I've used TortoiseSVN for several years.
Several branches were created, merged back to trunk, and then deleted.
Example of deleted branches:
https://SvnServer/svn/MyProject/branches/branch1 https://SvnServer/svn/MyProject/branches/branch2 https://SvnServer/svn/MyProject/branches/branch3
The svn:mergeinfo of the trunk (https://SvnServer/svn/MyProject/trunk) still contains those merge tracking info for those deleted branches.
Example of svn:mergeinfo:
/branches/branch1:2106-2146
/branches/branch2:1983-2028
/branches/branch3:1698-1741
Are these info still necessary? Can I remove them from svn:mergeinfo property?