Brainstorm initial API and modify db to be more FUSE friendly

trovedb/tree.py

@@ -15,8 +15,8 @@ class Tree:
         Initialize a Tree. If data is provided, deserialize from UTF-8 JSON bytes.
         An empty Tree is created if data is None.
         """
-        if data is None:
-            self._entries: dict[str, str] = {}
+        if not data:
+            self._entries: dict[str, int] = {}
         else:
             self._entries = json.loads(data.decode("utf-8"))
 
@@ -24,14 +24,18 @@ class Tree:
         """Serialize the tree to UTF-8 JSON bytes."""
         return json.dumps(self._entries).encode("utf-8")
 
-    def set_entry(self, name: str, uuid: str) -> None:
+    def set_entry(self, name: str, object_id: int) -> None:
         """Add or update an entry mapping name -> uuid."""
-        self._entries[name] = uuid
+        self._entries[name] = object_id
+
+    def get_entry(self, name: str) -> int:
+        """Get the uuid associated with a name, or raise KeyError if not found."""
+        return self._entries[name]
 
     def rm_entry(self, name: str) -> None:
         """Remove an entry by name. Raises KeyError if not found."""
         del self._entries[name]
 
-    def list(self) -> dict[str, str]:
+    def list(self) -> dict[str, int]:
         """Return a shallow copy of all entries as {name: uuid}."""
         return dict(self._entries)