v4: the followed feed's two views are pages — "From people" and "From playlists" on a feed's "follow" tab were a state of the page, which a reload, Back or a shared link lost, while a profile's same split is /@name/follow/playlists. They are now /follow and /follow/playlists, and /music/follow/playlists in a category, feedPath taking the view as userPath does (FOLLOW_VIEWS); picking a category keeps it. Their dumps come from GET /api/dumps?follow=users|playlists, signed in, which the feed's word for it names, instead of GET /api/me/feed?from=; an unknown category is a 404 there, as on the rest of the feed, rather than an empty list.

A feed's tab, as a profile's, a search's or the community page's, now takes the place of the current history entry, since it is a view of the same page; picking a category, another page, still adds one.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

api/routes/dumps.ts

@@ -12,6 +12,12 @@
  *   dumps the caller may see, newest first.
  * - `GET /api/dumps?category=&page=&limit=` — optional sign-in. The same, in
  *   the category with that slug; 404 when there is none.
+ * - `GET /api/dumps?follow=users&category=&page=&limit=` — signed in. The
+ *   index's "follow" tab: a page of the public dumps of the users the caller
+ *   follows, newest first, optionally in one category.
+ * - `GET /api/dumps?follow=playlists&category=&page=&limit=` — signed in. Its
+ *   `/follow/playlists` view: a page of the public dumps in the public
+ *   playlists the caller follows, most recently added first.
  * - `GET /api/dumps?url=` — optional sign-in. Answers the dumps already
  *   pointing at the same thing as `url`, for the create form's duplicate hint.
  * - `GET /api/dumps/:dumpId` — optional sign-in. Answers a dump.
@@ -50,7 +56,7 @@ import { toPublicUser } from "../model/user.ts";
 import { authMiddleware } from "../middleware/auth.ts";
 import { can } from "../lib/permissions.ts";
 import { parseOptionalAuth } from "../lib/auth.ts";
-import { parsePagination } from "../lib/pagination.ts";
+import { type Page, parsePagination } from "../lib/pagination.ts";
 import {
   createFileDump,
   createUrlDump,
@@ -61,7 +67,15 @@ import {
   refreshDumpMetadata,
   updateDump,
 } from "../services/dump-service.ts";
-import { listDumpsByCategory } from "../services/category-service.ts";
+import {
+  getCategoryBySlug,
+  listDumpsByCategory,
+} from "../services/category-service.ts";
+import {
+  getFollowedPlaylistsDumpFeed,
+  getFollowedUsersDumpFeed,
+} from "../services/follow-service.ts";
+import { FOLLOW_VIEWS, type FollowView } from "../../shared/paths.ts";
 import { getDumpVoters } from "../services/vote-service.ts";
 import { getRelatedDumps } from "../services/backlink-service.ts";
 import { getPlaylistsForDump } from "../services/playlist-service.ts";
@@ -174,9 +188,25 @@ router.get("/", async (ctx) => {
   }
   const { page, limit } = parsePagination(params);
   const category = params.get("category");
-  const { items, hasMore } = category
-    ? listDumpsByCategory(category, page, limit, requestingUserId)
-    : listDumps(page, limit, requestingUserId);
+  const follow = params.get("follow");
+  let feed: Page<Dump>;
+  if (follow !== null) {
+    if (!requestingUserId) throw new APIException(401, "Missing token");
+    if (!(FOLLOW_VIEWS as readonly string[]).includes(follow)) {
+      throw new APIException(400, "follow must be users or playlists");
+    }
+    const categoryId = category
+      ? getCategoryBySlug("dump", category).id
+      : undefined;
+    feed = (follow as FollowView) === "users"
+      ? getFollowedUsersDumpFeed(requestingUserId, page, limit, categoryId)
+      : getFollowedPlaylistsDumpFeed(requestingUserId, page, limit, categoryId);
+  } else {
+    feed = category
+      ? listDumpsByCategory(category, page, limit, requestingUserId)
+      : listDumps(page, limit, requestingUserId);
+  }
+  const { items, hasMore } = feed;
   const responseBody: APIResponse<PaginatedData<Dump>> = {
     success: true,
     data: { items, hasMore },