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Normally a new catalog is created when you upgrade LR from one version, older, to a newer version.
This happened when LR 5 was retired and Adobe came out with LR 6/2015. It happened again with LR Classic CC V7.
Personally I don't allow LR to create any catalogs in the Default location which is in the Username profile folder then some subfolder under the Pictures folder.
This is the default for both OS X and Windows.
I've been using LR since V1 and have always store my catalog on my D: partition in a folder named for the version of LR that I am using and for the version of LR the catalog is for. Presently I have both LR 5 and LR Classic CC installed and have the catalog files for each in a folder called LR 5 Catalog and LR Classic CC Catalog.
When I installed LR C CC V7 it upgrade my LR 6/2015 catalog to work with LR C CC and added a number to it. I then created a Folder, as mentioned above, and Copied the upgraded catalog into that new folder. Then I change the name of the copied catalog to LR Classic Catalog and then opened LR. When LR opened I then selected to open a different catalog and point it to the Copied and renamed LR C CC catalog and then in the LR Preferences made sure LR was point to always open that copied and renamed catalog. I then deleted the original upgraded one that was in my LR 6/2015 catalog folder.
That is just how I've done this over the 10+ years I used LR. It works for me.
If for some reason you are seeing LR randomly create a new catalog and adding a number to it I have no idea why that is happening. It has never happened to me.
Are you suggesting I copy my catalog and change the name?
I'm suggesting you do what you think best. I was stating what I do. What you do is up to you.
I fine it easier to copy and rename the catalog file when a new version of LR comes out and updates the catalog. That way I know which catalog file works with each version of LR.
But as state in my last sentence I have never seen LR create a new catalog and add a number to the name unless it was when a new version of LR gets installed.