate::db::with_conn(&self.db_path, move |conn| {
+            conn.execute("DELETE FROM link_cache WHERE url = ?1", params![key])?;
+            Ok(())
+        })
+        .await;
+        if let Err(e) = result {
+            log::error!("link cache delete failed: {e}");
+        }
+    }
+
+    /// Removes expired entries; returns how many were deleted.
+    pub async fn prune(&self, ttl: Duration) -> usize {
+        let cutoff = now_f64() - ttl.as_secs_f64();
+        let result = crate::db::with_conn(&self.db_path, move |conn| {
+            conn.execute(
+                "DELETE FROM link_cache WHERE created_at < ?1",
+                params![cutoff],
+            )
+        })
+        .await;
+        match result {
+            Ok(n) => n,
+            Err(e) => {
+                log::error!("link cache prune failed: {e}");
+                0
+            }
+        }
+    }
+
+    /// Deletes one entry (by normalized cache key) or the whole cache when
+    /// `key` is `None`. Returns how many rows were removed.
+    pub async fn clear(&self, key: Option<&str>) -> usize {
+        let key = key.map(str::to_string);
+        let result = crate::db::with_conn(&self.db_path, move |conn| match &key {
+            Some(key) => conn.execute("DELETE FROM link_cache WHERE url = ?1", params![key]),
+            None => conn.execute("DELETE FROM link_cache", []),
+        })
+        .await;
+        match result {
+            Ok(n) => n,
+            Err(e) => {
+                log::error!("link cache clear failed: {e}");
+                0
+            }
+        }
+    }
+}
+
+fn now_f64() -> f64 {
+    std::time::SystemTime::now()
+        .duration_since(std::time::UNIX_EPOCH)
+        .map(|d| d.as_secs_f64())
+        .unwrap_or(0.0)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn entry() -> CachedPost {
+        CachedPost {
+            url: "https://x.com/u/status/1".into(),
+            caption: "cap".into(),
+            title: "t".into(),
+            author: "a".into(),
+            author_url: "au".into(),
+            tags: "".into(),
+            sensitive: true,
+            media: vec![CachedMedia {
+                kind: CachedMediaKind::Photo,
+                file_id: "AgAC...".into(),
+            }],
+        }
+    }
+
+    #[tokio::test]
+    async fn put_get_roundtrip() {
+        let dir = tempfile::tempdir().unwrap();
+        let cache = LinkCache::open(dir.path().join("c.db").to_str().unwrap());
+        cache.put("twitter:1", &entry()).await;
+        let got = cache.get("twitter:1", Duration::from_secs(3600)).await;
+        assert!(got.is_some());
+        let got = got.unwrap();
+        assert_eq!(got.url, "https://x.com/u/status/1");
+        assert_eq!(got.media[0].file_id, "AgAC...");
+    }
+
+    #[tokio::test]
+    async fn expired_entry_removed_on_read() {
+        let dir = tempfile::tempdir().unwrap();
+        let cache = LinkCache::open(dir.path().join("c.db").to_str().unwrap());
+        cache.put("twitter:1", &entry()).await;
+        // Force the row into the past so a 1s TTL expires it.
+        {
+            let conn = Connection::open(dir.path().join("c.db")).unwrap();
+            conn.execute("UPDATE link_cache SET created_at = created_at - 100", [])
+                .unwrap();
+        }
+        assert!(
+            cache
+                .get("twitter:1", Duration::from_secs(1))
+                .await
+                .is_none()
+        );
+        assert!(
+            cache
+                .get("twitter:1", Duration::from_secs(3600))
+                .await
+                .is_none()
+        );
+    }
+
+    #[tokio::test]
+    async fn remove_and_prune() {
+        let dir = tempfile::tempdir().unwrap();
+        let cache = LinkCache::open(dir.path().join("c.db").to_str().unwrap());
+        cache.put("twitter:1", &entry()).await;
+        cache.put("pixiv:2", &entry()).await;
+        cache.remove("twitter:1").await;
+        assert!(
+            cache
+                .get("twitter:1", Duration::from_secs(3600))
+                .await
+                .is_none()
+        );
+        assert!(
+            cache
+                .get("pixiv:2", Duration::from_secs(3600))
+                .await
+                .is_some()
+        );
+        {
+            let conn = Connection::open(dir.path().join("c.db")).unwrap();
+            conn.execute("UPDATE link_cache SET created_at = created_at - 100", [])
+                .unwrap();
+        }
+        assert_eq!(cache.prune(Duration::from_secs(1)).await, 1);
+        assert!(
+            cache
+                .get("pixiv:2", Duration::from_secs(3600))
+                .await
+                .is_none()
+        );
+    }
+
+    #[tokio::test]
+    async fn clear_one_entry_or_all() {
+        let dir = tempfile::tempdir().unwrap();
+        let cache = LinkCache::open(dir.path().join("c.db").to_str().unwrap());
+        cache.put("twitter:1", &entry()).await;
+        cache.put("pixiv:2", &entry()).await;
+        // By key: only the matching row is removed.
+        assert_eq!(cache.clear(Some("twitter:1")).await, 1);
+        assert!(
+            cache
+                .get("twitter:1", Duration::from_secs(3600))
+                .await
+                .is_none()
+        );
+        assert!(
+            cache
+                .get("pixiv:2", Duration::from_secs(3600))
+                .await
+                .is_some()
+        );
+        // Whole cache: nothing left; removing an absent key deletes 0 rows.
+        assert_eq!(cache.clear(None).await, 1);
+        assert!(
+            cache
+                .get("pixiv:2", Duration::from_secs(3600))
+                .await
+                .is_none()
+        );
+        assert_eq!(cache.clear(None).await, 0);
+    }
+}
@@ -1,19 +1,22 @@
 use dotenv::dotenv;
 use teloxide::dptree::endpoint;
+use teloxide::prelude::*;
 use teloxide::stop::StopToken;
 use teloxide::types::{ChatId, InputFile, MessageId};
-use teloxide::update_listeners::{self, webhooks, UpdateListener};
-use teloxide::prelude::*;
+use teloxide::update_listeners::{self, UpdateListener, webhooks};
 use tokio::sync::watch;
 use x_media::site;

 mod config;
+mod db;
 mod handlers;
+mod link_cache;
+mod photo;
 mod queue;
 mod send;
 mod state;

-use handlers::{CHAT_STORE, CONFIG, TASK_QUEUE};
+use handlers::{CHAT_STORE, CONFIG, LINK_CACHE, TASK_QUEUE};

 /// Docker `stop` / `compose down` delivers SIGTERM, which teloxide's ctrlc
 /// handler (SIGINT only) never sees — without this the process would die
@@ -72,7 +75,10 @@ async fn main() {
    }

    // Edit-expiry sweep: clears the prompt's buttons once the record expires.
-    log::info!("edit-expiry sweep: every 300s, ttl {}", CONFIG.edit_message_ttl.as_secs());
+    log::info!(
+        "edit-expiry sweep: every 300s, ttl {}",
+        CONFIG.edit_message_ttl.as_secs()
+    );
    let (stop_tx, stop_rx) = watch::channel(false);
    {
        let bot = bot.clone();
@@ -85,11 +91,18 @@ async fn main() {
                }
                let ttl = CONFIG.edit_message_ttl;
                let removed = CHAT_STORE.prune_expired(ttl).await;
+                let pruned = LINK_CACHE.prune(CONFIG.link_cache_ttl).await;
+                if pruned > 0 {
+                    log::info!("link cache: pruned {pruned} expired entr(ies)");
+                }
                for (chat_id, prompt_message_id) in removed {
                    // If the prompt was already deleted, this fails with a
                    // 400 "message to edit not found" — log and ignore.
                    if let Err(e) = bot
-                        .edit_message_reply_markup(ChatId(chat_id), MessageId(prompt_message_id as i32))
+                        .edit_message_reply_markup(
+                            ChatId(chat_id),
+                            MessageId(prompt_message_id as i32),
+                        )
                        .await
                    {
                        log::info!("edit-expiry sweep: prompt message gone: {e}");
@@ -111,10 +124,7 @@ async fn main() {

