fix: pnginfo iTXt

2023-10-15 22:18:39 +02:00
43 changed files with 792 additions and 1306 deletions
--- a/.gitignore
+++ b/.gitignore
@ -1,3 +1,3 @@
 .env
-*.db
-*.db-*
+app*.db*
+updateConfig.ts
--- a/README.md
+++ b/README.md
@ -13,27 +13,22 @@ You can put these in `.env` file or pass them as environment variables.

 - `TG_BOT_TOKEN` - Telegram bot token. Get yours from [@BotFather](https://t.me/BotFather).
  Required.
- `DENO_KV_PATH` - [Deno KV](https://deno.land/api?s=Deno.openKv&unstable) database file path. A
-  temporary file is used by default.
+- `TG_ADMIN_USERNAMES` - Comma separated list of usernames of users that can use admin commands.
 - `LOG_LEVEL` - [Log level](https://deno.land/std@0.201.0/log/mod.ts?s=LogLevels). Default: `INFO`.

 ## Running

-1. Start Eris: `deno task start`
-2. Visit [Eris WebUI](http://localhost:5999/) and login via Telegram.
-3. Promote yourself to admin in the Eris WebUI.
-4. Start Stable Diffusion WebUI: `./webui.sh --api` (in SD WebUI directory)
-5. Add a new worker in the Eris WebUI.
+- Start stable diffusion webui: `cd sd-webui`, `./webui.sh --api`
+- Start bot: `deno task start`
+
+To connect your SD to the bot, open the [Eris UI](http://localhost:5999/), login as admin and add a
+worker.

 ## Codegen

-The Stable Diffusion API types are auto-generated. To regenerate them, first start your SD WebUI
-with `--nowebui --api`, and then run `deno task generate`
+The Stable Diffusion API in `app/sdApi.ts` is auto-generated. To regenerate it, first start your SD
+WebUI with `--nowebui --api`, and then run:

-## Project structure
-
- `/api` - Eris API served at `http://localhost:5999/api/`.
- `/app` - Queue handling and other core processes.
- `/bot` - Handling bot commands and other updates from Telegram API.
- `/ui` - Eris WebUI frontend files served at `http://localhost:5999/`.
- `/util` - Utility functions shared by other parts.
+```sh
+deno run npm:openapi-typescript http://localhost:7861/openapi.json -o app/sdApi.ts
+```
--- a/api/adminsRoute.ts
+++ b/api/adminsRoute.ts
@ -1,129 +0,0 @@
-import { Model } from "indexed_kv";
-import { info } from "std/log/mod.ts";
-import { createEndpoint, createMethodFilter, createPathFilter } from "t_rest/server";
-import { Admin, adminSchema, adminStore } from "../app/adminStore.ts";
-import { getUser, withAdmin, withUser } from "./withUser.ts";
-
-export type AdminData = Admin & { id: string };
-
-function getAdminData(adminEntry: Model<Admin>): AdminData {
-  return { id: adminEntry.id, ...adminEntry.value };
-}
-
-export const adminsRoute = createPathFilter({
-  "": createMethodFilter({
-    GET: createEndpoint(
-      {},
-      async () => {
-        const adminEntries = await adminStore.getAll();
-        const admins = adminEntries.map(getAdminData);
-        return {
-          status: 200,
-          body: { type: "application/json", data: admins satisfies AdminData[] },
-        };
-      },
-    ),
-    POST: createEndpoint(
-      {
-        query: {
-          sessionId: { type: "string" },
-        },
-        body: {
-          type: "application/json",
-          schema: {
-            type: "object",
-            properties: {
-              tgUserId: adminSchema.properties.tgUserId,
-            },
-            required: ["tgUserId"],
-          },
-        },
-      },
-      async ({ query, body }) => {
-        return withAdmin(query, async (user, adminEntry) => {
-          const newAdminUser = await getUser(body.data.tgUserId);
-          const newAdminEntry = await adminStore.create({
-            tgUserId: body.data.tgUserId,
-            promotedBy: adminEntry.id,
-          });
-          info(`User ${user.first_name} promoted user ${newAdminUser.first_name} to admin`);
-          return {
-            status: 200,
-            body: { type: "application/json", data: getAdminData(newAdminEntry) },
-          };
-        });
-      },
-    ),
-  }),
-
-  "promote_self": createMethodFilter({
-    POST: createEndpoint(
-      {
-        query: {
-          sessionId: { type: "string" },
-        },
-      },
-      // if there are no admins, allow any user to promote themselves
-      async ({ query }) => {
-        return withUser(query, async (user) => {
-          const adminEntries = await adminStore.getAll();
-          if (adminEntries.length === 0) {
-            const newAdminEntry = await adminStore.create({
-              tgUserId: user.id,
-              promotedBy: null,
-            });
-            info(`User ${user.first_name} promoted themselves to admin`);
-            return {
-              status: 200,
-              body: { type: "application/json", data: getAdminData(newAdminEntry) },
-            };
-          }
-          return {
-            status: 403,
-            body: { type: "text/plain", data: `You are not allowed to promote yourself` },
-          };
-        });
-      },
-    ),
-  }),
-
-  "{adminId}": createPathFilter({
-    "": createMethodFilter({
-      GET: createEndpoint(
-        {},
-        async ({ params }) => {
-          const adminEntry = await adminStore.getById(params.adminId!);
-          if (!adminEntry) {
-            return { status: 404, body: { type: "text/plain", data: `Admin not found` } };
-          }
-          return {
-            status: 200,
-            body: { type: "application/json", data: getAdminData(adminEntry) },
-          };
-        },
-      ),
-      DELETE: createEndpoint(
-        {
-          query: {
-            sessionId: { type: "string" },
-          },
-        },
-        async ({ params, query }) => {
-          const deletedAdminEntry = await adminStore.getById(params.adminId!);
-          if (!deletedAdminEntry) {
-            return { status: 404, body: { type: "text/plain", data: `Admin not found` } };
-          }
-          const deletedAdminUser = await getUser(deletedAdminEntry.value.tgUserId);
-          return withUser(query, async (chat) => {
-            await deletedAdminEntry.delete();
-            info(`User ${chat.first_name} demoted user ${deletedAdminUser.first_name} from admin`);
-            return {
-              status: 200,
-              body: { type: "application/json", data: null },
-            };
-          });
-        },
-      ),
-    }),
-  }),
-});
--- a/api/botRoute.ts
+++ b/api/botRoute.ts
@ -1,9 +0,0 @@
-import { createEndpoint, createMethodFilter } from "t_rest/server";
-import { bot } from "../bot/mod.ts";
-
-export const botRoute = createMethodFilter({
-  GET: createEndpoint({ query: null, body: null }, async () => {
-    const username = bot.botInfo.username;
-    return { status: 200, body: { type: "application/json", data: { username } } };
-  }),
-});
--- a/api/mod.ts
+++ b/api/mod.ts
@ -1,7 +1,7 @@
 import { route } from "reroute";
 import { serveSpa } from "serve_spa";
 import { serveApi } from "./serveApi.ts";
-import { fromFileUrl } from "std/path/mod.ts";
+import { fromFileUrl } from "std/path/mod.ts"

 export async function serveUi() {
  const server = Deno.serve({ port: 5999 }, (request) =>
--- a/api/paramsRoute.ts
+++ b/api/paramsRoute.ts
@ -2,7 +2,8 @@ import { deepMerge } from "std/collections/deep_merge.ts";
 import { info } from "std/log/mod.ts";
 import { createEndpoint, createMethodFilter } from "t_rest/server";
 import { configSchema, getConfig, setConfig } from "../app/config.ts";
-import { withAdmin } from "./withUser.ts";
+import { bot } from "../bot/mod.ts";
+import { sessions } from "./sessionsRoute.ts";

 export const paramsRoute = createMethodFilter({
  GET: createEndpoint(
@ -22,13 +23,23 @@ export const paramsRoute = createMethodFilter({
      },
    },
    async ({ query, body }) => {
-      return withAdmin(query, async (user) => {
+      const session = sessions.get(query.sessionId);
+      if (!session?.userId) {
+        return { status: 401, body: { type: "text/plain", data: "Must be logged in" } };
+      }
+      const chat = await bot.api.getChat(session.userId);
+      if (chat.type !== "private") throw new Error("Chat is not private");
+      if (!chat.username) {
+        return { status: 403, body: { type: "text/plain", data: "Must have a username" } };
+      }
      const config = await getConfig();
-        info(`User ${user.first_name} updated default params: ${JSON.stringify(body.data)}`);
+      if (!config?.adminUsernames?.includes(chat.username)) {
+        return { status: 403, body: { type: "text/plain", data: "Must be an admin" } };
+      }
+      info(`User ${chat.username} updated default params: ${JSON.stringify(body.data)}`);
      const defaultParams = deepMerge(config.defaultParams ?? {}, body.data);
      await setConfig({ defaultParams });
      return { status: 200, body: { type: "application/json", data: config.defaultParams } };
-      });
    },
  ),
 });
--- a/api/serveApi.ts
+++ b/api/serveApi.ts
@ -1,23 +1,32 @@
-import { createLoggerMiddleware, createPathFilter } from "t_rest/server";
-import { adminsRoute } from "./adminsRoute.ts";
-import { botRoute } from "./botRoute.ts";
+import {
+  createEndpoint,
+  createLoggerMiddleware,
+  createMethodFilter,
+  createPathFilter,
+} from "t_rest/server";
 import { jobsRoute } from "./jobsRoute.ts";
 import { paramsRoute } from "./paramsRoute.ts";
 import { sessionsRoute } from "./sessionsRoute.ts";
 import { statsRoute } from "./statsRoute.ts";
 import { usersRoute } from "./usersRoute.ts";
 import { workersRoute } from "./workersRoute.ts";
+import { bot } from "../bot/mod.ts";

 export const serveApi = createLoggerMiddleware(
  createPathFilter({
-    "admins": adminsRoute,
-    "bot": botRoute,
    "jobs": jobsRoute,
    "sessions": sessionsRoute,
+    "users": usersRoute,
    "settings/params": paramsRoute,
    "stats": statsRoute,
-    "users": usersRoute,
    "workers": workersRoute,
+    "bot": createMethodFilter({
+      // deno-lint-ignore require-await
+      GET: createEndpoint({ query: null, body: null }, async () => {
+        const username = bot.botInfo.username;
+        return { status: 200, body: { type: "application/json", data: { username } } };
+      }),
+    }),
  }),
  { filterStatus: (status) => status >= 400 },
 );
--- a/api/sessionsRoute.ts
+++ b/api/sessionsRoute.ts
@ -1,10 +1,11 @@
+// deno-lint-ignore-file require-await
 import { createEndpoint, createMethodFilter, createPathFilter } from "t_rest/server";
 import { ulid } from "ulid";

 export const sessions = new Map<string, Session>();

 export interface Session {
-  userId?: number | undefined;
+  userId?: number;
 }

 export const sessionsRoute = createPathFilter({
@ -24,7 +25,7 @@ export const sessionsRoute = createPathFilter({
    GET: createEndpoint(
      { query: null, body: null },
      async ({ params }) => {
-        const id = params.sessionId!;
+        const id = params.sessionId;
        const session = sessions.get(id);
        if (!session) {
          return { status: 401, body: { type: "text/plain", data: "Session not found" } };
--- a/api/statsRoute.ts
+++ b/api/statsRoute.ts
@ -1,10 +1,10 @@
-import { subMinutes } from "date-fns";
 import { createEndpoint, createMethodFilter, createPathFilter } from "t_rest/server";
-import { getDailyStats } from "../app/dailyStatsStore.ts";
-import { generationStore } from "../app/generationStore.ts";
 import { globalStats } from "../app/globalStats.ts";
-import { getUserDailyStats } from "../app/userDailyStatsStore.ts";
+import { getDailyStats } from "../app/dailyStatsStore.ts";
 import { getUserStats } from "../app/userStatsStore.ts";
+import { getUserDailyStats } from "../app/userDailyStatsStore.ts";
+import { generationStore } from "../app/generationStore.ts";
+import { subMinutes } from "date-fns";

 const STATS_INTERVAL_MIN = 3;

--- a/api/usersRoute.ts
+++ b/api/usersRoute.ts
@ -1,18 +1,20 @@
 import { createEndpoint, createMethodFilter, createPathFilter } from "t_rest/server";
+import { getConfig } from "../app/config.ts";
 import { bot } from "../bot/mod.ts";
-import { getUser } from "./withUser.ts";
-import { adminStore } from "../app/adminStore.ts";

