diff --git a/.config/example.yml b/.config/example.yml
index 02661b7fbf..b7b56f2287 100644
--- a/.config/example.yml
+++ b/.config/example.yml
@@ -72,6 +72,16 @@ redis:
 #  user: 
 #  pass: 
 
+#   ┌─────────────────────┐
+#───┘ Sonic configuration └─────────────────────────────────────
+
+#sonic:
+#  host: localhost
+#  port: 1491
+#  auth: SecretPassword
+#  collection: notes
+#  bucket: default
+
 #   ┌───────────────┐
 #───┘ ID generation └───────────────────────────────────────────
 
diff --git a/.gitignore b/.gitignore
index 52139614c2..5e1d4a26d0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -44,6 +44,7 @@ ormconfig.json
 packages/backend/assets/instance.css
 packages/backend/assets/sounds/None.mp3
 
+!packages/backend/src/db
 
 # blender backups
 *.blend1
diff --git a/packages/backend/package.json b/packages/backend/package.json
index ce6efde9c2..e7bec1a220 100644
--- a/packages/backend/package.json
+++ b/packages/backend/package.json
@@ -112,6 +112,7 @@
 		"seedrandom": "^3.0.5",
 		"semver": "7.3.8",
 		"sharp": "0.31.3",
+		"sonic-channel": "^1.3.1",
 		"speakeasy": "2.0.0",
 		"stringz": "2.1.0",
 		"summaly": "2.7.0",
diff --git a/packages/backend/src/config/types.ts b/packages/backend/src/config/types.ts
index ed9b0ece08..a7cdc89cf2 100644
--- a/packages/backend/src/config/types.ts
+++ b/packages/backend/src/config/types.ts
@@ -32,6 +32,13 @@ export type Source = {
 		pass?: string;
 		index?: string;
 	};
+	sonic: {
+		host: string;
+		port: number;
+		auth?: string;
+		collection?: string;
+		bucket?: string;
+	};
 
 	proxy?: string;
 	proxySmtp?: string;
diff --git a/packages/backend/src/db/sonic.ts b/packages/backend/src/db/sonic.ts
new file mode 100644
index 0000000000..6c4d28f703
--- /dev/null
+++ b/packages/backend/src/db/sonic.ts
@@ -0,0 +1,51 @@
+import * as SonicChannel from "sonic-channel";
+import { dbLogger } from "./logger.js";
+
+import config from "@/config/index.js";
+
+const logger = dbLogger.createSubLogger("sonic", "gray", false);
+
+logger.info("Connecting to Sonic");
+
+const handlers = (type: string): SonicChannel.Handlers => (
+	{
+		connected: () => {
+			logger.succ(`Connected to Sonic ${type}`);
+		},
+		disconnected: (error) => {
+			logger.warn(`Disconnected from Sonic ${type}, error: ${error}`);
+		},
+		error: (error) => {
+			logger.warn(`Sonic ${type} error: ${error}`);
+		},
+		retrying: () => {
+			logger.info(`Sonic ${type} retrying`);
+		},
+		timeout: () => {
+			logger.warn(`Sonic ${type} timeout`);
+		},
+	}
+)
+
+const hasConfig =
+	config.sonic
+	&& ( config.sonic.host
+		|| config.sonic.port
+		|| config.sonic.auth
+	)
+
+const host = hasConfig ? config.sonic.host ?? "localhost" : "";
+const port = hasConfig ? config.sonic.port ?? 1491 : 0;
+const auth = hasConfig ? config.sonic.auth ?? "SecretPassword" : "";
+const collection = hasConfig ? config.sonic.collection ?? "main" : "";
+const bucket = hasConfig ? config.sonic.bucket ?? "default" : "";
+
+export default hasConfig
+	? {
+			search: new SonicChannel.Search({host, port, auth}).connect(handlers("search")),
+			ingest: new SonicChannel.Ingest({host, port, auth}).connect(handlers("ingest")),
+
+			collection,
+			bucket,
+		}
+	: null;
diff --git a/packages/backend/src/queue/index.ts b/packages/backend/src/queue/index.ts
index c40b3c6aeb..c387efe927 100644
--- a/packages/backend/src/queue/index.ts
+++ b/packages/backend/src/queue/index.ts
@@ -13,6 +13,7 @@ import processDb from "./processors/db/index.js";
 import processObjectStorage from "./processors/object-storage/index.js";
 import processSystemQueue from "./processors/system/index.js";
 import processWebhookDeliver from "./processors/webhook-deliver.js";
+import processBackground from "./processors/background/index.js";
 import { endedPollNotification } from "./processors/ended-poll-notification.js";
 import { queueLogger } from "./logger.js";
 import { getJobInfo } from "./get-job-info.js";
@@ -24,6 +25,7 @@ import {
 	objectStorageQueue,
 	endedPollNotificationQueue,
 	webhookDeliverQueue,
+	backgroundQueue,
 } from "./queues.js";
 import type { ThinUser } from "./types.js";
 