    if CONFIG.webhook_enabled {
        log::info!("running in webhook mode");
-        let url = CONFIG
-            .webhook_url
-            .clone()
-            .expect("WEBHOOK_URL is not set");
+        let url = CONFIG.webhook_url.clone().expect("WEBHOOK_URL is not set");
        // `webhooks::axum` calls set_webhook itself (with the full options,
        // secret token included) — no explicit registration here.
        let listen = CONFIG.webhook_listen.expect("WEBHOOK_LISTEN is not set");
@@ -0,0 +1,527 @@
+//! Pure-Rust photo processing: brings a downloaded photo within Telegram's
+//! limits (width + height ≤ 10000 px, bytes ≤ 10 MiB) without ffmpeg.
+//!
+//! Stack: `png` (image-png) for PNG decode/encode, `zune-jpeg` for JPEG
+//! decode, `fast_image_resize` (Lanczos3) for downsampling, `jpeg-encoder`
+//! for JPEG output.
+//!
+//! Bit-depth rule: a PNG above 24 bits (32-bit RGBA or 16-bit per channel)
+//! is reduced to 24-bit RGB; 24-bit and lower depths are left untouched —
+//! gray stays gray, never upconverted. The only upconversion is palette
+//! expansion, which resampling requires. Alpha is flattened onto white (JPEG
+//! and 24-bit RGB have no alpha channel).
+
+use std::io::Write;
+
+use fast_image_resize as fir;
+use tempfile::NamedTempFile;
+
+/// Telegram rejects photos whose width + height exceed this limit
+/// (PHOTO_INVALID_DIMENSIONS). Verified empirically: 6300x3730 (sum 10030)
+/// fails, 6100x3900 (sum 10000) passes.
+pub const PHOTO_MAX_DIMENSION_SUM: u32 = 10000;
+/// Resize target with a safety margin so rounding cannot cross the cap.
+pub const PHOTO_TARGET_DIMENSION_SUM: u32 = 9900;
+/// Upload cap (bytes): files above this are not uploaded; the bot falls back
+/// to a smaller media URL instead.
+pub const MAX_UPLOAD_BYTES: u64 = 10 * 1024 * 1024;
+/// Decode budget (bytes): a larger intermediate buffer is not worth the peak
+/// memory; the photo degrades to the smaller URL instead.
+const MAX_DECODE_BYTES: u64 = 512 * 1024 * 1024;
+/// JPEG output quality (1-100).
+const JPEG_QUALITY: u8 = 90;
+
+/// What to upload for a downloaded photo.
+pub enum PhotoPrep {
+    /// Upload this file (the original when within limits, else the processed
+    /// copy).
+    Upload(NamedTempFile),
+    /// The photo cannot be brought within Telegram's limits — the caller
+    /// falls back to the item's smaller URL.
+    UseFallback,
+}
+
+/// A decoded image buffer tagged with its channel layout.
+#[derive(Debug)]
+enum PixBuf {
+    Gray(Vec<u8>),
+    GrayAlpha(Vec<u8>),
+    Rgb(Vec<u8>),
+}
+
+impl PixBuf {
+    fn pixel_type(&self) -> fir::PixelType {
+        match self {
+            PixBuf::Gray(_) => fir::PixelType::U8,
+            PixBuf::GrayAlpha(_) => fir::PixelType::U8x2,
+            PixBuf::Rgb(_) => fir::PixelType::U8x3,
+        }
+    }
+
+    fn into_vec(self) -> Vec<u8> {
+        match self {
+            PixBuf::Gray(v) | PixBuf::GrayAlpha(v) | PixBuf::Rgb(v) => v,
+        }
+    }
+}
+
+/// Entry point: detects the format and processes the photo if needed.
+pub fn prepare_photo(file: NamedTempFile) -> Result<PhotoPrep, String> {
+    let bytes = std::fs::read(file.path()).map_err(|e| format!("prepare read failed: {e}"))?;
+    if bytes.starts_with(b"\x89PNG\r\n\x1a\n") {
+        prepare_png(file, bytes)
+    } else if bytes.starts_with(&[0xFF, 0xD8, 0xFF]) {
+        prepare_jpeg(file, bytes)
+    } else {
+        log::warn!("photo in unsupported format; falling back to smaller media");
+        Ok(PhotoPrep::UseFallback)
+    }
+}
+
+/// Parses the PNG IHDR (bytes 8..26: signature + length + "IHDR" + width +
+/// height + bit depth + color type).
+fn parse_png_header(bytes: &[u8]) -> Option<(u32, u32, png::BitDepth, png::ColorType)> {
+    if !bytes.starts_with(b"\x89PNG\r\n\x1a\n") || bytes.len() < 26 {
+        return None;
+    }
+    let w = u32::from_be_bytes(bytes.get(16..20)?.try_into().ok()?);
+    let h = u32::from_be_bytes(bytes.get(20..24)?.try_into().ok()?);
+    let depth = match *bytes.get(24)? {
+        1 => png::BitDepth::One,
+        2 => png::BitDepth::Two,
+        4 => png::BitDepth::Four,
+        8 => png::BitDepth::Eight,
+        16 => png::BitDepth::Sixteen,
+        _ => return None,
+    };
+    let color = match *bytes.get(25)? {
+        0 => png::ColorType::Grayscale,
+        2 => png::ColorType::Rgb,
+        3 => png::ColorType::Indexed,
+        4 => png::ColorType::GrayscaleAlpha,
+        6 => png::ColorType::Rgba,
+        _ => return None,
+    };
+    Some((w, h, depth, color))
+}
+
+/// Output channels of a decoded frame for the given color type (post
+/// STRIP_16; palette expands to RGB).
+fn output_channels(color: png::ColorType) -> usize {
+    match color {
+        png::ColorType::Grayscale => 1,
+        png::ColorType::GrayscaleAlpha => 2,
+        png::ColorType::Rgb | png::ColorType::Indexed => 3,
+        png::ColorType::Rgba => 4,
+    }
+}
+
+/// The 32→24 rule: RGBA (32-bit) becomes RGB with alpha composited onto
+/// white; 16-bit per channel was already stripped to 8-bit at decode.
+fn flatten_rgba_to_rgb(rgba: &[u8]) -> Vec<u8> {
+    let mut rgb = Vec::with_capacity(rgba.len() / 4 * 3);
+    for px in rgba.chunks_exact(4) {
+        let a = px[3] as u32;
+        for v in &px[..3] {
+            // Over white: C = C*a/255 + 255*(1 - a/255).
+            let v = (*v as u32 * a + 255 * (255 - a)) / 255;
+            rgb.push(v.min(255) as u8);
+        }
+    }
+    rgb
+}
+
+/// Lanczos3 downsampling via fast_image_resize.
+fn resize_pix(pix: PixBuf, w: u32, h: u32, nw: u32, nh: u32) -> Result<PixBuf, String> {
+    let pixel_type = pix.pixel_type();
+    let src = fir::images::Image::from_vec_u8(w, h, pix.into_vec(), pixel_type)
+        .map_err(|e| format!("resize input: {e}"))?;
+    let mut dst = fir::images::Image::new(nw, nh, pixel_type);
+    let mut resizer = fir::Resizer::new();
+    let options = fir::ResizeOptions::default()
+        .resize_alg(fir::ResizeAlg::Convolution(fir::FilterType::Lanczos3));
+    resizer
+        .resize(&src, &mut dst, &options)
+        .map_err(|e| format!("resize: {e}"))?;
+    let buf = dst.into_vec();
+    Ok(match pixel_type {
+        fir::PixelType::U8 => PixBuf::Gray(buf),
+        fir::PixelType::U8x2 => PixBuf::GrayAlpha(buf),
+        _ => PixBuf::Rgb(buf),
+    })
+}
+
+fn encode_png(out: &mut Vec<u8>, pix: &PixBuf, w: u32, h: u32) -> Result<(), png::EncodingError> {
+    let (color, buf) = match pix {
+        PixBuf::Gray(v) => (png::ColorType::Grayscale, v.as_slice()),
+        PixBuf::GrayAlpha(v) => (png::ColorType::GrayscaleAlpha, v.as_slice()),
+        PixBuf::Rgb(v) => (png::ColorType::Rgb, v.as_slice()),
+    };
+    let mut encoder = png::Encoder::new(out, w, h);
+    encoder.set_color(color);
+    encoder.set_depth(png::BitDepth::Eight);
+    let mut writer = encoder.write_header()?;
+    writer.write_image_data(buf)?;
+    Ok(())
+}
+
+fn encode_jpeg(pix: &PixBuf, w: u32, h: u32) -> Result<Vec<u8>, String> {
+    use jpeg_encoder::{ColorType, Encoder};
+    let mut out = Vec::new();
+    let encoder = Encoder::new(&mut out, JPEG_QUALITY);
+    match pix {
+        PixBuf::Gray(v) => encoder
+            .encode(v, w as u16, h as u16, ColorType::Luma)
+            .map_err(|e| format!("jpeg encode: {e}"))?,
+        PixBuf::GrayAlpha(v) => {
+            // JPEG has no alpha: composite onto white, output as gray.
+            let gray: Vec<u8> = v
+                .chunks_exact(2)
+                .map(|px| {
+                    let (g, a) = (px[0] as u32, px[1] as u32);
+                    ((g * a + 255 * (255 - a)) / 255).min(255) as u8
+                })
+                .collect();
+            encoder
+                .encode(&gray, w as u16, h as u16, ColorType::Luma)
+                .map_err(|e| format!("jpeg encode: {e}"))?;
+        }
+        PixBuf::Rgb(v) => encoder
+            .encode(v, w as u16, h as u16, ColorType::Rgb)
+            .map_err(|e| format!("jpeg encode: {e}"))?,
+    }
+    Ok(out)
+}
+
+fn write_temp(bytes: &[u8], ext: &str) -> Result<NamedTempFile, String> {
+    let mut file = tempfile::Builder::new()
+        .suffix(&format!(".{ext}"))
+        .tempfile()
+        .map_err(|e| format!("temp file failed: {e}"))?;
+    file.as_file_mut()
+        .write_all(bytes)
+        .map_err(|e| format!("temp file write failed: {e}"))?;
+    Ok(file)
+}
+
+fn target_dims(w: u32, h: u32) -> (u32, u32) {
+    let scale = PHOTO_TARGET_DIMENSION_SUM as f64 / (w + h) as f64;
+    (
+        ((w as f64 * scale).round() as u32).max(1),
+        ((h as f64 * scale).round() as u32).max(1),
+    )
+}
+
+/// PNG branch: decode (16→8, palette→RGB; gray/GA stay), flatten RGBA to
+/// RGB, Lanczos-downscale beyond the dimension cap, encode PNG — a PNG still
+/// over the upload cap afterwards becomes JPEG.
+fn prepare_png(file: NamedTempFile, bytes: Vec<u8>) -> Result<PhotoPrep, String> {
+    let (w, h, _bit_depth, color_type) = parse_png_header(&bytes).ok_or("invalid PNG header")?;
+    let size_over = bytes.len() as u64 > MAX_UPLOAD_BYTES;
+    if w + h <= PHOTO_MAX_DIMENSION_SUM && !size_over {
+        return Ok(PhotoPrep::Upload(file));
+    }
+    log::info!(
+        "photo {w}x{h} ({_bit_depth:?} {color_type:?}, {} bytes) needs processing",
+        bytes.len()
+    );
+
+    let channels = output_channels(color_type);
+    if (w as u64) * (h as u64) * channels as u64 > MAX_DECODE_BYTES {
+        log::warn!("photo decode buffer exceeds the memory budget; falling back to smaller media");
+        return Ok(PhotoPrep::UseFallback);
+    }
+
+    // STRIP_16 drops 16-bit to 8-bit (the depth-reduction step); palette
+    // expands to RGB (resampling requires it). Gray and gray-alpha are kept.
+    let transforms = match color_type {
+        png::ColorType::Indexed => png::Transformations::EXPAND,
+        _ => png::Transformations::STRIP_16,
+    };
+    let mut decoder = png::Decoder::new(std::io::Cursor::new(&bytes));
+    decoder.set_transformations(transforms);
+    let mut reader = decoder
+        .read_info()
+        .map_err(|e| format!("png decode: {e}"))?;
+    let out_w = reader.info().width;
+    let out_h = reader.info().height;
+    let mut buf = vec![
+        0u8;
+        reader
+            .output_buffer_size()
+            .ok_or("png output buffer size")?
+    ];
+    reader
+        .next_frame(&mut buf)
+        .map_err(|e| format!("png frame: {e}"))?;
+
+    let mut pix = match color_type {
+        png::ColorType::Rgba => PixBuf::Rgb(flatten_rgba_to_rgb(&buf)),
+        png::ColorType::Grayscale => PixBuf::Gray(buf),
+        png::ColorType::GrayscaleAlpha => PixBuf::GrayAlpha(buf),
+        png::ColorType::Rgb | png::ColorType::Indexed => PixBuf::Rgb(buf),
+    };
+
+    let (mut w, mut h) = (out_w, out_h);
+    if w + h > PHOTO_MAX_DIMENSION_SUM {
+        let (nw, nh) = target_dims(w, h);
+        pix = resize_pix(pix, w, h, nw, nh)?;
+        (w, h) = (nw, nh);
+        log::info!("downscaled photo to {w}x{h} (Lanczos3)");
+    }
+
+    let mut png_bytes = Vec::new();
+    encode_png(&mut png_bytes, &pix, w, h).map_err(|e| format!("png encode: {e}"))?;
+    if png_bytes.len() as u64 <= MAX_UPLOAD_BYTES {
+        return Ok(PhotoPrep::Upload(write_temp(&png_bytes, "png")?));
+    }
+    log::info!("PNG still over the upload cap after processing; transcoding to JPEG");
+    let jpeg_bytes = encode_jpeg(&pix, w, h)?;
+    if jpeg_bytes.len() as u64 <= MAX_UPLOAD_BYTES {
+        return Ok(PhotoPrep::Upload(write_temp(&jpeg_bytes, "jpg")?));
+    }
+    log::warn!("processed photo still exceeds the upload cap; falling back to smaller media");
+    Ok(PhotoPrep::UseFallback)
+}
+
+/// JPEG branch: zune-jpeg decode → Lanczos downscale → jpeg-encoder output.
+fn prepare_jpeg(file: NamedTempFile, bytes: Vec<u8>) -> Result<PhotoPrep, String> {
+    let mut decoder = zune_jpeg::JpegDecoder::new(std::io::Cursor::new(&bytes));
+    // Decodes to RGB by default. Headers first so dimensions are known before
+    // the (potentially huge) pixel decode.
+    decoder
+        .decode_headers()
+        .map_err(|e| format!("jpeg headers: {e}"))?;
+    let info = decoder.info().ok_or("jpeg info unavailable")?;
+    let (w, h) = (info.width as u32, info.height as u32);
+    let size_over = bytes.len() as u64 > MAX_UPLOAD_BYTES;
+    if w + h <= PHOTO_MAX_DIMENSION_SUM && !size_over {
+        return Ok(PhotoPrep::Upload(file));
+    }
+    if (w as u64) * (h as u64) * 3 > MAX_DECODE_BYTES {
+        log::warn!("photo decode buffer exceeds the memory budget; falling back to smaller media");
+        return Ok(PhotoPrep::UseFallback);
+    }
+    let pixels = decoder.decode().map_err(|e| format!("jpeg decode: {e}"))?;
+    let mut pix = PixBuf::Rgb(pixels);
+    let (mut w, mut h) = (w, h);
+    if w + h > PHOTO_MAX_DIMENSION_SUM {
+        let (nw, nh) = target_dims(w, h);
+        pix = resize_pix(pix, w, h, nw, nh)?;
+        (w, h) = (nw, nh);
+        log::info!("downscaled jpeg to {w}x{h} (Lanczos3)");
+    }
+    let jpeg_bytes = encode_jpeg(&pix, w, h)?;
+    if jpeg_bytes.len() as u64 <= MAX_UPLOAD_BYTES {
+        return Ok(PhotoPrep::Upload(write_temp(&jpeg_bytes, "jpg")?));
+    }
+    log::warn!("processed photo still exceeds the upload cap; falling back to smaller media");
+    Ok(PhotoPrep::UseFallback)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn png_header(w: u32, h: u32, depth: u8, color: u8) -> Vec<u8> {
+        let mut bytes = b"\x89PNG\r\n\x1a\n\x00\x00\x00\rIHDR".to_vec();
+        bytes.extend(w.to_be_bytes());
+        bytes.extend(h.to_be_bytes());
+        bytes.extend([depth, color, 0, 0, 0]);
+        bytes
+    }
+
+    #[test]
+    fn parses_png_header() {
+        let bytes = png_header(8979, 5316, 16, 6); // 16-bit RGBA
+        let (w, h, depth, color) = parse_png_header(&bytes).unwrap();
+        assert_eq!((w, h), (8979, 5316));
+        assert_eq!(depth, png::BitDepth::Sixteen);
+        assert_eq!(color, png::ColorType::Rgba);
+
+        let (_, _, depth, color) = parse_png_header(&png_header(10, 10, 8, 0)).unwrap();
+        assert_eq!(depth, png::BitDepth::Eight);
+        assert_eq!(color, png::ColorType::Grayscale);
+
+        assert!(parse_png_header(b"not a png").is_none());
+    }
+
+    #[test]
+    fn flatten_rgba_to_rgb_composites_over_white() {
+        // opaque red stays red
+        assert_eq!(flatten_rgba_to_rgb(&[255, 0, 0, 255]), vec![255, 0, 0]);
+        // fully transparent → white
+        assert_eq!(flatten_rgba_to_rgb(&[0, 0, 0, 0]), vec![255, 255, 255]);
+        // half alpha red → (255+255)/2 = 255, (0*128 + 255*127)/255 = 127
+        let out = flatten_rgba_to_rgb(&[255, 0, 0, 128]);
+        assert_eq!(out[0], 255);
+        assert_eq!(out[1], 127);
+        assert_eq!(out[2], 127);
+    }
+
+    #[test]
+    fn target_dims_stay_under_the_cap() {
+        for (w, h) in [(12000u32, 7000u32), (10000, 10000), (8979, 5316)] {
+            let (nw, nh) = target_dims(w, h);
+            assert!(nw + nh <= PHOTO_MAX_DIMENSION_SUM, "{w}x{h} -> {nw}x{nh}");
+            assert!(nw >= 1 && nh >= 1);
+        }
+        // already within limits: no change expected from the caller, but the
+        // helper must not produce zero dimensions.
+        let (nw, nh) = target_dims(500, 400);
+        assert!(nw >= 1 && nh >= 1);
+    }
+
+    #[test]
+    fn resize_pix_changes_dimensions() {
+        // 300x200 RGB → 100x66
+        let buf: Vec<u8> = (0..300 * 200 * 3).map(|i| (i % 251) as u8).collect();
+        let resized = resize_pix(PixBuf::Rgb(buf), 300, 200, 100, 66).unwrap();
+        match resized {
+            PixBuf::Rgb(v) => assert_eq!(v.len(), 100 * 66 * 3),
+            other => panic!("expected rgb, got {other:?}"),
+        }
+    }
+
+    #[test]
+    fn png_encode_roundtrip_keeps_gray() {
+        let gray = vec![128u8; 4 * 4];
+        let mut out = Vec::new();
+        encode_png(&mut out, &PixBuf::Gray(gray), 4, 4).unwrap();
+        assert!(!out.is_empty());
+        let (_, _, depth, color) = parse_png_header(&out).unwrap();
+        assert_eq!(depth, png::BitDepth::Eight);
+        assert_eq!(color, png::ColorType::Grayscale);
+    }
+
+    #[test]
+    fn jpeg_encode_produces_bytes() {
+        let rgb = vec![128u8; 8 * 8 * 3];
+        let out = encode_jpeg(&PixBuf::Rgb(rgb), 8, 8).unwrap();
+        assert!(out.len() > 100);
+        assert!(out.starts_with(&[0xFF, 0xD8]));
+    }
+
+    /// Writes a small dimension-oversized PNG (9999x2 → sum 10001) to a temp
+    /// file and runs the full pipeline.
+    fn run_pipeline(w: u32, h: u32, color: png::ColorType, fill: u8) -> Result<PhotoPrep, String> {
+        let (channels, data): (usize, Vec<u8>) = match color {
+            png::ColorType::Grayscale => (1, vec![fill; (w * h) as usize]),
+            png::ColorType::Rgb => (3, vec![fill; (w * h * 3) as usize]),
+            _ => unreachable!(),
+        };
+        let mut bytes = Vec::new();
+        {
+            let mut encoder = png::Encoder::new(&mut bytes, w, h);
+            encoder.set_color(color);
+            encoder.set_depth(png::BitDepth::Eight);
+            let mut writer = encoder.write_header().unwrap();
+            writer.write_image_data(&data).unwrap();
+        }
+        assert_eq!(data.len(), channels * (w * h) as usize);
+
+        let mut file = tempfile::Builder::new().suffix(".png").tempfile().unwrap();
+        std::io::Write::write_all(file.as_file_mut(), &bytes).unwrap();
+        prepare_photo(file)
+    }
+
+    #[test]
+    fn pipeline_downscales_oversized_png_keeping_format() {
+        let prep = run_pipeline(9999, 2, png::ColorType::Rgb, 128).unwrap();
+        match prep {
+            PhotoPrep::Upload(file) => {
+                let out = std::fs::read(file.path()).unwrap();
+                let (w, h, depth, color) = parse_png_header(&out).unwrap();
+                assert!(w + h <= PHOTO_MAX_DIMENSION_SUM, "{w}x{h}");
+                assert_eq!(depth, png::BitDepth::Eight);
+                assert_eq!(color, png::ColorType::Rgb);
+            }
+            PhotoPrep::UseFallback => panic!("over-dimension PNG should have been resized"),
+        }
+    }
+
+    #[test]
+    fn pipeline_keeps_gray_png_gray() {
+        let prep = run_pipeline(9999, 2, png::ColorType::Grayscale, 200).unwrap();
+        match prep {
+            PhotoPrep::Upload(file) => {
+                let out = std::fs::read(file.path()).unwrap();
+                let (_, _, _, color) = parse_png_header(&out).unwrap();
+                assert_eq!(color, png::ColorType::Grayscale, "gray must not upconvert");
+            }
+            PhotoPrep::UseFallback => panic!("over-dimension gray PNG should have been resized"),
+        }
+    }
+
+    #[test]
+    fn pipeline_resizes_oversized_jpeg() {
+        // Build a small over-dimension JPEG with jpeg-encoder.
+        let (w, h) = (9999u16, 2u16);
+        let rgb = vec![90u8; (w as usize) * (h as usize) * 3];
+        let mut bytes = Vec::new();
+        {
+            let encoder = jpeg_encoder::Encoder::new(&mut bytes, 90);
+            encoder
+                .encode(&rgb, w, h, jpeg_encoder::ColorType::Rgb)
+                .unwrap();
+        }
+        let mut file = tempfile::Builder::new().suffix(".jpg").tempfile().unwrap();
+        std::io::Write::write_all(file.as_file_mut(), &bytes).unwrap();
+        match prepare_photo(file).unwrap() {
+            PhotoPrep::Upload(file) => {
+                let out = std::fs::read(file.path()).unwrap();
+                assert!(out.starts_with(&[0xFF, 0xD8]), "output must stay jpeg");
+                // 9999x2 downscaled: the buffer length tells the new dims.
+                assert!(out.len() > 100);
+            }
+            PhotoPrep::UseFallback => panic!("over-dimension JPEG should have been resized"),
+        }
+    }
+
+    #[test]
+    #[ignore = "heavy: generates a >10 MiB PNG (run explicitly)"]
+    fn pipeline_transcodes_oversized_png_to_jpeg() {
+        // 6000x4000 (sum 10000 — under the dimension cap) smooth gradient with
+        // small per-pixel noise: PNG-incompressible (delta filters defeated)
+        // but JPEG-friendly (DCT smooths the small noise). Verified with
+        // ffmpeg: 8000x6000 amp-5 variant is a 59 MB PNG / 3.3 MB JPEG.
+        let (w, h) = (6000u32, 4000u32);
+        let mut rng = 0x1234_5678_9abc_def0u64;
+        let mut data = Vec::with_capacity((w * h * 3) as usize);
+        for y in 0..h {
+            for x in 0..w {
+                let base = (x + y) * 255 / (w + h);
+                rng = rng
+                    .wrapping_mul(6364136223846793005)
+                    .wrapping_add(1442695040888963407);
+                let n = ((rng >> 33) % 11) as i32 - 5; // noise in [-5, 5]
+                let v = (base as i32 + n).clamp(0, 255) as u8;
+                data.extend_from_slice(&[v, v, v]);
+            }
+        }
+        let mut bytes = Vec::new();
+        {
+            let mut encoder = png::Encoder::new(&mut bytes, w, h);
+            encoder.set_color(png::ColorType::Rgb);
+            encoder.set_depth(png::BitDepth::Eight);
+            let mut writer = encoder.write_header().unwrap();
+            writer.write_image_data(&data).unwrap();
+        }
+        assert!(
+            bytes.len() as u64 > MAX_UPLOAD_BYTES,
+            "test needs a >10MiB PNG, got {}",
+            bytes.len()
+        );
+
+        let mut file = tempfile::Builder::new().suffix(".png").tempfile().unwrap();
+        std::io::Write::write_all(file.as_file_mut(), &bytes).unwrap();
+        match prepare_photo(file).unwrap() {
+            PhotoPrep::Upload(file) => {
+                let out = std::fs::read(file.path()).unwrap();
+                assert!(out.starts_with(&[0xFF, 0xD8]), "must transcode to JPEG");
+                assert!(out.len() as u64 <= MAX_UPLOAD_BYTES);
+            }
+            PhotoPrep::UseFallback => panic!("PNG over the byte cap must transcode to JPEG"),
+        }
+    }
+}
@@ -6,11 +6,11 @@
 //! replaced by dedicated columns.

