diff --git a/apps/api/src/app.test.ts b/apps/api/src/app.test.ts
new file mode 100644
index 0000000..2251709
--- /dev/null
+++ b/apps/api/src/app.test.ts
@@ -0,0 +1,109 @@
+import { describe, expect, it } from 'vitest';
+import { MAX_BODY_BYTES } from './app.js';
+import { flush, setup, T0, validBody } from './testing.js';
+
+describe('GET /api/health', () => {
+  it('отдаёт версию', async () => {
+    const { app } = setup({ version: 'abc123' });
+    const res = await app.request('/api/health');
+    expect(await res.json()).toEqual({ ok: true, version: 'abc123' });
+  });
+});
+
+describe('POST /api/lead', () => {
+  it('201: сохраняет заявку с нормализованным телефоном, касаниями и user agent', async () => {
+    const { db, post } = setup();
+    const res = await post(validBody(), { 'user-agent': 'Mozilla/5.0 test' });
+
+    expect(res.status).toBe(201);
+    expect(await res.json()).toEqual({ ok: true, duplicate: false });
+    const row = db.prepare('SELECT * FROM leads').get() as Record<string, unknown>;
+    expect(row).toMatchObject({
+      id: 1,
+      created_at: T0.toISOString(),
+      phone: '+375291234567',
+      name: 'Аня',
+      interest: 'subscription',
+      comment: 'Под эспрессо',
+      user_agent: 'Mozilla/5.0 test',
+      tg_status: 'pending',
+      tg_attempts: 0,
+    });
+    expect(JSON.parse(row.first_touch as string)).toMatchObject({ utm_source: 'instagram' });
+    expect(JSON.parse(row.last_touch as string)).toMatchObject({ utm_source: 'yandex', submitPage: '/#form' });
+  });
+
+  it('номер заявки клиенту не отдаёт', async () => {
+    const { post } = setup();
+    const text = await (await post(validBody())).text();
+    expect(text).toBe('{"ok":true,"duplicate":false}');
+  });
+
+  it('notifier получает id заявки уже после ответа', async () => {
+    const { post, events } = setup();
+    await post(validBody());
+    expect(events).toEqual([]);
+    await flush();
+    expect(events).toEqual([{ kind: 'lead', leadId: 1 }]);
+  });
+
+  it('упавший notifier не ломает ответ', async () => {
+    const { post, db } = setup({
+      notifier: {
+        leadSaved: () => Promise.reject(new Error('telegram down')),
+      },
+    });
+    const res = await post(validBody());
+    await flush();
+    expect(res.status).toBe(201);
+    expect(db.prepare('SELECT count(*) AS n FROM leads').get()).toEqual({ n: 1 });
+  });
+
+  it('400 validation: ошибки по полям, ничего не пишет', async () => {
+    const { post, db, events } = setup();
+    const res = await post(validBody({ name: ' ', phone: '+7 999 123-45-67' }));
+    expect(res.status).toBe(400);
+    const body = (await res.json()) as { fieldErrors: Record<string, string> };
+    expect(body).toMatchObject({ ok: false, error: 'validation' });
+    expect(Object.keys(body.fieldErrors).sort()).toEqual(['name', 'phone']);
+    await flush();
+    expect(events).toEqual([]);
+    expect(db.prepare('SELECT count(*) AS n FROM leads').get()).toEqual({ n: 0 });
+  });
+
+  it('400 bad_request: битый JSON', async () => {
+    const { post } = setup();
+    const res = await post('{"name":');
+    expect(res.status).toBe(400);
+    expect(await res.json()).toEqual({ ok: false, error: 'bad_request' });
+  });
+
+  it('415: не JSON', async () => {
+    const { post } = setup();
+    const res = await post('name=Аня', { 'content-type': 'application/x-www-form-urlencoded' });
+    expect(res.status).toBe(415);
+    expect(await res.json()).toEqual({ ok: false, error: 'bad_request' });
+  });
+
+  it('JSON с charset принимается', async () => {
+    const { post } = setup();
+    const res = await post(validBody(), { 'content-type': 'application/json; charset=utf-8' });
+    expect(res.status).toBe(201);
+  });
+
+  it('413: тело больше 16 КБ', async () => {
+    const { post, db } = setup();
+    const res = await post(validBody({ comment: 'а'.repeat(MAX_BODY_BYTES) }));