@@ -418,6 +420,17 @@ export function createCleanRemoteFilesJob() {
 	);
 }
 
+export function createIndexAllNotesJob(data = {}) {
+	return backgroundQueue.add(
+		"indexAllNotes",
+		data,
+		{
+			removeOnComplete: true,
+			removeOnFail: true,
+		},
+	);
+}
+
 export function webhookDeliver(
 	webhook: Webhook,
 	type: typeof webhookEventTypes[number],
@@ -454,6 +467,7 @@ export default function () {
 	webhookDeliverQueue.process(64, processWebhookDeliver);
 	processDb(dbQueue);
 	processObjectStorage(objectStorageQueue);
+	processBackground(backgroundQueue);
 
 	systemQueue.add(
 		"tickCharts",
diff --git a/packages/backend/src/queue/processors/background/index-all-notes.ts b/packages/backend/src/queue/processors/background/index-all-notes.ts
new file mode 100644
index 0000000000..f032758864
--- /dev/null
+++ b/packages/backend/src/queue/processors/background/index-all-notes.ts
@@ -0,0 +1,76 @@
+import type Bull from "bull";
+
+import { queueLogger } from "../../logger.js";
+import { Notes } from "@/models/index.js";
+import { MoreThan } from "typeorm";
+import { index } from "@/services/note/create.js"
+import { Note } from "@/models/entities/note.js";
+
+const logger = queueLogger.createSubLogger("index-all-notes");
+
+export default async function indexAllNotes(
+	job: Bull.Job<Record<string, unknown>>,
+	done: ()=>void,
+): Promise<void> {
+	logger.info("Indexing all notes...");
+
+	let cursor: string|null = job.data.cursor as string ?? null;
+	let indexedCount: number = job.data.indexedCount as number ?? 0;
+	let total: number = job.data.total as number ?? 0;
+
+	let running = true;
+	const take = 50000;
+	const batch = 100;
+	while (running) {
+		logger.info(`Querying for ${take} notes ${indexedCount}/${total ? total : '?'} at ${cursor}`);
+
+		let notes: Note[] = [];
+		try {
+			notes = await Notes.find({
+				where: {
+					...(cursor ? { id: MoreThan(cursor) } : {}),
+				},
+				take: take,
+				order: {
+					id: 1,
+				},
+			});
+		} catch (e) {
+			logger.error(`Failed to query notes ${e}`);
+			continue;
+		}
+
+		if (notes.length === 0) {
+			job.progress(100);
+			running = false;
+			break;
+		}
+
+		try {
+			const count = await Notes.count();
+			total = count;
+			job.update({ indexedCount, cursor, total })
+		} catch (e) {
+		}
+
+		for (let i = 0; i < notes.length; i += batch) {
+			const chunk = notes.slice(i, i + batch);
+			await Promise.all(chunk.map(note => index(note)));
+
+			indexedCount += chunk.length;
+			const pct = (indexedCount / total)*100;
+			job.update({ indexedCount, cursor, total })
+			job.progress(+(pct.toFixed(1)));
+			logger.info(`Indexed notes ${indexedCount}/${total ? total : '?'}`);
+		}
+		cursor = notes[notes.length - 1].id;
+		job.update({ indexedCount, cursor, total })
+
+		if (notes.length < take) {
+			running = false;
+		}
+	}
+
+	done();
+	logger.info("All notes have been indexed.");
+}
diff --git a/packages/backend/src/queue/processors/background/index.ts b/packages/backend/src/queue/processors/background/index.ts
new file mode 100644
index 0000000000..cf96b67ef6
--- /dev/null
+++ b/packages/backend/src/queue/processors/background/index.ts
@@ -0,0 +1,15 @@
+import type Bull from "bull";
+import indexAllNotes from "./index-all-notes.js";
+
+const jobs = {
+	indexAllNotes,
+} as Record<
+	string,
+	Bull.ProcessCallbackFunction<Record<string, unknown>>
+>;
+
+export default function (q: Bull.Queue) {
+	for (const [k, v] of Object.entries(jobs)) {
+		q.process(k, 16, v);
+	}
+}
diff --git a/packages/backend/src/queue/queues.ts b/packages/backend/src/queue/queues.ts
index 12d9d66207..6d7fffcb30 100644
--- a/packages/backend/src/queue/queues.ts
+++ b/packages/backend/src/queue/queues.ts
@@ -27,6 +27,7 @@ export const webhookDeliverQueue = initializeQueue<WebhookDeliverJobData>(
 	"webhookDeliver",
 	64,
 );
+export const backgroundQueue = initializeQueue<Record<string, unknown>>("bg");
 
