Update codeintel db package for worker
Created by: efritz
Add additional methods to teh codeintel db package that will be needed by the precise-code-intel-worker.
This partially implements https://github.com/sourcegraph/sourcegraph/issues/9965.
Created by: efritz
Add additional methods to teh codeintel db package that will be needed by the precise-code-intel-worker.
This partially implements https://github.com/sourcegraph/sourcegraph/issues/9965.