diff --git a/packages/ditto/app.ts b/packages/ditto/app.ts
index 5f3a12e4..44b0b9b4 100644
--- a/packages/ditto/app.ts
+++ b/packages/ditto/app.ts
@@ -1,5 +1,5 @@
 import { DittoConf } from '@ditto/conf';
-import { DittoDB, DittoPolyPg } from '@ditto/db';
+import { DittoPolyPg } from '@ditto/db';
 import { paginationMiddleware, tokenMiddleware, userMiddleware } from '@ditto/mastoapi/middleware';
 import { DittoApp, type DittoEnv } from '@ditto/mastoapi/router';
 import { relayPoolRelaysSizeGauge, relayPoolSubscriptionsSizeGauge } from '@ditto/metrics';
@@ -152,21 +152,15 @@ import { logiMiddleware } from '@/middleware/logiMiddleware.ts';
 import { DittoRelayStore } from '@/storages/DittoRelayStore.ts';
 
 export interface AppEnv extends DittoEnv {
-  Variables: {
-    conf: DittoConf;
+  Variables: DittoEnv['Variables'] & {
     /** Uploader for the user to upload files. */
     uploader?: NUploader;
     /** NIP-98 signed event proving the pubkey is owned by the user. */
     proof?: NostrEvent;
-    /** Kysely instance for the database. */
-    db: DittoDB;
-    /** Base database store. No content filtering. */
-    relay: NRelay;
     /** Normalized pagination params. */
     pagination: { since?: number; until?: number; limit: number };
     /** Translation service. */
     translator?: DittoTranslator;
-    signal: AbortSignal;
     user?: {
       /** Signer to get the logged-in user's pubkey, relays, and to sign events, or `undefined` if the user isn't logged in. */
       signer: NostrSigner;
diff --git a/packages/ditto/controllers/api/admin.ts b/packages/ditto/controllers/api/admin.ts
index f3611035..124e0f88 100644
--- a/packages/ditto/controllers/api/admin.ts
+++ b/packages/ditto/controllers/api/admin.ts
@@ -128,7 +128,7 @@ const adminAccountActionSchema = z.object({
 });
 
 const adminActionController: AppController = async (c) => {
-  const { conf, relay } = c.var;
+  const { conf, relay, requestId } = c.var;
 
   const body = await parseBody(c.req.raw);
   const result = adminAccountActionSchema.safeParse(body);
@@ -155,7 +155,7 @@ const adminActionController: AppController = async (c) => {
     n.disabled = true;
     n.suspended = true;
     relay.remove!([{ authors: [authorId] }]).catch((e: unknown) => {
-      logi({ level: 'error', ns: 'ditto.api.admin.account.action', type: data.type, error: errorJson(e) });
+      logi({ level: 'error', ns: 'ditto.api.admin.account.action', type: data.type, requestId, error: errorJson(e) });
     });
   }
   if (data.type === 'revoke_name') {
@@ -163,7 +163,7 @@ const adminActionController: AppController = async (c) => {
     try {
       await relay.remove!([{ kinds: [30360], authors: [await conf.signer.getPublicKey()], '#p': [authorId] }]);
     } catch (e) {
-      logi({ level: 'error', ns: 'ditto.api.admin.account.action', type: data.type, error: errorJson(e) });
+      logi({ level: 'error', ns: 'ditto.api.admin.account.action', type: data.type, requestId, error: errorJson(e) });
       return c.json({ error: 'Unexpected runtime error' }, 500);
     }
   }
diff --git a/packages/ditto/controllers/api/cashu.ts b/packages/ditto/controllers/api/cashu.ts
index 4546dda3..1989a569 100644
--- a/packages/ditto/controllers/api/cashu.ts
+++ b/packages/ditto/controllers/api/cashu.ts
@@ -103,7 +103,7 @@ route.put('/wallet', userMiddleware({ enc: 'nip44' }), async (c) => {
 
 /** Gets a wallet, if it exists. */
 route.get('/wallet', userMiddleware({ enc: 'nip44' }), swapNutzapsMiddleware, async (c) => {
-  const { conf, relay, user, signal } = c.var;
+  const { conf, relay, user, signal, requestId } = c.var;
 
   const pubkey = await user.signer.getPublicKey();
 