 use parking_lot::Mutex;
-use rusqlite::{params, Connection};
+use rusqlite::{Connection, TransactionBehavior, params};
 use serde_json::Value;
 use std::pin::Pin;
-use std::sync::atomic::{AtomicBool, AtomicU64, Ordering};
 use std::sync::Arc;
+use std::sync::atomic::{AtomicBool, AtomicU64, Ordering};
 use std::time::{Duration, SystemTime, UNIX_EPOCH};
 use tokio::sync::Notify;
 use tokio::task::JoinHandle;
@@ -18,20 +18,20 @@ use tokio::task::JoinHandle;
 pub const MAX_RETRIES: u32 = 2;
 pub const LOCK_TTL_SECONDS: f64 = 120.0;

+/// Number of concurrent worker loops. Tasks are independent (retries and
+/// forward resumes); leases serialize row claims via SQLite transactions, so
+/// extra workers drain backlogs faster. Each worker can be mid-send to
+/// Telegram at the same time as handler tasks, so keep this modest.
+const QUEUE_WORKERS: usize = 4;
+
 /// What a handler returns instead of throwing. The payload it carries is the
 /// (possibly updated) task state to persist for the next attempt.
 pub enum QueueError {
    /// Reschedule with the given delay; after `MAX_RETRIES` attempts the task
    /// is dead-lettered instead.
-    Retryable {
-        delay_seconds: f64,
-        payload: Value,
-    },
+    Retryable { delay_seconds: f64, payload: Value },
    /// Give up now.
-    Permanent {
-        message: String,
-        payload: Value,
-    },
+    Permanent { message: String, payload: Value },
 }

 type BoxFuture<'a, T> = Pin<Box<dyn Future<Output = T> + Send + 'a>>;
@@ -42,7 +42,7 @@ pub struct PersistentTaskQueue {
    db_path: String,
    notify: Arc<Notify>,
    stop: Arc<AtomicBool>,
-    worker: Mutex<Option<JoinHandle<()>>>,
+    worker: Mutex<Vec<JoinHandle<()>>>,
    counter: AtomicU64,
 }

