code: protected long saveChanges(ICommitChanges changes, IStringCanonicalizer canonicalizer) {
          long addedVE = 0;
  
          // All OK. Update vertex
          for (BitsyVertex vertex : changes.getVertexChanges()) {
              addedVE = saveVertex(addedVE, vertex, canonicalizer);
          }
  
          // Process the edges next
          for (BitsyEdge edge : changes.getEdgeChanges()) {
              addedVE = saveEdge(addedVE, edge, canonicalizer);
          }
  
          return addedVE;
      }
docs: load from DB (without increment option)