Name
svnadmin rmtxns — Delete transactions from a repository.
Synopsis
svnadmin rmtxns REPOS_PATH TXN_NAME...
Examples
Remove named transactions:
$ svnadmin rmtxns /var/svn/repos/ 1w 1x
Fortunately, the output of lstxns
            works great as the input for rmtxns:
$ svnadmin rmtxns /var/svn/repos/  `svnadmin lstxns /var/svn/repos/`
This removes all uncommitted transactions from
            your repository.