@@ -68,7 +68,7 @@ fn now_f64() -> f64 {
        .unwrap_or(0.0)
 }

-fn ensure_schema(conn: &Connection) -> rusqlite::Result<()> {
+fn ensure_schema(conn: &rusqlite::Connection) -> rusqlite::Result<()> {
    conn.execute_batch(
        "CREATE TABLE IF NOT EXISTS tasks (id TEXT PRIMARY KEY, payload TEXT NOT NULL, \
         run_after REAL NOT NULL, attempts INTEGER NOT NULL, status TEXT NOT NULL, \
@@ -96,12 +96,12 @@ impl PersistentTaskQueue {
            db_path: db_path.to_string(),
            notify: Arc::new(Notify::new()),
            stop: Arc::new(AtomicBool::new(false)),
-            worker: Mutex::new(None),
+            worker: Mutex::new(Vec::new()),
            counter: AtomicU64::new(0),
        }
    }

-    /// Starts the worker loop. Also recovers rows left `in_progress` by a
+    /// Starts the worker loops. Also recovers rows left `in_progress` by a
    /// previous process (lease expired).
    pub async fn start<H, F, D, G>(&self, handler: H, dead_letter: D)
    where
@@ -114,21 +114,25 @@ impl PersistentTaskQueue {
        let dead_letter: Arc<DeadLetter> =
            Arc::new(move |payload, message| Box::pin(dead_letter(payload, message)));
        self.recover_stale().await;
-        let worker = QueueWorker {
-            db_path: self.db_path.clone(),
-            notify: Arc::clone(&self.notify),
-            stop: Arc::clone(&self.stop),
-            handler,
-            dead_letter,
-        };
-        let worker = tokio::spawn(worker.run_loop());
-        *self.worker.lock() = Some(worker);
+        let mut handles = Vec::with_capacity(QUEUE_WORKERS);
+        for _ in 0..QUEUE_WORKERS {
+            let worker = QueueWorker {
+                db_path: self.db_path.clone(),
+                notify: Arc::clone(&self.notify),
+                stop: Arc::clone(&self.stop),
+                handler: Arc::clone(&handler),
+                dead_letter: Arc::clone(&dead_letter),
+            };
+            handles.push(tokio::spawn(worker.run_loop()));
+        }
+        *self.worker.lock() = handles;
    }

    pub async fn stop(&self) {
        self.stop.store(true, Ordering::Relaxed);
-        self.notify.notify_one();
-        if let Some(handle) = self.worker.lock().take() {
+        self.notify.notify_waiters();
+        let handles = std::mem::take(&mut *self.worker.lock());
+        for handle in handles {
            let _ = handle.await;
        }
    }
@@ -143,10 +147,8 @@ impl PersistentTaskQueue {
            self.counter.fetch_add(1, Ordering::Relaxed)
        );
        let payload = payload.to_string();
-        let db_path = self.db_path.clone();
        log::info!("enqueued {id} (run_after {run_after:.1})");
-        let result = tokio::task::spawn_blocking(move || -> rusqlite::Result<()> {
-            let conn = Connection::open(&db_path)?;
+        crate::db::with_conn(&self.db_path, move |conn| {
            conn.execute(
                "INSERT OR REPLACE INTO tasks (id, payload, run_after, attempts, status, locked_until, created_at) \
                 VALUES (?1, ?2, ?3, 0, 'pending', 0, ?4)",
@@ -154,25 +156,25 @@ impl PersistentTaskQueue {
            )?;
            Ok(())
        })
-        .await
-        .expect("queue insert worker panicked")?;
-        self.notify.notify_one();
-        Ok(result)
+        .await?;
+        // Wake every sleeping worker: with several workers the one that finds
+        // nothing due must not starve the newly inserted row.
+        self.notify.notify_waiters();
+        Ok(())
    }

    async fn recover_stale(&self) {
-        let db_path = self.db_path.clone();
-        tokio::task::spawn_blocking(move || -> rusqlite::Result<()> {
-            let conn = Connection::open(&db_path)?;
+        let result = crate::db::with_conn(&self.db_path, move |conn| {
            conn.execute(
                "UPDATE tasks SET status='pending', locked_until=0 WHERE status='in_progress' AND locked_until < ?1",
                params![now_f64()],
            )?;
            Ok(())
        })
-        .await
-        .expect("queue recovery worker panicked")
-        .unwrap_or_else(|e| log::error!("queue recovery failed: {e}"));
+        .await;
+        if let Err(e) = result {
+            log::error!("queue recovery failed: {e}");
+        }
    }
 }

@@ -204,13 +206,15 @@ impl QueueWorker {

    /// Leases the oldest due row (sets it `in_progress` with a lock TTL).
    async fn lease_next(&self) -> Option<LeasedRow> {
-        let db_path = self.db_path.clone();
-        tokio::task::spawn_blocking(move || -> rusqlite::Result<Option<LeasedRow>> {
-            let mut conn = Connection::open(&db_path)?;
-            let tx = conn.transaction()?;
+        let result = crate::db::with_conn(&self.db_path, |conn| {
+            // BEGIN IMMEDIATE: with several workers, a deferred transaction
+            // that read before another worker's lease commit would fail with
+            // SQLITE_BUSY_SNAPSHOT. Taking the write lock up front serializes
+            // leases and re-reads the freshest committed state.
+            let tx = conn.transaction_with_behavior(TransactionBehavior::Immediate)?;
            let now = now_f64();
            let row = tx.query_row(
-                "SELECT id, payload, attempts FROM tasks WHERE status='pending' AND run_after <= ?1 \
+                "SELECT id, payload, attempts FROM tasks WHERE status='pending' AND run_after <= ?1 AND locked_until <= ?1 \
                 ORDER BY run_after LIMIT 1",
                params![now],
                |r| {
@@ -240,31 +244,34 @@ impl QueueWorker {
                attempts,
            }))
        })
-        .await
-        .expect("queue lease worker panicked")
-        .unwrap_or_else(|e| {
-            log::error!("queue lease failed: {e}");
-            None
-        })
+        .await;
+        match result {
+            Ok(row) => row,
+            Err(e) => {
+                log::error!("queue lease failed: {e}");
+                None
+            }
+        }
    }

    async fn earliest_run_after(&self) -> Option<f64> {
-        let db_path = self.db_path.clone();
-        tokio::task::spawn_blocking(move || -> rusqlite::Result<Option<f64>> {
-            let conn = Connection::open(&db_path)?;
-            let mut stmt = conn.prepare("SELECT MIN(run_after) FROM tasks WHERE status='pending'")?;
+        let result = crate::db::with_conn(&self.db_path, |conn| {
+            let mut stmt =
+                conn.prepare("SELECT MIN(run_after) FROM tasks WHERE status='pending'")?;
            let mut rows = stmt.query([])?;
            match rows.next()? {
                Some(row) => Ok(row.get::<_, Option<f64>>(0)?),
                None => Ok(None),
            }
        })
-        .await
-        .expect("queue timing worker panicked")
-        .unwrap_or_else(|e| {
-            log::error!("queue timing query failed: {e}");
-            None
-        })
+        .await;
+        match result {
+            Ok(v) => v,
+            Err(e) => {
+                log::error!("queue timing query failed: {e}");
+                None
+            }
+        }
    }

    async fn process(&self, row: LeasedRow) {
@@ -311,34 +318,32 @@ impl QueueWorker {
    }

    async fn delete_row(&self, id: &str) {
-        let db_path = self.db_path.clone();
        let id = id.to_string();
-        tokio::task::spawn_blocking(move || -> rusqlite::Result<()> {
-            let conn = Connection::open(&db_path)?;
+        let result = crate::db::with_conn(&self.db_path, move |conn| {
            conn.execute("DELETE FROM tasks WHERE id = ?1", params![id])?;
            Ok(())
        })
-        .await
-        .expect("queue delete worker panicked")
-        .unwrap_or_else(|e| log::error!("queue delete failed: {e}"));
+        .await;
+        if let Err(e) = result {
+            log::error!("queue delete failed: {e}");
+        }
    }

    async fn reschedule(&self, id: &str, payload: Value, delay_seconds: f64, attempts: i32) {
-        let db_path = self.db_path.clone();
        let id = id.to_string();
        let payload = payload.to_string();
-        tokio::task::spawn_blocking(move || -> rusqlite::Result<()> {
-            let conn = Connection::open(&db_path)?;
+        let result = crate::db::with_conn(&self.db_path, move |conn| {
            conn.execute(
                "UPDATE tasks SET payload=?1, run_after=?2, attempts=?3, status='pending', locked_until=0 WHERE id=?4",
                params![payload, now_f64() + delay_seconds, attempts, id],
            )?;
            Ok(())
        })
-        .await
-        .expect("queue reschedule worker panicked")
-        .unwrap_or_else(|e| log::error!("queue reschedule failed: {e}"));
-        self.notify.notify_one();
+        .await;
+        if let Err(e) = result {
+            log::error!("queue reschedule failed: {e}");
+        }
+        self.notify.notify_waiters();
    }
 }

@@ -3,20 +3,21 @@
 //! URL is blocked by hotlink protection; the bot downloads the file itself
 //! and uploads it via multipart).

-use crate::handlers::{CHAT_STORE, TASK_QUEUE};
+use crate::handlers::{CHAT_STORE, LINK_CACHE, TASK_QUEUE};
+use crate::link_cache::{CachedMedia, CachedMediaKind, CachedPost};
+use crate::photo::{self, MAX_UPLOAD_BYTES, PhotoPrep};
 use crate::queue::QueueError;
 use crate::state::{EditMessage, unix_now};
 use rand::Rng;
 use serde::{Deserialize, Serialize};
 use std::collections::HashMap;
-use tempfile::NamedTempFile;
 use teloxide::prelude::*;
 use teloxide::types::{
-    ChatId, InlineKeyboardButton, InlineKeyboardMarkup, InputFile, InputMedia,
-    InputMediaAnimation, InputMediaPhoto, InputMediaVideo, Message, MessageId, ParseMode,
-    ReplyParameters,
+    ChatId, InlineKeyboardButton, InlineKeyboardMarkup, InputFile, InputMedia, InputMediaAnimation,
+    InputMediaPhoto, InputMediaVideo, Message, MessageId, ParseMode, ReplyParameters,
 };
 use teloxide::{ApiError, RequestError};
+use tempfile::NamedTempFile;
 use x_media::site::FetchError;

 #[derive(Serialize, Deserialize, Clone, Debug)]
@@ -29,6 +30,9 @@ pub enum MediaItemPayload {
        /// size limits.
        #[serde(default)]
        fallback_url: Option<String>,
+        /// `media` is a Telegram file id (link-cache hit), not a URL.
+        #[serde(default)]
+        file_id: bool,
    },
    Video {
        media: String,
@@ -36,10 +40,16 @@ pub enum MediaItemPayload {
        thumbnail: Option<String>,
        #[serde(default)]
        fallback_url: Option<String>,
+        /// `media` is a Telegram file id (link-cache hit), not a URL.
+        #[serde(default)]
+        file_id: bool,
    },
    Animation {
        media: String,
        has_spoiler: bool,
+        /// `media` is a Telegram file id (link-cache hit), not a URL.
+        #[serde(default)]
+        file_id: bool,
    },
 }

@@ -68,6 +78,10 @@ pub enum Task {
        forward_channel_id: Option<i64>,
        notify_chat_id: Option<i64>,
        notify_message_id: Option<i64>,
+        /// Raw render data captured on a cache miss; the send fills in the
+        /// Telegram file ids and persists the entry (see `link_cache`).
+        #[serde(default)]
+        cache_data: Option<CachedPost>,
    },
    SendAnimation {
        chat_id: i64,
@@ -79,6 +93,10 @@ pub enum Task {
        forward_channel_id: Option<i64>,
        notify_chat_id: Option<i64>,
        notify_message_id: Option<i64>,
+        /// Raw render data captured on a cache miss; the send fills in the
+        /// Telegram file id and persists the entry (see `link_cache`).
+        #[serde(default)]
+        cache_data: Option<CachedPost>,
    },
    ForwardMessages {
        from_chat_id: i64,
@@ -89,14 +107,119 @@ pub enum Task {
    },
 }