+    expect(res.status).toBe(413);
+    expect(await res.json()).toEqual({ ok: false, error: 'bad_request' });
+    expect(db.prepare('SELECT count(*) AS n FROM leads').get()).toEqual({ n: 0 });
+  });
+
+  it('500 server: исключение при записи', async () => {
+    const { post, db } = setup();
+    db.close();
+    const res = await post(validBody());
+    expect(res.status).toBe(500);
+    expect(await res.json()).toEqual({ ok: false, error: 'server' });
+  });
+});
diff --git a/apps/api/src/app.ts b/apps/api/src/app.ts
index 26d74b0..64d0a66 100644
--- a/apps/api/src/app.ts
+++ b/apps/api/src/app.ts
@@ -1,7 +1,56 @@
 import { Hono } from 'hono';
+import { bodyLimit } from 'hono/body-limit';
+import { validateLead, type LeadResponse } from '@kvarta/shared/lead';
+import type { Db } from './db/index.js';
+import { saveLead } from './leads.js';
+import { notifyLater, type Notifier } from './notifier.js';
 
-export function createApp() {
+export type AppDeps = {
+  db: Db;
+  now: () => Date;
+  notifier: Notifier;
+  version?: string;
+};
+
+export const MAX_BODY_BYTES = 16 * 1024;
+const USER_AGENT_MAX = 500;
+
+export function createApp(deps: AppDeps) {
   const app = new Hono();
-  app.get('/api/health', (c) => c.json({ ok: true, version: process.env.APP_VERSION ?? 'dev' }));
+  const reply = (body: LeadResponse, status: 200 | 201 | 400 | 413 | 415 | 500) => Response.json(body, { status });
+
+  app.onError((err) => {
+    console.error(err);
+    return reply({ ok: false, error: 'server' }, 500);
+  });
+
+  app.get('/api/health', (c) => c.json({ ok: true, version: deps.version ?? 'dev' }));
+
+  app.post(
+    '/api/lead',
+    async (c, next) => {
+      const type = c.req.header('content-type')?.split(';')[0]?.trim().toLowerCase();
+      if (type !== 'application/json') return reply({ ok: false, error: 'bad_request' }, 415);
+      await next();
+    },
+    bodyLimit({ maxSize: MAX_BODY_BYTES, onError: () => reply({ ok: false, error: 'bad_request' }, 413) }),
+    async (c) => {
+      let body: unknown;
+      try {
+        body = await c.req.json();
+      } catch {
+        return reply({ ok: false, error: 'bad_request' }, 400);
+      }
+
+      const result = validateLead(body);
+      if (!result.ok) return reply({ ok: false, error: 'validation', fieldErrors: result.fieldErrors }, 400);
+
+      const userAgent = c.req.header('user-agent')?.slice(0, USER_AGENT_MAX) ?? null;
+      const saved = saveLead(deps.db, result.data, { now: deps.now(), userAgent });
+      notifyLater(deps.notifier, saved.event);
+      return reply({ ok: true, duplicate: false }, 201);
+    },
+  );
+
   return app;
 }
diff --git a/apps/api/src/db/db.test.ts b/apps/api/src/db/db.test.ts
new file mode 100644
index 0000000..ccf7a61
--- /dev/null
+++ b/apps/api/src/db/db.test.ts
@@ -0,0 +1,59 @@
+import { existsSync, mkdtempSync, rmSync } from 'node:fs';
+import { tmpdir } from 'node:os';
+import { join } from 'node:path';
+import Database from 'better-sqlite3';
+import { afterEach, describe, expect, it } from 'vitest';
+import { migrate, openDb } from './index.js';
+import { MIGRATIONS } from './migrations.js';
+
+const dirs: string[] = [];
+afterEach(() => {
+  for (const dir of dirs.splice(0)) rmSync(dir, { recursive: true, force: true });
+});
+
+describe('openDb', () => {
+  it('создаёт каталог, включает WAL и внешние ключи, применяет миграции', () => {
+    const dir = mkdtempSync(join(tmpdir(), 'kvarta-db-'));
+    dirs.push(dir);
+    const path = join(dir, 'nested', 'kvarta.sqlite');
+
+    const db = openDb(path);
+    expect(existsSync(path)).toBe(true);
+    expect(db.pragma('journal_mode', { simple: true })).toBe('wal');
+    expect(db.pragma('foreign_keys', { simple: true })).toBe(1);
+    expect(db.pragma('user_version', { simple: true })).toBe(MIGRATIONS.length);
+    db.close();
+
+    // Повторное открытие не пытается создать таблицы заново.
