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Can the repair barge ability bring back necrons in a squad that is in melee?

Oddly, the Ghost Ark doesn't seem to say exactly how you're meant to add models to the unit (as opposed to, say, Reanimation Protocols).

Common sense would suggest that they should be placed at least in coherency, but no mention is made of a distance away from enemy models (RP does mention both coherency and distance from enemy models). No restriction on the unit being un-engaged exists, so it should work as normal for a Necron unit in combat.

You can bring back models that are in close combat, as you have permission to add models to the unit

I would suggest, as the rule is terribly written (see the large thread on exactly *what* the GB can bring back for proof!) that you bring models back in coherency, following RP rules as a guidance.