添加n8n流程

.gitignore

@@ -4,3 +4,7 @@
 *.log
 data/
 backups/
+
+# n8n runtime secret and persistent data
+n8n/.env
+n8n/data/

n8n/.env.example

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+# n8n instance secret. Generate once with: openssl rand -hex 32
+# Do not change this value after n8n has stored credentials.
+N8N_ENCRYPTION_KEY=
+
+# Initial access is through an SSH tunnel, so keep n8n on localhost.
+N8N_HOST=127.0.0.1
+N8N_PORT=5678
+N8N_LISTEN_ADDRESS=127.0.0.1
+N8N_PROTOCOL=http
+N8N_EDITOR_BASE_URL=http://127.0.0.1:5678
+N8N_SECURE_COOKIE=false
+
+TZ=Asia/Shanghai
+GENERIC_TIMEZONE=Asia/Shanghai

n8n/README.md

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+# n8n deployment
+
+This directory runs n8n separately from the news web service. The n8n data
+directory and `.env` stay on the server and must not be committed to Gitea.
+
+## First deployment on the server
+
+```bash
+cd /projects/daily-news-digest/n8n
+cp .env.example .env
+openssl rand -hex 32
+nano .env
+chmod 600 .env
+mkdir -p data
+sudo chown -R 1000:1000 data
+docker compose up -d
+docker compose ps
+docker compose logs --tail=50 n8n
+```
+
+The generated value must be copied to `N8N_ENCRYPTION_KEY` and must not be
+changed later. n8n listens only on the server's loopback address. From a local
+computer, create an SSH tunnel and open `http://127.0.0.1:5678`:
+
+```powershell
+ssh -L 5678:127.0.0.1:5678 root@YOUR_SERVER_IP
+```
+
+## Updating from Gitea
+
+```bash
+cd /projects/daily-news-digest
+git pull
+cd n8n
+docker compose up -d
+```
+
+Do not overwrite `n8n/.env` or `n8n/data` during updates.
+
+## PostgreSQL credential
+
+In n8n, create a PostgreSQL credential for the existing application database.
+Because n8n uses host networking and PostgreSQL is on the same host, use the
+host's local PostgreSQL address (`127.0.0.1`), port `5432`, your database/user/
+password, and disable SSL when the server reports that it does not support SSL.
+
+The first workflow in `workflows/01-test-postgres.json` only checks this
+connection. It does not fetch news or send email.

n8n/docker-compose.yml

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+services:
+  n8n:
+    image: docker.n8n.io/n8nio/n8n:latest
+    restart: unless-stopped
+    network_mode: host
+    env_file:
+      - .env
+    volumes:
+      - ./data:/home/node/.n8n

n8n/workflows/01-test-postgres.json

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+{
+  "name": "Daily News Digest - Test PostgreSQL",
+  "nodes": [
+    {
+      "parameters": {},
+      "id": "manual-trigger",
+      "name": "手动执行",
+      "type": "n8n-nodes-base.manualTrigger",
+      "typeVersion": 1,
+      "position": [260, 300]
+    },
+    {
+      "parameters": {
+        "operation": "executeQuery",
+        "query": "SELECT current_database() AS database_name, NOW() AS checked_at, (SELECT COUNT(*) FROM news_sources) AS source_count, (SELECT COUNT(*) FROM news_articles) AS article_count;",
+        "options": {}
+      },
+      "id": "postgres-check",
+      "name": "检查新闻数据库",
+      "type": "n8n-nodes-base.postgres",
+      "typeVersion": 2.5,
+      "position": [520, 300]
+    }
+  ],
+  "connections": {
+    "手动执行": {
+      "main": [
+        [
+          {
+            "node": "检查新闻数据库",
+            "type": "main",
+            "index": 0
+          }
+        ]
+      ]
+    }
+  },
+  "active": false,
+  "settings": {},
+  "versionId": "daily-news-digest-test-postgres-v1",
+  "meta": {
+    "templateCredsSetupCompleted": false
+  },
+  "pinData": {},
+  "tags": []
+}