feat(feeds): add configurable per-feed lifetime (TTL)

Replace the demo nightly KV wipe with a per-feed expiry. Feeds can be
given a lifetime at creation (and edited later); FEED_TTL_HOURS locks the
value server-side and greys out the UI field. Expired feeds stay visible
in admin (greyed, actions disabled), return 410 on rss/atom/entries, and
reject inbound emails. The scheduled handler now purges only expired
feeds (KV + R2 attachments) on an hourly global cron.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/routes/admin.tsx

@@ -279,6 +279,35 @@ const CopyFieldInline = ({ value }: CopyFieldInlineProps) => (
   </div>
 );
 
+function formatExpiry(expiresAt: number): { label: string; expired: boolean } {
+  const remaining = expiresAt - Date.now();
+  if (remaining <= 0) {
+    const h = Math.floor(-remaining / 3_600_000);
+    return {
+      label: h > 0 ? `Expired ${h}h ago` : "Just expired",
+      expired: true,
+    };
+  }
+  const h = Math.floor(remaining / 3_600_000);
+  if (h >= 48) {
+    return { label: `Expires in ${Math.floor(h / 24)}d`, expired: false };
+  }
+  const m = Math.floor((remaining % 3_600_000) / 60_000);
+  return {
+    label: h > 0 ? `Expires in ${h}h ${m}m` : `Expires in ${m}m`,
+    expired: false,
+  };
+}
+
+const ExpiryBadge = ({ expiresAt }: { expiresAt: number }) => {
+  const { label, expired } = formatExpiry(expiresAt);
+  return (
+    <span class={`pill ${expired ? "pill-expired" : "pill-expiry"}`}>
+      {label}
+    </span>
+  );
+};
+
 // Admin dashboard route
 app.get("/", async (c) => {
   // Type assertion for environment variables
@@ -396,6 +425,29 @@ app.get("/", async (c) => {
               </small>
             </div>
 
+            <div class="form-group">
+              <label for="lifetime_hours">
+                Lifetime (hours{env.FEED_TTL_HOURS ? "" : ", optional"})
+              </label>
+              <input
+                type="number"
+                id="lifetime_hours"
+                name="lifetime_hours"
+                min="1"
+                value={env.FEED_TTL_HOURS || ""}
+                disabled={!!env.FEED_TTL_HOURS}
+                placeholder={env.FEED_TTL_HOURS ? undefined : "No expiry"}
+              />
+              {env.FEED_TTL_HOURS ? (
+                <small>
+                  Feed lifetime is fixed to {env.FEED_TTL_HOURS}h by server
+                  configuration.
+                </small>
+              ) : (
+                <small>Leave empty for no expiry.</small>
+              )}
+            </div>
+
             <input type="hidden" id="language" name="language" value="en" />
             <input type="hidden" name="view" value={view} />
 
@@ -489,6 +541,7 @@ app.get("/", async (c) => {
                     <col data-col="email" style="width: 200px;" />
                     <col data-col="rss" style="width: 190px;" />
                     <col data-col="atom" style="width: 190px;" />
+                    <col data-col="expires" style="width: 130px;" />
                     <col data-col="actions" style="width: 170px;" />
                   </colgroup>
                   <thead>
@@ -606,6 +659,14 @@ app.get("/", async (c) => {
                           title="Resize"
                         ></div>
                       </th>
+                      <th class="th-resizable">
+                        <span>Expires</span>
+                        <div
+                          class="col-resizer"
+                          data-col="expires"
+                          title="Resize"
+                        ></div>
+                      </th>
                       <th class="th-resizable">
                         <span>Actions</span>
                         <div
@@ -632,10 +693,13 @@ app.get("/", async (c) => {
                       const descHover = clampText(feed.description || "", 1000);
                       const searchHaystack =
                         `${clampText(feed.title, 320)} ${feed.id} ${clampText(feed.description || "", 320)}`.toLowerCase();
+                      const isExpired =
+                        feed.expires_at !== undefined &&
+                        feed.expires_at <= Date.now();
 
