feat: 初始提交

backend/app/services/admin_setting_service.py

@@ -0,0 +1,27 @@
+from typing import Optional
+
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from ..models import AdminSetting
+from ..repositories.admin_setting_repository import AdminSettingRepository
+
+
+class AdminSettingService:
+    """管理员配置项服务，提供简单的 KV 操作。"""
+
+    def __init__(self, session: AsyncSession):
+        self.session = session
+        self.repo = AdminSettingRepository(session)
+
+    async def get(self, key: str, default: Optional[str] = None) -> Optional[str]:
+        value = await self.repo.get_value(key)
+        return value if value is not None else default
+
+    async def set(self, key: str, value: str) -> None:
+        record = await self.repo.get(key=key)
+        if record:
+            await self.repo.update_fields(record, value=value)
+        else:
+            setting = AdminSetting(key=key, value=value)
+            await self.repo.add(setting)
+        await self.session.commit()