@@ -139,7 +139,7 @@ route.get('/wallet', userMiddleware({ enc: 'nip44' }), swapNutzapsMiddleware, as
         return accumulator + current.amount;
       }, 0);
     } catch (e) {
-      logi({ level: 'error', ns: 'ditto.api.cashu.wallet.swap', error: errorJson(e) });
+      logi({ level: 'error', ns: 'ditto.api.cashu.wallet.swap', requestId, error: errorJson(e) });
     }
   }
 
diff --git a/packages/ditto/controllers/api/media.ts b/packages/ditto/controllers/api/media.ts
index c6c6b062..65660e99 100644
--- a/packages/ditto/controllers/api/media.ts
+++ b/packages/ditto/controllers/api/media.ts
@@ -21,7 +21,7 @@ const mediaUpdateSchema = z.object({
 });
 
 const mediaController: AppController = async (c) => {
-  const { user, signal } = c.var;
+  const { user, signal, requestId } = c.var;
 
   const pubkey = await user!.signer.getPublicKey();
   const result = mediaBodySchema.safeParse(await parseBody(c.req.raw));
@@ -35,7 +35,7 @@ const mediaController: AppController = async (c) => {
     const media = await uploadFile(c, file, { pubkey, description }, signal);
     return c.json(renderAttachment(media));
   } catch (e) {
-    logi({ level: 'error', ns: 'ditto.api.media', error: errorJson(e) });
+    logi({ level: 'error', ns: 'ditto.api.media', requestId, error: errorJson(e) });
     return c.json({ error: 'Failed to upload file.' }, 500);
   }
 };
diff --git a/packages/ditto/controllers/api/streaming.ts b/packages/ditto/controllers/api/streaming.ts
index e6924641..4eebe6b3 100644
--- a/packages/ditto/controllers/api/streaming.ts
+++ b/packages/ditto/controllers/api/streaming.ts
@@ -65,7 +65,8 @@ const limiter = new TTLCache<string, number>();
 const connections = new Set<WebSocket>();
 
 const streamingController: AppController = async (c) => {
-  const { conf, relay, user } = c.var;
+  const { conf, relay, user, requestId } = c.var;
+
   const upgrade = c.req.header('upgrade');
   const token = c.req.header('sec-websocket-protocol');
   const stream = streamSchema.optional().catch(undefined).parse(c.req.query('stream'));
@@ -122,7 +123,7 @@ const streamingController: AppController = async (c) => {
         }
       }
     } catch (e) {
-      logi({ level: 'error', ns: 'ditto.streaming', msg: 'Error in streaming', error: errorJson(e) });
+      logi({ level: 'error', ns: 'ditto.streaming', msg: 'Error in streaming', requestId, error: errorJson(e) });
     }
   }
 
diff --git a/packages/ditto/controllers/api/translate.ts b/packages/ditto/controllers/api/translate.ts
index 65a95a26..ac62ddbe 100644
--- a/packages/ditto/controllers/api/translate.ts
+++ b/packages/ditto/controllers/api/translate.ts
@@ -17,7 +17,7 @@ const translateSchema = z.object({
 });
 
 const translateController: AppController = async (c) => {
-  const { relay, user, signal } = c.var;
+  const { relay, user, signal, requestId } = c.var;
 
   const result = translateSchema.safeParse(await parseBody(c.req.raw));
 
@@ -143,7 +143,7 @@ const translateController: AppController = async (c) => {
     if (e instanceof Error && e.message.includes('not supported')) {
       return c.json({ error: `Translation of source language '${event.language}' not supported` }, 422);
     }
-    logi({ level: 'error', ns: 'ditto.translate', error: errorJson(e) });
+    logi({ level: 'error', ns: 'ditto.translate', requestId, error: errorJson(e) });
     return c.json({ error: 'Service Unavailable' }, 503);
   }
 };
diff --git a/packages/ditto/controllers/error.ts b/packages/ditto/controllers/error.ts
index a00a530b..42c2088f 100644
--- a/packages/ditto/controllers/error.ts
+++ b/packages/ditto/controllers/error.ts
@@ -4,7 +4,10 @@ import { logi } from '@soapbox/logi';
 
 import { errorJson } from '@/utils/log.ts';
 
-export const errorHandler: ErrorHandler = (err, c) => {
+import type { DittoEnv } from '@ditto/mastoapi/router';
+
+export const errorHandler: ErrorHandler<DittoEnv> = (err, c) => {
+  const { requestId } = c.var;
   const { method } = c.req;
   const { pathname } = new URL(c.req.url);
 
@@ -22,7 +25,15 @@ export const errorHandler: ErrorHandler = (err, c) => {
     return c.json({ error: 'The server was unable to respond in a timely manner' }, 500);
   }
 