                       return (
                         <tr
-                          class="feed-row"
+                          class={`feed-row${isExpired ? " feed-expired" : ""}`}
                           data-feed-id={feed.id}
                           data-search={searchHaystack}
                           data-sort-title={sortTitle}
@@ -679,20 +743,48 @@ app.get("/", async (c) => {
                           <td>
                             <CopyFieldInline value={atomUrl} />
                           </td>
+                          <td>
+                            {feed.expires_at ? (
+                              <ExpiryBadge expiresAt={feed.expires_at} />
+                            ) : (
+                              <span class="muted">—</span>
+                            )}
+                          </td>
                           <td>
                             <div class="row-actions">
-                              <a
-                                href={`/admin/feeds/${feed.id}/edit`}
-                                class="button button-small"
-                              >
-                                Edit
-                              </a>
-                              <a
-                                href={`/admin/feeds/${feed.id}/emails`}
-                                class="button button-small"
-                              >
-                                Emails
-                              </a>
+                              {isExpired ? (
+                                <>
+                                  <span
+                                    class="button button-small button-disabled"
+                                    aria-disabled="true"
+                                    tabindex={-1}
+                                  >
+                                    Edit
+                                  </span>
+                                  <span
+                                    class="button button-small button-disabled"
+                                    aria-disabled="true"
+                                    tabindex={-1}
+                                  >
+                                    Emails
+                                  </span>
+                                </>
+                              ) : (
+                                <>
+                                  <a
+                                    href={`/admin/feeds/${feed.id}/edit`}
+                                    class="button button-small"
+                                  >
+                                    Edit
+                                  </a>
+                                  <a
+                                    href={`/admin/feeds/${feed.id}/emails`}
+                                    class="button button-small"
+                                  >
+                                    Emails
+                                  </a>
+                                </>
+                              )}
                               <button
                                 type="button"
                                 class="button button-small button-danger button-delete"
@@ -738,10 +830,13 @@ app.get("/", async (c) => {
                 const descHover = clampText(feed.description || "", 1000);
                 const searchHaystack =
                   `${clampText(feed.title, 320)} ${feed.id} ${clampText(feed.description || "", 320)}`.toLowerCase();
+                const isExpired =
+                  feed.expires_at !== undefined &&
+                  feed.expires_at <= Date.now();
 
                 return (
                   <li
-                    class="feed-item card feed-row"
+                    class={`feed-item card feed-row${isExpired ? " feed-expired" : ""}`}
                     data-feed-id={feed.id}
                     data-search={searchHaystack}
                   >
@@ -749,6 +844,9 @@ app.get("/", async (c) => {
                       <h3 class="feed-title" title={titleHover}>
                         {titleDisplay}
                       </h3>
+                      {feed.expires_at && (
+                        <ExpiryBadge expiresAt={feed.expires_at} />
+                      )}
                       {feed.description && (
                         <p class="feed-description">
                           <span title={descHover}>{descDisplay}</span>
@@ -809,18 +907,39 @@ app.get("/", async (c) => {
 
                     <div class="feed-buttons">
                       <div class="feed-buttons-left">
-                        <a
-                          href={`/admin/feeds/${feed.id}/edit`}
-                          class="button button-small"
-                        >
-                          Edit
-                        </a>
-                        <a
-                          href={`/admin/feeds/${feed.id}/emails`}
-                          class="button button-small"
-                        >
-                          Emails
-                        </a>
+                        {isExpired ? (
+                          <>
+                            <span
+                              class="button button-small button-disabled"
+                              aria-disabled="true"
+                              tabindex={-1}
+                            >
+                              Edit
+                            </span>
+                            <span
+                              class="button button-small button-disabled"
+                              aria-disabled="true"
+                              tabindex={-1}
+                            >
+                              Emails
+                            </span>
+                          </>
+                        ) : (
+                          <>
+                            <a
+                              href={`/admin/feeds/${feed.id}/edit`}
+                              class="button button-small"
+                            >
+                              Edit
+                            </a>
+                            <a
+                              href={`/admin/feeds/${feed.id}/emails`}
+                              class="button button-small"
+                            >
+                              Emails
+                            </a>
+                          </>
+                        )}
                       </div>
                       <div class="feed-buttons-right">
                         <button

