Phase 5 구현: SQLite DB + History/Dictionary 서비스 + UI

- DB: better-sqlite3 + drizzle-orm (history/dictionary/stats, WAL 모드)
- HistoryService: CRUD + 검색 + 통계 + 30일 보존 정책, 세션 완료 시 자동 저장
- DictionaryService: CRUD + 검색 + 사용 횟수 추적 + STT 프롬프트 힌트
- HistoryPage: 목록 + 검색 + 삭제 + 복사 + 페이지네이션
- DictionaryPage: 목록 + 검색 + 추가 다이얼로그 + 삭제
- DashboardPage: 실데이터 통계 (총/오늘 세션, 시간, 단어수, 연속일수)
- IPC: history/dictionary/stats 핸들러 + preload API
- Bootstrap: DB 초기화 (critical) + 이력 자동 저장 연동

src/main/services/HistoryService.ts

@@ -0,0 +1,219 @@
+// src/main/services/HistoryService.ts
+// SQLite 기반 전사/명령 이력 저장. 설계서 01/03 IHistoryService 구현.
+
+import { eq, desc, like, and, sql, count } from 'drizzle-orm'
+import { nanoid } from 'nanoid'
+import { getDatabase } from '../db'
+import { history, stats } from '../db/schema'
+import type { History, NewHistory } from '../db/schema'
+import { getLogger } from './LoggerService'
+import type {
+  HistoryEntry,
+  HistoryQueryParams,
+  HistoryPage,
+  HistorySearchParams,
+  StatsSummary
+} from '@shared/types'
+
+const logger = getLogger('HistoryService')
+
+class HistoryService {
+  create(input: Omit<NewHistory, 'id' | 'createdAt' | 'updatedAt'>): HistoryEntry {
+    const db = getDatabase()
+    const now = Date.now()
+    const id = nanoid()
+
+    const entry: NewHistory = {
+      id,
+      ...input,
+      createdAt: now,
+      updatedAt: now
+    }
+
+    db.insert(history).values(entry).run()
+
+    // stats 싱글톤 업데이트
+    this._updateStats(input.duration, input.wordCount)
+
+    logger.info(`History entry created: ${id}`)
+    return this._toEntry(entry as History)
+  }
+
+  getById(id: string): HistoryEntry | null {
+    const db = getDatabase()
+    const row = db.select().from(history).where(eq(history.id, id)).get()
+    return row ? this._toEntry(row) : null
+  }
+
+  list(params: HistoryQueryParams): HistoryPage {
+    const db = getDatabase()
+    const { page, pageSize } = params
+
+    const totalResult = db.select({ count: count() }).from(history).get()
+    const total = totalResult?.count ?? 0
+
+    const entries = db
+      .select()
+      .from(history)
+      .orderBy(desc(history.createdAt))
+      .limit(pageSize)
+      .offset(page * pageSize)
+      .all()
+
+    return {
+      entries: entries.map((e) => this._toEntry(e)),
+      total,
+      page,
+      pageSize,
+      totalPages: Math.ceil(total / pageSize)
+    }
+  }
+
+  search(params: HistorySearchParams): HistoryPage {
+    const db = getDatabase()
+    const { query, page, pageSize } = params
+    const pattern = `%${query}%`
+
+    const conditions = and(
+      like(history.originalText, pattern)
+    )
+
+    const totalResult = db
+      .select({ count: count() })
+      .from(history)
+      .where(conditions)
+      .get()
+    const total = totalResult?.count ?? 0
+
+    const entries = db
+      .select()
+      .from(history)
+      .where(conditions)
+      .orderBy(desc(history.createdAt))
+      .limit(pageSize)
+      .offset(page * pageSize)
+      .all()
+
+    return {
+      entries: entries.map((e) => this._toEntry(e)),
+      total,
+      page,
+      pageSize,
+      totalPages: Math.ceil(total / pageSize)
+    }
+  }
+
+  delete(id: string): boolean {
+    const db = getDatabase()
+    const result = db.delete(history).where(eq(history.id, id)).run()
+    return result.changes > 0
+  }
+
+  deleteAll(): void {
+    const db = getDatabase()
+    db.delete(history).run()
+    logger.info('All history entries deleted')
+  }
+
+  getStats(): StatsSummary {
+    const db = getDatabase()
+    const row = db.select().from(stats).where(eq(stats.id, 1)).get()
+
+    const todayStart = new Date()
+    todayStart.setHours(0, 0, 0, 0)
+    const todayMs = todayStart.getTime()
+
+    const todayResult = db
+      .select({
+        sessions: count(),
+        duration: sql<number>`COALESCE(SUM(duration), 0)`,
+        words: sql<number>`COALESCE(SUM(word_count), 0)`
+      })
+      .from(history)
+      .where(
+        and(
+          sql`created_at >= ${todayMs}`,
+          eq(history.status, 'completed')
+        )
+      )
+      .get()
+
+    return {
+      totalRecordingTimeMs: (row?.totalDuration ?? 0) * 1000,
+      totalWordCount: row?.totalWords ?? 0,
+      totalSessionCount: row?.sessionCount ?? 0,
+      todayRecordingTimeMs: (todayResult?.duration ?? 0) * 1000,
+      todayWordCount: todayResult?.words ?? 0,
+      todaySessionCount: todayResult?.sessions ?? 0,
+      streakDays: row?.streakDays ?? 0
+    }
+  }
+
+  /**
+   * 보존 정책에 따라 오래된 항목 정리 (30일 초과)
+   */
+  runRetentionCleanup(): number {
+    const db = getDatabase()
+    const cutoff = Date.now() - 30 * 24 * 60 * 60 * 1000
+    const result = db.delete(history).where(sql`created_at < ${cutoff}`).run()
+    if (result.changes > 0) {
+      logger.info(`Retention cleanup: ${result.changes} old entries removed`)
+    }
+    return result.changes
+  }
+
+  dispose(): void {
+    logger.info('HistoryService disposed')
+  }
+
+  private _updateStats(duration: number, wordCount: number): void {
+    const db = getDatabase()
+    const now = Date.now()
+
+    db.update(stats)
+      .set({
+        totalDuration: sql`total_duration + ${duration}`,
+        totalWords: sql`total_words + ${wordCount}`,
+        sessionCount: sql`session_count + 1`,
+        lastSessionAt: now,
+        lastUpdated: now
+      })
+      .where(eq(stats.id, 1))
+      .run()
+  }
+
+  private _toEntry(row: History): HistoryEntry {
+    return {
+      id: row.id,
+      originalText: row.originalText,
+      polishedText: row.polishedText,
+      focusedApp: row.focusedApp,
+      focusedAppName: row.focusedAppName,
+      focusedAppWindowTitle: row.focusedAppWindowTitle,
+      mode: row.mode as HistoryEntry['mode'],
+      status: row.status as HistoryEntry['status'],
+      errorCode: row.errorCode,
+      audioLocalPath: row.audioLocalPath,
+      duration: row.duration,
+      detectedLanguage: row.detectedLanguage,
+      micDevice: row.micDevice,
+      wordCount: row.wordCount,
+      sttModel: row.sttModel,
+      llmModel: row.llmModel,
+      sttLatencyMs: row.sttLatencyMs,
+      llmLatencyMs: row.llmLatencyMs,
+      createdAt: row.createdAt,
+      updatedAt: row.updatedAt,
+      appVersion: row.appVersion
+    }
+  }
+}
+
+let instance: HistoryService | null = null
+
+export function getHistoryService(): HistoryService {
+  if (!instance) {
+    instance = new HistoryService()
+  }
+  return instance
+}