-  logi({ level: 'error', ns: 'ditto.http', msg: 'Unhandled error', method, pathname, error: errorJson(err) });
+  logi({
+    level: 'error',
+    ns: 'ditto.http',
+    msg: 'Unhandled error',
+    method,
+    pathname,
+    requestId,
+    error: errorJson(err),
+  });
 
   return c.json({ error: 'Something went wrong' }, 500);
 };
diff --git a/packages/ditto/controllers/frontend.ts b/packages/ditto/controllers/frontend.ts
index c0a6848f..bd2b4de3 100644
--- a/packages/ditto/controllers/frontend.ts
+++ b/packages/ditto/controllers/frontend.ts
@@ -14,6 +14,8 @@ import { renderAccount } from '@/views/mastodon/accounts.ts';
 const META_PLACEHOLDER = '<!--server-generated-meta-->' as const;
 
 export const frontendController: AppMiddleware = async (c) => {
+  const { requestId } = c.var;
+
   c.header('Cache-Control', 'max-age=86400, s-maxage=30, public, stale-if-error=604800');
 
   try {
@@ -26,7 +28,7 @@ export const frontendController: AppMiddleware = async (c) => {
         const meta = renderMetadata(c.req.url, entities);
         return c.html(content.replace(META_PLACEHOLDER, meta));
       } catch (e) {
-        logi({ level: 'error', ns: 'ditto.frontend', msg: 'Error building meta tags', error: errorJson(e) });
+        logi({ level: 'error', ns: 'ditto.frontend', msg: 'Error building meta tags', requestId, error: errorJson(e) });
         return c.html(content);
       }
     }
diff --git a/packages/ditto/controllers/nostr/relay.ts b/packages/ditto/controllers/nostr/relay.ts
index f6641549..dea341e3 100644
--- a/packages/ditto/controllers/nostr/relay.ts
+++ b/packages/ditto/controllers/nostr/relay.ts
@@ -11,6 +11,7 @@ import {
   NostrClientMsg,
   NostrClientREQ,
   NostrRelayMsg,
+  NRelay,
   NSchema as n,
 } from '@nostrify/nostrify';
 
@@ -40,8 +41,17 @@ const limiters = {
 /** Connections for metrics purposes. */
 const connections = new Set<WebSocket>();
 
+interface ConnectStreamOpts {
+  conf: DittoConf;
+  relay: NRelay;
+  requestId: string;
+}
+
 /** Set up the Websocket connection. */
-function connectStream(conf: DittoConf, relay: DittoPgStore, socket: WebSocket, ip: string | undefined) {
+function connectStream(socket: WebSocket, ip: string | undefined, opts: ConnectStreamOpts): void {
+  const { conf, requestId } = opts;
+  const relay = opts.relay as DittoPgStore;
+
   const controllers = new Map<string, AbortController>();
 
   if (ip) {
@@ -74,7 +84,7 @@ function connectStream(conf: DittoConf, relay: DittoPgStore, socket: WebSocket,
       const msg = result.data;
       const verb = msg[0];
 
-      logi({ level: 'trace', ns: 'ditto.relay.msg', verb, msg: msg as JsonValue, ip });
+      logi({ level: 'trace', ns: 'ditto.relay.msg', verb, msg: msg as JsonValue, ip, requestId });
       relayMessagesCounter.inc({ verb });
 
       handleMsg(result.data);
@@ -165,7 +175,7 @@ function connectStream(conf: DittoConf, relay: DittoPgStore, socket: WebSocket,
         send(['OK', event.id, false, e.message]);
       } else {
         send(['OK', event.id, false, 'error: something went wrong']);
-        logi({ level: 'error', ns: 'ditto.relay', msg: 'Error in relay', error: errorJson(e), ip });
+        logi({ level: 'error', ns: 'ditto.relay', msg: 'Error in relay', error: errorJson(e), ip, requestId });
       }
     }
   }
@@ -195,7 +205,8 @@ function connectStream(conf: DittoConf, relay: DittoPgStore, socket: WebSocket,
 }
 
 const relayController: AppController = (c, next) => {
-  const { conf, relay } = c.var;
+  const { conf } = c.var;
+
   const upgrade = c.req.header('upgrade');
 
   // NIP-11: https://github.com/nostr-protocol/nips/blob/master/11.md
@@ -214,7 +225,7 @@ const relayController: AppController = (c, next) => {
   }
 
   const { socket, response } = Deno.upgradeWebSocket(c.req.raw);
-  connectStream(conf, relay as DittoPgStore, socket, ip);
+  connectStream(socket, ip, c.var);
 
   return response;
 };
diff --git a/packages/ditto/middleware/logiMiddleware.ts b/packages/ditto/middleware/logiMiddleware.ts
index be17e3bb..7db2fa87 100644
--- a/packages/ditto/middleware/logiMiddleware.ts
+++ b/packages/ditto/middleware/logiMiddleware.ts
@@ -1,11 +1,13 @@
-import { MiddlewareHandler } from '@hono/hono';
 import { logi } from '@soapbox/logi';
 
