Initial LinkLog implementation

backend/app/models/link.py

@@ -0,0 +1,17 @@
+from dataclasses import dataclass, field
+from datetime import datetime
+from typing import Optional
+
+
+@dataclass
+class LinkRecord:
+    id: str
+    user_id: str
+    title: str
+    url: str
+    comment: str
+    created_at: datetime
+    timestamp: Optional[datetime] = None
+    is_public: bool = True
+    updated_at: Optional[datetime] = None
+    deleted_at: Optional[datetime] = None