fix(model): align rename extension detection

py/services/model_lifecycle_service.py

@@ -339,7 +339,7 @@ class ModelLifecycleService:
                 return suffix
 
         basename = os.path.basename(filename)
-        dot_index = basename.find(".")
+        dot_index = basename.rfind(".")
         if dot_index != -1:
             return basename[dot_index:]
 

tests/services/test_model_lifecycle_service.py

@@ -243,6 +243,48 @@ async def test_rename_model_preserves_extension(tmp_path: Path):
     assert payload["file_name"] == new_name
 
 
+@pytest.mark.asyncio
+async def test_rename_model_with_dotted_basename(tmp_path: Path):
+    old_name = "model.v1"
+    old_extension = ".gguf"
+    new_name = "renamed-model"
+
+    model_path = tmp_path / f"{old_name}{old_extension}"
+    model_path.write_bytes(b"content")
+
+    metadata_path = tmp_path / f"{old_name}.metadata.json"
+    metadata_payload = {
+        "file_name": old_name,
+        "file_path": model_path.as_posix(),
+    }
+    metadata_path.write_text(json.dumps(metadata_payload))
+
+    async def metadata_loader(path: str):
+        with open(path, "r", encoding="utf-8") as handle:
+            return json.load(handle)
+
+    scanner = DummyScanner()
+    metadata_manager = PassthroughMetadataManager()
+    service = ModelLifecycleService(
+        scanner=scanner,
+        metadata_manager=metadata_manager,
+        metadata_loader=metadata_loader,
+    )
+
+    result = await service.rename_model(
+        file_path=model_path.as_posix(),
+        new_file_name=new_name,
+    )
+
+    expected_main = tmp_path / f"{new_name}{old_extension}"
+    assert expected_main.exists()
+    assert result["new_file_path"] == expected_main.as_posix()
+    assert any(p.endswith(f"{new_name}{old_extension}") for p in result["renamed_files"])
+
+    saved_metadata = json.loads((tmp_path / f"{new_name}.metadata.json").read_text())
+    assert saved_metadata["file_name"] == new_name
+    assert saved_metadata["file_path"].endswith(f"{new_name}{old_extension}")
+
 @pytest.mark.asyncio
 async def test_delete_model_removes_gguf_file(tmp_path: Path):
     model_path = tmp_path / "model.gguf"