 export const usersRoute = createPathFilter({
  "{userId}/photo": createMethodFilter({
    GET: createEndpoint(
      { query: null, body: null },
      async ({ params }) => {
-        const user = await getUser(Number(params.userId!));
-        const photoData = user.photo?.small_file_id
+        const chat = await bot.api.getChat(params.userId);
+        if (chat.type !== "private") {
+          throw new Error("Chat is not private");
+        }
+        const photoData = chat.photo?.small_file_id
          ? await fetch(
            `https://api.telegram.org/file/bot${bot.token}/${await bot.api.getFile(
-              user.photo.small_file_id,
+              chat.photo.small_file_id,
            ).then((file) => file.file_path)}`,
          ).then((resp) => resp.arrayBuffer())
          : undefined;
@ -34,14 +36,17 @@ export const usersRoute = createPathFilter({
    GET: createEndpoint(
      { query: null, body: null },
      async ({ params }) => {
-        const user = await getUser(Number(params.userId!));
-        const [adminEntry] = await adminStore.getBy("tgUserId", { value: user.id });
-        const admin = adminEntry?.value;
+        const chat = await bot.api.getChat(params.userId);
+        if (chat.type !== "private") {
+          throw new Error("Chat is not private");
+        }
+        const config = await getConfig();
+        const isAdmin = chat.username && config?.adminUsernames?.includes(chat.username);
        return {
          status: 200,
          body: {
            type: "application/json",
-            data: { ...user, admin },
+            data: { ...chat, isAdmin },
          },
        };
      },
--- a/api/withUser.ts
+++ b/api/withUser.ts
@ -1,40 +0,0 @@
-import { Chat } from "grammy_types";
-import { Model } from "indexed_kv";
-import { Output } from "t_rest/client";
-import { Admin, adminStore } from "../app/adminStore.ts";
-import { bot } from "../bot/mod.ts";
-import { sessions } from "./sessionsRoute.ts";
-
-export async function withUser<O extends Output>(
-  query: { sessionId: string },
-  cb: (user: Chat.PrivateGetChat) => Promise<O>,
-) {
-  const session = sessions.get(query.sessionId);
-  if (!session?.userId) {
-    return { status: 401, body: { type: "text/plain", data: "Must be logged in" } } as const;
-  }
-  const user = await getUser(session.userId);
-  return cb(user);
-}
-
-export async function withAdmin<O extends Output>(
-  query: { sessionId: string },
-  cb: (user: Chat.PrivateGetChat, admin: Model<Admin>) => Promise<O>,
-) {
-  const session = sessions.get(query.sessionId);
-  if (!session?.userId) {
-    return { status: 401, body: { type: "text/plain", data: "Must be logged in" } } as const;
-  }
-  const user = await getUser(session.userId);
-  const [admin] = await adminStore.getBy("tgUserId", { value: session.userId });
-  if (!admin) {
-    return { status: 403, body: { type: "text/plain", data: "Must be an admin" } } as const;
-  }
-  return cb(user, admin);
-}
-
-export async function getUser(userId: number): Promise<Chat.PrivateGetChat> {
-  const chat = await bot.api.getChat(userId);
-  if (chat.type !== "private") throw new Error("Chat is not private");
-  return chat;
-}
--- a/api/workersRoute.ts
+++ b/api/workersRoute.ts
@ -3,17 +3,14 @@ import { Model } from "indexed_kv";
 import createOpenApiFetch from "openapi_fetch";
 import { info } from "std/log/mod.ts";
 import { createEndpoint, createMethodFilter, createPathFilter } from "t_rest/server";
+import { getConfig } from "../app/config.ts";
 import { activeGenerationWorkers } from "../app/generationQueue.ts";
 import { generationStore } from "../app/generationStore.ts";
 import * as SdApi from "../app/sdApi.ts";
-import {
-  WorkerInstance,
-  workerInstanceSchema,
-  workerInstanceStore,
-} from "../app/workerInstanceStore.ts";
+import { WorkerInstance, workerInstanceStore } from "../app/workerInstanceStore.ts";
+import { bot } from "../bot/mod.ts";
 import { getAuthHeader } from "../utils/getAuthHeader.ts";
-import { omitUndef } from "../utils/omitUndef.ts";
-import { withAdmin } from "./withUser.ts";
+import { sessions } from "./sessionsRoute.ts";

 export type WorkerData = Omit<WorkerInstance, "sdUrl" | "sdAuth"> & {
  id: string;
@ -72,6 +69,7 @@ export const workersRoute = createPathFilter({
      async () => {
        const workerInstances = await workerInstanceStore.getAll();
        const workers = await Promise.all(workerInstances.map(getWorkerData));
+
        return {
          status: 200,
          body: { type: "application/json", data: workers satisfies WorkerData[] },
@ -85,18 +83,51 @@ export const workersRoute = createPathFilter({
        },
        body: {
          type: "application/json",
-          schema: workerInstanceSchema,
+          schema: {
+            type: "object",
+            properties: {
+              key: { type: "string" },
+              name: { type: ["string", "null"] },
+              sdUrl: { type: "string" },
+              sdAuth: {
+                type: ["object", "null"],
+                properties: {
+                  user: { type: "string" },
+                  password: { type: "string" },
+                },
+                required: ["user", "password"],
+              },
+            },
+            required: ["key", "name", "sdUrl", "sdAuth"],
+          },
        },
      },
      async ({ query, body }) => {
-        return withAdmin(query, async (user) => {
-          const workerInstance = await workerInstanceStore.create(body.data);
-          info(`User ${user.first_name} created worker ${workerInstance.value.name}`);
+        const session = sessions.get(query.sessionId);
+        if (!session?.userId) {
+          return { status: 401, body: { type: "text/plain", data: "Must be logged in" } };
+        }
+        const chat = await bot.api.getChat(session.userId);
+        if (chat.type !== "private") throw new Error("Chat is not private");
+        if (!chat.username) {
+          return { status: 403, body: { type: "text/plain", data: "Must have a username" } };
+        }
+        const config = await getConfig();
+        if (!config?.adminUsernames?.includes(chat.username)) {
+          return { status: 403, body: { type: "text/plain", data: "Must be an admin" } };
+        }
+        const workerInstance = await workerInstanceStore.create({
+          key: body.data.key,
+          name: body.data.name,
+          sdUrl: body.data.sdUrl,
+          sdAuth: body.data.sdAuth,
+        });
+        info(`User ${chat.username} created worker ${workerInstance.id}`);
+        const worker = await getWorkerData(workerInstance);
        return {
          status: 200,
-            body: { type: "application/json", data: await getWorkerData(workerInstance) },
+          body: { type: "application/json", data: worker satisfies WorkerData },
        };
-        });
      },
    ),
  }),
@ -106,13 +137,14 @@ export const workersRoute = createPathFilter({
      GET: createEndpoint(
        { query: null, body: null },
        async ({ params }) => {
-          const workerInstance = await workerInstanceStore.getById(params.workerId!);
+          const workerInstance = await workerInstanceStore.getById(params.workerId);
          if (!workerInstance) {
            return { status: 404, body: { type: "text/plain", data: `Worker not found` } };
          }
+          const worker: WorkerData = await getWorkerData(workerInstance);
          return {
            status: 200,
-            body: { type: "application/json", data: await getWorkerData(workerInstance) },
+            body: { type: "application/json", data: worker satisfies WorkerData },
          };
        },
      ),
@ -123,26 +155,60 @@ export const workersRoute = createPathFilter({
          },
          body: {
            type: "application/json",
-            schema: { ...workerInstanceSchema, required: [] },
+            schema: {
+              type: "object",
+              properties: {
+                key: { type: "string" },
+                name: { type: ["string", "null"] },
+                sdUrl: { type: "string" },
+                auth: {
+                  type: ["object", "null"],
+                  properties: {
+                    user: { type: "string" },
+                    password: { type: "string" },
+                  },
+                  required: ["user", "password"],
+                },
+              },
+            },
          },
        },
        async ({ params, query, body }) => {
-          const workerInstance = await workerInstanceStore.getById(params.workerId!);
+          const workerInstance = await workerInstanceStore.getById(params.workerId);
          if (!workerInstance) {
            return { status: 404, body: { type: "text/plain", data: `Worker not found` } };
          }
-          return withAdmin(query, async (user) => {
+          const session = sessions.get(query.sessionId);
+          if (!session?.userId) {
+            return { status: 401, body: { type: "text/plain", data: "Must be logged in" } };
+          }
+          const chat = await bot.api.getChat(session.userId);
+          if (chat.type !== "private") throw new Error("Chat is not private");
+          if (!chat.username) {
+            return { status: 403, body: { type: "text/plain", data: "Must have a username" } };
+          }
+          const config = await getConfig();
+          if (!config?.adminUsernames?.includes(chat.username)) {
+            return { status: 403, body: { type: "text/plain", data: "Must be an admin" } };
+          }
+          if (body.data.name !== undefined) {
+            workerInstance.value.name = body.data.name;
+          }
+          if (body.data.sdUrl !== undefined) {
+            workerInstance.value.sdUrl = body.data.sdUrl;
+          }
+          if (body.data.auth !== undefined) {
+            workerInstance.value.sdAuth = body.data.auth;
+          }
          info(
-              `User ${user.first_name} updated worker ${workerInstance.value.name}: ${
-                JSON.stringify(body.data)
-              }`,
+            `User ${chat.username} updated worker ${params.workerId}: ${JSON.stringify(body.data)}`,
          );
-            await workerInstance.update(omitUndef(body.data));
+          await workerInstance.update();
+          const worker = await getWorkerData(workerInstance);
          return {
            status: 200,
-              body: { type: "application/json", data: await getWorkerData(workerInstance) },
+            body: { type: "application/json", data: worker satisfies WorkerData },
          };
-          });
        },
      ),
      DELETE: createEndpoint(
@ -153,15 +219,26 @@ export const workersRoute = createPathFilter({
          body: null,
        },
        async ({ params, query }) => {
-          const workerInstance = await workerInstanceStore.getById(params.workerId!);
+          const workerInstance = await workerInstanceStore.getById(params.workerId);
          if (!workerInstance) {
            return { status: 404, body: { type: "text/plain", data: `Worker not found` } };
          }
-          return withAdmin(query, async (user) => {
-            info(`User ${user.first_name} deleted worker ${workerInstance.value.name}`);
+          const session = sessions.get(query.sessionId);
+          if (!session?.userId) {
+            return { status: 401, body: { type: "text/plain", data: "Must be logged in" } };
+          }
+          const chat = await bot.api.getChat(session.userId);
+          if (chat.type !== "private") throw new Error("Chat is not private");
+          if (!chat.username) {
+            return { status: 403, body: { type: "text/plain", data: "Must have a username" } };
+          }
+          const config = await getConfig();
+          if (!config?.adminUsernames?.includes(chat.username)) {
+            return { status: 403, body: { type: "text/plain", data: "Must be an admin" } };
+          }
+          info(`User ${chat.username} deleted worker ${params.workerId}`);
          await workerInstance.delete();
          return { status: 200, body: { type: "application/json", data: null } };
-          });
        },
      ),
    }),
@ -170,7 +247,7 @@ export const workersRoute = createPathFilter({
      GET: createEndpoint(
        { query: null, body: null },
        async ({ params }) => {
-          const workerInstance = await workerInstanceStore.getById(params.workerId!);
+          const workerInstance = await workerInstanceStore.getById(params.workerId);
          if (!workerInstance) {
            return { status: 404, body: { type: "text/plain", data: `Worker not found` } };
          }
@ -201,7 +278,7 @@ export const workersRoute = createPathFilter({
      GET: createEndpoint(
        { query: null, body: null },
        async ({ params }) => {
-          const workerInstance = await workerInstanceStore.getById(params.workerId!);
+          const workerInstance = await workerInstanceStore.getById(params.workerId);
          if (!workerInstance) {
            return { status: 404, body: { type: "text/plain", data: `Worker not found` } };
          }
--- a/app/adminStore.ts
+++ b/app/adminStore.ts
@ -1,24 +0,0 @@
-import { Store } from "indexed_kv";
-import { JsonSchema, jsonType } from "t_rest/server";
-import { db } from "./db.ts";
-
-export const adminSchema = {
-  type: "object",
-  properties: {
-    tgUserId: { type: "number" },
-    promotedBy: { type: ["string", "null"] },
-  },
-  required: ["tgUserId", "promotedBy"],
-} as const satisfies JsonSchema;
-
-export type Admin = jsonType<typeof adminSchema>;
-
-type AdminIndices = {
-  tgUserId: number;
-};
-
-export const adminStore = new Store<Admin, AdminIndices>(db, "adminUsers", {
-  indices: {
-    tgUserId: { getValue: (adminUser) => adminUser.tgUserId },
-  },
-});
--- a/app/config.ts
+++ b/app/config.ts
@ -4,6 +4,7 @@ import { JsonSchema, jsonType } from "t_rest/server";
 export const configSchema = {
  type: "object",
  properties: {
+    adminUsernames: { type: "array", items: { type: "string" } },
    pausedReason: { type: ["string", "null"] },
    maxUserJobs: { type: "number" },
    maxJobs: { type: "number" },
@ -30,6 +31,7 @@ export async function getConfig(): Promise<Config> {
  const configEntry = await db.get<Config>(["config"]);
  const config = configEntry?.value;
  return {
+    adminUsernames: config?.adminUsernames ?? Deno.env.get("TG_ADMIN_USERNAMES")?.split(",") ?? [],
    pausedReason: config?.pausedReason ?? null,
    maxUserJobs: config?.maxUserJobs ?? Infinity,
    maxJobs: config?.maxJobs ?? Infinity,
@ -40,6 +42,7 @@ export async function getConfig(): Promise<Config> {
 export async function setConfig(newConfig: Partial<Config>): Promise<void> {
  const oldConfig = await getConfig();
  const config: Config = {
+    adminUsernames: newConfig.adminUsernames ?? oldConfig.adminUsernames,
    pausedReason: newConfig.pausedReason ?? oldConfig.pausedReason,
    maxUserJobs: newConfig.maxUserJobs ?? oldConfig.maxUserJobs,
    maxJobs: newConfig.maxJobs ?? oldConfig.maxJobs,
--- a/app/dailyStatsStore.ts
+++ b/app/dailyStatsStore.ts
@ -1,5 +1,5 @@
+import { UTCDateMini } from "@date-fns/utc";
 import { hoursToMilliseconds, isSameDay, minutesToMilliseconds } from "date-fns";
-import { UTCDateMini } from "date-fns/utc";
 import { info } from "std/log/mod.ts";
 import { JsonSchema, jsonType } from "t_rest/server";
 import { db } from "./db.ts";
--- a/app/db.ts
+++ b/app/db.ts
@ -1,4 +1,4 @@
 import { KvFs } from "kvfs";

-export const db = await Deno.openKv(Deno.env.get("DENO_KV_PATH"));
+export const db = await Deno.openKv("./app.db");
 export const fs = new KvFs(db);
--- a/app/generationQueue.ts
+++ b/app/generationQueue.ts
@ -11,7 +11,6 @@ import { PngInfo } from "../bot/parsePngInfo.ts";
 import { formatOrdinal } from "../utils/formatOrdinal.ts";
 import { formatUserChat } from "../utils/formatUserChat.ts";
 import { getAuthHeader } from "../utils/getAuthHeader.ts";
-import { omitUndef } from "../utils/omitUndef.ts";
 import { SdError } from "./SdError.ts";
 import { getConfig } from "./config.ts";
 import { db, fs } from "./db.ts";
@ -162,7 +161,7 @@ async function processGenerationJob(

