I need to find someone who can provide high quality de-duping services of Adobe Lightroom with over 46,000 photographs. (if there is a trusted plugin with minimal manual intervention - meaning I do not have to select every "winner" of a dupe check, I'll try it.) I have a mac.
You could try this: Lightroom Plugins - Duplicate Finder for Lightroom
It lets you search for duplicates based on certain criteria.
Or use an external application, like Snapselect or Photo Sweeper.
It's rarely a completely automated process, since duplicate photos are a different concept from duplicate files, and even then you've got issues like whether all three in a bracket are dupes, etc. And make sure you deal with the issue of not deleting the image that you've applied Lr adjustments to, or you lose those.
Then once you are done getting rid of the duplicate images stop Double or Triple importing the same images. If this is because you are using 2 or more cameras of the same make and model set the cameras up to record images with a different file naming starting sequence or different starting number like having one camera start with a 2-3-4 or 5 and the other using the 1 after the initial starting letters.