+    const again = openDb(path);
+    expect(again.pragma('user_version', { simple: true })).toBe(MIGRATIONS.length);
+    again.close();
+  });
+
+  it('схема совпадает с планом', () => {
+    const db = openDb(':memory:');
+    const columns = (table: string) =>
+      (db.prepare(`PRAGMA table_info(${table})`).all() as { name: string }[]).map((c) => c.name);
+    expect(columns('leads')).toEqual([
+      'id', 'created_at', 'phone', 'name', 'interest', 'comment', 'first_touch', 'last_touch',
+      'user_agent', 'tg_status', 'tg_attempts', 'tg_last_error', 'tg_next_at',
+    ]);
+    expect(columns('lead_clarifications')).toEqual([
+      'id', 'lead_id', 'created_at', 'name', 'interest', 'comment', 'last_touch',
+      'tg_status', 'tg_attempts', 'tg_last_error', 'tg_next_at',
+    ]);
+    expect(() =>
+      db.prepare(
+        `INSERT INTO lead_clarifications (lead_id, created_at, name, interest, last_touch) VALUES (99, 'x', 'x', 'question', '{}')`,
+      ).run(),
+    ).toThrow(/FOREIGN KEY/);
+    db.close();
+  });
+
+  it('отказывается работать с базой новее кода', () => {
+    const db = new Database(':memory:');
+    db.pragma(`user_version = ${MIGRATIONS.length + 1}`);
+    expect(() => migrate(db)).toThrow(/новее кода/);
+    db.close();
+  });
+});
diff --git a/apps/api/src/db/index.ts b/apps/api/src/db/index.ts
new file mode 100644
index 0000000..be737e0
--- /dev/null
+++ b/apps/api/src/db/index.ts
@@ -0,0 +1,37 @@
+import { mkdirSync } from 'node:fs';
+import { dirname } from 'node:path';
+import Database from 'better-sqlite3';
+import { MIGRATIONS } from './migrations.js';
+
+export type Db = Database.Database;
+
+export const DEFAULT_DB_PATH = './data/kvarta.sqlite';
+
+/** Открывает базу и доводит схему до текущей версии. `:memory:` — для тестов. */
+export function openDb(path: string = DEFAULT_DB_PATH): Db {
+  if (path !== ':memory:') mkdirSync(dirname(path), { recursive: true });
+  const db = new Database(path);
+  try {
+    db.pragma('journal_mode = WAL');
+    db.pragma('foreign_keys = ON');
+    migrate(db);
+  } catch (err) {
+    db.close();
+    throw err;
+  }
+  return db;
+}
+
+export function migrate(db: Db): void {
+  const current = db.pragma('user_version', { simple: true }) as number;
+  // База новее кода (свежий бэкап на старой версии) — откатывать схему не умеем, лучше не стартовать.
+  if (current > MIGRATIONS.length) {
+    throw new Error(`Схема базы v${current} новее кода (v${MIGRATIONS.length})`);
+  }
+  for (let version = current; version < MIGRATIONS.length; version++) {
+    db.transaction(() => {
+      db.exec(MIGRATIONS[version]!);
+      db.pragma(`user_version = ${version + 1}`);
+    })();
+  }
+}
diff --git a/apps/api/src/db/migrations.ts b/apps/api/src/db/migrations.ts
new file mode 100644
index 0000000..2e0dd0b
--- /dev/null
+++ b/apps/api/src/db/migrations.ts
@@ -0,0 +1,36 @@
+// Миграции по порядку: индекс в массиве + 1 = PRAGMA user_version после применения.