  // reduce size if worker can't handle the resolution
  const size = limitSize(
-    omitUndef({ ...config.defaultParams, ...state.task.params }),
+    { ...config.defaultParams, ...state.task.params },
    1024 * 1024,
  );
  function limitSize(
@ -183,18 +182,18 @@ async function processGenerationJob(
  // start generating the image
  const responsePromise = state.task.type === "txt2img"
    ? workerSdClient.POST("/sdapi/v1/txt2img", {
-      body: omitUndef({
+      body: {
        ...config.defaultParams,
        ...state.task.params,
        ...size,
        negative_prompt: state.task.params.negative_prompt
          ? state.task.params.negative_prompt
          : config.defaultParams?.negative_prompt,
-      }),
+      },
    })
    : state.task.type === "img2img"
    ? workerSdClient.POST("/sdapi/v1/img2img", {
-      body: omitUndef({
+      body: {
        ...config.defaultParams,
        ...state.task.params,
        ...size,
@ -210,7 +209,7 @@ async function processGenerationJob(
            ).then((resp) => resp.arrayBuffer()),
          ),
        ],
-      }),
+      },
    })
    : undefined;

@ -306,24 +305,24 @@ async function processGenerationJob(
 export async function updateGenerationQueue() {
  while (true) {
    const jobs = await generationQueue.getAllJobs();
-
-    await Promise.all(jobs.map(async (job) => {
-      if (job.status === "processing") {
-        // if the job is processing, the worker will update its status message
-        return;
+    let index = 0;
+    for (const job of jobs) {
+      if (job.lockUntil > new Date()) {
+        // job is currently being processed, the worker will update its status message
+        continue;
      }
-
-      // spread the updates in time randomly
-      await delay(Math.random() * 3_000);
-
+      if (!job.state.replyMessage) {
+        // no status message, nothing to update
+        continue;
+      }
+      index++;
      await bot.api.editMessageText(
        job.state.replyMessage.chat.id,
        job.state.replyMessage.message_id,
-        `You are ${formatOrdinal(job.place)} in queue.`,
+        `You are ${formatOrdinal(index)} in queue.`,
        { maxAttempts: 1 },
      ).catch(() => undefined);
-    }));
-
-    await delay(10_000);
+    }
+    await delay(3000);
  }
 }
--- a/app/generationStore.ts
+++ b/app/generationStore.ts
@ -5,10 +5,10 @@ import { db } from "./db.ts";
 export interface GenerationSchema {
  from: User;
  chat: Chat;
-  sdInstanceId?: string | undefined; // TODO: change to workerInstanceKey
-  info?: SdGenerationInfo | undefined;
-  startDate?: Date | undefined;
-  endDate?: Date | undefined;
+  sdInstanceId?: string; // TODO: change to workerInstanceKey
+  info?: SdGenerationInfo;
+  startDate?: Date;
+  endDate?: Date;
 }

 /**
--- a/app/kvMemoize.ts
+++ b/app/kvMemoize.ts
@ -1,42 +1,19 @@
-export interface KvMemoizeOptions<A extends Deno.KvKey, R> {
 /**
-   * The time in milliseconds until the cached result expires.
-   */
-  expireIn?: ((result: R, ...args: A) => number) | number | undefined;
-  /**
-   * Whether to recalculate the result if it was already cached.
-   *
-   * Runs whenever the result is retrieved from the cache.
-   */
-  shouldRecalculate?: ((result: R, ...args: A) => boolean) | undefined;
-  /**
-   * Whether to cache the result after computing it.
-   *
-   * Runs whenever a new result is computed.
-   */
-  shouldCache?: ((result: R, ...args: A) => boolean) | undefined;
-  /**
-   * Override the default KV store functions.
-   */
-  override?: {
-    set: (
-      key: Deno.KvKey,
-      args: A,
-      value: R,
-      options: { expireIn?: number },
-    ) => Promise<void>;
-    get: (key: Deno.KvKey, args: A) => Promise<R | undefined>;
-  };
-}
-
-/**
- * Memoizes the function result in KV store.
+ * Memoizes the function result in KV storage.
 */
 export function kvMemoize<A extends Deno.KvKey, R>(
  db: Deno.Kv,
  key: Deno.KvKey,
  fn: (...args: A) => Promise<R>,
-  options?: KvMemoizeOptions<A, R>,
+  options?: {
+    expireIn?: number | ((result: R, ...args: A) => number);
+    shouldRecalculate?: (result: R, ...args: A) => boolean;
+    shouldCache?: (result: R, ...args: A) => boolean;
+    override?: {
+      set: (key: Deno.KvKey, args: A, value: R, options: { expireIn?: number }) => Promise<void>;
+      get: (key: Deno.KvKey, args: A) => Promise<R | undefined>;
+    };
+  },
 ): (...args: A) => Promise<R> {
  return async (...args) => {
    const cachedResult = options?.override?.get
@ -57,9 +34,9 @@ export function kvMemoize<A extends Deno.KvKey, R>(

    if (options?.shouldCache?.(result, ...args) ?? (result != null)) {
      if (options?.override?.set) {
-        await options.override.set(key, args, result, expireIn != null ? { expireIn } : {});
+        await options.override.set(key, args, result, { expireIn });
      } else {
-        await db.set([...key, ...args], result, expireIn != null ? { expireIn } : {});
+        await db.set([...key, ...args], result, { expireIn });
      }
    }

--- a/app/uploadQueue.ts
+++ b/app/uploadQueue.ts
@ -92,7 +92,7 @@ export async function processUploadQueue() {
    // send caption in separate message if it couldn't fit
    if (caption.text.length > 1024 && caption.text.length <= 4096) {
      await bot.api.sendMessage(state.chat.id, caption.text, {
-        reply_to_message_id: resultMessages[0]!.message_id,
+        reply_to_message_id: resultMessages[0].message_id,
        allow_sending_without_reply: true,
        entities: caption.entities,
        maxWait: 60,
@ -132,7 +132,7 @@ export async function processUploadQueue() {
    // delete the status message
    await bot.api.deleteMessage(state.replyMessage.chat.id, state.replyMessage.message_id)
      .catch(() => undefined);
-  }, { concurrency: 10 });
+  }, { concurrency: 3 });

  uploadWorker.addEventListener("error", (e) => {
    error(`Upload failed for ${formatUserChat(e.detail.job.state)}: ${e.detail.error}`);
--- a/bot/broadcastCommand.ts
+++ b/bot/broadcastCommand.ts
@ -2,7 +2,7 @@ import { CommandContext } from "grammy";
 import { bold, fmt, FormattedString } from "grammy_parse_mode";
 import { distinctBy } from "std/collections/distinct_by.ts";
 import { error, info } from "std/log/mod.ts";
-import { adminStore } from "../app/adminStore.ts";
+import { getConfig } from "../app/config.ts";
 import { generationStore } from "../app/generationStore.ts";
 import { formatUserChat } from "../utils/formatUserChat.ts";
 import { ErisContext } from "./mod.ts";
@ -12,9 +12,9 @@ export async function broadcastCommand(ctx: CommandContext<ErisContext>) {
    return ctx.reply("I don't know who you are.");
  }

-  const [admin] = await adminStore.getBy("tgUserId", { value: ctx.from.id });
+  const config = await getConfig();

-  if (!admin) {
+  if (!config.adminUsernames.includes(ctx.from.username)) {
    return ctx.reply("Only a bot admin can use this command.");
  }

--- a/bot/cancelCommand.ts
+++ b/bot/cancelCommand.ts
@ -1,5 +1,4 @@
 import { generationQueue } from "../app/generationQueue.ts";
-import { omitUndef } from "../utils/omitUndef.ts";
 import { ErisContext } from "./mod.ts";

 export async function cancelCommand(ctx: ErisContext) {
@ -8,11 +7,8 @@ export async function cancelCommand(ctx: ErisContext) {
    .filter((job) => job.lockUntil < new Date())
    .filter((j) => j.state.from.id === ctx.from?.id);
  for (const job of userJobs) await generationQueue.deleteJob(job.id);
-  await ctx.reply(
-    `Cancelled ${userJobs.length} jobs`,
-    omitUndef({
+  await ctx.reply(`Cancelled ${userJobs.length} jobs`, {
    reply_to_message_id: ctx.message?.message_id,
    allow_sending_without_reply: true,
-    }),
-  );
+  });
 }
--- a/bot/mod.ts
+++ b/bot/mod.ts
@ -4,8 +4,8 @@ import { hydrateReply, ParseModeFlavor } from "grammy_parse_mode";
 import { run, sequentialize } from "grammy_runner";
 import { error, info, warning } from "std/log/mod.ts";
 import { sessions } from "../api/sessionsRoute.ts";
+import { getConfig, setConfig } from "../app/config.ts";
 import { formatUserChat } from "../utils/formatUserChat.ts";
-import { omitUndef } from "../utils/omitUndef.ts";
 import { broadcastCommand } from "./broadcastCommand.ts";
 import { cancelCommand } from "./cancelCommand.ts";
 import { img2imgCommand, img2imgQuestion } from "./img2imgCommand.ts";
@ -19,11 +19,11 @@ interface SessionData {
 }

 interface ErisChatData {
-  language?: string | undefined;
+  language?: string;
 }

 interface ErisUserData {
-  params?: Record<string, string> | undefined;
+  params?: Record<string, string>;
 }

 export type ErisContext =
@ -94,13 +94,10 @@ bot.use(async (ctx, next) => {
    await next();
  } catch (err) {
    try {
-      await ctx.reply(
-        `Handling update failed: ${err}`,
-        omitUndef({
+      await ctx.reply(`Handling update failed: ${err}`, {
        reply_to_message_id: ctx.message?.message_id,
        allow_sending_without_reply: true,
-        }),
-      );
+      });
    } catch {
      throw err;
    }
@ -125,33 +122,24 @@ bot.command("start", async (ctx) => {
    const id = ctx.match.trim();
    const session = sessions.get(id);
    if (session == null) {
-      await ctx.reply(
-        "Login failed: Invalid session ID",
-        omitUndef({
+      await ctx.reply("Login failed: Invalid session ID", {
        reply_to_message_id: ctx.message?.message_id,
-        }),
-      );
+      });
      return;
    }
    session.userId = ctx.from?.id;
    sessions.set(id, session);
    info(`User ${formatUserChat(ctx)} logged in`);
    // TODO: show link to web ui
-    await ctx.reply(
-      "Login successful! You can now return to the WebUI.",
-      omitUndef({
+    await ctx.reply("Login successful! You can now return to the WebUI.", {
      reply_to_message_id: ctx.message?.message_id,
-      }),
-    );
+    });
    return;
  }

-  await ctx.reply(
-    "Hello! Use the /txt2img command to generate an image",
-    omitUndef({
+  await ctx.reply("Hello! Use the /txt2img command to generate an image", {
    reply_to_message_id: ctx.message?.message_id,
-    }),
-  );
+  });
 });

 bot.command("txt2img", txt2imgCommand);
@ -169,6 +157,30 @@ bot.command("cancel", cancelCommand);

 bot.command("broadcast", broadcastCommand);

+bot.command("pause", async (ctx) => {
+  if (!ctx.from?.username) return;
+  const config = await getConfig();
+  if (!config.adminUsernames.includes(ctx.from.username)) return;
+  if (config.pausedReason != null) {
+    return ctx.reply(`Already paused: ${config.pausedReason}`);
+  }
+  await setConfig({
+    pausedReason: ctx.match || "No reason given",
+  });
+  warning(`Bot paused by ${ctx.from.first_name} because ${config.pausedReason}`);
+  return ctx.reply("Paused");
+});
+
+bot.command("resume", async (ctx) => {
+  if (!ctx.from?.username) return;
+  const config = await getConfig();
+  if (!config.adminUsernames.includes(ctx.from.username)) return;
+  if (config.pausedReason == null) return ctx.reply("Already running");
+  await setConfig({ pausedReason: null });
+  info(`Bot resumed by ${ctx.from.first_name}`);
+  return ctx.reply("Resumed");
+});
+
 bot.command("crash", () => {
  throw new Error("Crash command used");
 });
--- a/bot/parsePngInfo.ts
+++ b/bot/parsePngInfo.ts
@ -3,7 +3,7 @@ import extractChunks from "png_chunks_extract";

 export function getPngInfo(pngData: Uint8Array): string | undefined {
  return extractChunks(pngData)
-    .filter((chunk) => chunk.name === "tEXt")
+    .filter((chunk) => chunk.name === "tEXt" || chunk.name === "iTXt")
    .map((chunk) => decode(chunk.data))
    .find((textChunk) => textChunk.keyword === "parameters")
    ?.text;
@ -38,7 +38,7 @@ export function parsePngInfo(
  for (const tag of tags) {
    const paramValuePair = tag.trim().match(/^(\w+\s*\w*):\s+(.*)$/u);
    if (paramValuePair) {
-      const [_match, param = "", value = ""] = paramValuePair;
+      const [, param, value] = paramValuePair;
      switch (param.replace(/\s+/u, "").toLowerCase()) {
        case "positiveprompt":
        case "positive":
@ -71,7 +71,7 @@ export function parsePngInfo(
        case "size":
        case "resolution": {
          part = "params";
-          const [width = 0, height = 0] = value.trim()
+          const [width, height] = value.trim()
            .split(/\s*[x,]\s*/u, 2)
            .map((v) => v.trim())
            .map(Number);
@ -107,10 +107,8 @@ export function parsePngInfo(
          part = "params";
          if (shouldParseSeed) {
            const seed = Number(value.trim());
-            if (Number.isFinite(seed)) {
            params.seed = seed;
          }
-          }
          break;
        }
        case "model":
--- a/bot/pnginfoCommand.ts
+++ b/bot/pnginfoCommand.ts
@ -1,7 +1,6 @@
 import { CommandContext } from "grammy";
 import { bold, fmt } from "grammy_parse_mode";
 import { StatelessQuestion } from "grammy_stateless_question";
-import { omitUndef } from "../utils/omitUndef.ts";
 import { ErisContext } from "./mod.ts";
 import { getPngInfo, parsePngInfo } from "./parsePngInfo.ts";

@ -24,13 +23,11 @@ async function pnginfo(ctx: ErisContext, includeRepliedTo: boolean): Promise<voi
    await ctx.reply(
      "Please send me a PNG file." +
        pnginfoQuestion.messageSuffixMarkdown(),
-      omitUndef(
      {
        reply_markup: { force_reply: true, selective: true },
        parse_mode: "Markdown",
        reply_to_message_id: ctx.message?.message_id,
-        } as const,
-      ),
+      },
    );
    return;
  }
@ -39,6 +36,13 @@ async function pnginfo(ctx: ErisContext, includeRepliedTo: boolean): Promise<voi
  const buffer = await fetch(file.getUrl()).then((resp) => resp.arrayBuffer());
  const params = parsePngInfo(getPngInfo(new Uint8Array(buffer)) ?? "");