src/routes/admin/feeds.tsx

@@ -1,6 +1,6 @@
 import { Hono } from "hono";
 import { z } from "zod";
-import { Env, FeedConfig, FeedMetadata, EmailData } from "../../types";
+import { Env, FeedConfig, FeedMetadata } from "../../types";
 import { generateFeedId } from "../../utils/id-generator";
 import { waitUntilSafe } from "../../utils/worker";
 import { feedRssUrl, feedEmailAddress } from "../../utils/urls";
@@ -12,6 +12,7 @@ import {
   removeFeedFromList,
   removeFeedsFromListBulk,
   deleteKeysWithConcurrency,
+  purgeFeedKeysStep,
 } from "./helpers";
 
 type AppEnv = { Bindings: Env };
@@ -92,63 +93,6 @@ async function deleteFeedFast(
   return result.ok;
 }
 
-async function purgeFeedKeysStep(
-  emailStorage: KVNamespace,
-  feedId: string,
-  options: { cursor?: string; limit?: number; bucket?: R2Bucket } = {},
-): Promise<{
-  deletedKeys: string[];
-  failedKeys: string[];
-  cursor: string;
-  listComplete: boolean;
-}> {
-  const prefix = `feed:${feedId}:`;
-  const limit = Math.min(1000, Math.max(1, Math.floor(options.limit || 100)));
-  const cursor = options.cursor || undefined;
-
-  const listed = await emailStorage.list({ prefix, cursor, limit });
-  const keys = (listed.keys || []).map((k) => k.name);
-
-  if (options.bucket && keys.length > 0) {
-    const emailKeys = keys.filter((k) => {
-      const suffix = k.slice(prefix.length);
-      return suffix !== "config" && suffix !== "metadata";
-    });
-    if (emailKeys.length > 0) {
-      const emailDataResults = await Promise.allSettled(
-        emailKeys.map(
-          (k) =>
-            emailStorage.get(k, { type: "json" }) as Promise<EmailData | null>,
-        ),
-      );
-      const attachmentIds = emailDataResults
-        .filter(
-          (r): r is PromiseFulfilledResult<EmailData | null> =>
-            r.status === "fulfilled",
-        )
-        .flatMap((r) => r.value?.attachments?.map((a) => a.id) ?? []);
-      if (attachmentIds.length > 0) {
-        await Promise.allSettled(
-          attachmentIds.map((id) => options.bucket!.delete(id)),
-        );
-      }
-    }
-  }
-
-  const { ok, failed } = await deleteKeysWithConcurrency(
-    emailStorage,
-    keys,
-    35,
-  );
-
-  return {
-    deletedKeys: ok,
-    failedKeys: failed,
-    cursor: listed.cursor || "",
-    listComplete: !!listed.list_complete,
-  };
-}
-
 // ── Routes ────────────────────────────────────────────────────────────────────
 
 feedsRouter.post("/create", async (c) => {
@@ -164,6 +108,7 @@ feedsRouter.post("/create", async (c) => {
     let view: string;
     let allowedSenders: string[];
     let blockedSenders: string[];
+    let lifetimeHoursRaw: string | undefined;
 
