My understanding of the ruins issue is that if you have researched the technology the ruin would have given you, you get nothing upon finding the ruin. Sounds simple, and I believe that is the way it works.
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"We've made too many compromises already, too many retreats! They invade our space and we fall back -- they assimilate entire worlds and we fall back! Not again! The line must be drawn here -- this far, no further! And I will make them pay for what they've done!" -- Patric Stewart as Captain Picard
UCP/TCO Ship Yards