 export const queues = [
 	systemQueue,
@@ -36,4 +37,5 @@ export const queues = [
 	dbQueue,
 	objectStorageQueue,
 	webhookDeliverQueue,
+	backgroundQueue,
 ];
diff --git a/packages/backend/src/server/api/endpoints.ts b/packages/backend/src/server/api/endpoints.ts
index bfafbaa62e..ba0e721b9e 100644
--- a/packages/backend/src/server/api/endpoints.ts
+++ b/packages/backend/src/server/api/endpoints.ts
@@ -51,6 +51,7 @@ import * as ep___admin_relays_list from "./endpoints/admin/relays/list.js";
 import * as ep___admin_relays_remove from "./endpoints/admin/relays/remove.js";
 import * as ep___admin_resetPassword from "./endpoints/admin/reset-password.js";
 import * as ep___admin_resolveAbuseUserReport from "./endpoints/admin/resolve-abuse-user-report.js";
+import * as ep___admin_search_indexAll from "./endpoints/admin/search/index-all.js";
 import * as ep___admin_sendEmail from "./endpoints/admin/send-email.js";
 import * as ep___admin_serverInfo from "./endpoints/admin/server-info.js";
 import * as ep___admin_showModerationLogs from "./endpoints/admin/show-moderation-logs.js";
@@ -393,6 +394,7 @@ const eps = [
 	["admin/relays/remove", ep___admin_relays_remove],
 	["admin/reset-password", ep___admin_resetPassword],
 	["admin/resolve-abuse-user-report", ep___admin_resolveAbuseUserReport],
+	["admin/search/index-all", ep___admin_search_indexAll],
 	["admin/send-email", ep___admin_sendEmail],
 	["admin/server-info", ep___admin_serverInfo],
 	["admin/show-moderation-logs", ep___admin_showModerationLogs],
diff --git a/packages/backend/src/server/api/endpoints/admin/queue/stats.ts b/packages/backend/src/server/api/endpoints/admin/queue/stats.ts
index ecd67d8936..4a437c3d12 100644
--- a/packages/backend/src/server/api/endpoints/admin/queue/stats.ts
+++ b/packages/backend/src/server/api/endpoints/admin/queue/stats.ts
@@ -3,6 +3,7 @@ import {
 	inboxQueue,
 	dbQueue,
 	objectStorageQueue,
+	backgroundQueue,
 } from "@/queue/queues.js";
 import define from "../../../define.js";
 