     if (isJson) {
       const body = await c.req.json<Record<string, unknown>>();
@@ -182,6 +127,8 @@ feedsRouter.post("/create", async (c) => {
             (body.blockedSenders as unknown[]).map(String),
           )
         : [];
+      lifetimeHoursRaw =
+        body.lifetimeHours != null ? String(body.lifetimeHours) : undefined;
     } else {
       const formData = await c.req.formData();
       title = formData.get("title")?.toString() || "";
@@ -194,6 +141,7 @@ feedsRouter.post("/create", async (c) => {
       blockedSenders = parseAllowedSenders(
         formData.get("blocked_senders")?.toString() || "",
       );
+      lifetimeHoursRaw = formData.get("lifetime_hours")?.toString();
     }
 
     const parsedData = createFeedSchema.parse({
@@ -204,6 +152,17 @@ feedsRouter.post("/create", async (c) => {
       blockedSenders,
     });
 
+    // FEED_TTL_HOURS overrides any client-submitted value
+    const resolvedHours = env.FEED_TTL_HOURS
+      ? parseInt(env.FEED_TTL_HOURS, 10)
+      : lifetimeHoursRaw
+        ? parseInt(lifetimeHoursRaw, 10)
+        : NaN;
+    const expiresAt =
+      Number.isFinite(resolvedHours) && resolvedHours > 0
+        ? Date.now() + resolvedHours * 3_600_000
+        : undefined;
+
     const feedId = generateFeedId();
 
     const feedConfig: FeedConfig = {
@@ -214,6 +173,7 @@ feedsRouter.post("/create", async (c) => {
       blocked_senders: parsedData.blockedSenders,
       created_at: Date.now(),
       updated_at: Date.now(),
+      ...(expiresAt !== undefined ? { expires_at: expiresAt } : {}),
     };
 
     const feedMetadata: FeedMetadata = { emails: [] };
@@ -228,6 +188,7 @@ feedsRouter.post("/create", async (c) => {
       feedId,
       parsedData.title,
       parsedData.description,
+      expiresAt,
     );
 
     if (isJson) {
@@ -261,6 +222,22 @@ feedsRouter.get("/:feedId/edit", async (c) => {
     return c.text("Feed not found", 404);
   }
 
+  const now = Date.now();
+  const isExpired =
+    feedConfig.expires_at !== undefined && feedConfig.expires_at <= now;
+  const ttlLocked = !!env.FEED_TTL_HOURS;
+
+  // Remaining hours: ceil so we don't show 0 when there's still time left
+  const remainingHours =
+    feedConfig.expires_at !== undefined && feedConfig.expires_at > now
+      ? Math.ceil((feedConfig.expires_at - now) / 3_600_000)
+      : undefined;
+
+  const lifetimeFieldValue =
+    ttlLocked && !isExpired
+      ? (env.FEED_TTL_HOURS ?? "")
+      : (remainingHours?.toString() ?? "");
+
   return c.html(
     <Layout title="Edit Feed">
       <div class="container fade-in">
@@ -275,7 +252,25 @@ feedsRouter.get("/:feedId/edit", async (c) => {
           </div>
         </div>
 
-        <div class="card">
+        {isExpired && (
+          <div class="card card-warning">
+            <p>
+              <strong>This feed has expired.</strong> It no longer accepts
+              emails and its content is no longer publicly accessible.
+            </p>
+            <form
+              action={`/admin/feeds/${feedId}/delete`}
+              method="post"
+              style="margin-top: 0.75rem;"
+            >
+              <button type="submit" class="button button-danger">
+                Delete this feed
+              </button>
+            </form>
+          </div>
+        )}
+
+        <div class={`card${isExpired ? " card-disabled" : ""}`}>
           <form action={`/admin/feeds/${feedId}/edit`} method="post">
             <div class="form-group">
               <label for="title">Feed Title</label>
@@ -285,12 +280,18 @@ feedsRouter.get("/:feedId/edit", async (c) => {
                 name="title"
                 value={feedConfig.title}
                 required
+                disabled={isExpired}
               />
             </div>
 