+  if (!params.prompt) {
+    ctx.reply("File doesn't contain any parameters.", {
+      reply_to_message_id: ctx.message?.message_id,
+    });
+    return;
+  }
+
  const paramsText = fmt([
    `${params.prompt}\n`,
    params.negative_prompt ? fmt`${bold("Negative prompt:")} ${params.negative_prompt}\n` : "",
@ -49,11 +53,8 @@ async function pnginfo(ctx: ErisContext, includeRepliedTo: boolean): Promise<voi
    params.width && params.height ? fmt`${bold("Size")}: ${params.width}x${params.height}` : "",
  ]);

-  await ctx.reply(
-    paramsText.text,
-    omitUndef({
+  await ctx.reply(paramsText.text, {
    entities: paramsText.entities,
    reply_to_message_id: ctx.message?.message_id,
-    }),
-  );
+  });
 }
--- a/bot/queueCommand.ts
+++ b/bot/queueCommand.ts
@ -1,20 +1,16 @@
 import { CommandContext } from "grammy";
 import { bold, fmt } from "grammy_parse_mode";
 import { activeGenerationWorkers, generationQueue } from "../app/generationQueue.ts";
-import { workerInstanceStore } from "../app/workerInstanceStore.ts";
 import { getFlagEmoji } from "../utils/getFlagEmoji.ts";
-import { omitUndef } from "../utils/omitUndef.ts";
 import { ErisContext } from "./mod.ts";
+import { workerInstanceStore } from "../app/workerInstanceStore.ts";

 export async function queueCommand(ctx: CommandContext<ErisContext>) {
  let formattedMessage = await getMessageText();
-  const queueMessage = await ctx.replyFmt(
-    formattedMessage,
-    omitUndef({
+  const queueMessage = await ctx.replyFmt(formattedMessage, {
    disable_notification: true,
    reply_to_message_id: ctx.message?.message_id,
-    }),
-  );
+  });
  handleFutureUpdates().catch(() => undefined);