+impl Task {
+    fn cache_data(&self) -> Option<&CachedPost> {
+        match self {
+            Task::SendMediaSequence { cache_data, .. } | Task::SendAnimation { cache_data, .. } => {
+                cache_data.as_ref()
+            }
+            Task::ForwardMessages { .. } => None,
+        }
+    }
+
+    fn source_url(&self) -> Option<&str> {
+        match self {
+            Task::SendMediaSequence { source_url, .. } | Task::SendAnimation { source_url, .. } => {
+                Some(source_url)
+            }
+            Task::ForwardMessages { .. } => None,
+        }
+    }
+
+    /// True when the media payloads are Telegram file ids from the link cache
+    /// (a cached file id that goes permanently bad should be dropped so the
+    /// next request re-fetches).
+    fn is_cached_send(&self) -> bool {
+        self.cache_data().is_some_and(|c| !c.media.is_empty())
+    }
+}
+
+/// Telegram file id of the message's media, matched to the payload kind.
+fn file_id_of_message(message: &Message, item: &MediaItemPayload) -> Option<String> {
+    match item {
+        // `photo()` returns all sizes, smallest first — the largest carries
+        // the file id of the sent media.
+        MediaItemPayload::Photo { .. } => message
+            .photo()
+            .and_then(|sizes| sizes.last())
+            .map(|p| p.file.id.to_string()),
+        MediaItemPayload::Video { .. } => message.video().map(|v| v.file.id.to_string()),
+        MediaItemPayload::Animation { .. } => message.animation().map(|a| a.file.id.to_string()),
+    }
+}
+
+fn kind_of_item(item: &MediaItemPayload) -> CachedMediaKind {
+    match item {
+        MediaItemPayload::Photo { .. } => CachedMediaKind::Photo,
+        MediaItemPayload::Video { .. } => CachedMediaKind::Video,
+        MediaItemPayload::Animation { .. } => CachedMediaKind::Animation,
+    }
+}
+
+/// Collects the Telegram file ids of a sent media group, aligned to the
+/// batch's items.
+fn collect_file_ids(messages: &[Message], batch: &[MediaItemPayload], out: &mut Vec<CachedMedia>) {
+    for (message, item) in messages.iter().zip(batch.iter()) {
+        if let Some(file_id) = file_id_of_message(message, item) {
+            out.push(CachedMedia {
+                kind: kind_of_item(item),
+                file_id,
+            });
+        }
+    }
+}
+
+/// Persists a successful send under the post's cache key. Only runs for a
+/// fresh (non-resumed) task that carried raw cache data with no file ids yet.
+async fn cache_sent_task(task: &Task, media: Vec<CachedMedia>) {
+    let Some(cache_data) = task.cache_data() else {
+        return;
+    };
+    if !cache_data.media.is_empty() || media.is_empty() {
+        return;
+    }
+    let mut post = cache_data.clone();
+    post.media = media;
+    if let Some(key) = x_media::site::cache_key(&post.url) {
+        LINK_CACHE.put(&key, &post).await;
+        log::info!("cached send for {}", post.url);
+    }
+}
+
+/// Persists a lone animation send under the post's cache key.
+async fn cache_animation_send(task: &Task, message: &Message) {
+    if let Some(file_id) = message.animation().map(|a| a.file.id.to_string()) {
+        cache_sent_task(
+            task,
+            vec![CachedMedia {
+                kind: CachedMediaKind::Animation,
+                file_id,
+            }],
+        )
+        .await;
+    }
+}
+
+/// A cached Telegram file id failed permanently (stale/expired); drop the
+/// cache entry so the next request re-fetches instead of repeating it.
+pub async fn invalidate_cache(task: &Task) {
+    if task.is_cached_send()
+        && let Some(url) = task.source_url()
+        && let Some(key) = x_media::site::cache_key(url)
+    {
+        log::info!("removing stale link cache entry for {url}");
+        LINK_CACHE.remove(&key).await;
+    }
+}
+
 pub const MAX_MEDIA_GROUP: usize = 9;
-/// Upload cap (bytes): files above this are not uploaded; the bot falls back
-/// to a smaller media URL instead.
-pub const MAX_UPLOAD_BYTES: u64 = 10 * 1024 * 1024; // 10485760

 /// Splits media into batches of at most [`MAX_MEDIA_GROUP`] items.
 pub fn chunk_media_items<T: Clone>(items: Vec<T>) -> Vec<Vec<T>> {
-    items.chunks(MAX_MEDIA_GROUP).map(|chunk| chunk.to_vec()).collect()
+    items
+        .chunks(MAX_MEDIA_GROUP)
+        .map(|chunk| chunk.to_vec())
+        .collect()
 }

 /// Exponential backoff with jitter, capped at 30s.
@@ -109,12 +232,15 @@ pub fn retry_delay_seconds(attempts: u32) -> f64 {
 /// these errors are handled by the download-and-reupload fallback, NOT by a
 /// queue retry (resending the URL cannot succeed).
 pub fn is_media_fetch_failure(e: &ApiError) -> bool {
-    const MARKERS: [&str; 5] = [
+    const MARKERS: [&str; 6] = [
        "webpage_media_empty",
        "media_empty",
        "empty_web_media",
        "webpage_curl_failed",
        "timeout",
+        // Oversized photos (width + height > 10000 px) are rejected on URL
+        // sends too; route them to the download-and-resize fallback.
+        "PHOTO_INVALID_DIMENSIONS",
    ];
    let description = e.to_string().to_lowercase();
    MARKERS.iter().any(|marker| description.contains(marker))
@@ -129,31 +255,41 @@ pub fn is_size_error(e: &ApiError) -> bool {
        return true;
    }
    let description = e.to_string().to_lowercase();
-    ["too large", "too big"].iter().any(|marker| description.contains(marker))
+    ["too large", "too big"]
+        .iter()
+        .any(|marker| description.contains(marker))
 }

 /// Task-free classification of a Telegram request error. The callers attach
 /// the (updated) task when building a [`SendError`].
 pub enum Classification {
-    Retryable { delay_seconds: f64 },
-    Permanent { message: String },
+    Retryable {
+        delay_seconds: f64,
+    },
+    Permanent {
+        message: String,
+    },
    /// Handled by the download fallback, not a queue retry.
    MediaFetchFailure,
 }

 pub fn classify_request_error(e: &RequestError) -> Classification {
    match e {
-        RequestError::RetryAfter(seconds) => {
-            Classification::Retryable { delay_seconds: seconds.seconds() as f64 }
-        }
+        RequestError::RetryAfter(seconds) => Classification::Retryable {
+            delay_seconds: seconds.seconds() as f64,
+        },
        RequestError::Network(_) => Classification::Retryable {
            delay_seconds: retry_delay_seconds(0),
        },
        RequestError::Api(api) if is_media_fetch_failure(api) => Classification::MediaFetchFailure,
-        RequestError::Api(api) => Classification::Permanent { message: api.to_string() },
+        RequestError::Api(api) => Classification::Permanent {
+            message: api.to_string(),
+        },
        RequestError::MigrateToChatId(_)
        | RequestError::InvalidJson { .. }
-        | RequestError::Io(_) => Classification::Permanent { message: e.to_string() },
+        | RequestError::Io(_) => Classification::Permanent {
+            message: e.to_string(),
+        },
    }
 }

@@ -198,6 +334,32 @@ fn input_file_for(media: &str) -> Result<InputFile, String> {
    }
 }

+impl MediaItemPayload {
+    /// The input for a send: a cached file id goes out as `InputFile::file_id`
+    /// (no fetch, no upload), URLs go to Telegram, anything else is a local
+    /// path (transient upload fallback).
+    fn input_file(&self) -> Result<InputFile, String> {
+        match self {
+            MediaItemPayload::Photo {
+                media,
+                file_id: true,
+                ..
+            }
+            | MediaItemPayload::Video {
+                media,
+                file_id: true,
+                ..
+            }
+            | MediaItemPayload::Animation {
+                media,
+                file_id: true,
+                ..
+            } => Ok(InputFile::file_id(media.clone().into())),
+            _ => input_file_for(item_url(self)),
+        }
+    }
+}
+
 fn photo_media(file: InputFile, caption: Option<&str>, spoiler: bool) -> InputMedia {
    let mut photo = InputMediaPhoto::new(file).parse_mode(ParseMode::Html);
    if let Some(caption) = caption {
@@ -243,28 +405,23 @@ fn build_media_group(
        .map(|(i, item)| {
            let item_caption = if i == 0 { caption } else { None };
            Ok(match item {
-                MediaItemPayload::Photo {
-                    media,
-                    has_spoiler,
-                    ..
-                } => photo_media(input_file_for(media)?, item_caption, *has_spoiler),
+                MediaItemPayload::Photo { has_spoiler, .. } => {
+                    photo_media(item.input_file()?, item_caption, *has_spoiler)
+                }
                MediaItemPayload::Video {
-                    media,
                    has_spoiler,
                    thumbnail,
                    ..
                } => {
-                    let mut video = video_media(input_file_for(media)?, item_caption, *has_spoiler);
+                    let mut video = video_media(item.input_file()?, item_caption, *has_spoiler);
                    if let (Some(thumb), InputMedia::Video(v)) = (thumbnail, &mut video) {
                        *v = v.clone().thumbnail(input_file_for(thumb)?);
                    }
                    video
                }
-                MediaItemPayload::Animation {
-                    media,
-                    has_spoiler,
-                    ..
-                } => animation_media(input_file_for(media)?, item_caption, *has_spoiler),
+                MediaItemPayload::Animation { has_spoiler, .. } => {
+                    animation_media(item.input_file()?, item_caption, *has_spoiler)
+                }
            })
        })
        .collect()
@@ -289,13 +446,24 @@ fn sniff_ext(bytes: &[u8]) -> &'static str {
 }

 enum FallbackError {
-    Retryable { delay_seconds: f64 },
-    Permanent { message: String },
+    Retryable {
+        delay_seconds: f64,
+    },
+    Permanent {
+        message: String,
+    },
    /// The downloaded file exceeds the upload cap; the caller falls back to
    /// the item's smaller URL.
    MediaTooLarge,
 }