             <div class="form-group">
               <label for="description">Description</label>
-              <textarea id="description" name="description" rows={3}>
+              <textarea
+                id="description"
+                name="description"
+                rows={3}
+                disabled={isExpired}
+              >
                 {feedConfig.description || ""}
               </textarea>
             </div>
@@ -304,6 +305,7 @@ feedsRouter.get("/:feedId/edit", async (c) => {
                 name="allowed_senders"
                 rows={3}
                 placeholder={"newsletter@example.com\ntechmeme.com"}
+                disabled={isExpired}
               >
                 {(feedConfig.allowed_senders || []).join("\n")}
               </textarea>
@@ -322,6 +324,7 @@ feedsRouter.get("/:feedId/edit", async (c) => {
                 name="blocked_senders"
                 rows={3}
                 placeholder={"spam@example.com\nunwanted.com"}
+                disabled={isExpired}
               >
                 {(feedConfig.blocked_senders || []).join("\n")}
               </textarea>
@@ -331,11 +334,37 @@ feedsRouter.get("/:feedId/edit", async (c) => {
               </small>
             </div>
 
+            <div class="form-group">
+              <label for="lifetime_hours">Lifetime (hours)</label>
+              <input
+                type="number"
+                id="lifetime_hours"
+                name="lifetime_hours"
+                min="1"
+                value={lifetimeFieldValue}
+                disabled={isExpired || ttlLocked}
+                placeholder={feedConfig.expires_at ? undefined : "No expiry"}
+              />
+              {ttlLocked ? (
+                <small>
+                  Feed lifetime is fixed to {env.FEED_TTL_HOURS}h by server
+                  configuration.
+                </small>
+              ) : (
+                <small>
+                  Hours from now until this feed expires. Leave empty to keep
+                  the current expiry (or no expiry).
+                </small>
+              )}
+            </div>
+
             <input type="hidden" id="language" name="language" value="en" />
 
-            <button type="submit" class="button">
-              Update Feed
-            </button>
+            {!isExpired && (
+              <button type="submit" class="button">
+                Update Feed
+              </button>
+            )}
           </form>
         </div>
       </div>
@@ -359,6 +388,7 @@ feedsRouter.post("/:feedId/edit", async (c) => {
     const blockedSenders = parseAllowedSenders(
       formData.get("blocked_senders")?.toString() || "",
     );
+    const lifetimeHoursRaw = formData.get("lifetime_hours")?.toString();
 
     const parsedData = updateFeedSchema.parse({
       title,
@@ -377,24 +407,50 @@ feedsRouter.post("/:feedId/edit", async (c) => {
       return c.text("Feed not found", 404);
     }
 
-    await emailStorage.put(
-      feedConfigKey,
-      JSON.stringify({
-        ...existingConfig,
-        title: parsedData.title,
-        description: parsedData.description,
-        language: parsedData.language,
-        allowed_senders: parsedData.allowedSenders,
-        blocked_senders: parsedData.blockedSenders,
-        updated_at: Date.now(),
-      }),
-    );
+    // Expired feeds cannot be edited
+    if (
+      existingConfig.expires_at !== undefined &&
+      existingConfig.expires_at <= Date.now()
+    ) {
+      return c.text("Feed has expired and cannot be modified.", 403);
+    }
+
+    // Resolve new expires_at:
+    // - FEED_TTL_HOURS set: always recompute from env (reset TTL from now)
+    // - Field submitted: set new expiry from now
+    // - Field empty: preserve existing expires_at (no silent removal)
+    let newExpiresAt: number | undefined;
+    if (env.FEED_TTL_HOURS) {
+      const h = parseInt(env.FEED_TTL_HOURS, 10);
+      newExpiresAt =
+        Number.isFinite(h) && h > 0 ? Date.now() + h * 3_600_000 : undefined;
+    } else if (lifetimeHoursRaw) {
+      const h = parseInt(lifetimeHoursRaw, 10);
+      newExpiresAt =
+        Number.isFinite(h) && h > 0 ? Date.now() + h * 3_600_000 : undefined;
+    } else {
+      newExpiresAt = existingConfig.expires_at;
+    }
+
+    const updatedConfig: FeedConfig = {
+      ...existingConfig,
+      title: parsedData.title,
+      description: parsedData.description,
+      language: parsedData.language,
+      allowed_senders: parsedData.allowedSenders,
+      blocked_senders: parsedData.blockedSenders,
+      updated_at: Date.now(),
+      expires_at: newExpiresAt,
+    };
+
+    await emailStorage.put(feedConfigKey, JSON.stringify(updatedConfig));
 
