diff --git a/tests/test_api_images.py b/tests/test_api_images.py
index 0775bcb1..edb3c363 100644
--- a/tests/test_api_images.py
+++ b/tests/test_api_images.py
@@ -35,6 +35,7 @@ from aiohttp import web  # noqa: E402
 from aiohttp.test_utils import AioHTTPTestCase  # noqa: E402
 from PIL import Image  # noqa: E402
 
+from database.models import PromptModel  # noqa: E402
 from database.operations import PromptDatabase  # noqa: E402
 import py.api.images as images_module
 from py.api import gallery_listing  # noqa: E402
@@ -92,14 +93,41 @@ class ImageAPITestCase(AioHTTPTestCase):
         self._anchor_patch.stop()
         # Windows refuses to unlink a database that still has open handles.
         self.api.db.close_all()
-        for path in (
-            self._temp_db.name,
-            self._temp_db.name + "-wal",
-            self._temp_db.name + "-shm",
-        ):
-            if os.path.exists(path):
-                os.unlink(path)
-        self._output_tmp.cleanup()
+        try:
+            leaked = self._close_leaked_connections()
+        finally:
+            for path in (
+                self._temp_db.name,
+                self._temp_db.name + "-wal",
+                self._temp_db.name + "-shm",
+            ):
+                if os.path.exists(path):
+                    os.unlink(path)
+            self._output_tmp.cleanup()
+        if leaked:
+            raise AssertionError(
+                f"{leaked} connection(s) to the test database were still open at "
+                "teardown; Windows cannot unlink it (WinError 32). Close every "
+                "extra PromptDatabase before tearDownAsync, not in a cleanup."
+            )
+
+    def _close_leaked_connections(self):
+        """Close and count connections other models still hold on the temp DB.
+
+        Linux unlinks an open SQLite file, Windows does not; counting here makes
+        a handle left open past teardown fail on every OS (#475).
+        """
+        key = os.path.normcase(os.path.realpath(self._temp_db.name))
+        with PromptModel._instances_lock:
+            models = list(PromptModel._instances)
+        leaked = 0
+        for model in models:
+            if model._schema_key() != key:
+                continue
+            with model._conn_lock:
+                leaked += len(model._connections)
+            model.close_all()
+        return leaked
 
     # -- helpers ---------------------------------------------------------
 
diff --git a/tests/test_api_workspace_restart.py b/tests/test_api_workspace_restart.py
index d975c640..d2c80bad 100644
--- a/tests/test_api_workspace_restart.py
+++ b/tests/test_api_workspace_restart.py
@@ -38,11 +38,25 @@ def _payload(token):
 
 class TestRestartKeepsTheOpenPage(ImageAPITestCase):
     async def get_application(self):
+        self._restarts = []
         app = await super().get_application()
         for index in range(3):
             make_png(self.output_dir / f"image_{index}.png")
         return app
 
+    async def tearDownAsync(self):
+        # Before the base teardown unlinks the database: cleanups run after
+        # tearDownAsync, and Windows cannot unlink a file still open (#475).
+        errors = []
+        while self._restarts:
+            try:
+                await self._restarts.pop()()
+            except Exception as error:  # every closer runs; the first error wins
+                errors.append(error)
+        await super().tearDownAsync()
+        if errors:
+            raise errors[0]
+
     async def first_page(self, client=None, **params):
         response = await (client or self.client).get(
             LISTING, params={"mode": "workspace", "limit": "1", **params}
@@ -67,7 +81,7 @@ class TestRestartKeepsTheOpenPage(ImageAPITestCase):
             api.close_auto_thumbnails()
             api.db.close_all()
 
-        self.addAsyncCleanup(close)
+        self._restarts.append(close)
         return api, client
 
     async def test_a_restart_keeps_every_held_scope_and_cursor_valid(self):
@@ -152,8 +166,13 @@ class TestRestartKeepsTheOpenPage(ImageAPITestCase):
         other_db = self.comfy_dir / "elsewhere" / "prompts.db"
         other_db.parent.mkdir()
         api = PromptManagerAPI(db=PromptDatabase(str(other_db)))
-        self.addCleanup(api.db.close_all)
-        self.addCleanup(api.close_auto_thumbnails)
+
+        async def close():
+            api.close_auto_thumbnails()
+            api.db.close_all()
+
+        # Closed before teardown removes the folder that holds its database.
+        self._restarts.append(close)
         self.assertNotEqual(
             api._gallery_root_scope(self.output_dir, 0), page["images"][0]["root_scope"]
         )