Fix history origin filter path and add regression tests

backend/tests/test_services/test_history_service.py

@@ -179,6 +179,19 @@ class TestListHistory:
         # 2 sshd bans for 1.2.3.4
         assert result.total == 2
 
+    async def test_origin_filter_selfblock(self, f2b_db_path: str) -> None:
+        """Origin filter should include only selfblock entries."""
+        with patch(
+            "app.services.history_service.get_fail2ban_db_path",
+            new=AsyncMock(return_value=f2b_db_path),
+        ):
+            result = await history_service.list_history(
+                "fake_socket", origin="selfblock"
+            )
+
+        assert result.total == 4
+        assert all(item.jail != "blocklist-import" for item in result.items)
+
     async def test_unknown_ip_returns_empty(self, f2b_db_path: str) -> None:
         """Filtering by a non-existent IP returns an empty result set."""
         with patch(