  async function getMessageText() {
--- a/deno.json
+++ b/deno.json
@ -1,35 +1,32 @@
 {
+  "tasks": {
+    "start": "deno run --unstable --allow-env --allow-read --allow-write --allow-net main.ts",
+    "check": "deno check --unstable main.ts && deno check --unstable ui/main.tsx"
+  },
  "compilerOptions": {
-    "exactOptionalPropertyTypes": true,
-    "jsx": "react",
-    "noUncheckedIndexedAccess": true
+    "jsx": "react"
  },
  "fmt": {
    "lineWidth": 100
  },
  "imports": {
+    "@date-fns/utc": "https://cdn.skypack.dev/@date-fns/utc@1.1.0?dts",
    "async": "https://deno.land/x/async@v2.0.2/mod.ts",
    "date-fns": "https://cdn.skypack.dev/date-fns@2.30.0?dts",
-    "date-fns/utc": "https://cdn.skypack.dev/@date-fns/utc@1.1.0?dts",
    "file_type": "https://esm.sh/file-type@18.5.0",
-    "grammy": "https://lib.deno.dev/x/grammy@1/mod.ts",
    "grammy_autoquote": "https://lib.deno.dev/x/grammy_autoquote@1/mod.ts",
    "grammy_files": "https://lib.deno.dev/x/grammy_files@1/mod.ts",
    "grammy_parse_mode": "https://lib.deno.dev/x/grammy_parse_mode@1/mod.ts",
    "grammy_runner": "https://lib.deno.dev/x/grammy_runner@2/mod.ts",
    "grammy_stateless_question": "https://lib.deno.dev/x/grammy_stateless_question_alpha@3/mod.ts",
    "grammy_types": "https://lib.deno.dev/x/grammy_types@3/mod.ts",
-    "indexed_kv": "https://deno.land/x/indexed_kv@v0.6.1/mod.ts",
+    "grammy": "https://lib.deno.dev/x/grammy@1/mod.ts",
+    "indexed_kv": "https://deno.land/x/indexed_kv@v0.5.0/mod.ts",
    "kvfs": "https://deno.land/x/kvfs@v0.1.0/mod.ts",
    "kvmq": "https://deno.land/x/kvmq@v0.3.0/mod.ts",
    "openapi_fetch": "https://esm.sh/openapi-fetch@0.7.6",
    "png_chunk_text": "https://esm.sh/png-chunk-text@1.0.0",
    "png_chunks_extract": "https://esm.sh/png-chunks-extract@1.0.0",
-    "react": "https://esm.sh/react@18.2.0?dev",
-    "react-dom/client": "https://esm.sh/react-dom@18.2.0/client?external=react&dev",
-    "react-flip-move": "https://esm.sh/react-flip-move@3.0.5?external=react&dev",
-    "react-intl": "https://esm.sh/react-intl@6.4.7?external=react&dev",
-    "react-router-dom": "https://esm.sh/react-router-dom@6.16.0?external=react&dev",
    "reroute": "https://deno.land/x/reroute@v0.1.0/mod.ts",
    "serve_spa": "https://deno.land/x/serve_spa@v0.2.0/mod.ts",
    "std/async/": "https://deno.land/std@0.201.0/async/",
@ -39,25 +36,19 @@
    "std/fmt/": "https://deno.land/std@0.202.0/fmt/",
    "std/log/": "https://deno.land/std@0.201.0/log/",
    "std/path/": "https://deno.land/std@0.204.0/path/",
-    "swr": "https://esm.sh/swr@2.2.4?external=react&dev",
-    "swr/mutation": "https://esm.sh/swr@2.2.4/mutation?external=react&dev",
-    "t_rest/client": "https://esm.sh/ty-rest@0.4.1/client",
-    "t_rest/server": "https://esm.sh/ty-rest@0.4.1/server",
-    "twind/core": "https://esm.sh/@twind/core@1.1.3",
-    "twind/preset-tailwind": "https://esm.sh/@twind/preset-tailwind@1.1.4",
-    "ulid": "https://deno.land/x/ulid@v0.3.0/mod.ts"
-  },
-  "lint": {
-    "rules": {
-      "exclude": [
-        "require-await"
-      ]
-    }
-  },
-  "tasks": {
-    "check": "deno check --unstable main.ts && deno check --unstable ui/main.tsx",
-    "generate": "deno run npm:openapi-typescript http://localhost:7861/openapi.json -o app/sdApi.ts",
-    "start": "deno run --unstable --allow-env --allow-read --allow-write --allow-net main.ts",
-    "test": "deno test --unstable"
+    "t_rest/server": "https://esm.sh/ty-rest@0.4.0/server?dev",
+    "ulid": "https://deno.land/x/ulid@v0.3.0/mod.ts",
+
+    "@twind/core": "https://esm.sh/@twind/core@1.1.3?dev",
+    "@twind/preset-tailwind": "https://esm.sh/@twind/preset-tailwind@1.1.4?dev",
+    "react-dom/client": "https://esm.sh/react-dom@18.2.0/client?dev",
+    "react-flip-move": "https://esm.sh/react-flip-move@3.0.5?dev",
+    "react-intl": "https://esm.sh/react-intl@6.4.7?external=react&alias=@types/react:react&dev",
+    "react-router-dom": "https://esm.sh/react-router-dom@6.16.0?dev",
+    "react": "https://esm.sh/react@18.2.0?dev",
+    "swr": "https://esm.sh/swr@2.2.4?dev",
+    "swr/mutation": "https://esm.sh/swr@2.2.4/mutation?dev",
+    "t_rest/client": "https://esm.sh/ty-rest@0.4.0/client?dev",
+    "use-local-storage": "https://esm.sh/use-local-storage@3.0.0?dev"
  }
 }
--- a/deno.lock
+++ b/deno.lock
@ -2,33 +2,33 @@
  "version": "3",
  "packages": {
    "specifiers": {
-      "npm:@types/node": "npm:@types/node@18.16.19"
+      "npm:telegram-format@2": "npm:telegram-format@2.1.0"
    },
    "npm": {
-      "@types/node@18.16.19": {
-        "integrity": "sha512-IXl7o+R9iti9eBW4Wg2hx1xQDig183jj7YLn8F7udNceyfkbn1ZxmzZXuak20gR40D7pIkIY1kYGx5VIGbaHKA==",
+      "telegram-format@2.1.0": {
+        "integrity": "sha512-V2thkhKzcNVL26h/ANeat/Z+AXBaDGoizs4cab6Kpq/w+d+Ai6M/AFFkuBwvCkZXqb+7UW2vt3Dko5+kKcOIHg==",
        "dependencies": {}
      }
    }
  },
  "redirects": {
    "https://cdn.skypack.dev/-/@date-fns/utc@v1.1.0-EKCmNY9452DyFBJfVVmZ/dist=es2019,mode=types/date.d.ts": "https://cdn.skypack.dev/-/@date-fns/utc@v1.1.0-EKCmNY9452DyFBJfVVmZ/dist=es2019,mode=types/date/index.d.ts",
+    "https://deno.land/std/path/mod.ts": "https://deno.land/std@0.204.0/path/mod.ts",
    "https://esm.sh/@grammyjs/types@2": "https://esm.sh/@grammyjs/types@2.12.1",
    "https://esm.sh/@grammyjs/types@v2": "https://esm.sh/@grammyjs/types@2.0.0",
    "https://esm.sh/@swc/core@1.2.212/types.d.ts": "https://esm.sh/v133/@swc/core@1.2.212/types.d.ts",
-    "https://esm.sh/telegram-format@2": "https://esm.sh/telegram-format@2.1.0",
    "https://esm.sh/v128/@types/react@~18.2/index.d.ts": "https://esm.sh/v128/@types/react@18.2.25/index.d.ts",
-    "https://esm.sh/v133/@types/png-chunk-text@~1.0/index.d.ts": "https://esm.sh/v133/@types/png-chunk-text@1.0.2/index.d.ts",
-    "https://esm.sh/v133/@types/png-chunks-extract@~1.0/index.d.ts": "https://esm.sh/v133/@types/png-chunks-extract@1.0.1/index.d.ts",
-    "https://esm.sh/v133/@types/react-dom@~18.2/X-ZS9yZWFjdA/client~.d.ts": "https://esm.sh/v133/@types/react-dom@18.2.14/X-ZS9yZWFjdA/client~.d.ts",
-    "https://lib.deno.dev/x/grammy@1/mod.ts": "https://deno.land/x/grammy@v1.19.2/mod.ts",
-    "https://lib.deno.dev/x/grammy@^1.0/mod.ts": "https://deno.land/x/grammy@v1.19.2/mod.ts",
-    "https://lib.deno.dev/x/grammy@v1/mod.ts": "https://deno.land/x/grammy@v1.19.2/mod.ts",
-    "https://lib.deno.dev/x/grammy@v1/types.ts": "https://deno.land/x/grammy@v1.19.2/types.ts",
+    "https://esm.sh/v133/@types/png-chunk-text@~1.0/index.d.ts": "https://esm.sh/v133/@types/png-chunk-text@1.0.1/index.d.ts",
+    "https://esm.sh/v133/@types/png-chunks-extract@~1.0/index.d.ts": "https://esm.sh/v133/@types/png-chunks-extract@1.0.0/index.d.ts",
+    "https://esm.sh/v133/@types/react-dom@~18.2/client~.d.ts": "https://esm.sh/v133/@types/react-dom@18.2.13/client~.d.ts",
+    "https://lib.deno.dev/x/grammy@1/mod.ts": "https://deno.land/x/grammy@v1.19.1/mod.ts",
+    "https://lib.deno.dev/x/grammy@^1.0/mod.ts": "https://deno.land/x/grammy@v1.19.1/mod.ts",
+    "https://lib.deno.dev/x/grammy@v1/mod.ts": "https://deno.land/x/grammy@v1.19.1/mod.ts",
+    "https://lib.deno.dev/x/grammy@v1/types.ts": "https://deno.land/x/grammy@v1.19.1/types.ts",
    "https://lib.deno.dev/x/grammy_files@1/mod.ts": "https://deno.land/x/grammy_files@v1.0.4/mod.ts",
    "https://lib.deno.dev/x/grammy_parse_mode@1/mod.ts": "https://deno.land/x/grammy_parse_mode@1.8.1/mod.ts",
    "https://lib.deno.dev/x/grammy_runner@2/mod.ts": "https://deno.land/x/grammy_runner@v2.0.3/mod.ts",
-    "https://lib.deno.dev/x/grammy_stateless_question_alpha@3/mod.ts": "https://deno.land/x/grammy_stateless_question_alpha@v3.0.5/mod.ts",
+    "https://lib.deno.dev/x/grammy_stateless_question_alpha@3/mod.ts": "https://deno.land/x/grammy_stateless_question_alpha@v3.0.4/mod.ts",
    "https://lib.deno.dev/x/grammy_types@3/mod.ts": "https://deno.land/x/grammy_types@v3.3.0/mod.ts"
  },
  "remote": {
@ -235,25 +235,25 @@
    "https://deno.land/x/async@v2.0.2/stack.ts": "e24ebcbdcab032783e6b278b938475c221fbfb86f8eb71d3752679fcdf132d42",
    "https://deno.land/x/async@v2.0.2/state.ts": "a71692b72371239120b196d0c6a249631bab867dd499e85c422c2e5ec9695999",
    "https://deno.land/x/async@v2.0.2/testutil.ts": "c4b4092066ad6f24cf84012781831ff188e656a1e81abf31b0f712d2e1ad07b7",
-    "https://deno.land/x/grammy@v1.19.2/bot.ts": "8d13cd72f1512e3f76d685131c7d0db5ba51f2c877db5ac2c0aa4b0f6f876aa8",
-    "https://deno.land/x/grammy@v1.19.2/composer.ts": "8660f86990f4ef2afc4854a1f2610bb8d60f88116f3a57c8e5515a77b277f82d",
-    "https://deno.land/x/grammy@v1.19.2/context.ts": "4cf51ed7538750edb4379f757f6b8b3c1f3987242d58393160b463c9ca13c997",
-    "https://deno.land/x/grammy@v1.19.2/convenience/constants.ts": "3be0f6393ab2b2995fad6bcd4c9cf8a1a615ae4543fc864c107ba0dd38f123f6",
-    "https://deno.land/x/grammy@v1.19.2/convenience/frameworks.ts": "77e2f9fc841ab92d4310b556126447a42f131ad976a6adfff454c016f339b28e",
-    "https://deno.land/x/grammy@v1.19.2/convenience/inline_query.ts": "409d1940c7670708064efa495003bcbfdf6763a756b2e6303c464489fd3394ff",
-    "https://deno.land/x/grammy@v1.19.2/convenience/input_media.ts": "7af72a5fdb1af0417e31b1327003f536ddfdf64e06ab8bc7f5da6b574de38658",
-    "https://deno.land/x/grammy@v1.19.2/convenience/keyboard.ts": "21220dc2321c40203c699fa4eb7b07ed8217956ea0477c241a551224a58a278d",
-    "https://deno.land/x/grammy@v1.19.2/convenience/session.ts": "f92d57b6b2b61920912cf5c44d4db2f6ca999fe4f9adef170c321889d49667c2",
-    "https://deno.land/x/grammy@v1.19.2/convenience/webhook.ts": "f1da7d6426171fb7b5d5f6b59633f91d3bab9a474eea821f714932650965eb9e",
-    "https://deno.land/x/grammy@v1.19.2/core/api.ts": "7d4d8df3567e322ab3b793360ee48da09f46ad531ef994a87b3e6aef4ec23bf2",
-    "https://deno.land/x/grammy@v1.19.2/core/client.ts": "39639e4f5fc3a3f9d528c6906d7e3cdc268cf5d33929eeab801bb39642a59103",
-    "https://deno.land/x/grammy@v1.19.2/core/error.ts": "4638b2127ebe60249c78b83011d468f5e1e1a87748d32fe11a8200d9f824ad13",
-    "https://deno.land/x/grammy@v1.19.2/core/payload.ts": "420e17c3c2830b5576ea187cfce77578fe09f1204b25c25ea2f220ca7c86e73b",
-    "https://deno.land/x/grammy@v1.19.2/filter.ts": "201ddac882ab6cd46cae2d18eb8097460dfe7cedadaab2ba16959c5286d5a5f1",
-    "https://deno.land/x/grammy@v1.19.2/mod.ts": "b81cccf69779667b36bef5d0373d1567684917a3b9827873f3de7a7e6af1926f",
-    "https://deno.land/x/grammy@v1.19.2/platform.deno.ts": "84735643c8dde2cf8af5ac2e6b8eb0768452260878da93238d673cb1b4ccea55",
-    "https://deno.land/x/grammy@v1.19.2/types.deno.ts": "0f47eacde6d3d65f107f2abf16ecfe726298d30263367cc82e977c801b766229",
-    "https://deno.land/x/grammy@v1.19.2/types.ts": "729415590dfa188dbe924dea614dff4e976babdbabb28a307b869fc25777cdf0",
+    "https://deno.land/x/grammy@v1.19.1/bot.ts": "ff38517817fdc104ed2ef0ab210d5ba1f67675510eabe33b74abd1e586b91316",
+    "https://deno.land/x/grammy@v1.19.1/composer.ts": "8660f86990f4ef2afc4854a1f2610bb8d60f88116f3a57c8e5515a77b277f82d",
+    "https://deno.land/x/grammy@v1.19.1/context.ts": "4cf51ed7538750edb4379f757f6b8b3c1f3987242d58393160b463c9ca13c997",
+    "https://deno.land/x/grammy@v1.19.1/convenience/constants.ts": "3be0f6393ab2b2995fad6bcd4c9cf8a1a615ae4543fc864c107ba0dd38f123f6",
+    "https://deno.land/x/grammy@v1.19.1/convenience/frameworks.ts": "4d4e5ecdcb4f48d3b317c35d8201800c45002e1e195af1b5d7609617f4bdc656",
+    "https://deno.land/x/grammy@v1.19.1/convenience/inline_query.ts": "409d1940c7670708064efa495003bcbfdf6763a756b2e6303c464489fd3394ff",
+    "https://deno.land/x/grammy@v1.19.1/convenience/input_media.ts": "7af72a5fdb1af0417e31b1327003f536ddfdf64e06ab8bc7f5da6b574de38658",
+    "https://deno.land/x/grammy@v1.19.1/convenience/keyboard.ts": "21220dc2321c40203c699fa4eb7b07ed8217956ea0477c241a551224a58a278d",
+    "https://deno.land/x/grammy@v1.19.1/convenience/session.ts": "f92d57b6b2b61920912cf5c44d4db2f6ca999fe4f9adef170c321889d49667c2",
+    "https://deno.land/x/grammy@v1.19.1/convenience/webhook.ts": "f1da7d6426171fb7b5d5f6b59633f91d3bab9a474eea821f714932650965eb9e",
+    "https://deno.land/x/grammy@v1.19.1/core/api.ts": "7d4d8df3567e322ab3b793360ee48da09f46ad531ef994a87b3e6aef4ec23bf2",
+    "https://deno.land/x/grammy@v1.19.1/core/client.ts": "39639e4f5fc3a3f9d528c6906d7e3cdc268cf5d33929eeab801bb39642a59103",
+    "https://deno.land/x/grammy@v1.19.1/core/error.ts": "4638b2127ebe60249c78b83011d468f5e1e1a87748d32fe11a8200d9f824ad13",
+    "https://deno.land/x/grammy@v1.19.1/core/payload.ts": "420e17c3c2830b5576ea187cfce77578fe09f1204b25c25ea2f220ca7c86e73b",
+    "https://deno.land/x/grammy@v1.19.1/filter.ts": "201ddac882ab6cd46cae2d18eb8097460dfe7cedadaab2ba16959c5286d5a5f1",
+    "https://deno.land/x/grammy@v1.19.1/mod.ts": "b81cccf69779667b36bef5d0373d1567684917a3b9827873f3de7a7e6af1926f",
+    "https://deno.land/x/grammy@v1.19.1/platform.deno.ts": "84735643c8dde2cf8af5ac2e6b8eb0768452260878da93238d673cb1b4ccea55",
+    "https://deno.land/x/grammy@v1.19.1/types.deno.ts": "0f47eacde6d3d65f107f2abf16ecfe726298d30263367cc82e977c801b766229",
+    "https://deno.land/x/grammy@v1.19.1/types.ts": "729415590dfa188dbe924dea614dff4e976babdbabb28a307b869fc25777cdf0",
    "https://deno.land/x/grammy_files@v1.0.4/deps.deno.ts": "ec398579e7a7f69788fc3c3ef90202bc9e031e13bfbd90ee37c88a655b6742ef",
    "https://deno.land/x/grammy_files@v1.0.4/files.ts": "c69a4cfdcf5b75f32b9de97c36e2b197fe9d60feb360b71e89dff5ae22ba1114",
    "https://deno.land/x/grammy_files@v1.0.4/mod.ts": "379c5f64594cd879653cdce715c318b3eed29ab26e071f356b9b61f9e3943bc3",
@ -273,10 +273,10 @@
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    "https://deno.land/x/grammy_runner@v2.0.3/source.ts": "68ce5aefa92205db4710c8ac313e0c8e8c2577dd1b88f350b32ee33549188d01",
    "https://deno.land/x/grammy_runner@v2.0.3/worker.ts": "b6f88b9fde15a8dd892c8d4781e8010ef37b80faf04d6ad18db4a43e4faa42ad",
-    "https://deno.land/x/grammy_stateless_question_alpha@v3.0.5/mod.ts": "2c634ee172fa86da8581ccee02eb43a1af5f377837ee78668dd6dbea446038ab",
-    "https://deno.land/x/grammy_stateless_question_alpha@v3.0.5/source/deps.ts": "05a3cae17af42ec058729e14cc544f22eae8bde4792dab652f7a452a00e91301",
-    "https://deno.land/x/grammy_stateless_question_alpha@v3.0.5/source/identifier.ts": "162971fdfa5d48484c4db6ce664d60af27affb5e0bfdab41c065200332b30226",
-    "https://deno.land/x/grammy_stateless_question_alpha@v3.0.5/source/index.ts": "b3272436230d7f19f1e9ee515c52e03bbd20ff6963da9b4076d4d3e6935d969d",
+    "https://deno.land/x/grammy_stateless_question_alpha@v3.0.4/mod.ts": "2c634ee172fa86da8581ccee02eb43a1af5f377837ee78668dd6dbea446038ab",
+    "https://deno.land/x/grammy_stateless_question_alpha@v3.0.4/source/deps.ts": "4b45ad28d0514ed55d7e2cd54d7d6fefa3cbc7680b38b8f6ce01d25137350deb",
+    "https://deno.land/x/grammy_stateless_question_alpha@v3.0.4/source/identifier.ts": "162971fdfa5d48484c4db6ce664d60af27affb5e0bfdab41c065200332b30226",
+    "https://deno.land/x/grammy_stateless_question_alpha@v3.0.4/source/index.ts": "b3272436230d7f19f1e9ee515c52e03bbd20ff6963da9b4076d4d3e6935d969d",
    "https://deno.land/x/grammy_types@v3.3.0/api.ts": "efc90a31eb6f59ae5e7a4cf5838f46529e2fa6fa7e97a51a82dbd28afad21592",
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@ -288,7 +288,7 @@
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+    "https://deno.land/x/indexed_kv@v0.5.0/mod.ts": "8a0598817202231dbc0be25149d68c21bca82064303270725764814ee43292ea",
    "https://deno.land/x/kvfs@v0.1.0/mod.ts": "ceb4c28a6ed850f2fe40bf2349fc8564406811349c7dd6be615db3f098b0790e",
    "https://deno.land/x/kvmq@v0.3.0/mod.ts": "ce39abbef6a8f0c25a9141dcac82ef165d4ad74a78289eace7bb168bbc645806",
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@ -300,69 +300,63 @@
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  }
 }
--- a/ui/AdminsPage.tsx
+++ b/ui/AdminsPage.tsx
@ -1,250 +0,0 @@
-import React, { useRef } from "react";
-import useSWR, { useSWRConfig } from "swr";
-import { AdminData } from "../api/adminsRoute.ts";
-import { fetchApi, handleResponse } from "./apiClient.ts";
-
-export function AdminsPage(props: { sessionId: string | null }) {
-  const { sessionId } = props;
-
-  const { mutate } = useSWRConfig();
-
-  const addDialogRef = useRef<HTMLDialogElement>(null);
-
-  const getSession = useSWR(
-    sessionId ? ["sessions/{sessionId}", "GET", { params: { sessionId } }] as const : null,
-    (args) => fetchApi(...args).then(handleResponse),
-  );
-  const getUser = useSWR(
-    getSession.data?.userId
-      ? ["users/{userId}", "GET", { params: { userId: String(getSession.data.userId) } }] as const
-      : null,
-    (args) => fetchApi(...args).then(handleResponse),
-  );
-
-  const getAdmins = useSWR(
-    ["admins", "GET", {}] as const,
-    (args) => fetchApi(...args).then(handleResponse),
-  );
-
-  return (
-    <>
-      {getUser.data && getAdmins.data && getAdmins.data.length === 0 && (
-        <button
-          className="button-filled"
-          onClick={() => {
-            mutate(
-              (key) => Array.isArray(key) && key[0] === "admins",
-              async () =>
-                fetchApi("admins/promote_self", "POST", {
-                  query: { sessionId: sessionId ?? "" },
-                }).then(handleResponse),
-              { populateCache: false },
-            );
-          }}
-        >
-          Promote me to admin
-        </button>
-      )}
-
-      {getAdmins.data?.length
-        ? (
-          <ul className="my-4 flex flex-col gap-2">
-            {getAdmins.data.map((admin) => (
-              <AdminListItem key={admin.id} admin={admin} sessionId={sessionId} />
-            ))}
-          </ul>
-        )
-        : getAdmins.data?.length === 0
-        ? <p>No admins</p>
-        : getAdmins.error
-        ? <p className="alert">Loading admins failed</p>
-        : <div className="spinner self-center" />}
-
-      {getUser.data?.admin && (
-        <button
-          className="button-filled"
-          onClick={() => addDialogRef.current?.showModal()}
-        >
-          Add admin
-        </button>
-      )}
-
-      <AddAdminDialog
-        dialogRef={addDialogRef}
-        sessionId={sessionId}
-      />
-    </>
-  );
-}
-
-function AddAdminDialog(props: {
-  dialogRef: React.RefObject<HTMLDialogElement>;
-  sessionId: string | null;
-}) {
-  const { dialogRef, sessionId } = props;
-
-  const { mutate } = useSWRConfig();
-
-  return (
-    <dialog ref={dialogRef} className="dialog animate-pop-in backdrop-animate-fade-in">
-      <form
-        method="dialog"
-        className="flex flex-col gap-4 p-4"
-        onSubmit={(e) => {
-          e.preventDefault();
-          const data = new FormData(e.target as HTMLFormElement);
-          mutate(
-            (key) => Array.isArray(key) && key[0] === "admins",
-            async () =>
-              fetchApi("admins", "POST", {
-                query: { sessionId: sessionId! },
-                body: {
-                  type: "application/json",
-                  data: {
-                    tgUserId: Number(data.get("tgUserId") as string),
-                  },
-                },
-              }).then(handleResponse),
-            { populateCache: false },
-          );
-          dialogRef.current?.close();
-        }}
-      >
-        <label className="flex flex-col items-stretch gap-1">
-          <span className="text-sm">
-            Telegram user ID
-          </span>
-          <input
-            className="input-text"
-            type="text"
-            name="tgUserId"
-            required
-            pattern="-?\d+"
-          />
-        </label>
-
-        <div className="flex gap-2 items-center justify-end">
-          <button
-            type="button"
-            className="button-outlined"
-            onClick={() => dialogRef.current?.close()}
-          >
-            Close
-          </button>
-          <button type="submit" className="button-filled">
-            Save
-          </button>
-        </div>
-      </form>
-    </dialog>
-  );
-}
-
-function AdminListItem(props: { admin: AdminData; sessionId: string | null }) {
-  const { admin, sessionId } = props;
-
-  const deleteDialogRef = useRef<HTMLDialogElement>(null);
-
-  const getAdminUser = useSWR(
-    ["users/{userId}", "GET", { params: { userId: String(admin.tgUserId) } }] as const,
-    (args) => fetchApi(...args).then(handleResponse),
-  );
-
-  const getSession = useSWR(
-    sessionId ? ["sessions/{sessionId}", "GET", { params: { sessionId } }] as const : null,
-    (args) => fetchApi(...args).then(handleResponse),
-  );
-  const getUser = useSWR(
-    getSession.data?.userId
-      ? ["users/{userId}", "GET", { params: { userId: String(getSession.data.userId) } }] as const
-      : null,
-    (args) => fetchApi(...args).then(handleResponse),
-  );
-
-  return (
-    <li className="flex flex-col gap-2 rounded-md bg-zinc-100 dark:bg-zinc-800 p-2">
-      <p className="font-bold">
-        {getAdminUser.data?.first_name ?? admin.id} {getAdminUser.data?.last_name}{" "}
-        {getAdminUser.data?.username
-          ? (
-            <a href={`https://t.me/${getAdminUser.data.username}`} className="link">
-              @{getAdminUser.data.username}
-            </a>
-          )
-          : null}
-      </p>
-      {getAdminUser.data?.bio
-        ? (
-          <p>
-            {getAdminUser.data?.bio}
-          </p>
-        )
-        : null}
-      {getUser.data?.admin && (
-        <p className="flex gap-2">
-          <button
-            className="button-outlined"
-            onClick={() => deleteDialogRef.current?.showModal()}
-          >
-            Delete
-          </button>
-        </p>
-      )}
-      <DeleteAdminDialog
-        dialogRef={deleteDialogRef}
-        adminId={admin.id}
-        sessionId={sessionId}
-      />
-    </li>
-  );
-}
-
-function DeleteAdminDialog(props: {
-  dialogRef: React.RefObject<HTMLDialogElement>;
-  adminId: string;
-  sessionId: string | null;
-}) {
-  const { dialogRef, adminId, sessionId } = props;
-  const { mutate } = useSWRConfig();
-
-  return (
-    <dialog
-      ref={dialogRef}
-      className="dialog animate-pop-in backdrop-animate-fade-in"
-    >
-      <form
-        method="dialog"
-        className="flex flex-col gap-4 p-4"
-        onSubmit={(e) => {
-          e.preventDefault();
-          mutate(
-            (key) => Array.isArray(key) && key[0] === "admins",
-            async () =>
-              fetchApi("admins/{adminId}", "DELETE", {
-                query: { sessionId: sessionId! },
-                params: { adminId: adminId },
-              }).then(handleResponse),
-            { populateCache: false },
-          );
-          dialogRef.current?.close();
-        }}
-      >
-        <p>
-          Are you sure you want to delete this admin?
-        </p>
-        <div className="flex gap-2 items-center justify-end">
-          <button
-            type="button"
-            className="button-outlined"
-            onClick={() => dialogRef.current?.close()}
-          >
-            Close
-          </button>
-          <button type="submit" className="button-filled">
-            Delete
-          </button>
-        </div>
-      </form>
-    </dialog>
-  );
-}
--- a/ui/App.tsx
+++ b/ui/App.tsx
@ -1,17 +1,16 @@
 import React, { useEffect } from "react";
 import { Route, Routes } from "react-router-dom";
-import { AdminsPage } from "./AdminsPage.tsx";
+import useLocalStorage from "use-local-storage";
 import { AppHeader } from "./AppHeader.tsx";
 import { QueuePage } from "./QueuePage.tsx";
 import { SettingsPage } from "./SettingsPage.tsx";
 import { StatsPage } from "./StatsPage.tsx";
 import { WorkersPage } from "./WorkersPage.tsx";
-import { fetchApi, handleResponse } from "./apiClient.ts";
-import { useLocalStorage } from "./useLocalStorage.ts";
+import { fetchApi, handleResponse } from "./apiClient.tsx";

