refactor: migrate from sql.js to Redis for data storage

- Removed sql.js dependency and related SQLite database logic.
- Integrated Redis for storing statistics and ratings, updating relevant functions in db.ts.
- Updated architecture documentation and README to reflect the new storage solution.
- Adjusted .gitignore to remove SQLite data references.

Author: betterhyq

.gitignore

@@ -20,9 +20,6 @@
 # production
 /build
 
-# sqlite data
-/data
-
 # misc
 .DS_Store
 *.pem

ARCHITECTURE.md

@@ -14,7 +14,7 @@ LexPlain is a Next.js 16 application with App Router, supporting English and Sim
 | UI | React 19, Tailwind CSS 4, lucide-react |
 | i18n | next-intl |
 | AI | JoyAI (OpenAI-compatible API via `openai` SDK) |
-| Storage | sql.js (SQLite in-memory/file for stats) |
+| Storage | Redis (stats: analyses count, ratings count/sum/positive) |
 
 ## Directory Structure
 
@@ -48,16 +48,14 @@ LexPlain/
 │   │   ├── request.ts          # getRequestConfig (messages, locale)
 │   │   └── routing.ts         # locales, defaultLocale, prefix
 │   ├── lib/
-│   │   ├── db.ts               # sql.js: stats, recordAnalysis, recordRating
+│   │   ├── db.ts               # Redis: stats, recordAnalysis, recordRating
 │   │   └── utils.ts            # cn, prompts, JoyAIFetch, parseJoyAIJson
 │   ├── types/
 │   │   ├── index.ts            # Risk, Clause, AnalysisResult
-│   │   └── sql.js.d.ts
 │   └── proxy.ts                # next-intl middleware (locale routing)
 ├── messages/
 │   ├── en.json
 │   └── zh-CN.json
-├── data/                       # sql.js DB file (lexplain.db)
 ├── next.config.ts
 ├── package.json
 └── tsconfig.json
@@ -118,7 +116,7 @@ User question → Results page → POST /api/ask
 ## Storage & Privacy
 
 - **Documents**: Not stored. User input and AI output stay in browser `sessionStorage` for the results page.
-- **Stats DB**: sql.js SQLite at `data/lexplain.db`
+- **Stats**: Redis (env `REDIS_URL`); keys `stats:analyses`, `stats:ratings:*`
   - `analyses`: `id`, `created_at`
   - `ratings`: `id`, `score`, `created_at`
 

README.md

@@ -16,7 +16,7 @@ LexPlain is a web app that helps you understand legal documents in plain languag
 - **UI:** React 19, [Tailwind CSS](https://tailwindcss.com) 4, [lucide-react](https://lucide.dev)
 - **i18n:** [next-intl](https://next-intl-docs.vercel.app)
 - **AI:** JoyAI (OpenAI-compatible API) for analysis and Q&A
-- **Storage:** sql.js (SQLite) for stats and ratings
+- **Storage:** Redis for stats and ratings (set `REDIS_URL`)
 
 ## Getting Started
 
@@ -56,7 +56,7 @@ Open [http://localhost:3000](http://localhost:3000) in your browser.
 
 - `src/app/` — App Router: `[locale]/` (home, results), `api/` (analyze, ask, rate, stats)
 - `src/components/` — Reusable UI (ClauseCard, RiskIndicators, RatingWidget, LocaleSwitcher, HeroTypewriter)
-- `src/lib/` — Utilities, AI helpers, DB (sql.js for stats)
+- `src/lib/` — Utilities, AI helpers, DB (Redis for stats)
 - `src/i18n/` — next-intl config and messages
 - `messages/` — Locale JSON files (en, zh-CN)
 

package.json

@@ -21,7 +21,7 @@
     "openai": "6.25.0",
     "react": "19.2.3",
     "react-dom": "19.2.3",
-    "sql.js": "1.14.0",
+    "redis": "5.11.0",
     "tailwind-merge": "3.5.0",
     "typed.js": "3.0.0"
   },
@@ -38,7 +38,6 @@
     "eslint": "9.39.3",
     "eslint-config-next": "16.1.6",
     "postcss": "8.5.6",
-    "radis": "2.0.0",
     "tailwindcss": "4.2.1",
     "typescript": "5.9.3"
   }