feat: configure Railway deployment

Author: kronosapiens

.nvmrc

@@ -0,0 +1 @@
+22

README.md

@@ -27,7 +27,11 @@ Pushes to `main` automatically deploy after CI passes.
    - Click "New Project" → "Deploy from GitHub repo"
    - Select the `daimyo` repository
 
-2. **Set Environment Variables**
+2. **Add PostgreSQL Database**
+   - In Railway, click "New" → "Database" → "Add PostgreSQL"
+   - Railway will automatically set `DATABASE_URL` for your service
+
+3. **Set Environment Variables**
    - In Railway, go to your service → Variables
    - Add the following (see `backend/.env.example` for reference):
      ```
@@ -40,7 +44,6 @@ Pushes to `main` automatically deploy after CI passes.
      SENPAI_ROLE_ID=<role id>
      SENSEI_ROLE_ID=<role id>
      OHAYO_CHANNEL_ID=<channel id>
-     DATABASE_PATH=/data/daimyo.db
 
      # Reputation thresholds
      DECAY_WINDOW_DAYS=360
@@ -55,11 +58,6 @@ Pushes to `main` automatically deploy after CI passes.
      TYPEFULLY_API_KEY=<your typefully key>
      ```
 
-3. **Create Volume for Database**
-   - In Railway, click your service → Settings → Volumes
-   - Add a volume with mount path `/data`
-   - This persists the SQLite database across deployments
-
 4. **(Optional) GitHub Branch Protection**
    - Go to GitHub repo → Settings → Branches
    - Add rule for `main` branch

backend/README.md

@@ -17,7 +17,7 @@ Implements a reputation system where users earn roles (Kōhai → Senpai → Sen
 
 - **TypeScript** - Type-safe development
 - **Discord.js v14** - Discord bot framework
-- **SQLite (better-sqlite3)** - Local database with WAL mode
+- **PostgreSQL (postgres.js)** - Production database
 - **node-cron** - Scheduled decay checks
 
 ## Setup
@@ -84,8 +84,8 @@ KOHAI_ROLE_ID=your_kohai_role_id
 SENPAI_ROLE_ID=your_senpai_role_id
 SENSEI_ROLE_ID=your_sensei_role_id
 
-# Database
-DATABASE_PATH=./daimyo.db
+# Database (PostgreSQL connection URL)
+DATABASE_URL=postgresql://user:password@host:5432/daimyo
 
 # Reputation Thresholds (optional, defaults shown)
 DECAY_WINDOW_DAYS=360
@@ -122,7 +122,7 @@ pnpm start
 
 The bot will:
 
-- Initialize the SQLite database
+- Connect to PostgreSQL database
 - Connect to Discord
 - Fetch all guild members
 - Start listening for reactions
@@ -194,7 +194,7 @@ backend/
 │   │   ├── guildMemberAdd.ts
 │   │   └── messageReactionAdd.ts
 │   ├── services/          # Core business logic
-│   │   ├── database.ts    # SQLite queries
+│   │   ├── database.ts    # PostgreSQL queries
 │   │   ├── roleManager.ts # Discord role management
 │   │   ├── reputation.ts  # Promotion logic
 │   │   └── decay.ts       # Demotion logic
@@ -376,13 +376,13 @@ const reaction = createMockReaction('msg-1', 'author-1', 'dojo');
 
 #### Test Database
 
-Tests use in-memory SQLite databases for fast, isolated testing:
+Tests use PGlite (in-memory PostgreSQL) for fast, isolated testing:
 
 ```typescript
 import { createTestDatabase, insertTestReaction } from '__tests__/mocks/database';
 
-const db = createTestDatabase();
-insertTestReaction(db, 'msg-1', 'author-1', 'reactor-1', Role.Senpai);
+const db = await createTestDatabase();
+await insertTestReaction(db, 'msg-1', 'author-1', 'reactor-1', Role.Senpai);
 ```
 
 ### Manual Testing Checklist

backend/package.json

@@ -10,6 +10,7 @@
     "typecheck": "tsc --noEmit -p tsconfig.build.json",
     "start": "node dist/index.js",
     "deploy-commands": "tsx src/deploy-commands.ts",
+    "test-ohayo": "tsx src/test-ohayo.ts",
     "lint": "eslint .",
     "lint:fix": "eslint . --fix",
     "format": "prettier --write \"**/*.{ts,js,json,md}\"",
@@ -38,7 +39,6 @@
   "author": "",
   "license": "MIT",
   "dependencies": {
-    "better-sqlite3": "^12.5.0",
     "discord.js": "^14.25.1",
     "dotenv": "^17.2.3",
     "node-cron": "^4.2.1",
@@ -48,7 +48,6 @@
   },
   "devDependencies": {
     "@electric-sql/pglite": "^0.3.15",
-    "@types/better-sqlite3": "^7.6.13",
     "@types/jest": "^30.0.0",
     "@types/node": "^25.0.3",
     "@types/node-cron": "^3.0.11",