 export function App() {
  // store session ID in the local storage
-  const [sessionId, setSessionId] = useLocalStorage("sessionId");
+  const [sessionId, setSessionId] = useLocalStorage("sessionId", "");

  // initialize a new session when there is no session ID
  useEffect(() => {
@ -28,12 +27,11 @@ export function App() {
      <AppHeader
        className="self-stretch"
        sessionId={sessionId}
-        onLogOut={() => setSessionId(null)}
+        onLogOut={() => setSessionId("")}
      />
      <div className="self-center w-full max-w-screen-md flex flex-col items-stretch gap-4 p-4">
        <Routes>
          <Route path="/" element={<StatsPage />} />
-          <Route path="/admins" element={<AdminsPage sessionId={sessionId} />} />
          <Route path="/workers" element={<WorkersPage sessionId={sessionId} />} />
          <Route path="/queue" element={<QueuePage />} />
          <Route path="/settings" element={<SettingsPage sessionId={sessionId} />} />
--- a/ui/AppHeader.tsx
+++ b/ui/AppHeader.tsx
@ -1,8 +1,8 @@
+import { cx } from "@twind/core";
 import React, { ReactNode } from "react";
 import { NavLink } from "react-router-dom";
 import useSWR from "swr";
-import { cx } from "twind/core";
-import { fetchApi, handleResponse } from "./apiClient.ts";
+import { fetchApi, handleResponse } from "./apiClient.tsx";

 function NavTab(props: { to: string; children: ReactNode }) {
  return (
@ -15,35 +15,32 @@ function NavTab(props: { to: string; children: ReactNode }) {
  );
 }

-export function AppHeader(props: {
-  className?: string;
-  sessionId: string | null;
-  onLogOut: () => void;
-}) {
+export function AppHeader(
+  props: { className?: string; sessionId?: string; onLogOut: () => void },
+) {
  const { className, sessionId, onLogOut } = props;

-  const getSession = useSWR(
+  const session = useSWR(
    sessionId ? ["sessions/{sessionId}", "GET", { params: { sessionId } }] as const : null,
    (args) => fetchApi(...args).then(handleResponse),
    { onError: () => onLogOut() },
  );

-  const getUser = useSWR(
-    getSession.data?.userId
-      ? ["users/{userId}", "GET", { params: { userId: String(getSession.data.userId) } }] as const
+  const user = useSWR(
+    session.data?.userId
+      ? ["users/{userId}", "GET", { params: { userId: String(session.data.userId) } }] as const
      : null,
    (args) => fetchApi(...args).then(handleResponse),
  );

-  const getBot = useSWR(
-    ["bot", "GET", {}] as const,
-    (args) => fetchApi(...args).then(handleResponse),
+  const bot = useSWR(
+    ['bot',"GET",{}] as const, (args) => fetchApi(...args).then(handleResponse),
  );

-  const getUserPhoto = useSWR(
-    getSession.data?.userId
+  const userPhoto = useSWR(
+    session.data?.userId
      ? ["users/{userId}/photo", "GET", {
-        params: { userId: String(getSession.data.userId) },
+        params: { userId: String(session.data.userId) },
      }] as const
      : null,
    (args) => fetchApi(...args).then(handleResponse).then((blob) => URL.createObjectURL(blob)),
@ -64,9 +61,6 @@ export function AppHeader(props: {
        <NavTab to="/">
          Stats
        </NavTab>
-        <NavTab to="/admins">
-          Admins
-        </NavTab>
        <NavTab to="/workers">
          Workers
        </NavTab>
@ -79,29 +73,29 @@ export function AppHeader(props: {
      </nav>

      {/* loading indicator */}
-      {getSession.isLoading || getUser.isLoading ? <div className="spinner" /> : null}
+      {session.isLoading || user.isLoading ? <div className="spinner" /> : null}

      {/* user avatar */}
-      {getUser.data
-        ? getUserPhoto.data
+      {user.data
+        ? userPhoto.data
          ? (
            <img
-              src={getUserPhoto.data}
+              src={userPhoto.data}
              alt="avatar"
              className="w-9 h-9 rounded-full"
            />
          )
          : (
            <div className="w-9 h-9 rounded-full bg-zinc-400 dark:bg-zinc-500 flex items-center justify-center text-white text-2xl font-bold select-none">
-              {getUser.data.first_name.at(0)?.toUpperCase()}
+              {user.data.first_name.at(0)?.toUpperCase()}
            </div>
          )
        : null}

      {/* login/logout button */}
-      {!getSession.isLoading && !getUser.isLoading && getBot.data && sessionId
+      {!session.isLoading && !user.isLoading && bot.data && sessionId
        ? (
-          getUser.data
+          user.data
            ? (
              <button className="button-outlined" onClick={() => onLogOut()}>
                Logout
@ -110,7 +104,7 @@ export function AppHeader(props: {
            : (
              <a
                className="button-filled"
-                href={`https://t.me/${getBot.data.username}?start=${sessionId}`}
+                href={`https://t.me/${bot.data.username}?start=${sessionId}`}
                target="_blank"
              >
                Login
--- a/ui/Counter.tsx
+++ b/ui/Counter.tsx
@ -1,7 +1,7 @@
+import { cx } from "@twind/core";
 import React from "react";
-import { cx } from "twind/core";

-function CounterDigit(props: { value: number; transitionDurationMs?: number | undefined }) {
+function CounterDigit(props: { value: number; transitionDurationMs?: number }) {
  const { value, transitionDurationMs = 1500 } = props;
  const rads = -(Math.floor(value) % 1_000_000) * 2 * Math.PI * 0.1;

@ -36,10 +36,10 @@ const CounterText = (props: { children: React.ReactNode }) => (
 export function Counter(props: {
  value: number;
  digits: number;
-  fractionDigits?: number | undefined;
-  transitionDurationMs?: number | undefined;
-  className?: string | undefined;
-  postfix?: string | undefined;
+  fractionDigits?: number;
+  transitionDurationMs?: number;
+  className?: string;
+  postfix?: string;
 }) {
  const { value, digits, fractionDigits = 0, transitionDurationMs, className, postfix } = props;

--- a/ui/Progress.tsx
+++ b/ui/Progress.tsx
@ -1,5 +1,5 @@
+import { cx } from "@twind/core";
 import React from "react";
-import { cx } from "twind/core";

 export function Progress(props: { value: number; className?: string }) {
  const { value, className } = props;
--- a/ui/QueuePage.tsx
+++ b/ui/QueuePage.tsx
@ -3,10 +3,10 @@ import FlipMove from "react-flip-move";
 import useSWR from "swr";
 import { getFlagEmoji } from "../utils/getFlagEmoji.ts";
 import { Progress } from "./Progress.tsx";
-import { fetchApi, handleResponse } from "./apiClient.ts";
+import { fetchApi, handleResponse } from "./apiClient.tsx";

 export function QueuePage() {
-  const getJobs = useSWR(
+  const jobs = useSWR(
    ["jobs", "GET", {}] as const,
    (args) => fetchApi(...args).then(handleResponse),
    { refreshInterval: 2000 },
@ -19,7 +19,7 @@ export function QueuePage() {
      enterAnimation="fade"
      leaveAnimation="fade"
    >
-      {getJobs.data?.map((job) => (
+      {jobs.data?.map((job) => (
        <li
          className="flex items-baseline gap-2 bg-zinc-100 dark:bg-zinc-700 px-2 py-1 rounded-xl"
          key={job.id.join("/")}
--- a/ui/SettingsPage.tsx
+++ b/ui/SettingsPage.tsx
@ -1,82 +1,79 @@
-import React, { useState } from "react";
+import { cx } from "@twind/core";
+import React, { ReactNode, useState } from "react";
 import useSWR from "swr";
-import { cx } from "twind/core";
-import { fetchApi, handleResponse } from "./apiClient.ts";
+import { fetchApi, handleResponse } from "./apiClient.tsx";

-export function SettingsPage(props: { sessionId: string | null }) {
+export function SettingsPage(props: { sessionId: string }) {
  const { sessionId } = props;
-
-  const getSession = useSWR(
+  const session = useSWR(
    sessionId ? ["sessions/{sessionId}", "GET", { params: { sessionId } }] as const : null,
    (args) => fetchApi(...args).then(handleResponse),
  );
-  const getUser = useSWR(
-    getSession.data?.userId
-      ? ["users/{userId}", "GET", { params: { userId: String(getSession.data.userId) } }] as const
+  const user = useSWR(
+    session.data?.userId
+      ? ["users/{userId}", "GET", { params: { userId: String(session.data.userId) } }] as const
      : null,
    (args) => fetchApi(...args).then(handleResponse),
  );
-  const getParams = useSWR(
+  const params = useSWR(
    ["settings/params", "GET", {}] as const,
    (args) => fetchApi(...args).then(handleResponse),
  );
-  const [newParams, setNewParams] = useState<Partial<typeof getParams.data>>({});
-  const [patchParamsError, setPatchParamsError] = useState<string>();
+  const [changedParams, setChangedParams] = useState<Partial<typeof params.data>>({});
+  const [error, setError] = useState<string>();

