i think it works

database.py

@@ -201,6 +201,15 @@ class Database:
             result.append((proj.name or proj.worktree, ws_names, has_workspaces))
         return sorted(result)
 
+    def get_session_counts_by_project(self) -> dict:
+        """Return a dict of project_id -> active session count."""
+        assert self.conn is not None
+        cursor = self.conn.cursor()
+        cursor.execute(
+            "SELECT project_id, COUNT(*) FROM session WHERE time_archived IS NULL GROUP BY project_id"
+        )
+        return {row[0]: row[1] for row in cursor.fetchall()}
+
     def get_session(self, session_id: str) -> Optional[Session]:
         """Get a single session by ID."""
         sessions = self.get_sessions(include_archived=True)