usernames: operator reserved-username blocklist

A plain blocklist for names like @support - separate from the collectible
system, so a reservation has no owner, no price and no "bought on Fragment"
badge.

- reserved_usernames table + migration.
- Enforced in replacePeerUsernameTx (the single editable-username write point:
  account.updateUsername, channels.updateUsername, @BotFather /setusername) and
  in the collectible mint path; a reserved name returns USERNAME_OCCUPIED.
- admin.Service: ReserveUsername / UnreserveUsername (journalled commands) and
  the ReservedUsernames listing.
- adminapi: /v1/reserved-usernames{,/reserve,/unreserve}.
- telesrv-admin panel + a "Reserved Usernames" page in the web UI (dist rebuilt).
- Postgres and in-memory store implementations; the memory registry gains an
  optional reserved-name check so tests exercise the same rule.

cmd/telesrv-admin/server.go

@@ -12,6 +12,7 @@ import (
 	"io/fs"
 	"mime/multipart"
 	"net/http"
+	"net/url"
 	"path"
 	"strconv"
 	"strings"
@@ -100,6 +101,7 @@ func (s *server) routes() http.Handler {
 	mux.Handle("GET /api/messages/groups", s.scopedRoute(permissionMessagesRead, http.HandlerFunc(s.handleGroupMessagesAPI)))
 	mux.Handle("GET /api/messages/groups/detail", s.scopedRoute(permissionMessagesRead, http.HandlerFunc(s.handleGroupMessageDetailAPI)))
 	mux.Handle("GET /api/collectible-usernames", s.scopedRoute(permissionUsernamesRead, http.HandlerFunc(s.handleCollectibleUsernamesAPI)))
+	mux.Handle("GET /api/reserved-usernames", s.scopedRoute(permissionUsernamesRead, http.HandlerFunc(s.handleReservedUsernamesAPI)))
 	mux.Handle("GET /api/collectible-usernames/{id}", s.scopedRoute(permissionUsernamesRead, http.HandlerFunc(s.handleCollectibleUsernameDetailAPI)))
 	mux.Handle("GET /api/storage/stats", s.scopedRoute(permissionStorageRead, http.HandlerFunc(s.handleStorageStatsAPI)))
 	mux.Handle("GET /api/storage/accounts", s.scopedRoute(permissionStorageRead, http.HandlerFunc(s.handleStorageAccountsAPI)))
@@ -156,6 +158,8 @@ func (s *server) routes() http.Handler {
 	mux.Handle("POST /api/actions/delete-uncategorized-gifs", s.scopedRoute(permissionContentManage, http.HandlerFunc(s.handleDeleteUncategorizedGifsAPI)))
 	mux.Handle("POST /api/actions/storage-manual-purge", s.scopedRoute(permissionStorageManage, http.HandlerFunc(s.handleStorageManualPurgeAPI)))
 	mux.Handle("POST /api/actions/delete-gif-catalog-entry", s.scopedRoute(permissionContentManage, http.HandlerFunc(s.handleDeleteGifCatalogEntryAPI)))
+	mux.Handle("POST /api/actions/reserve-username", s.scopedRoute(permissionUsernamesManage, http.HandlerFunc(s.handleReserveUsernameAPI)))
+	mux.Handle("POST /api/actions/unreserve-username", s.scopedRoute(permissionUsernamesManage, http.HandlerFunc(s.handleUnreserveUsernameAPI)))
 	mux.Handle("POST /api/actions/mint-collectible-username", s.scopedRoute(permissionUsernamesManage, http.HandlerFunc(s.handleMintCollectibleUsernameAPI)))
 	mux.Handle("POST /api/actions/transfer-collectible-username", s.scopedRoute(permissionUsernamesManage, http.HandlerFunc(s.handleTransferCollectibleUsernameAPI)))
 	mux.Handle("POST /api/actions/revoke-collectible-username", s.scopedRoute(permissionUsernamesManage, http.HandlerFunc(s.handleRevokeCollectibleUsernameAPI)))
@@ -2438,6 +2442,69 @@ type mintCollectibleUsernameAPIRequest struct {
 	PurchaseDate   flexUnix  `json:"purchase_date"`
 }
 