     await updateFeedInList(
       emailStorage,
       feedId,
       parsedData.title,
       parsedData.description,
+      newExpiresAt,
     );
 
     return c.redirect("/admin");

src/routes/admin/helpers.ts

@@ -1,4 +1,4 @@
-import { FeedList, FeedListItem } from "../../types";
+import { EmailData, FeedList, FeedListItem } from "../../types";
 import { FEEDS_LIST_KEY } from "../../config/constants";
 import { logger } from "../../lib/logger";
 
@@ -49,13 +49,14 @@ export async function addFeedToList(
   feedId: string,
   title: string,
   description?: string,
+  expires_at?: number,
 ): Promise<void> {
   try {
     const feedList = ((await emailStorage.get(FEEDS_LIST_KEY, {
       type: "json",
     })) as FeedList | null) || { feeds: [] };
 
-    feedList.feeds.push({ id: feedId, title, description });
+    feedList.feeds.push({ id: feedId, title, description, expires_at });
     await emailStorage.put(FEEDS_LIST_KEY, JSON.stringify(feedList));
   } catch (error) {
     logger.error("Error adding feed to list", { feedId, error: String(error) });
@@ -67,6 +68,7 @@ export async function updateFeedInList(
   feedId: string,
   title: string,
   description?: string,
+  expires_at?: number,
 ): Promise<void> {
   try {
     const feedList = ((await emailStorage.get(FEEDS_LIST_KEY, {
@@ -77,6 +79,7 @@ export async function updateFeedInList(
     if (feedIndex !== -1) {
       feedList.feeds[feedIndex].title = title;
       feedList.feeds[feedIndex].description = description;
+      feedList.feeds[feedIndex].expires_at = expires_at;
       await emailStorage.put(FEEDS_LIST_KEY, JSON.stringify(feedList));
     }
   } catch (error) {
@@ -128,3 +131,76 @@ export async function removeFeedFromList(
   const removed = await removeFeedsFromListBulk(emailStorage, [feedId]);
   return removed.includes(feedId);
 }
+
+export async function purgeFeedKeysStep(
+  emailStorage: KVNamespace,
+  feedId: string,
+  options: { cursor?: string; limit?: number; bucket?: R2Bucket } = {},
+): Promise<{
+  deletedKeys: string[];
+  failedKeys: string[];
+  cursor: string;
+  listComplete: boolean;
+}> {
+  const prefix = `feed:${feedId}:`;
+  const limit = Math.min(1000, Math.max(1, Math.floor(options.limit || 100)));
+  const cursor = options.cursor || undefined;
+
+  const listed = await emailStorage.list({ prefix, cursor, limit });
+  const keys = (listed.keys || []).map((k) => k.name);
+
+  if (options.bucket && keys.length > 0) {
+    const emailKeys = keys.filter((k) => {
+      const suffix = k.slice(prefix.length);
+      return suffix !== "config" && suffix !== "metadata";
+    });
+    if (emailKeys.length > 0) {
+      const emailDataResults = await Promise.allSettled(
+        emailKeys.map(
+          (k) =>
+            emailStorage.get(k, { type: "json" }) as Promise<EmailData | null>,
+        ),
+      );
+      const attachmentIds = emailDataResults
+        .filter(
+          (r): r is PromiseFulfilledResult<EmailData | null> =>
+            r.status === "fulfilled",
+        )
+        .flatMap((r) => r.value?.attachments?.map((a) => a.id) ?? []);
+      if (attachmentIds.length > 0) {
+        await Promise.allSettled(
+          attachmentIds.map((id) => options.bucket!.delete(id)),
+        );
+      }
+    }
+  }
+
+  const { ok, failed } = await deleteKeysWithConcurrency(
+    emailStorage,
+    keys,
+    35,
+  );
+
+  return {
+    deletedKeys: ok,
+    failedKeys: failed,
+    cursor: listed.cursor || "",
+    listComplete: !!listed.list_complete,
+  };
+}
+
+export async function purgeExpiredFeeds(
+  emailStorage: KVNamespace,
+  feedId: string,
+  bucket?: R2Bucket,
+): Promise<void> {
+  let cursor: string | undefined;
+  do {
+    const step = await purgeFeedKeysStep(emailStorage, feedId, {
+      bucket,
+      limit: 100,
+      cursor,
+    });
+    cursor = step.listComplete ? undefined : step.cursor;
+  } while (cursor);
+}