+/// Brings a downloaded photo within Telegram's limits via the pure-Rust
+/// chain in [`crate::photo`] (no ffmpeg): dimension cap / upload cap
+/// exceeded photos are decoded, downscaled with Lanczos3, PNG bit depth
+/// reduced (>24-bit → 24-bit RGB, ≤24-bit untouched) and transcoded to JPEG
+/// only if still too big. Anything that cannot be fixed falls back to the
+/// item's smaller URL.
+///
 /// Downloads one media item to a temp file (deleted on drop). Network errors
 /// are retryable; size over the upload cap and other download errors are not.
 async fn download_to_temp(item: &MediaItemPayload) -> Result<NamedTempFile, FallbackError> {
@@ -317,7 +485,9 @@ async fn download_to_temp(item: &MediaItemPayload) -> Result<NamedTempFile, Fall
            });
        }
    };
-    if bytes.len() as u64 > MAX_UPLOAD_BYTES {
+    // Photos are downloaded even over the cap so `prepare_photo` can
+    // downscale / transcode them; only videos/animations short-circuit.
+    if !matches!(item, MediaItemPayload::Photo { .. }) && bytes.len() as u64 > MAX_UPLOAD_BYTES {
        return Err(FallbackError::MediaTooLarge);
    }
    let ext = sniff_ext(&bytes);
@@ -390,11 +560,13 @@ async fn send_batch_via_upload(
    for (i, item) in batch.iter().enumerate() {
        let item_caption = if i == 0 { caption } else { None };
        // Size check before downloading/uploading: over the cap, use the
-        // smaller URL instead of the file.
+        // smaller URL instead of the file. Photos are exempt — they are
+        // downloaded and processed (downscale / PNG→JPEG) before uploading.
        let too_large = match x_media::site::media_size(item_url(item)).await {
            Ok(Some(size)) => size > MAX_UPLOAD_BYTES,
            _ => false,
        };
+        let too_large = too_large && !matches!(item, MediaItemPayload::Photo { .. });
        let media = if too_large {
            match item.fallback_url() {
                Some(url) => match media_from_url(item, url, item_caption) {
@@ -412,9 +584,46 @@ async fn send_batch_via_upload(
        } else {
            match download_to_temp(item).await {
                Ok(file) => {
-                    let path = file.path().to_path_buf();
-                    files.push(file);
-                    media_from_file(item, path, item_caption)
+                    // Telegram rejects photos wider+taller than 10000 px
+                    // combined (PHOTO_INVALID_DIMENSIONS): downscale the
+                    // downloaded file before uploading; photos that cannot be
+                    // brought within the limits degrade to the smaller URL.
+                    if matches!(item, MediaItemPayload::Photo { .. }) {
+                        // CPU-heavy (decode/resize/encode): run off the async
+                        // executor thread.
+                        let prep = tokio::task::spawn_blocking(move || photo::prepare_photo(file))
+                            .await
+                            .map_err(|e| FallbackError::Permanent {
+                                message: format!("photo worker panicked: {e}"),
+                            })?
+                            .map_err(|message| FallbackError::Permanent { message })?;
+                        match prep {
+                            PhotoPrep::Upload(upload) => {
+                                let path = upload.path().to_path_buf();
+                                files.push(upload);
+                                media_from_file(item, path, item_caption)
+                            }
+                            PhotoPrep::UseFallback => match item.fallback_url() {
+                                Some(url) => match media_from_url(item, url, item_caption) {
+                                    Ok(media) => media,
+                                    Err(message) => {
+                                        return Err(FallbackError::Permanent { message });
+                                    }
+                                },
+                                None => {
+                                    return Err(FallbackError::Permanent {
+                                        message:
+                                            "photo dimensions exceed Telegram limits and no smaller variant is available"
+                                                .into(),
+                                    });
+                                }
+                            },
+                        }
+                    } else {
+                        let path = file.path().to_path_buf();
+                        files.push(file);
+                        media_from_file(item, path, item_caption)
+                    }
                }
                Err(FallbackError::MediaTooLarge) => match item.fallback_url() {
                    Some(url) => match media_from_url(item, url, item_caption) {
@@ -436,14 +645,16 @@ async fn send_batch_via_upload(
    }
    let result = bot
        .send_media_group(ChatId(chat_id), items)
-        .reply_parameters(ReplyParameters::new(MessageId(reply_to as i32)).allow_sending_without_reply())
+        .reply_parameters(
+            ReplyParameters::new(MessageId(reply_to as i32)).allow_sending_without_reply(),
+        )
        .await;
    match result {
        Ok(messages) => Ok(messages),
        Err(e) => Err(match classify_request_error(&e) {
-            Classification::Retryable { delay_seconds } => FallbackError::Retryable {
-                delay_seconds,
-            },
+            Classification::Retryable { delay_seconds } => {
+                FallbackError::Retryable { delay_seconds }
+            }
            Classification::Permanent { message } => FallbackError::Permanent { message },
            Classification::MediaFetchFailure => FallbackError::Permanent {
                message: "upload failed".into(),
@@ -459,12 +670,14 @@ fn updated_sequence_task(task: &Task, batch_index: usize, sent_message_ids: Vec<
            reply_to_message_id,
            caption,
            media_batches,
+            batch_index: _,
+            sent_message_ids: _,
            source_url,
            edit_before_forward,
            forward_channel_id,
            notify_chat_id,
            notify_message_id,
-            ..
+            cache_data,
        } => Task::SendMediaSequence {
            chat_id: *chat_id,
            reply_to_message_id: *reply_to_message_id,
@@ -477,6 +690,7 @@ fn updated_sequence_task(task: &Task, batch_index: usize, sent_message_ids: Vec<
            forward_channel_id: *forward_channel_id,
            notify_chat_id: *notify_chat_id,
            notify_message_id: *notify_message_id,
+            cache_data: cache_data.clone(),
        },
        _ => unreachable!("updated_sequence_task requires a SendMediaSequence task"),
    }
@@ -501,9 +715,17 @@ pub async fn send_media_sequence(bot: &Bot, task: &Task) -> Result<Vec<i64>, Sen
    let chat_id = *chat_id;
    let reply_to = *reply_to_message_id;
    let mut sent = sent_message_ids.clone();
+    // File ids accumulated across batches for the link cache. Only a fresh
+    // (non-resumed) full send populates the cache.
+    let mut cached_media: Vec<CachedMedia> = Vec::new();
+    let fresh_send = *batch_index == 0 && sent.is_empty();
    for idx in *batch_index..media_batches.len() {
        let batch = &media_batches[idx];
-        let caption = if idx == 0 { Some(caption.as_str()) } else { None };
+        let caption = if idx == 0 {
+            Some(caption.as_str())
+        } else {
+            None
+        };
        let items = match build_media_group(batch, caption) {
            Ok(items) => items,
            Err(message) => {
@@ -515,7 +737,9 @@ pub async fn send_media_sequence(bot: &Bot, task: &Task) -> Result<Vec<i64>, Sen
        };
        match bot
            .send_media_group(ChatId(chat_id), items)
-            .reply_parameters(ReplyParameters::new(MessageId(reply_to as i32)).allow_sending_without_reply())
+            .reply_parameters(
+                ReplyParameters::new(MessageId(reply_to as i32)).allow_sending_without_reply(),
+            )
            .await
        {
            Ok(messages) => {
@@ -524,20 +748,19 @@ pub async fn send_media_sequence(bot: &Bot, task: &Task) -> Result<Vec<i64>, Sen
                    media_batches.len(),
                    batch.len()
                );
+                collect_file_ids(&messages, batch, &mut cached_media);
                sent.extend(messages.into_iter().map(|m| m.id.0 as i64));
            }
-            Err(RequestError::Api(api))
-                if is_media_fetch_failure(&api) || is_size_error(&api) =>
-            {
+            Err(RequestError::Api(api)) if is_media_fetch_failure(&api) || is_size_error(&api) => {
                log::info!(
                    "Telegram could not fetch media for batch {idx} ({}), downloading and reuploading",
-                    batch
-                        .first()
-                        .map(|item| item_url(item))
-                        .unwrap_or("?")
+                    batch.first().map(item_url).unwrap_or("?")
                );
                match send_batch_via_upload(bot, chat_id, reply_to, batch, caption).await {
-                    Ok(messages) => sent.extend(messages.into_iter().map(|m| m.id.0 as i64)),
+                    Ok(messages) => {
+                        collect_file_ids(&messages, batch, &mut cached_media);
+                        sent.extend(messages.into_iter().map(|m| m.id.0 as i64));
+                    }
                    Err(FallbackError::Retryable { delay_seconds }) => {
                        return Err(SendError::Retryable {
                            delay_seconds,
@@ -561,6 +784,9 @@ pub async fn send_media_sequence(bot: &Bot, task: &Task) -> Result<Vec<i64>, Sen
            }
        }
    }
+    if fresh_send {
+        cache_sent_task(task, cached_media).await;
+    }
    Ok(sent)
 }

@@ -576,7 +802,9 @@ async fn send_animation_inner(
        .send_animation(ChatId(chat_id), file)
        .caption(caption)
        .parse_mode(ParseMode::Html)
-        .reply_parameters(ReplyParameters::new(MessageId(reply_to as i32)).allow_sending_without_reply());
+        .reply_parameters(
+            ReplyParameters::new(MessageId(reply_to as i32)).allow_sending_without_reply(),
+        );
    if spoiler {
        request = request.has_spoiler(true);
    }
@@ -599,8 +827,7 @@ pub async fn send_animation(bot: &Bot, task: &Task) -> Result<Vec<i64>, SendErro
    let reply_to = *reply_to_message_id;
    let (media_url, has_spoiler) = match animation {
        MediaItemPayload::Animation {
-            media,
-            has_spoiler,
+            media, has_spoiler, ..
        } => (media, *has_spoiler),
        MediaItemPayload::Photo { .. } | MediaItemPayload::Video { .. } => {
            unreachable!("SendAnimation carries an Animation payload")
@@ -608,15 +835,20 @@ pub async fn send_animation(bot: &Bot, task: &Task) -> Result<Vec<i64>, SendErro
    };
    let url_file = match input_file_for(media_url) {
        Ok(file) => file,
-        Err(message) => return Err(SendError::Permanent { message, task: task.clone() }),
+        Err(message) => {
+            return Err(SendError::Permanent {
+                message,
+                task: task.clone(),
+            });
+        }
    };
-    match send_animation_inner(bot, chat_id, reply_to, caption, has_spoiler, url_file)
-        .await
-    {
-        Ok(message) => Ok(vec![message.id.0 as i64]),
-        Err(RequestError::Api(api))
-            if is_media_fetch_failure(&api) || is_size_error(&api) =>
-        {
+    match send_animation_inner(bot, chat_id, reply_to, caption, has_spoiler, url_file).await {
+        Ok(message) => {
+            let id = message.id.0 as i64;
+            cache_animation_send(task, &message).await;
+            Ok(vec![id])
+        }
+        Err(RequestError::Api(api)) if is_media_fetch_failure(&api) || is_size_error(&api) => {
            log::info!(
                "Telegram could not fetch animation URL, downloading and reuploading: {}",
                media_url
@@ -634,7 +866,11 @@ pub async fn send_animation(bot: &Bot, task: &Task) -> Result<Vec<i64>, SendErro
                    )
                    .await
                    {
-                        Ok(message) => Ok(vec![message.id.0 as i64]),
+                        Ok(message) => {
+                            let id = message.id.0 as i64;
+                            cache_animation_send(task, &message).await;
+                            Ok(vec![id])
+                        }
                        Err(e) => Err(classify_to_send_error(&e, task.clone())),
                    }
                }
@@ -652,25 +888,32 @@ pub async fn send_animation(bot: &Bot, task: &Task) -> Result<Vec<i64>, SendErro
                            )
                            .await
                            {
-                                Ok(message) => Ok(vec![message.id.0 as i64]),
+                                Ok(message) => {
+                                    let id = message.id.0 as i64;
+                                    cache_animation_send(task, &message).await;
+                                    Ok(vec![id])
+                                }
                                Err(e) => Err(classify_to_send_error(&e, task.clone())),
                            }
                        }
-                        Err(message) => {
-                            Err(SendError::Permanent { message, task: task.clone() })
-                        }
+                        Err(message) => Err(SendError::Permanent {
+                            message,
+                            task: task.clone(),
+                        }),
                    },
                    None => Err(SendError::Permanent {
                        message: "media too large".into(),
                        task: task.clone(),
                    }),
                },
-                Err(FallbackError::Retryable { delay_seconds }) => {
-                    Err(SendError::Retryable { delay_seconds, task: task.clone() })
-                }
-                Err(FallbackError::Permanent { message }) => {
-                    Err(SendError::Permanent { message, task: task.clone() })
-                }
+                Err(FallbackError::Retryable { delay_seconds }) => Err(SendError::Retryable {
+                    delay_seconds,
+                    task: task.clone(),
+                }),
+                Err(FallbackError::Permanent { message }) => Err(SendError::Permanent {
+                    message,
+                    task: task.clone(),
+                }),
            }
        }
        Err(e) => Err(classify_to_send_error(&e, task.clone())),
@@ -694,7 +937,11 @@ pub async fn forward_messages(bot: &Bot, task: &Task) -> Result<(), SendError> {
        .map(|id| MessageId(*id as i32))
        .collect::<Vec<_>>();
    match bot
-        .copy_messages(ChatId(*to_chat_id), ChatId(*from_chat_id), message_ids.clone())
+        .copy_messages(
+            ChatId(*to_chat_id),
+            ChatId(*from_chat_id),
+            message_ids.clone(),
+        )
        .await
    {
        Ok(_) => {
@@ -728,12 +975,18 @@ pub fn build_edit_markup(templates: &HashMap<String, String>) -> InlineKeyboardM