+type reserveUsernameAPIRequest struct {
+	CommandID string `json:"command_id"`
+	Reason    string `json:"reason"`
+	Confirm   bool   `json:"confirm"`
+	Username  string `json:"username"`
+}
+
+func (s *server) handleReserveUsernameAPI(w http.ResponseWriter, r *http.Request) {
+	var body reserveUsernameAPIRequest
+	if !decodeAction(w, r, &body) {
+		return
+	}
+	req := admin.ReserveUsernameRequest{
+		CommandMeta: s.commandMetaFromAPI(r, body.CommandID, body.Reason, body.Confirm, "reserve-username"),
+		Username:    body.Username,
+	}
+	result, err := s.callAdminAPI(r.Context(), "/v1/reserved-usernames/reserve", req)
+	writeCommandResultAPI(w, result, err)
+}
+
+func (s *server) handleUnreserveUsernameAPI(w http.ResponseWriter, r *http.Request) {
+	var body reserveUsernameAPIRequest
+	if !decodeAction(w, r, &body) {
+		return
+	}
+	req := admin.UnreserveUsernameRequest{
+		CommandMeta: s.commandMetaFromAPI(r, body.CommandID, body.Reason, body.Confirm, "unreserve-username"),
+		Username:    body.Username,
+	}
+	result, err := s.callAdminAPI(r.Context(), "/v1/reserved-usernames/unreserve", req)
+	writeCommandResultAPI(w, result, err)
+}
+
+func (s *server) handleReservedUsernamesAPI(w http.ResponseWriter, r *http.Request) {
+	q := r.URL.Query()
+	params := url.Values{}
+	for _, name := range []string{"q", "limit", "offset"} {
+		if v := strings.TrimSpace(q.Get(name)); v != "" {
+			params.Set(name, v)
+		}
+	}
+	apiPath := "/v1/reserved-usernames"
+	if enc := params.Encode(); enc != "" {
+		apiPath += "?" + enc
+	}
+	req, err := http.NewRequestWithContext(r.Context(), http.MethodGet, s.cfg.AdminAPIURL+apiPath, nil)
+	if err != nil {
+		writeAPIError(w, http.StatusInternalServerError, "request build failed")
+		return
+	}
+	req.Header.Set("Authorization", "Bearer "+s.cfg.AdminAPIToken)
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		writeAPIError(w, http.StatusBadGateway, "admin api unreachable")
+		return
+	}
+	defer resp.Body.Close()
+	data, _ := io.ReadAll(io.LimitReader(resp.Body, 4<<20))
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(resp.StatusCode)
+	_, _ = w.Write(data)
+}
+
 func (s *server) handleMintCollectibleUsernameAPI(w http.ResponseWriter, r *http.Request) {
 	var body mintCollectibleUsernameAPIRequest
 	if !decodeAction(w, r, &body) {

cmd/telesrv-admin/web/src/api.ts

@@ -24,6 +24,7 @@ import type {
   ChannelListResponse,
   CollectibleUsernameDetail,
   CollectibleUsernameListResponse,
+  ReservedUsernameListResponse,
   CommandResult,
   DockerService,
   EnvGroup,
@@ -177,6 +178,8 @@ export const api = {
     request<CollectibleUsernameListResponse>(`/api/collectible-usernames?${params.toString()}`),
   collectibleUsername: (id: string) =>
     request<CollectibleUsernameDetail>(`/api/collectible-usernames/${encodeURIComponent(id)}`),
+  reservedUsernames: (params: URLSearchParams) =>
+    request<ReservedUsernameListResponse>(`/api/reserved-usernames?${params.toString()}`),
   dashboard: () => request<DashboardResponse>("/api/dashboard"),
   storageStats: () => request<StorageStatsResponse>("/api/storage/stats"),
   storageAccounts: (params: URLSearchParams) =>