src/routes/atom.ts

@@ -15,6 +15,12 @@ export async function handle(c: Context<{ Bindings: Env }>): Promise<Response> {
     if (!feedData) {
       return new Response("Feed not found", { status: 404 });
     }
+    if (
+      feedData.feedConfig.expires_at !== undefined &&
+      feedData.feedConfig.expires_at <= Date.now()
+    ) {
+      return new Response("Feed has expired", { status: 410 });
+    }
 
     const base = baseUrl(c.env);
     const selfUrl = new URL(c.req.url).origin + `/atom/${feedId}`;

src/routes/entries.ts

@@ -1,6 +1,6 @@
 import { Context } from "hono";
 import { html, raw } from "hono/html";
-import { Env, FeedMetadata, EmailData } from "../types";
+import { Env, FeedConfig, FeedMetadata, EmailData } from "../types";
 import { processEmailContent } from "../utils/html-processor";
 
 export async function handle(c: Context<{ Bindings: Env }>): Promise<Response> {
@@ -13,13 +13,25 @@ export async function handle(c: Context<{ Bindings: Env }>): Promise<Response> {
 
   const emailStorage = c.env.EMAIL_STORAGE;
 
-  const feedMetadata = (await emailStorage.get(
-    `feed:${feedId}:metadata`,
-    "json",
-  )) as FeedMetadata | null;
+  const [feedMetadata, feedConfig] = await Promise.all([
+    emailStorage.get(
+      `feed:${feedId}:metadata`,
+      "json",
+    ) as Promise<FeedMetadata | null>,
+    emailStorage.get(
+      `feed:${feedId}:config`,
+      "json",
+    ) as Promise<FeedConfig | null>,
+  ]);
   if (!feedMetadata) {
     return new Response("Feed not found", { status: 404 });
   }
+  if (
+    feedConfig?.expires_at !== undefined &&
+    feedConfig.expires_at <= Date.now()
+  ) {
+    return new Response("Feed has expired", { status: 410 });
+  }
 
   const metaEntry = feedMetadata.emails.find(
     (e) => e.receivedAt === receivedAt,

src/routes/rss.ts

@@ -15,6 +15,12 @@ export async function handle(c: Context<{ Bindings: Env }>): Promise<Response> {
     if (!feedData) {
       return new Response("Feed not found", { status: 404 });
     }
+    if (
+      feedData.feedConfig.expires_at !== undefined &&
+      feedData.feedConfig.expires_at <= Date.now()
+    ) {
+      return new Response("Feed has expired", { status: 410 });
+    }
 
     const base = baseUrl(c.env);
     const selfUrl = new URL(c.req.url).origin + `/rss/${feedId}`;