  return (
    <form
      className="flex flex-col items-stretch gap-4"
      onSubmit={(e) => {
        e.preventDefault();
-        getParams.mutate(() =>
+        params.mutate(() =>
          fetchApi("settings/params", "PATCH", {
-            query: { sessionId: sessionId ?? "" },
-            body: { type: "application/json", data: newParams ?? {} },
+            query: { sessionId },
+            body: { type: "application/json", data: changedParams ?? {} },
          }).then(handleResponse)
        )
-          .then(() => setNewParams({}))
-          .catch((e) => setPatchParamsError(String(e)));
+          .then(() => setChangedParams({}))
+          .catch((e) => setError(String(e)));
      }}
    >
      <label className="flex flex-col items-stretch gap-1">
        <span className="text-sm">
-          Negative prompt {newParams?.negative_prompt != null ? "(Changed)" : ""}
+          Negative prompt {changedParams?.negative_prompt != null ? "(Changed)" : ""}
        </span>
        <textarea
          className="input-text"
-          disabled={getParams.isLoading || !getUser.data?.admin}
-          value={newParams?.negative_prompt ??
-            getParams.data?.negative_prompt ??
+          disabled={params.isLoading || !user.data?.isAdmin}
+          value={changedParams?.negative_prompt ??
+            params.data?.negative_prompt ??
            ""}
          onChange={(e) =>
-            setNewParams((params) => ({
+            setChangedParams((params) => ({
              ...params,
              negative_prompt: e.target.value,
            }))}
        />
      </label>
-
      <label className="flex flex-col items-stretch gap-1">
        <span className="text-sm">
-          Sampler {newParams?.sampler_name != null ? "(Changed)" : ""}
+          Sampler {changedParams?.sampler_name != null ? "(Changed)" : ""}
        </span>
        <input
          className="input-text"
-          disabled={getParams.isLoading || !getUser.data?.admin}
-          value={newParams?.sampler_name ??
-            getParams.data?.sampler_name ??
+          disabled={params.isLoading || !user.data?.isAdmin}
+          value={changedParams?.sampler_name ??
+            params.data?.sampler_name ??
            ""}
          onChange={(e) =>
-            setNewParams((params) => ({
+            setChangedParams((params) => ({
              ...params,
              sampler_name: e.target.value,
            }))}
        />
      </label>
-
      <label className="flex flex-col items-stretch gap-1">
        <span className="text-sm">
-          Steps {newParams?.steps != null ? "(Changed)" : ""}
+          Steps {changedParams?.steps != null ? "(Changed)" : ""}
        </span>
        <span className="flex items-center gap-1">
          <input
@ -85,12 +82,12 @@ export function SettingsPage(props: { sessionId: string | null }) {
            min={5}
            max={50}
            step={5}
-            disabled={getParams.isLoading || !getUser.data?.admin}
-            value={newParams?.steps ??
-              getParams.data?.steps ??
+            disabled={params.isLoading || !user.data?.isAdmin}
+            value={changedParams?.steps ??
+              params.data?.steps ??
              0}
            onChange={(e) =>
-              setNewParams((params) => ({
+              setChangedParams((params) => ({
                ...params,
                steps: Number(e.target.value),
              }))}
@ -101,22 +98,21 @@ export function SettingsPage(props: { sessionId: string | null }) {
            min={5}
            max={50}
            step={5}
-            disabled={getParams.isLoading || !getUser.data?.admin}
-            value={newParams?.steps ??
-              getParams.data?.steps ??
+            disabled={params.isLoading || !user.data?.isAdmin}
+            value={changedParams?.steps ??
+              params.data?.steps ??
              0}
            onChange={(e) =>
-              setNewParams((params) => ({
+              setChangedParams((params) => ({
                ...params,
                steps: Number(e.target.value),
              }))}
          />
        </span>
      </label>
-
      <label className="flex flex-col items-stretch gap-1">
        <span className="text-sm">
-          Detail {newParams?.cfg_scale != null ? "(Changed)" : ""}
+          Detail {changedParams?.cfg_scale != null ? "(Changed)" : ""}
        </span>
        <span className="flex items-center gap-1">
          <input
@ -125,12 +121,12 @@ export function SettingsPage(props: { sessionId: string | null }) {
            min={1}
            max={20}
            step={1}
-            disabled={getParams.isLoading || !getUser.data?.admin}
-            value={newParams?.cfg_scale ??
-              getParams.data?.cfg_scale ??
+            disabled={params.isLoading || !user.data?.isAdmin}
+            value={changedParams?.cfg_scale ??
+              params.data?.cfg_scale ??
              0}
            onChange={(e) =>
-              setNewParams((params) => ({
+              setChangedParams((params) => ({
                ...params,
                cfg_scale: Number(e.target.value),
              }))}
@ -141,23 +137,22 @@ export function SettingsPage(props: { sessionId: string | null }) {
            min={1}
            max={20}
            step={1}
-            disabled={getParams.isLoading || !getUser.data?.admin}
-            value={newParams?.cfg_scale ??
-              getParams.data?.cfg_scale ??
+            disabled={params.isLoading || !user.data?.isAdmin}
+            value={changedParams?.cfg_scale ??
+              params.data?.cfg_scale ??
              0}
            onChange={(e) =>
-              setNewParams((params) => ({
+              setChangedParams((params) => ({
                ...params,
                cfg_scale: Number(e.target.value),
              }))}
          />
        </span>
      </label>
-
      <div className="flex gap-4">
        <label className="flex flex-1 flex-col items-stretch gap-1">
          <span className="text-sm">
-            Width {newParams?.width != null ? "(Changed)" : ""}
+            Width {changedParams?.width != null ? "(Changed)" : ""}
          </span>
          <input
            className="input-text"
@ -165,12 +160,12 @@ export function SettingsPage(props: { sessionId: string | null }) {
            min={64}
            max={2048}
            step={64}
-            disabled={getParams.isLoading || !getUser.data?.admin}
-            value={newParams?.width ??
-              getParams.data?.width ??
+            disabled={params.isLoading || !user.data?.isAdmin}
+            value={changedParams?.width ??
+              params.data?.width ??
              0}
            onChange={(e) =>
-              setNewParams((params) => ({
+              setChangedParams((params) => ({
                ...params,
                width: Number(e.target.value),
              }))}
@ -181,12 +176,12 @@ export function SettingsPage(props: { sessionId: string | null }) {
            min={64}
            max={2048}
            step={64}
-            disabled={getParams.isLoading || !getUser.data?.admin}
-            value={newParams?.width ??
-              getParams.data?.width ??
+            disabled={params.isLoading || !user.data?.isAdmin}
+            value={changedParams?.width ??
+              params.data?.width ??
              0}
            onChange={(e) =>
-              setNewParams((params) => ({
+              setChangedParams((params) => ({
                ...params,
                width: Number(e.target.value),
              }))}
@ -194,7 +189,7 @@ export function SettingsPage(props: { sessionId: string | null }) {
        </label>
        <label className="flex flex-1 flex-col items-stretch gap-1">
          <span className="text-sm">
-            Height {newParams?.height != null ? "(Changed)" : ""}
+            Height {changedParams?.height != null ? "(Changed)" : ""}
          </span>
          <input
            className="input-text"
@ -202,12 +197,12 @@ export function SettingsPage(props: { sessionId: string | null }) {
            min={64}
            max={2048}
            step={64}
-            disabled={getParams.isLoading || !getUser.data?.admin}
-            value={newParams?.height ??
-              getParams.data?.height ??
+            disabled={params.isLoading || !user.data?.isAdmin}
+            value={changedParams?.height ??
+              params.data?.height ??
              0}
            onChange={(e) =>
-              setNewParams((params) => ({
+              setChangedParams((params) => ({
                ...params,
                height: Number(e.target.value),
              }))}
@ -218,54 +213,35 @@ export function SettingsPage(props: { sessionId: string | null }) {
            min={64}
            max={2048}
            step={64}
-            disabled={getParams.isLoading || !getUser.data?.admin}
-            value={newParams?.height ??
-              getParams.data?.height ??
+            disabled={params.isLoading || !user.data?.isAdmin}
+            value={changedParams?.height ??
+              params.data?.height ??
              0}
            onChange={(e) =>
-              setNewParams((params) => ({
+              setChangedParams((params) => ({
                ...params,
                height: Number(e.target.value),
              }))}
          />
        </label>
      </div>
-
-      {patchParamsError
-        ? (
-          <p className="alert">
-            <span className="flex-grow">Updating params failed: {patchParamsError}</span>
-            <button className="button-ghost" onClick={() => setPatchParamsError(undefined)}>
-              Close
-            </button>
-          </p>
-        )
-        : null}
-      {getParams.error
-        ? (
-          <p className="alert">
-            <span className="flex-grow">
-              Loading params failed: {String(getParams.error)}
-            </span>
-          </p>
-        )
-        : null}
-
+      {error ? <Alert onClose={() => setError(undefined)}>{error}</Alert> : null}
+      {params.error ? <Alert>{params.error.message}</Alert> : null}
      <div className="flex gap-2 items-center justify-end">
        <button
          type="button"
-          className={cx("button-outlined ripple", getParams.isLoading && "bg-stripes")}
-          disabled={getParams.isLoading || !getUser.data?.admin ||
-            Object.keys(newParams ?? {}).length === 0}
-          onClick={() => setNewParams({})}
+          className={cx("button-outlined ripple", params.isLoading && "bg-stripes")}
+          disabled={params.isLoading || !user.data?.isAdmin ||
+            Object.keys(changedParams ?? {}).length === 0}
+          onClick={() => setChangedParams({})}
        >
          Reset
        </button>
        <button
          type="submit"
-          className={cx("button-filled ripple", getParams.isLoading && "bg-stripes")}
-          disabled={getParams.isLoading || !getUser.data?.admin ||
-            Object.keys(newParams ?? {}).length === 0}
+          className={cx("button-filled ripple", params.isLoading && "bg-stripes")}
+          disabled={params.isLoading || !user.data?.isAdmin ||
+            Object.keys(changedParams ?? {}).length === 0}
        >
          Save
        </button>
@ -273,3 +249,26 @@ export function SettingsPage(props: { sessionId: string | null }) {
    </form>
  );
 }
+
+function Alert(props: { children: ReactNode; onClose?: () => void }) {
+  const { children, onClose } = props;
+  return (
+    <p
+      role="alert"
+      className="px-4 py-2 flex gap-2 items-center bg-red-500 text-white rounded-sm shadow-md"
+    >
+      <span className="flex-grow">{children}</span>
+      {onClose
+        ? (
+          <button
+            type="button"
+            className="button-ghost"
+            onClick={() => onClose()}
+          >
+            Close
+          </button>
+        )
+        : null}
+    </p>
+  );
+}
--- a/ui/StatsPage.tsx
+++ b/ui/StatsPage.tsx
@ -1,10 +1,10 @@
 import React from "react";
-import { fetchApi, handleResponse } from "./apiClient.ts";
+import { fetchApi, handleResponse } from "./apiClient.tsx";
 import useSWR from "swr";
 import { Counter } from "./Counter.tsx";

 export function StatsPage() {
-  const getGlobalStats = useSWR(
+  const globalStats = useSWR(
    ["stats", "GET", {}] as const,
    (args) => fetchApi(...args).then(handleResponse),
    { refreshInterval: 2_000 },
@ -16,13 +16,13 @@ export function StatsPage() {
        <span>Pixelsteps diffused</span>
        <Counter
          className="font-bold text-zinc-700 dark:text-zinc-300"
-          value={getGlobalStats.data?.pixelStepCount ?? 0}
+          value={globalStats.data?.pixelStepCount ?? 0}
          digits={15}
          transitionDurationMs={3_000}
        />
        <Counter
          className="text-base"
-          value={(getGlobalStats.data?.pixelStepsPerMinute ?? 0) / 60}
+          value={(globalStats.data?.pixelStepsPerMinute ?? 0) / 60}
          digits={9}
          transitionDurationMs={2_000}
          postfix="/s"
@ -32,13 +32,13 @@ export function StatsPage() {
        <span>Pixels painted</span>
        <Counter
          className="font-bold text-zinc-700 dark:text-zinc-300"
-          value={getGlobalStats.data?.pixelCount ?? 0}
+          value={globalStats.data?.pixelCount ?? 0}
          digits={15}
          transitionDurationMs={3_000}
        />
        <Counter
          className="text-base"
-          value={(getGlobalStats.data?.pixelsPerMinute ?? 0) / 60}
+          value={(globalStats.data?.pixelsPerMinute ?? 0) / 60}
          digits={9}
          transitionDurationMs={2_000}
          postfix="/s"
@ -49,13 +49,13 @@ export function StatsPage() {
          <span>Steps processed</span>
          <Counter
            className="font-bold text-zinc-700 dark:text-zinc-300"
-            value={getGlobalStats.data?.stepCount ?? 0}
+            value={globalStats.data?.stepCount ?? 0}
            digits={9}
            transitionDurationMs={3_000}
          />
          <Counter
            className="text-base"
-            value={(getGlobalStats.data?.stepsPerMinute ?? 0) / 60}
+            value={(globalStats.data?.stepsPerMinute ?? 0) / 60}
            digits={3}
            fractionDigits={3}
            transitionDurationMs={2_000}
@ -66,13 +66,13 @@ export function StatsPage() {
          <span>Images generated</span>
          <Counter
            className="font-bold text-zinc-700 dark:text-zinc-300"
-            value={getGlobalStats.data?.imageCount ?? 0}
+            value={globalStats.data?.imageCount ?? 0}
            digits={9}
            transitionDurationMs={3_000}
          />
          <Counter
            className="text-base"
-            value={(getGlobalStats.data?.imagesPerMinute ?? 0) / 60}
+            value={(globalStats.data?.imagesPerMinute ?? 0) / 60}
            digits={3}
            fractionDigits={3}
            transitionDurationMs={2_000}
@ -84,7 +84,7 @@ export function StatsPage() {
        <span>Unique users</span>
        <Counter
          className="font-bold text-zinc-700 dark:text-zinc-300"
-          value={getGlobalStats.data?.userCount ?? 0}
+          value={globalStats.data?.userCount ?? 0}
          digits={6}
          transitionDurationMs={1_500}
        />
--- a/ui/WorkersPage.tsx
+++ b/ui/WorkersPage.tsx
@ -1,27 +1,27 @@
-import React, { RefObject, useRef, useState } from "react";
+import React, { useRef } from "react";
 import { FormattedRelativeTime } from "react-intl";
 import useSWR, { useSWRConfig } from "swr";
 import { WorkerData } from "../api/workersRoute.ts";
 import { Counter } from "./Counter.tsx";
-import { fetchApi, handleResponse } from "./apiClient.ts";
+import { fetchApi, handleResponse } from "./apiClient.tsx";

-export function WorkersPage(props: { sessionId: string | null }) {
+export function WorkersPage(props: { sessionId?: string }) {
  const { sessionId } = props;

-  const addDialogRef = useRef<HTMLDialogElement>(null);
+  const createWorkerModalRef = useRef<HTMLDialogElement>(null);

-  const getSession = useSWR(
+  const session = useSWR(
    sessionId ? ["sessions/{sessionId}", "GET", { params: { sessionId } }] as const : null,
    (args) => fetchApi(...args).then(handleResponse),
  );
-  const getUser = useSWR(
-    getSession.data?.userId
-      ? ["users/{userId}", "GET", { params: { userId: String(getSession.data.userId) } }] as const
+  const user = useSWR(
+    session.data?.userId
+      ? ["users/{userId}", "GET", { params: { userId: String(session.data.userId) } }] as const
      : null,
    (args) => fetchApi(...args).then(handleResponse),
  );