 /// Notifies a chat about a dead-lettered task (skips when `notify_chat_id` is
 /// absent).
-pub async fn notify_failure(bot: &Bot, chat_id: Option<i64>, message_id: Option<i64>, message: &str) {
+pub async fn notify_failure(
+    bot: &Bot,
+    chat_id: Option<i64>,
+    message_id: Option<i64>,
+    message: &str,
+) {
    let Some(chat_id) = chat_id else { return };
    let mut request = bot.send_message(ChatId(chat_id), message);
    if let Some(message_id) = message_id {
-        request = request
-            .reply_parameters(ReplyParameters::new(MessageId(message_id as i32)).allow_sending_without_reply());
+        request = request.reply_parameters(
+            ReplyParameters::new(MessageId(message_id as i32)).allow_sending_without_reply(),
+        );
    }
    if let Err(e) = request.await {
        log::error!("failed to notify about failed task: {e}");
@@ -743,38 +996,45 @@ pub async fn notify_failure(bot: &Bot, chat_id: Option<i64>, message_id: Option<
 /// After a successful send: either open the edit-before-forward prompt or
 /// forward to the configured channel (with retry/queue handling).
 pub async fn post_send_actions(bot: &Bot, task: &Task, message_ids: Vec<i64>) {
-    let (chat_id, reply_to, source_url, edit_before_forward, forward_channel_id, notify_chat_id, notify_message_id) =
-        match task {
-            Task::SendMediaSequence {
-                chat_id,
-                reply_to_message_id,
-                source_url,
-                edit_before_forward,
-                forward_channel_id,
-                notify_chat_id,
-                notify_message_id,
-                ..
-            }
-            | Task::SendAnimation {
-                chat_id,
-                reply_to_message_id,
-                source_url,
-                edit_before_forward,
-                forward_channel_id,
-                notify_chat_id,
-                notify_message_id,
-                ..
-            } => (
-                *chat_id,
-                *reply_to_message_id,
-                source_url.clone(),
-                *edit_before_forward,
-                *forward_channel_id,
-                *notify_chat_id,
-                *notify_message_id,
-            ),
-            Task::ForwardMessages { .. } => return,
-        };
+    let (
+        chat_id,
+        reply_to,
+        source_url,
+        edit_before_forward,
+        forward_channel_id,
+        notify_chat_id,
+        notify_message_id,
+    ) = match task {
+        Task::SendMediaSequence {
+            chat_id,
+            reply_to_message_id,
+            source_url,
+            edit_before_forward,
+            forward_channel_id,
+            notify_chat_id,
+            notify_message_id,
+            ..
+        }
+        | Task::SendAnimation {
+            chat_id,
+            reply_to_message_id,
+            source_url,
+            edit_before_forward,
+            forward_channel_id,
+            notify_chat_id,
+            notify_message_id,
+            ..
+        } => (
+            *chat_id,
+            *reply_to_message_id,
+            source_url.clone(),
+            *edit_before_forward,
+            *forward_channel_id,
+            *notify_chat_id,
+            *notify_message_id,
+        ),
+        Task::ForwardMessages { .. } => return,
+    };

    if edit_before_forward {
        let mut chat_data = CHAT_STORE.get(chat_id).await;
@@ -811,7 +1071,10 @@ pub async fn post_send_actions(bot: &Bot, task: &Task, message_ids: Vec<i64>) {
    }

    if let Some(channel_id) = forward_channel_id {
-        log::info!("forwarding {} message(s) to channel {channel_id}", message_ids.len());
+        log::info!(
+            "forwarding {} message(s) to channel {channel_id}",
+            message_ids.len()
+        );
        let forward_task = Task::ForwardMessages {
            from_chat_id: chat_id,
            to_chat_id: channel_id,
@@ -821,7 +1084,10 @@ pub async fn post_send_actions(bot: &Bot, task: &Task, message_ids: Vec<i64>) {
        };
        match forward_messages(bot, &forward_task).await {
            Ok(()) => {}
-            Err(SendError::Retryable { delay_seconds, task }) => {
+            Err(SendError::Retryable {
+                delay_seconds,
+                task,
+            }) => {
                let payload = serde_json::to_value(task).expect("task serializes");
                let run_after = std::time::SystemTime::now()
                    .duration_since(std::time::UNIX_EPOCH)
@@ -861,13 +1127,17 @@ pub async fn handle_task(payload: serde_json::Value) -> Result<(), QueueError> {
        Task::SendMediaSequence { .. } | Task::SendAnimation { .. } => {
            let message_ids = match send_media_or_animation(&bot, &task).await {
                Ok(ids) => ids,
-                Err(SendError::Retryable { delay_seconds, task }) => {
+                Err(SendError::Retryable {
+                    delay_seconds,
+                    task,
+                }) => {
                    return Err(QueueError::Retryable {
                        delay_seconds,
                        payload: serde_json::to_value(task).expect("task serializes"),
                    });
                }
                Err(SendError::Permanent { message, task }) => {
+                    invalidate_cache(&task).await;
                    return Err(QueueError::Permanent {
                        message,
                        payload: serde_json::to_value(task).expect("task serializes"),
@@ -879,7 +1149,10 @@ pub async fn handle_task(payload: serde_json::Value) -> Result<(), QueueError> {
        }
        Task::ForwardMessages { .. } => match forward_messages(&bot, &task).await {
            Ok(()) => Ok(()),
-            Err(SendError::Retryable { delay_seconds, task }) => Err(QueueError::Retryable {
+            Err(SendError::Retryable {
+                delay_seconds,
+                task,
+            }) => Err(QueueError::Retryable {
                delay_seconds,
                payload: serde_json::to_value(task).expect("task serializes"),
            }),
@@ -919,6 +1192,14 @@ pub async fn dead_letter_notify(payload: serde_json::Value, message: String) {
 mod tests {
    use super::*;

+    #[test]
+    fn oversized_photo_boundary() {
+        // The empirical Telegram limit: sum 10000 passes, 10001 fails.
+        assert!(crate::photo::PHOTO_MAX_DIMENSION_SUM == 10000);
+        assert!(6100 + 3900 <= crate::photo::PHOTO_MAX_DIMENSION_SUM);
+        assert!(6300 + 3730 > crate::photo::PHOTO_MAX_DIMENSION_SUM);
+    }
+
    #[test]
    fn chunk_media_items_sizes() {
        assert_eq!(chunk_media_items::<i32>(vec![]), Vec::<Vec<i32>>::new());
@@ -926,7 +1207,11 @@ mod tests {
        assert_eq!(chunk_media_items((0..10).collect()).len(), 2);
        assert_eq!(chunk_media_items((0..25).collect()).len(), 3);
        assert_eq!(chunk_media_items((0..25).collect())[2].len(), 7);
-        assert!(chunk_media_items((0..25).collect()).iter().all(|c| c.len() <= 9));
+        assert!(
+            chunk_media_items((0..25).collect())
+                .iter()
+                .all(|c| c.len() <= 9)
+        );
    }

    #[test]
@@ -950,7 +1235,10 @@ mod tests {
            let api = ApiError::Unknown(description.to_string());
            assert!(is_media_fetch_failure(&api), "{description}");
        }
-        for description in ["Bad Request: message is not modified", "Forbidden: bot was blocked by the user"] {
+        for description in [
+            "Bad Request: message is not modified",
+            "Forbidden: bot was blocked by the user",
+        ] {
            let api = ApiError::Unknown(description.to_string());
            assert!(!is_media_fetch_failure(&api), "{description}");
        }
@@ -971,7 +1259,10 @@ mod tests {
            assert!(is_size_error(&api), "{description}");
        }
        // Unrelated errors must not match.
-        for description in ["Bad Request: WEBPAGE_MEDIA_EMPTY", "Bad Request: message is not modified"] {
+        for description in [
+            "Bad Request: WEBPAGE_MEDIA_EMPTY",
+            "Bad Request: message is not modified",
+        ] {
            let api = ApiError::Unknown(description.to_string());
            assert!(!is_size_error(&api), "{description}");
        }
@@ -980,9 +1271,16 @@ mod tests {
    #[test]
    fn media_item_payload_fallback_url_serde_default() {
        // Old queued payloads without the field deserialize with None.
-        let json = serde_json::json!({"kind": "photo", "media": "https://a/b.jpg", "has_spoiler": false});
+        let json =
+            serde_json::json!({"kind": "photo", "media": "https://a/b.jpg", "has_spoiler": false});
        let photo: MediaItemPayload = serde_json::from_value(json).unwrap();
-        assert!(matches!(photo, MediaItemPayload::Photo { fallback_url: None, .. }));
+        assert!(matches!(
+            photo,
+            MediaItemPayload::Photo {
+                fallback_url: None,
+                ..
+            }
+        ));
        assert_eq!(photo.fallback_url(), None);
    }

@@ -1026,12 +1324,14 @@ mod tests {
                    media: "https://a/b.jpg".into(),
                    has_spoiler: true,
                    fallback_url: Some("https://a/b_small.jpg".into()),
+                    file_id: false,
                }],
                vec![MediaItemPayload::Video {
                    media: "https://a/v.mp4".into(),
                    has_spoiler: false,
                    thumbnail: Some("https://a/t.jpg".into()),
                    fallback_url: None,
+                    file_id: false,
                }],
            ],
            batch_index: 1,
@@ -1041,6 +1341,7 @@ mod tests {
            forward_channel_id: Some(333),
            notify_chat_id: Some(111),
            notify_message_id: Some(222),
+            cache_data: None,
        };
        let json = serde_json::to_value(&task).unwrap();
        assert_eq!(json["type"], "send_media_sequence");
@@ -1058,7 +1359,13 @@ mod tests {
                assert_eq!(sent_message_ids, vec![11, 12]);
                assert_eq!(forward_channel_id, Some(333));
                assert_eq!(media_batches.len(), 2);
-                assert!(matches!(media_batches[0][0], MediaItemPayload::Photo { has_spoiler: true, .. }));
+                assert!(matches!(
+                    media_batches[0][0],
+                    MediaItemPayload::Photo {
+                        has_spoiler: true,
+                        ..
+                    }
+                ));
            }
            other => panic!("expected SendMediaSequence, got {other:?}"),
        }
@@ -1070,6 +1377,7 @@ mod tests {
            media: "https://a/b.jpg".into(),
            has_spoiler: false,
            fallback_url: None,
+            file_id: false,
        };
        let json = serde_json::to_value(&photo).unwrap();
        assert_eq!(json["kind"], "photo");
@@ -2,7 +2,7 @@
 //! `data/task_queue.db`, shared with the task queue).

 use parking_lot::Mutex;
-use rusqlite::{params, Connection};
+use rusqlite::params;
 use serde::{Deserialize, Serialize};
 use std::collections::HashMap;
 use std::path::Path;
@@ -45,7 +45,9 @@ pub fn unix_now() -> i64 {
 }

 impl ChatStore {
-    /// Creates the parent directory and both tables (idempotent).
+    /// Creates the parent directory and the `chat_state` table (idempotent).
+    /// The shared `tasks` / `link_cache` tables are owned by `queue.rs` and
+    /// `link_cache.rs` respectively.
    pub fn open(path: &str) -> rusqlite::Result<Self> {
        if let Some(parent) = Path::new(path).parent()
            && !parent.as_os_str().is_empty()
@@ -53,12 +55,9 @@ impl ChatStore {
            std::fs::create_dir_all(parent)
                .map_err(|e| rusqlite::Error::ToSqlConversionFailure(Box::new(e)))?;
        }
-        let conn = Connection::open(path)?;
+        let conn = crate::db::open_db(path)?;
        conn.execute_batch(
-            "CREATE TABLE IF NOT EXISTS tasks (id TEXT PRIMARY KEY, payload TEXT NOT NULL, \
-             run_after REAL NOT NULL, attempts INTEGER NOT NULL, status TEXT NOT NULL, \
-             locked_until REAL NOT NULL, created_at REAL NOT NULL); \
-             CREATE TABLE IF NOT EXISTS chat_state (chat_id TEXT PRIMARY KEY, payload TEXT NOT NULL);",
+            "CREATE TABLE IF NOT EXISTS chat_state (chat_id TEXT PRIMARY KEY, payload TEXT NOT NULL);",
        )?;
        drop(conn);
        Ok(ChatStore {
@@ -71,18 +70,19 @@ impl ChatStore {
        if let Some(data) = self.cache.lock().get(&chat_id) {
            return data.clone();
        }
-        let db_path = self.db_path.clone();
-        let payload = tokio::task::spawn_blocking(move || -> rusqlite::Result<Option<String>> {
-            let conn = Connection::open(&db_path)?;
+        let chat_key = chat_id.to_string();
+        let payload = crate::db::with_conn(&self.db_path, move |conn| {
+            // Concurrent handler tasks (batch-forwards) may write chat_state
+            // while this read runs; the shared busy timeout handles the
+            // write-lock collision instead of failing the query.
            let mut stmt = conn.prepare("SELECT payload FROM chat_state WHERE chat_id = ?1")?;
-            let mut rows = stmt.query(params![chat_id.to_string()])?;
+            let mut rows = stmt.query(params![chat_key])?;
            match rows.next()? {
-                Some(row) => Ok(Some(row.get(0)?)),
+                Some(row) => Ok(Some(row.get::<_, String>(0)?)),
                None => Ok(None),
            }
        })
        .await
-        .expect("chat_state worker panicked")
        .unwrap_or_else(|e| {
            log::error!("chat_state read failed: {e}");
            None
@@ -97,18 +97,18 @@ impl ChatStore {
    pub async fn set(&self, chat_id: i64, data: &ChatData) {
        self.cache.lock().insert(chat_id, data.clone());
        let payload = serde_json::to_string(data).expect("chat state serializes");
-        let db_path = self.db_path.clone();
-        tokio::task::spawn_blocking(move || -> rusqlite::Result<()> {
-            let conn = Connection::open(&db_path)?;
+        let chat_id = chat_id.to_string();
+        let result = crate::db::with_conn(&self.db_path, move |conn| {
            conn.execute(
                "INSERT OR REPLACE INTO chat_state (chat_id, payload) VALUES (?1, ?2)",
-                params![chat_id.to_string(), payload],
+                params![chat_id, payload],
            )?;
            Ok(())
        })
-        .await
-        .expect("chat_state worker panicked")
-        .unwrap_or_else(|e| log::error!("chat_state write failed: {e}"));
+        .await;
+        if let Err(e) = result {
+            log::error!("chat_state write failed: {e}");
+        }
    }

