Você pode sincronizar novamente o trac com o repositório usando o trac-admin.
repository resync <repos> [rev]
Re-synchronize trac with repositories
When [rev] is specified, only that revision is synchronized. Otherwise, the
complete revision history is synchronized. Note that this operation can
take a long time to complete. If synchronization gets interrupted, it can
be resumed later using the 'sync' command.
To synchronize all repositories, specify "*" as the repository.