fix: EmptyState по центру и импорт SQLite без 413

Центрирование заглушек в графиках/Frame; лимит тела backup 100 MiB;
WAL checkpoint при экспорте и очистка -wal/-shm при импорте.

Co-authored-by: Cursor <[email protected]>

packages/db/src/index.ts

@@ -1,10 +1,12 @@
 import Database from 'better-sqlite3'
 import { drizzle, type BetterSQLite3Database } from 'drizzle-orm/better-sqlite3'
-import { existsSync, mkdirSync, writeFileSync } from 'node:fs'
+import { existsSync, mkdirSync, readFileSync, unlinkSync, writeFileSync } from 'node:fs'
 import { dirname, resolve } from 'node:path'
 import * as schema from './schema/index.js'
 import { ensureRuntimeSchema } from './runtime-migrate.js'
 
+const SQLITE_HEADER = Buffer.from('SQLite format 3\0')
+
 export type Db = BetterSQLite3Database<typeof schema>
 
 let _db: Db | null = null
@@ -46,10 +48,40 @@ export function closeDb(): void {
   }
 }
 
+function removeSidecarFiles(dbPath: string): void {
+  for (const suffix of ['-wal', '-shm'] as const) {
+    const side = `${dbPath}${suffix}`
+    if (existsSync(side)) unlinkSync(side)
+  }
+}
+
+/**
+ * Согласованный снимок файла БД: checkpoint WAL → чтение основного файла.
+ * Без checkpoint экспорт может быть неполным (данные только в *-wal).
+ */
+export function readDatabaseFileBuffer(): Buffer {
+  const sqlite = getSqlite()
+  sqlite.pragma('wal_checkpoint(TRUNCATE)')
+  return readFileSync(getDbPath())
+}
+
 /** Заменить файл SQLite и переоткрыть соединение. */
 export function reloadDatabaseFromBuffer(buffer: Buffer): void {
+  if (!Buffer.isBuffer(buffer) || buffer.length < SQLITE_HEADER.length) {
+    throw new Error('Файл не похож на SQLite базу')
+  }
+  if (!buffer.subarray(0, SQLITE_HEADER.length).equals(SQLITE_HEADER)) {
+    throw new Error('Файл не похож на SQLite базу (неверный заголовок)')
+  }
+
+  const dbPath = getDbPath()
+  const dir = dirname(dbPath)
+  if (!existsSync(dir)) mkdirSync(dir, { recursive: true })
+
   closeDb()
-  writeFileSync(getDbPath(), buffer)
+  // Старые WAL/SHM от предыдущей БД ломают открытие нового файла
+  removeSidecarFiles(dbPath)
+  writeFileSync(dbPath, buffer)
   openDatabase()
 }
 

packages/db/src/reload-database.test.ts

@@ -0,0 +1,69 @@
+import { afterEach, describe, expect, it } from 'vitest'
+import Database from 'better-sqlite3'
+import { mkdtempSync, readFileSync, writeFileSync, existsSync, rmSync } from 'node:fs'
+import { tmpdir } from 'node:os'
+import { join } from 'node:path'
+import {
+  closeDb,
+  getDb,
+  getSqlite,
+  readDatabaseFileBuffer,
+  reloadDatabaseFromBuffer,
+} from './index.js'
+
+describe('reloadDatabaseFromBuffer / readDatabaseFileBuffer', () => {
+  let dir: string
+
+  afterEach(() => {
+    closeDb()
+    delete process.env.DB_PATH
+    if (dir && existsSync(dir)) rmSync(dir, { recursive: true, force: true })
+  })
+
+  it('rejects non-sqlite buffer', () => {
+    dir = mkdtempSync(join(tmpdir(), 'vt-db-'))
+    process.env.DB_PATH = join(dir, 'app.db')
+    getDb()
+    expect(() => reloadDatabaseFromBuffer(Buffer.from('not-a-db'))).toThrow(/SQLite/)
+  })
+
+  it('replaces db and drops leftover wal/shm', () => {
+    dir = mkdtempSync(join(tmpdir(), 'vt-db-'))
+    const dbPath = join(dir, 'app.db')
+    process.env.DB_PATH = dbPath
+    getDb()
+    getSqlite().exec('CREATE TABLE IF NOT EXISTS t (id INTEGER PRIMARY KEY); INSERT INTO t VALUES (1);')
+    closeDb()
+
+    // Simulate stale sidecars after closed connection (Windows locks *-shm while open)
+    writeFileSync(`${dbPath}-wal`, Buffer.alloc(32))
+    writeFileSync(`${dbPath}-shm`, Buffer.alloc(32))
+
+    const donorPath = join(dir, 'donor.db')
+    const donor = new Database(donorPath)
+    donor.exec(`CREATE TABLE ok (x TEXT); INSERT INTO ok VALUES ('yes');`)
+    donor.close()
+    const buf = readFileSync(donorPath)
+
+    reloadDatabaseFromBuffer(buf)
+
+    const row = getSqlite().prepare('SELECT x FROM ok').get() as { x: string }
+    expect(row.x).toBe('yes')
+    // Старый мусорный WAL не должен подмешаться: таблица t из прошлой БД отсутствует
+    const tables = getSqlite()
+      .prepare(`SELECT name FROM sqlite_master WHERE type='table' AND name='t'`)
+      .all()
+    expect(tables).toHaveLength(0)
+    closeDb()
+  })
+
+  it('readDatabaseFileBuffer checkpoints wal', () => {
+    dir = mkdtempSync(join(tmpdir(), 'vt-db-'))
+    process.env.DB_PATH = join(dir, 'app.db')
+    getDb()
+    getSqlite().exec('CREATE TABLE IF NOT EXISTS t (id INTEGER PRIMARY KEY); INSERT INTO t VALUES (42);')
+    const buf = readDatabaseFileBuffer()
+    expect(buf.subarray(0, 15).toString('utf8')).toBe('SQLite format 3')
+    expect(buf.length).toBeGreaterThan(100)
+  })
+})