+// Уже выкаченные миграции не меняем — только дописываем новые в конец.
+export const MIGRATIONS: readonly string[] = [
+  `
+  CREATE TABLE leads (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    created_at TEXT NOT NULL,
+    phone TEXT NOT NULL,
+    name TEXT NOT NULL,
+    interest TEXT NOT NULL CHECK (interest IN ('subscription','one_time','question')),
+    comment TEXT,
+    first_touch TEXT,
+    last_touch TEXT NOT NULL,
+    user_agent TEXT,
+    tg_status TEXT NOT NULL DEFAULT 'pending' CHECK (tg_status IN ('pending','sent','failed')),
+    tg_attempts INTEGER NOT NULL DEFAULT 0,
+    tg_last_error TEXT,
+    tg_next_at TEXT
+  );
+  CREATE INDEX leads_phone_created ON leads(phone, created_at);
+
+  CREATE TABLE lead_clarifications (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    lead_id INTEGER NOT NULL REFERENCES leads(id),
+    created_at TEXT NOT NULL,
+    name TEXT NOT NULL,
+    interest TEXT NOT NULL,
+    comment TEXT,
+    last_touch TEXT NOT NULL,
+    tg_status TEXT NOT NULL DEFAULT 'pending' CHECK (tg_status IN ('pending','sent','failed')),
+    tg_attempts INTEGER NOT NULL DEFAULT 0,
+    tg_last_error TEXT,
+    tg_next_at TEXT
+  );
+  `,
+];
diff --git a/apps/api/src/index.ts b/apps/api/src/index.ts
index c6bbccc..045a784 100644
--- a/apps/api/src/index.ts
+++ b/apps/api/src/index.ts
@@ -1,7 +1,38 @@
 import { serve } from '@hono/node-server';
 import { createApp } from './app.js';
+import { DEFAULT_DB_PATH, openDb } from './db/index.js';
+import { noopNotifier } from './notifier.js';
 
 const port = Number(process.env.PORT ?? 3001);
-serve({ fetch: createApp().fetch, port }, (info) => {
+const db = openDb(process.env.DB_PATH ?? DEFAULT_DB_PATH);
+
+const app = createApp({
+  db,
+  now: () => new Date(),
+  notifier: noopNotifier,
+  version: process.env.APP_VERSION,
+});
+
+const server = serve({ fetch: app.fetch, port }, (info) => {
   console.log(`api listening on :${info.port}`);
 });
+
+let stopping = false;
+function shutdown(signal: string) {
+  if (stopping) return;
+  stopping = true;
+  console.log(`${signal}: останавливаемся`);
+  // Сначала дожидаемся текущих запросов, потом закрываем базу — иначе запись оборвётся на полуслове.