-export const logiMiddleware: MiddlewareHandler = async (c, next) => {
+import type { DittoMiddleware } from '@ditto/mastoapi/router';
+
+export const logiMiddleware: DittoMiddleware = async (c, next) => {
+  const { requestId } = c.var;
   const { method } = c.req;
   const { pathname } = new URL(c.req.url);
 
-  logi({ level: 'info', ns: 'ditto.http.request', method, pathname });
+  logi({ level: 'info', ns: 'ditto.http.request', method, pathname, requestId });
 
   const start = new Date();
 
@@ -15,5 +17,5 @@ export const logiMiddleware: MiddlewareHandler = async (c, next) => {
   const duration = (end.getTime() - start.getTime()) / 1000;
   const level = c.res.status >= 500 ? 'error' : 'info';
 
-  logi({ level, ns: 'ditto.http.response', method, pathname, status: c.res.status, duration });
+  logi({ level, ns: 'ditto.http.response', method, pathname, status: c.res.status, duration, requestId });
 };
diff --git a/packages/mastoapi/router/DittoApp.ts b/packages/mastoapi/router/DittoApp.ts
index 2d3c0107..f16ca61e 100644
--- a/packages/mastoapi/router/DittoApp.ts
+++ b/packages/mastoapi/router/DittoApp.ts
@@ -7,7 +7,7 @@ export class DittoApp extends Hono<DittoEnv> {
   // @ts-ignore Require a DittoRoute for type safety.
   declare route: (path: string, app: Hono<DittoEnv>) => Hono<DittoEnv>;
 
-  constructor(opts: Omit<DittoEnv['Variables'], 'signal'> & HonoOptions<DittoEnv>) {
+  constructor(opts: Omit<DittoEnv['Variables'], 'signal' | 'requestId'> & HonoOptions<DittoEnv>) {
     super(opts);
 
     this.use((c, next) => {
@@ -15,6 +15,7 @@ export class DittoApp extends Hono<DittoEnv> {
       c.set('conf', opts.conf);
       c.set('relay', opts.relay);
       c.set('signal', c.req.raw.signal);
+      c.set('requestId', c.req.header('X-Request-Id') ?? crypto.randomUUID());
       return next();
     });
   }
diff --git a/packages/mastoapi/router/DittoEnv.ts b/packages/mastoapi/router/DittoEnv.ts
index 7f399e62..35fb0118 100644
--- a/packages/mastoapi/router/DittoEnv.ts
+++ b/packages/mastoapi/router/DittoEnv.ts
@@ -16,5 +16,7 @@ export interface DittoEnv extends Env {
     db: DittoDB;
     /** Abort signal for the request. */
     signal: AbortSignal;
+    /** Unique ID for the request. */
+    requestId: string;
   };
 }
diff --git a/packages/mastoapi/router/DittoMiddleware.ts b/packages/mastoapi/router/DittoMiddleware.ts
index 1483ca90..91afd533 100644
--- a/packages/mastoapi/router/DittoMiddleware.ts
+++ b/packages/mastoapi/router/DittoMiddleware.ts
@@ -2,4 +2,4 @@ import type { MiddlewareHandler } from '@hono/hono';
 import type { DittoEnv } from './DittoEnv.ts';
 
 // deno-lint-ignore ban-types
-export type DittoMiddleware<T extends {}> = MiddlewareHandler<DittoEnv & { Variables: T }>;
+export type DittoMiddleware<T extends {} = {}> = MiddlewareHandler<DittoEnv & { Variables: T }>;
diff --git a/packages/mastoapi/router/DittoRoute.ts b/packages/mastoapi/router/DittoRoute.ts
index 369fb858..53d2109b 100644
--- a/packages/mastoapi/router/DittoRoute.ts
+++ b/packages/mastoapi/router/DittoRoute.ts
@@ -25,6 +25,7 @@ export class DittoRoute extends Hono<DittoEnv> {
     if (!vars.conf) this.throwMissingVar('conf');
     if (!vars.relay) this.throwMissingVar('relay');
     if (!vars.signal) this.throwMissingVar('signal');
+    if (!vars.requestId) this.throwMissingVar('requestId');
 
     return {
       ...vars,
@@ -32,6 +33,7 @@ export class DittoRoute extends Hono<DittoEnv> {
       conf: vars.conf,
       relay: vars.relay,
       signal: vars.signal,
+      requestId: vars.requestId,
     };
   }