feat: init rssKeeper - RSS 抓取、管理与检索系统

完整功能包括:
- FastAPI 后端 + SQLite + FTS5 全文搜索
- RSS 源管理、自动发现、OPML 导入导出
- 文章抓取、去重、分类、全文检索
- RSS 源健康度监控
- Vue 3 + Element Plus 暗色主题 Web UI
- 对外 REST API 供 AI 分析调用
- Docker + docker-compose 部署

backend/database.py

@@ -0,0 +1,89 @@
+"""数据库连接与初始化"""
+from sqlalchemy import create_engine, event
+from sqlalchemy.orm import sessionmaker, declarative_base
+from config import DATABASE_URL
+
+# SQLite 连接
+engine = create_engine(
+    f"sqlite:///{DATABASE_URL}",
+    connect_args={"check_same_thread": False},
+    echo=False,
+)
+
+# 启用 SQLite 外键约束
+@event.listens_for(engine, "connect")
+def set_sqlite_pragma(dbapi_conn, connection_record):
+    cursor = dbapi_conn.cursor()
+    cursor.execute("PRAGMA foreign_keys=ON")
+    cursor.close()
+
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+Base = declarative_base()
+
+
+def get_db():
+    """FastAPI 依赖注入用"""
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
+
+
+def init_db():
+    """初始化数据库表"""
+    from models import Feed, Article, FetchLog  # noqa
+
+    Base.metadata.create_all(bind=engine)
+    init_fts5()
+
+
+def init_fts5():
+    """初始化 FTS5 全文搜索虚拟表"""
+    conn = engine.raw_connection()
+    cursor = conn.cursor()
+
+    # 检查 FTS5 扩展是否可用
+    try:
+        cursor.execute("SELECT sqlite_compileoption_used('ENABLE_FTS5')")
+        has_fts5 = cursor.fetchone()[0]
+        if not has_fts5:
+            print("警告: SQLite 未启用 FTS5 扩展，全文搜索将不可用")
+            return
+    except Exception:
+        pass
+
+    # 创建 FTS5 虚拟表
+    cursor.execute("""
+        CREATE VIRTUAL TABLE IF NOT EXISTS articles_fts USING fts5(
+            title, content,
+            content='articles',
+            content_rowid='id'
+        )
+    """)
+
+    # 创建触发器，自动同步 articles 表到 FTS5
+    cursor.execute("""
+        CREATE TRIGGER IF NOT EXISTS articles_fts_insert AFTER INSERT ON articles BEGIN
+            INSERT INTO articles_fts(rowid, title, content)
+            VALUES (new.id, new.title, new.content);
+        END
+    """)
+    cursor.execute("""
+        CREATE TRIGGER IF NOT EXISTS articles_fts_delete AFTER DELETE ON articles BEGIN
+            INSERT INTO articles_fts(articles_fts, rowid, title, content)
+            VALUES ('delete', old.id, old.title, old.content);
+        END
+    """)
+    cursor.execute("""
+        CREATE TRIGGER IF NOT EXISTS articles_fts_update AFTER UPDATE ON articles BEGIN
+            INSERT INTO articles_fts(articles_fts, rowid, title, content)
+            VALUES ('delete', old.id, old.title, old.content);
+            INSERT INTO articles_fts(rowid, title, content)
+            VALUES (new.id, new.title, new.content);
+        END
+    """)
+
+    conn.commit()
+    cursor.close()
+    conn.close()