cmd/telesrv-admin/web/src/components/Layout.tsx

@@ -1,6 +1,7 @@
 import {
   AtSign,
   BadgeCheck,
+  Ban,
   Bot,
   ChevronDown,
   Database,
@@ -288,6 +289,9 @@ export function Shell({
           {canReadUsernames && (
             <NavLink icon={<AtSign size={16} />} href="/collectible-usernames" route={route} navigate={navigate}>{"NFT Usernames"}</NavLink>
           )}
+          {canReadUsernames && (
+            <NavLink icon={<Ban size={16} />} href="/reserved-usernames" route={route} navigate={navigate}>{"Reserved Usernames"}</NavLink>
+          )}
           {canReadStorage && (
             <NavLink icon={<Database size={16} />} href="/storage" route={route} navigate={navigate}>{"Storage"}</NavLink>
           )}

cmd/telesrv-admin/web/src/pages/ReservedUsernamesPage.tsx

@@ -0,0 +1,138 @@
+import { AtSign, Loader2, Plus, RefreshCw, Search, Trash2 } from "lucide-react";
+import { useEffect, useState } from "react";
+import { api, errorMessage } from "../api";
+import { ActionButton } from "../components/ActionButton";
+import { Alert, EmptyRow, Metric, PageFrame, QueryPanel } from "../components/ui";
+import { formatUnix } from "../lib/format";
+import type { ReservedUsernameRow } from "../types";
+
+// Reserved usernames are a plain operator blocklist: a name listed here cannot be
+// taken as an editable username by any peer and cannot be minted as a
+// collectible. No owner, no price, no Fragment badge - that is the collectible
+// tab's job.
+export function ReservedUsernamesPage() {
+  const [q, setQ] = useState("");
+  const [rows, setRows] = useState<ReservedUsernameRow[]>([]);
+  const [busy, setBusy] = useState(false);
+  const [error, setError] = useState("");
+  const [newName, setNewName] = useState("");
+
+  async function load() {
+    setBusy(true);
+    setError("");
+    const params = new URLSearchParams({ limit: "200" });
+    if (q.trim()) params.set("q", q.trim().replace(/^@/, ""));
+    try {
+      const result = await api.reservedUsernames(params);
+      setRows(result.reserved ?? []);
+    } catch (err) {
+      setError(errorMessage(err));
+    } finally {
+      setBusy(false);
+    }
+  }
+
+  useEffect(() => {
+    void load();
+  }, []);
+
+  const cleanNew = newName.trim().replace(/^@/, "");
+
+  return (
+    <PageFrame
+      title={"Reserved usernames"}
+      eyebrow={"Usernames / Blocklist"}
+      actions={
+        <button className="btn icon-text" type="button" onClick={() => load()} disabled={busy}>
+          <RefreshCw size={15} className={busy ? "spin" : ""} /> {"Refresh"}
+        </button>
+      }
+    >
+      {error && <Alert>{error}</Alert>}
+      <div className="metric-row">
+        <Metric label={"Reserved names"} value={String(rows.length)} />
+      </div>
+
+      <QueryPanel>
+        <div className="toolbar">
+          <label className="field-inline">
+            <span>{"Reserve"}</span>
+            <input
+              value={newName}
+              onChange={(event) => setNewName(event.target.value)}
+              placeholder={"support"}
+            />
+          </label>
+          <ActionButton
+            disabled={cleanNew.length < 5}
+            label={"Reserve username"}
+            icon={<Plus size={15} />}
+            tone="neutral"
+            path="/api/actions/reserve-username"
+            payload={() => ({ username: cleanNew })}
+            onDone={() => {
+              setNewName("");
+              void load();
+            }}
+          />
+        </div>
+        <form
+          className="toolbar"
+          onSubmit={(event) => {
+            event.preventDefault();
+            void load();
+          }}
+        >
+          <label className="searchbox">
+            <Search size={15} />
+            <input value={q} onChange={(event) => setQ(event.target.value)} placeholder={"Filter by prefix"} />
+          </label>
+          <button className="btn primary icon-text" type="submit" disabled={busy}>
+            {busy ? <Loader2 size={15} className="spin" /> : <Search size={15} />} {"Search"}
+          </button>
+        </form>
+      </QueryPanel>
+
+      <div className="table-wrap">
+        <table className="data-table">
+          <thead>
+            <tr>
+              <th>{"Username"}</th>
+              <th>{"Reason"}</th>
+              <th>{"Reserved by"}</th>
+              <th>{"Reserved (UTC)"}</th>
+              <th></th>
+            </tr>
+          </thead>
+          <tbody>
+            {rows.map((row) => (
+              <tr key={row.username}>
+                <td>
+                  <strong>
+                    <AtSign size={13} />
+                    {row.username}
+                  </strong>
+                </td>
+                <td>{row.reason || "-"}</td>
+                <td>{row.actor || "-"}</td>
+                <td>{formatUnix(row.created_at) || "-"}</td>
+                <td>
+                  <ActionButton
+                    compact
+                    label={"Unreserve"}
+                    icon={<Trash2 size={13} />}
+                    tone="danger"
+                    path="/api/actions/unreserve-username"
+                    payload={() => ({ username: row.username })}
+                    onDone={() => void load()}
+                  />
+                </td>
+              </tr>
+            ))}
+            {rows.length === 0 && <EmptyRow colSpan={5} />}
+          </tbody>
+        </table>
+      </div>
+    </PageFrame>
+  );
+}

