diff --git a/tests/unit/services/test_conventions_resolve.py b/tests/unit/services/test_conventions_resolve.py
index dbd81e65..65590e91 100644
--- a/tests/unit/services/test_conventions_resolve.py
+++ b/tests/unit/services/test_conventions_resolve.py
@@ -4,13 +4,15 @@ from __future__ import annotations
 
 import subprocess
 from types import SimpleNamespace
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, cast
 
 from roboco.services.conventions import ConventionsService
 
 if TYPE_CHECKING:
     from pathlib import Path
 
+    from roboco.db.tables import ProjectTable
+
 
 def _git_repo(root: Path) -> str:
     (root / "roboco" / "services").mkdir(parents=True)
@@ -37,7 +39,7 @@ def _svc() -> ConventionsService:
 def test_resolve_reads_clone_head_and_backfills(tmp_path: Path) -> None:
     sha = _git_repo(tmp_path)
     project = SimpleNamespace(workspace_path=None, head_commit=None, slug="p")
-    root, head = _svc()._resolve(project, tmp_path)
+    root, head = _svc()._resolve(cast("ProjectTable", project), tmp_path)
     assert root == tmp_path
     assert head == sha
     # The backfill: the resolved path + real HEAD are persisted on the project.
@@ -49,7 +51,7 @@ def test_resolve_non_git_path_keeps_persisted_head(tmp_path: Path) -> None:
     project = SimpleNamespace(
         workspace_path=str(tmp_path), head_commit="deadbeef", slug="p"
     )
-    _root, head = _svc()._resolve(project, None)
+    _root, head = _svc()._resolve(cast("ProjectTable", project), None)
     # A non-git legacy path must not clobber the persisted head_commit.
     assert head == "deadbeef"
     assert project.head_commit == "deadbeef"
@@ -57,7 +59,7 @@ def test_resolve_non_git_path_keeps_persisted_head(tmp_path: Path) -> None:
 
 def test_resolve_no_workspace_returns_none_root() -> None:
     project = SimpleNamespace(workspace_path=None, head_commit=None, slug="p")
-    root, head = _svc()._resolve(project, None)
+    root, head = _svc()._resolve(cast("ProjectTable", project), None)
     assert root is None
     assert head == "HEAD"