@@ -37,6 +38,11 @@ export const meta = {
 				nullable: false,
 				ref: "QueueCount",
 			},
+			backgroundQueue: {
+				optional: false,
+				nullable: false,
+				ref: "QueueCount",
+			},
 		},
 	},
 } as const;
@@ -52,11 +58,13 @@ export default define(meta, paramDef, async (ps) => {
 	const inboxJobCounts = await inboxQueue.getJobCounts();
 	const dbJobCounts = await dbQueue.getJobCounts();
 	const objectStorageJobCounts = await objectStorageQueue.getJobCounts();
+	const backgroundJobCounts = await backgroundQueue.getJobCounts();
 
 	return {
 		deliver: deliverJobCounts,
 		inbox: inboxJobCounts,
 		db: dbJobCounts,
 		objectStorage: objectStorageJobCounts,
+		backgroundQueue: backgroundJobCounts,
 	};
 });
diff --git a/packages/backend/src/server/api/endpoints/admin/search/index-all.ts b/packages/backend/src/server/api/endpoints/admin/search/index-all.ts
new file mode 100644
index 0000000000..135b48eccd
--- /dev/null
+++ b/packages/backend/src/server/api/endpoints/admin/search/index-all.ts
@@ -0,0 +1,28 @@
+import define from "../../../define.js";
+import { createIndexAllNotesJob } from "@/queue/index.js";
+
+export const meta = {
+	tags: ["admin"],
+
+	requireCredential: true,
+	requireModerator: true,
+} as const;
+
+export const paramDef = {
+	type: "object",
+	properties: {
+		cursor: {
+			type: "string",
+			format: "misskey:id",
+			nullable: true,
+			default: null,
+		},
+	},
+	required: [],
+} as const;
+
+export default define(meta, paramDef, async (ps, _me) => {
+	createIndexAllNotesJob({
+		cursor: ps.cursor ?? undefined,
+	});
+});
diff --git a/packages/backend/src/server/api/endpoints/notes/search.ts b/packages/backend/src/server/api/endpoints/notes/search.ts
index ce60436db8..5e431d4f7d 100644
--- a/packages/backend/src/server/api/endpoints/notes/search.ts
+++ b/packages/backend/src/server/api/endpoints/notes/search.ts
@@ -1,7 +1,9 @@
 import { In } from "typeorm";
 import { Notes } from "@/models/index.js";
+import { Note } from "@/models/entities/note.js";
 import config from "@/config/index.js";
 import es from "../../../../db/elasticsearch.js";
+import sonic from "../../../../db/sonic.js";
 import define from "../../define.js";
 import { makePaginationQuery } from "../../common/make-pagination-query.js";
 import { generateVisibilityQuery } from "../../common/generate-visibility-query.js";
@@ -59,7 +61,7 @@ export const paramDef = {
 } as const;
 
 export default define(meta, paramDef, async (ps, me) => {
-	if (es == null) {
+	if (es == null && sonic == null) {
 		const query = makePaginationQuery(
 			Notes.createQueryBuilder("note"),
 			ps.sinceId,
@@ -92,9 +94,82 @@ export default define(meta, paramDef, async (ps, me) => {
 		if (me) generateMutedUserQuery(query, me);
 		if (me) generateBlockedUserQuery(query, me);
 
-		const notes = await query.take(ps.limit).getMany();
+		const notes: Note[] = await query.take(ps.limit).getMany();
 
