Mark the nodes and edges indices UNIQUE
Mark the nodes and edges indices UNIQUE

We never attempt to insert duplicate values, but this is useful
as an integrity check.

LeMagnesium/cobe,pteichman/cobe,meska/cobe,pteichman/cobe,wodim/cobe-ng,wodim/cobe-ng,meska/cobe,DarkMio/cobe,DarkMio/cobe,LeMagnesium/cobe,tiagochiavericosta/cobe,tiagochiavericosta/cobe