-  const getWorkers = useSWR(
+  const workers = useSWR(
    ["workers", "GET", {}] as const,
    (args) => fetchApi(...args).then(handleResponse),
    { refreshInterval: 5000 },
@ -29,47 +29,23 @@ export function WorkersPage(props: { sessionId: string | null }) {

  return (
    <>
-      {getWorkers.data?.length
-        ? (
      <ul className="my-4 flex flex-col gap-2">
-            {getWorkers.data?.map((worker) => (
+        {workers.data?.map((worker) => (
          <WorkerListItem key={worker.id} worker={worker} sessionId={sessionId} />
        ))}
      </ul>
-        )
-        : getWorkers.data?.length === 0
-        ? <p>No workers</p>
-        : getWorkers.error
-        ? <p className="alert">Loading workers failed</p>
-        : <div className="spinner self-center" />}
-
-      {getUser.data?.admin && (
+      {user.data?.isAdmin && (
        <button
          className="button-filled"
-          onClick={() => addDialogRef.current?.showModal()}
+          onClick={() => createWorkerModalRef.current?.showModal()}
        >
          Add worker
        </button>
      )}
-
-      <AddWorkerDialog
-        dialogRef={addDialogRef}
-        sessionId={sessionId}
-      />
-    </>
-  );
-}
-
-function AddWorkerDialog(props: {
-  dialogRef: RefObject<HTMLDialogElement>;
-  sessionId: string | null;
-}) {
-  const { dialogRef, sessionId } = props;
-
-  const { mutate } = useSWRConfig();
-
-  return (
-    <dialog ref={dialogRef} className="dialog animate-pop-in backdrop-animate-fade-in">
+      <dialog
+        className="dialog"
+        ref={createWorkerModalRef}
+      >
        <form
          method="dialog"
          className="flex flex-col gap-4 p-4"
@ -82,10 +58,8 @@ function AddWorkerDialog(props: {
            const user = data.get("user") as string;
            const password = data.get("password") as string;
            console.log(key, name, user, password);
-          mutate(
-            (key) => Array.isArray(key) && key[0] === "workers",
-            async () =>
-              fetchApi("workers", "POST", {
+            workers.mutate(async () => {
+              const worker = await fetchApi("workers", "POST", {
                query: { sessionId: sessionId! },
                body: {
                  type: "application/json",
@ -96,10 +70,11 @@ function AddWorkerDialog(props: {
                    sdAuth: user && password ? { user, password } : null,
                  },
                },
-              }).then(handleResponse),
-            { populateCache: false },
-          );
-          dialogRef.current?.close();
+              }).then(handleResponse);
+              return [...(workers.data ?? []), worker];
+            });
+
+            createWorkerModalRef.current?.close();
          }}
        >
          <div className="flex gap-4">
@ -170,7 +145,7 @@ function AddWorkerDialog(props: {
            <button
              type="button"
              className="button-outlined"
-            onClick={() => dialogRef.current?.close()}
+              onClick={() => createWorkerModalRef.current?.close()}
            >
              Close
            </button>
@ -180,28 +155,28 @@ function AddWorkerDialog(props: {
          </div>
        </form>
      </dialog>
+    </>
  );
 }

-function WorkerListItem(props: {
-  worker: WorkerData;
-  sessionId: string | null;
-}) {
+function WorkerListItem(props: { worker: WorkerData; sessionId?: string }) {
  const { worker, sessionId } = props;
-  const editDialogRef = useRef<HTMLDialogElement>(null);
-  const deleteDialogRef = useRef<HTMLDialogElement>(null);
+  const editWorkerModalRef = useRef<HTMLDialogElement>(null);
+  const deleteWorkerModalRef = useRef<HTMLDialogElement>(null);

-  const getSession = useSWR(
+  const session = useSWR(
    sessionId ? ["sessions/{sessionId}", "GET", { params: { sessionId } }] as const : null,
    (args) => fetchApi(...args).then(handleResponse),
  );
-  const getUser = useSWR(
-    getSession.data?.userId
-      ? ["users/{userId}", "GET", { params: { userId: String(getSession.data.userId) } }] as const
+  const user = useSWR(
+    session.data?.userId
+      ? ["users/{userId}", "GET", { params: { userId: String(session.data.userId) } }] as const
      : null,
    (args) => fetchApi(...args).then(handleResponse),
  );

+  const { mutate } = useSWRConfig();
+
  return (
    <li className="flex flex-col gap-2 rounded-md bg-zinc-100 dark:bg-zinc-800 p-2">
      <p className="font-bold">
@ -237,49 +212,27 @@ function WorkerListItem(props: {
        {" "}
        <Counter value={worker.stepsPerMinute} digits={3} /> steps per minute
      </p>
-      {getUser.data?.admin && (
      <p className="flex gap-2">
+        {user.data?.isAdmin && (
+          <>
            <button
              className="button-outlined"
-            onClick={() => editDialogRef.current?.showModal()}
+              onClick={() => editWorkerModalRef.current?.showModal()}
            >
              Settings
            </button>
            <button
              className="button-outlined"
-            onClick={() => deleteDialogRef.current?.showModal()}
+              onClick={() => deleteWorkerModalRef.current?.showModal()}
            >
              Delete
            </button>
-        </p>
+          </>
        )}
-      <EditWorkerDialog
-        dialogRef={editDialogRef}
-        workerId={worker.id}
-        sessionId={sessionId}
-      />
-      <DeleteWorkerDialog
-        dialogRef={deleteDialogRef}
-        workerId={worker.id}
-        sessionId={sessionId}
-      />
-    </li>
-  );
-}
-
-function EditWorkerDialog(props: {
-  dialogRef: RefObject<HTMLDialogElement>;
-  workerId: string;
-  sessionId: string | null;
-}) {
-  const { dialogRef, workerId, sessionId } = props;
-
-  const { mutate } = useSWRConfig();
-
-  return (
+      </p>
      <dialog
-      className="dialog animate-pop-in backdrop-animate-fade-in"
-      ref={dialogRef}
+        className="dialog"
+        ref={editWorkerModalRef}
      >
        <form
          method="dialog"
@ -290,22 +243,17 @@ function EditWorkerDialog(props: {
            const user = data.get("user") as string;
            const password = data.get("password") as string;
            console.log(user, password);
-          mutate(
-            (key) => Array.isArray(key) && key[0] === "workers",
-            async () =>
            fetchApi("workers/{workerId}", "PATCH", {
-                params: { workerId: workerId },
+              params: { workerId: worker.id },
              query: { sessionId: sessionId! },
              body: {
                type: "application/json",
                data: {
-                    sdAuth: user && password ? { user, password } : null,
+                  auth: user && password ? { user, password } : null,
                },
              },
-              }).then(handleResponse),
-            { populateCache: false },
-          );
-          dialogRef.current?.close();
+            });
+            editWorkerModalRef.current?.close();
          }}
        >
          <div className="flex gap-4">
@ -334,7 +282,7 @@ function EditWorkerDialog(props: {
            <button
              type="button"
              className="button-outlined"
-            onClick={() => dialogRef.current?.close()}
+              onClick={() => editWorkerModalRef.current?.close()}
            >
              Close
            </button>
@ -344,37 +292,20 @@ function EditWorkerDialog(props: {
          </div>
        </form>
      </dialog>
-  );
-}
-
-function DeleteWorkerDialog(props: {
-  dialogRef: RefObject<HTMLDialogElement>;
-  workerId: string;
-  sessionId: string | null;
-}) {
-  const { dialogRef, workerId, sessionId } = props;
-  const { mutate } = useSWRConfig();
-
-  return (
      <dialog
-      className="dialog animate-pop-in backdrop-animate-fade-in"
-      ref={dialogRef}
+        className="dialog"
+        ref={deleteWorkerModalRef}
      >
        <form
          method="dialog"
          className="flex flex-col gap-4 p-4"
          onSubmit={(e) => {
            e.preventDefault();
-          mutate(
-            (key) => Array.isArray(key) && key[0] === "workers",
-            async () =>
            fetchApi("workers/{workerId}", "DELETE", {
-                params: { workerId: workerId },
+              params: { workerId: worker.id },
              query: { sessionId: sessionId! },
-              }).then(handleResponse),
-            { populateCache: false },
-          );
-          dialogRef.current?.close();
+            }).then(handleResponse).then(() => mutate(["workers", "GET", {}]));
+            deleteWorkerModalRef.current?.close();
          }}
        >
          <p>
@ -384,7 +315,7 @@ function DeleteWorkerDialog(props: {
            <button
              type="button"
              className="button-outlined"
-            onClick={() => dialogRef.current?.close()}
+              onClick={() => deleteWorkerModalRef.current?.close()}
            >
              Close
            </button>
@ -394,5 +325,6 @@ function DeleteWorkerDialog(props: {
          </div>
        </form>
      </dialog>
+    </li>
  );
 }
--- a/ui/apiClient.tsx
+++ b/ui/apiClient.tsx
--- a/ui/robots.txt
+++ b/ui/robots.txt
@ -1,2 +0,0 @@
-User-agent: *
-Disallow: /
--- a/ui/twind.ts
+++ b/ui/twind.ts
@ -1,12 +1,11 @@
-import { defineConfig, injectGlobal, install } from "twind/core";
-import presetTailwind from "twind/preset-tailwind";
+import { defineConfig, injectGlobal, install } from "@twind/core";
+import presetTailwind from "@twind/preset-tailwind";

 const twConfig = defineConfig({
  presets: [presetTailwind()],
-  hash: false,
 });

-install(twConfig, false);
+install(twConfig);

 injectGlobal`
  @layer base {
@ -28,11 +27,14 @@ injectGlobal`
        rgba(0, 0, 0, 0.1) 14px,
        rgba(0, 0, 0, 0.1) 28px
      );
-      animation: bg-scroll 0.5s linear infinite;
+      animation: bg-stripes-scroll 0.5s linear infinite;
      background-size: 40px 40px;
    }
-    @keyframes bg-scroll {
-      to {
+    @keyframes bg-stripes-scroll {
+      0% {
+        background-position: 0 40px;
+      }
+      100% {
        background-position: 40px 0;
      }
    }
@ -61,11 +63,11 @@ injectGlobal`
        opacity 0s;
    }

-    .backdrop-animate-fade-in::backdrop {
+    .animate-fade-in {
      animation: fade-in 0.3s ease-out forwards;
    }
    @keyframes fade-in {
-      from {
+      0% {
        opacity: 0;
      }
    }
@ -74,7 +76,7 @@ injectGlobal`
      animation: pop-in 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
    }
    @keyframes pop-in {
-      from {
+      0% {
        transform: scale(0.8);
        opacity: 0;
      }
@ -90,10 +92,6 @@ injectGlobal`
      @apply h-8 w-8 animate-spin rounded-full border-4 border-transparent border-t-current;
    }

-    .alert {
-      @apply px-4 py-2 flex gap-2 items-center bg-red-500 text-white rounded-sm shadow-md;
-    }
-
    .button-filled {
      @apply rounded-md bg-sky-600 px-3 py-2 min-h-12
        text-sm font-semibold uppercase tracking-wider text-white shadow-sm transition-all 
@ -116,7 +114,7 @@ injectGlobal`
    }

    .tab {
-      @apply inline-flex items-center px-4 text-sm text-center bg-transparent border-b-2 sm:text-base whitespace-nowrap outline-none
+      @apply inline-flex items-center px-4 text-sm text-center bg-transparent border-b-2 sm:text-base whitespace-nowrap focus:outline-none
        border-transparent dark:text-white cursor-base hover:border-zinc-400 focus:border-zinc-400 transition-all;
    }

@ -136,8 +134,8 @@ injectGlobal`
    }

    .dialog {
-      @apply overflow-hidden overflow-y-auto rounded-md shadow-xl
-        bg-white text-zinc-900 shadow-lg backdrop:bg-black/30 dark:bg-zinc-800 dark:text-zinc-100;
+      @apply animate-pop-in backdrop:animate-fade-in overflow-hidden overflow-y-auto rounded-md 
+        bg-zinc-100 text-zinc-900 shadow-lg backdrop:bg-black/20 dark:bg-zinc-800 dark:text-zinc-100;
    }
  }
 `;
--- a/ui/useLocalStorage.ts
+++ b/ui/useLocalStorage.ts
@ -1,31 +0,0 @@
-import { useEffect, useState } from "react";
-
-export function useLocalStorage(key: string) {
-  const [value, setValue] = useState(() => window.localStorage.getItem(key));
-
-  useEffect(() => {
-    console.log(key, value);
-    if (value != null) {
-      window.localStorage.setItem(key, value);
-    } else {
-      window.localStorage.removeItem(key);
-    }
-  }, [key, value]);
-
-  useEffect(() => {
-    const handleStorage = (event: StorageEvent) => {
-      if (event.key === key) {
-        console.log(key, event.newValue);
-        setValue(event.newValue);
-      }
-    };
-
-    window.addEventListener("storage", handleStorage);
-
-    return () => {
-      window.removeEventListener("storage", handleStorage);
-    };
-  }, [key]);
-
-  return [value, setValue] as const;
-}
--- a/utils/formatUserChat.ts
+++ b/utils/formatUserChat.ts
@ -1,11 +1,7 @@
 import { Chat, User } from "grammy_types";

 export function formatUserChat(
-  ctx: {
-    from?: User | undefined;
-    chat?: Chat | undefined;
-    workerInstanceKey?: string | undefined;
-  },
+  ctx: { from?: User; chat?: Chat; workerInstanceKey?: string },
 ) {
  const msg: string[] = [];
  if (ctx.from) {
--- a/utils/omitUndef.ts
+++ b/utils/omitUndef.ts
@ -1,11 +0,0 @@
-/**
- * Removes all undefined properties from an object.
- */
-export function omitUndef<O extends object | undefined>(object: O):
-  & { [K in keyof O as undefined extends O[K] ? never : K]: O[K] }
-  & { [K in keyof O as undefined extends O[K] ? K : never]?: O[K] & ({} | null) } {
-  if (object == undefined) return object as never;
-  return Object.fromEntries(
-    Object.entries(object).filter(([, v]) => v !== undefined),
-  ) as never;
-}