Revert "Add bac"

This reverts commit ed688dcfc33bb4a694e929f825fa1fa91841dee6.
Revert "Fix context in query success"

This reverts commit ad91e737a0283fafb95d5223f4457f8a2f879bbe.
Revert "Add back-end search"

This reverts commit 31a1b156a45727ea038ed3d519896cd306ec23d1.