cmd/telesrv-admin/web/src/pages/Routes.tsx

@@ -5,6 +5,7 @@ import { AccountsPage } from "./AccountsPage";
 import { SharedDevicesPage } from "./SharedDevicesPage";
 import { CollectibleUsernameDetailPage } from "./CollectibleUsernameDetailPage";
 import { CollectibleUsernamesPage } from "./CollectibleUsernamesPage";
+import { ReservedUsernamesPage } from "./ReservedUsernamesPage";
 import { ChannelDetailPage } from "./ChannelDetailPage";
 import { ChannelsPage } from "./ChannelsPage";
 import { BotDetailPage } from "./BotDetailPage";
@@ -103,6 +104,9 @@ export function Routes({ route, navigate }: { route: RouteState; navigate: Navig
   if (route.path === "/collectible-usernames") {
     return gate(permissionUsernamesRead, <CollectibleUsernamesPage navigate={navigate} />);
   }
+  if (route.path === "/reserved-usernames") {
+    return <ReservedUsernamesPage />;
+  }
   if (route.path === "/storage") {
     return gate(permissionStorageRead, <StoragePage navigate={navigate} />);
   }

cmd/telesrv-admin/web/src/routing.ts

@@ -20,6 +20,7 @@ export function routeTitle(pathname: string): string {
   if (pathname.startsWith("/bot-verification")) return "Third-party verification";
   if (pathname.startsWith("/verification")) return "Official Verification";
   if (pathname.startsWith("/collectible-usernames")) return "Collectible Usernames";
+  if (pathname.startsWith("/reserved-usernames")) return "Reserved Usernames";
   if (pathname.startsWith("/storage")) return "Storage";
   if (pathname.startsWith("/accounts/shared-devices")) return "Shared Devices";
   if (pathname.startsWith("/accounts")) return "Accounts";

cmd/telesrv-admin/web/src/types.ts

@@ -347,6 +347,17 @@ export type CollectibleUsernameDetail = {
   transfers: CollectibleUsernameTransferRow[] | null;
 };
 
+export type ReservedUsernameRow = {
+  username: string;
+  reason: string;
+  actor: string;
+  created_at: number;
+};
+
+export type ReservedUsernameListResponse = {
+  reserved: ReservedUsernameRow[] | null;
+};
+
 // Official platform verification. Every int64 the backend tags `,string` stays a
 // decimal string here: application ids, peer ids and the optimistic-locking
 // version all outgrow the exact range of a JSON number, and a rounded version