 		return await Notes.packMany(notes, me);
+	} else if (sonic) {
+		let start = 0;
+		const chunkSize = 100;
+
+		// Use sonic to fetch and step through all search results that could match the requirements
+		const ids = [];
+		while (true) {
+			const results = await sonic.search.query(
+				sonic.collection,
+				sonic.bucket,
+				ps.query,
+				{
+					limit: chunkSize,
+					offset: start,
+				},
+			);
+
+			start += chunkSize;
+
+			if (results.length === 0) {
+				break;
+			}
+
+			const res = results
+				.map((k) => JSON.parse(k))
+				.filter((key) => {
+					if (ps.userId && key.userId !== ps.userId) {
+						return false;
+					}
+					if (ps.channelId && key.channelId !== ps.channelId) {
+						return false;
+					}
+					if (ps.sinceId && key.id <= ps.sinceId) {
+						return false;
+					}
+					if (ps.untilId && key.id >= ps.untilId) {
+						return false;
+					}
+					return true;
+				})
+				.map((key) => key.id);
+
+				ids.push(...res);
+		}
+
+		// Sort all the results by note id DESC (newest first)
+		ids.sort((a, b) => b - a);
+
+		// Fetch the notes from the database until we have enough to satisfy the limit
+		start = 0;
+		const found = [];
+		while (found.length < ps.limit && start < ids.length) {
+			const chunk = ids.slice(start, start + chunkSize);
+			const notes: Note[] = await Notes.find({
+				where: {
+					id: In(chunk),
+				},
+				order: {
+					id: "DESC",
+				},
+			});
+
+			// The notes are checked for visibility and muted/blocked users when packed
+			found.push(...await Notes.packMany(notes, me));
+			start += chunkSize;
+		}
+
+		// If we have more results than the limit, trim them
+		if (found.length > ps.limit) {
+			found.length = ps.limit;
+		}
+
+		return found;
 	} else {
 		const userQuery =
 			ps.userId != null
diff --git a/packages/backend/src/services/note/create.ts b/packages/backend/src/services/note/create.ts
index 968aed880f..6c7fd9ad57 100644
--- a/packages/backend/src/services/note/create.ts
+++ b/packages/backend/src/services/note/create.ts
@@ -1,5 +1,6 @@
 import * as mfm from "mfm-js";
 import es from "../../db/elasticsearch.js";
+import sonic from "../../db/sonic.js";
 import {
 	publishMainStream,
 	publishNotesStream,
@@ -588,7 +589,7 @@ export default async (
 		}
 
 		// Register to search database
-		index(note);
+		await index(note);
 	});
 
 async function renderNoteOrRenoteActivity(data: Option, note: Note) {
@@ -728,18 +729,34 @@ async function insertNote(
 	}
 }
 
-function index(note: Note) {
-	if (note.text == null || config.elasticsearch == null) return;
+export async function index(note: Note): Promise<void> {
+	if (!note.text) return;
 
-	es!.index({
-		index: config.elasticsearch.index || "misskey_note",
-		id: note.id.toString(),
-		body: {
-			text: normalizeForSearch(note.text),
-			userId: note.userId,
-			userHost: note.userHost,
-		},
-	});
+	if (config.elasticsearch && es) {
+		es.index({
+			index: config.elasticsearch.index || "misskey_note",
+			id: note.id.toString(),
+			body: {
+				text: normalizeForSearch(note.text),
+				userId: note.userId,
+				userHost: note.userHost,
+			},
+		});
+	}
+
+	if (sonic) {
+		await sonic.ingest.push(
+			sonic.collection,
+			sonic.bucket,
+			JSON.stringify({
+				id: note.id,
+				userId: note.userId,
+				userHost: note.userHost,
+				channelId: note.channelId,
+			}),
+			note.text,
+		);
+	}
 }
 
 async function notifyToWatchersOfRenotee(
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index de12004772..37bc6c8054 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -196,6 +196,7 @@ importers:
       seedrandom: ^3.0.5
       semver: 7.3.8
       sharp: 0.31.3
+      sonic-channel: ^1.3.1
       speakeasy: 2.0.0
       strict-event-emitter-types: 2.0.0
       stringz: 2.1.0
@@ -310,6 +311,7 @@ importers:
       seedrandom: 3.0.5
       semver: 7.3.8
       sharp: 0.31.3
+      sonic-channel: 1.3.1
       speakeasy: 2.0.0
       stringz: 2.1.0
       summaly: 2.7.0
@@ -11594,6 +11596,11 @@ packages:
       smart-buffer: 4.2.0
     dev: false
 
+  /sonic-channel/1.3.1:
+    resolution: {integrity: sha512-+K4IZVFE7Tf2DB4EFZ23xo7a/+gJaiOHhFzXVZpzkX6Rs/rvf4YbSxnEGdYw8mrTcjtpG+jLVQEhP8sNTtN5VA==}
+    engines: {node: '>= 6.0.0'}
+    dev: false
+
   /sort-keys-length/1.0.1:
     resolution: {integrity: sha512-GRbEOUqCxemTAk/b32F2xa8wDTs+Z1QHOkbhJDQTvv/6G3ZkbJ+frYWsTcc7cBB3Fu4wy4XlLCuNtJuMn7Gsvw==}
     engines: {node: '>=0.10.0'}