    /// Removes edit-before-forward records whose `created_at + ttl` is in the
@@ -144,7 +144,10 @@ impl ChatStore {
            self.set(chat_id, &data).await;
        }
        if !removed.is_empty() {
-            log::info!("pruned {} expired edit-before-forward record(s)", removed.len());
+            log::info!(
+                "pruned {} expired edit-before-forward record(s)",
+                removed.len()
+            );
        }
        removed
    }
@@ -5,30 +5,25 @@ services:
    ports:
      - '80:80'
      - '443:443'
-    environment:
-      # Bare-IP access only.
-      # DEFAULT_HOST: 'bot.example.com'
    volumes:
      - /var/run/docker.sock:/tmp/docker.sock:ro
-      - ./nginx-certs:/etc/nginx/certs:ro
-      - ./nginx-vhost.d:/etc/nginx/vhost.d:ro
-      - ./nginx-html:/usr/share/nginx/html:ro
+      - certs:/etc/nginx/certs:ro
+      - html:/usr/share/nginx/html:ro
    networks: [proxy]
    labels:
-      - 'com.github.jrcs.letsencrypt_nginx_proxy_companion.nginx_proxy=true'
+      - 'com.github.nginx-proxy.nginx'
    container_name: nginx-proxy

  acme-companion:
    image: nginxproxy/acme-companion
    restart: always
    environment:
-      DEFAULT_EMAIL: 'admin@yoursfunny.top'
+      DEFAULT_EMAIL: ''
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock:ro
-      - ./nginx-certs:/etc/nginx/certs:rw
-      - ./nginx-vhost.d:/etc/nginx/vhost.d:rw
-      - ./nginx-html:/usr/share/nginx/html:rw
-      - ./nginx-acme:/etc/acme.sh
+      - certs:/etc/nginx/certs:rw
+      - html:/usr/share/nginx/html:rw
+      - acme:/etc/acme.sh
    networks: [proxy]
    container_name: acme-companion
    depends_on:
@@ -42,19 +37,17 @@ services:
      TELOXIDE_TOKEN: ''
      BOT_ADMIN: ''
      PIXIV_REFRESH_TOKEN: ''
-      # Optional: x.com session cookie (auth_token) — fetches NSFW tweets
-      # that the public syndication endpoint withholds.
      TWITTER_AUTH_TOKEN: ''
      EDIT_MESSAGE_TTL_SECONDS: '86400'
+      LINK_CACHE_TTL_SECONDS: '604800'
      RUST_LOG: 'info'
-      VIRTUAL_HOST: 'bot.example.com'
+      VIRTUAL_HOST: '<YOUR_DOMAIN>'
      VIRTUAL_PORT: '8443'
-      # LETSENCRYPT_HOST: 'bot.example.com'
+      # ACME_HOST: 'your.domain.com'
      WEBHOOK: 'true'
      WEBHOOK_LISTEN: '0.0.0.0'
      WEBHOOK_PORT: '8443'
-      WEBHOOK_URL: 'https://bot.example.com/'
-      # WEBHOOK_CERT: './cert/cert.pem'
+      WEBHOOK_URL: 'https://<YOUR_DOMAIN>/'
      WEBHOOK_SECRET_TOKEN: ''
    volumes:
      - ./data:/app/data
@@ -63,6 +56,11 @@ services:
      - nginx-proxy
    container_name: tgxmb

+volumes:
+  certs:
+  html:
+  acme:
+
 networks:
  proxy:
    name: proxy
@@ -5,9 +5,21 @@ if [ "$(id -u)" -eq '0' ]
 then
   USER_ID=${LOCAL_USER_ID:-9001}

-   useradd --shell /bin/bash -u ${USER_ID} -o -c "" -m user > /dev/null 2>&1
-   usermod -a -G root user > /dev/null 2>&1
-   chown -R `id -u user`:`id -u user` /app > /dev/null 2>&1
+   # `docker compose restart` / `docker restart` reuse the same container, so
+   # the overlay fs keeps the user created on first boot. A second `useradd`
+   # then fails with exit code 9, which would trip `set -e` and kill the
+   # container on every restart. Create only if missing; align the UID
+   # otherwise so LOCAL_USER_ID changes still apply.
+   if ! id user > /dev/null 2>&1
+   then
+      useradd --shell /bin/bash -u ${USER_ID} -o -c "" -m user > /dev/null 2>&1 || true
+   else
+      usermod -u ${USER_ID} -o user > /dev/null 2>&1 || true
+   fi
+   usermod -a -G root user > /dev/null 2>&1 || true
+   # Bind-mounted volumes may not support chown; a failure here must not kill
+   # the container either.
+   chown -R `id -u user`:`id -u user` /app > /dev/null 2>&1 || true

   export HOME=/home/user
   # setpriv (util-linux, present in bookworm-slim) replaces gosu: drop to the
Author	SHA1	Message	Date
YoursFunny	020e2d01a3	chore: bump version to 1.0.8	2026-08-07 16:23:40 +08:00
YoursFunny	3d6f8548c3	style: cargo fmt across the workspace Apply rustfmt to the 11 files that had drifted (86 hunks): x-media site modules (bsky/pixiv/twitter) and xmedia-bot (config/main/ photo/send). Formatting only - no semantic changes; full test suite still green.	2026-08-07 16:12:01 +08:00
YoursFunny	063e910473	feat: add admin-only /clear_cache command /clear_cache with no argument wipes the whole link_cache table; with a post URL it removes that single entry (normalized via site::cache_key so fxtwitter/mobile/photo variants collide with the write-side key). Non-admins get 'Admin only.'. LinkCache gains clear(Option<&str>) -> usize reporting removed rows.	2026-08-07 16:10:25 +08:00
YoursFunny	b0ced34b4c	refactor: share sqlite open/with_conn helpers in db.rs Converge the duplicated open_db (open + busy_timeout) and the spawn_blocking + expect ceremony that every table access repeated into one db.rs module. ChatStore no longer creates the tasks table (schema ownership: queue.rs owns tasks, state.rs chat_state, link_cache.rs link_cache). No schema or behavior change - all CREATE TABLE statements are byte-identical, IF NOT EXISTS stays idempotent, so existing data/task_queue.db files need no migration.	2026-08-07 16:00:12 +08:00
YoursFunny	4060a88031	fix: expand twitter short links like FxEmbed linkFixer Replace display_text_range slicing with FxEmbed-style content matching: expand mapped t.co links to their real URLs (dropping internal x.com/i/web/status pages), then strip every leftover t.co short link (appended media link, unmapped links). The old code cut by display_text_range, whose index unit differs per endpoint (UTF-16 on the syndication endpoint, code points in the GraphQL fallback), so slicing by either unit left a partial "https://t." caption tail on the other path. Content matching is unit-agnostic and also keeps user-posted/quote links at the end of the text that the trailing cut previously dropped.	2026-08-07 10:25:54 +08:00
YoursFunny	fb43441c56	feat: add command descriptions and document commands in README All bot commands now carry English descriptions, shown in the Telegram command menu and by /help (which prints Command::descriptions()). The README command table explains each command's arguments and behavior: forward channel (@channel or ID), edit-before-forward flow, template [] placeholder semantics and per-site caption format placeholders.	2026-08-06 21:21:28 +08:00
YoursFunny	bf628dc999	chore: drop label value in compose example	2026-08-06 20:45:35 +08:00
YoursFunny	de22aa9b4d	chore: leave DEFAULT_EMAIL blank in compose example	2026-08-06 20:03:56 +08:00
YoursFunny	65a9554173	bump version to 1.0.7	2026-08-06 18:49:08 +08:00
YoursFunny	e755785147	deploy: use named volumes for certs/html/acme, keep data bind mount certs, html and acme are shared across nginx-proxy, acme-companion and the acme-ip service, so they become named volumes (dropping the nginx- prefix). The vhost.d mount is removed: acme-companion only needs it with ACME_HTTP_CHALLENGE_LOCATION=true or letsencrypt_user_data, and users who customize nginx config can mount their own. ./data stays a bind mount so the SQLite state stays directly backup-able. README updated.	2026-08-06 17:22:05 +08:00
YoursFunny	5d5b6d56e7	chore: strip compose comments, document env vars in README compose files now carry a single comment: the commented ACME_HOST line (uncomment to enable domain cert issuance). Everything else moved to the README env table and the deployment sections, which explain ACME_HOST, DEFAULT_HOST and every other variable.	2026-08-06 17:07:50 +08:00
YoursFunny	d0fdf1c5da	deploy: default to ACME-issued certs, drop manual cert setup Domain deployment now uses ACME_HOST (acme-companion auto issue/renew) instead of the legacy LETSENCRYPT_HOST name. IP-only deployments can use acme.sh to obtain Let's Encrypt IP certificates (shortlived profile, ~7-day validity, http-01 only) instead of self-signed manual certs: documented the acme-ip service, first-issue command with install-cert into nginx-certs and nginx reload via docker socket. Removed the manual WEBHOOK_CERT flow and the ./cert volume from the compose example.	2026-08-06 16:48:52 +08:00
YoursFunny	1db4ecfafa	chore: use modern nginx-proxy label for acme-companion acme-companion prefers com.github.nginx-proxy.nginx over the legacy jrcs.letsencrypt_nginx_proxy_companion namespace (functions.sh checks the new label first, falls back to the old one).	2026-08-06 11:31:01 +08:00
YoursFunny	47039bbe2d	fix: make docker entrypoint restart-safe docker compose restart reuses the container, so the overlay fs keeps the user created on first boot; a second useradd fails with exit code 9 and set -e kills the container on every restart (crash loop, bot never comes back). Create the user only if missing, align UID otherwise, and never let chown failure on bind-mounted volumes kill the container. Also comment out nginx-proxy's empty environment block in the compose example: an empty mapping fails validation on newer compose versions (must be a mapping).	2026-08-06 11:10:52 +08:00
YoursFunny	bc954e6e0b	fix: handle oversized photos Telegram rejects with pure Rust processing	2026-08-06 10:17:29 +08:00
YoursFunny	f7cb809e5a	bump version to 1.0.6	2026-08-05 02:07:34 +08:00
YoursFunny	51b40cdb42	feat: cache sent media file ids for instant repeat sends	2026-08-05 02:06:30 +08:00
YoursFunny	ab2306002a	perf: handle batch-forwarded URLs concurrently with queue workers	2026-08-05 01:26:24 +08:00