+  server.close(() => {
+    db.close();
+    process.exit(0);
+  });
+  setTimeout(() => {
+    console.error('не дождались запросов, выходим');
+    db.close();
+    process.exit(1);
+  }, 10_000).unref();
+}
+
+process.on('SIGTERM', () => shutdown('SIGTERM'));
+process.on('SIGINT', () => shutdown('SIGINT'));
diff --git a/apps/api/src/leads.ts b/apps/api/src/leads.ts
new file mode 100644
index 0000000..404bc87
--- /dev/null
+++ b/apps/api/src/leads.ts
@@ -0,0 +1,26 @@
+import type { ValidLead } from '@kvarta/shared/lead';
+import type { Db } from './db/index.js';
+import type { LeadEvent } from './notifier.js';
+
+export type SaveMeta = { now: Date; userAgent: string | null };
+
+export type SaveResult = { kind: 'created'; event: LeadEvent };
+
+export function saveLead(db: Db, lead: ValidLead, meta: SaveMeta): SaveResult {
+  const { lastInsertRowid } = db
+    .prepare(
+      `INSERT INTO leads (created_at, phone, name, interest, comment, first_touch, last_touch, user_agent)
+       VALUES (?, ?, ?, ?, ?, ?, ?, ?)`,
+    )
+    .run(
+      meta.now.toISOString(),
+      lead.phone,
+      lead.name,
+      lead.interest,
+      lead.comment,
+      lead.firstTouch ? JSON.stringify(lead.firstTouch) : null,
+      JSON.stringify(lead.lastTouch),
+      meta.userAgent,
+    );
+  return { kind: 'created', event: { kind: 'lead', leadId: Number(lastInsertRowid) } };
+}
diff --git a/apps/api/src/notifier.ts b/apps/api/src/notifier.ts
new file mode 100644
index 0000000..d0e00e3
--- /dev/null
+++ b/apps/api/src/notifier.ts
@@ -0,0 +1,19 @@
+// Что сообщить менеджеру после записи в базу. Только id: текст и статус отправки
+// очередь берёт из строки (tg_*), поэтому событие можно потерять — строка останется pending.
+export type LeadEvent = { kind: 'lead'; leadId: number };
+
+export interface Notifier {
+  /** Зовётся после ответа клиенту; ошибки и долгие промисы на ответ не влияют. */
+  leadSaved(event: LeadEvent): void | Promise<void>;
+}
+
+export const noopNotifier: Notifier = { leadSaved() {} };
+
+/** Отложить вызов до отправки ответа и проглотить ошибку: заявка уже в базе. */
+export function notifyLater(notifier: Notifier, event: LeadEvent): void {
+  setImmediate(() => {
+    Promise.resolve()
+      .then(() => notifier.leadSaved(event))
+      .catch((err: unknown) => console.error('notifier failed', event, err));
+  });
+}
diff --git a/apps/api/src/testing.ts b/apps/api/src/testing.ts
new file mode 100644
index 0000000..d84ece2
--- /dev/null
+++ b/apps/api/src/testing.ts
@@ -0,0 +1,43 @@
+// Общие заготовки для тестов api: база в памяти, управляемые часы, notifier-шпион.
+import type { LeadRequest } from '@kvarta/shared/lead';
+import { createApp, type AppDeps } from './app.js';
+import { openDb } from './db/index.js';
+import type { LeadEvent, Notifier } from './notifier.js';
+
+export const T0 = new Date('2026-10-17T12:00:00.000Z');
+
+export function validBody(overrides: Partial<LeadRequest> = {}): LeadRequest {
+  return {
+    name: 'Аня',
+    phone: '+375 29 123-45-67',
+    interest: 'subscription',
+    comment: 'Под эспрессо',
+    firstTouch: { utm_source: 'instagram', landingPage: '/', at: '2026-10-10T10:00:00.000Z' },
+    lastTouch: { utm_source: 'yandex', landingPage: '/', submitPage: '/#form', at: '2026-10-17T11:59:00.000Z' },
+    ...overrides,
+  };
+}
+
+export function setup(overrides: Partial<AppDeps> = {}) {
+  const db = openDb(':memory:');
+  const clock = { now: T0 };
+  const events: LeadEvent[] = [];
+  const notifier: Notifier = { leadSaved: (e) => void events.push(e) };
+  const app = createApp({ db, now: () => clock.now, notifier, ...overrides });
+
+  const post = (body: unknown, headers: Record<string, string> = {}) =>
+    app.request('/api/lead', {
+      method: 'POST',
+      headers: { 'content-type': 'application/json', ...headers },
+      body: typeof body === 'string' ? body : JSON.stringify(body),
+    });
+
+  const advance = (ms: number) => {
+    clock.now = new Date(clock.now.getTime() + ms);
+  };
+
+  return { app, db, clock, events, post, advance };
+}
+
+/** notifier зовётся через setImmediate — ждём, пока очередь событий опустеет. */
+export const flush = () => new Promise<void>((resolve) => setImmediate(resolve));