dsage stores a few files in SAGE_ROOT/.sage/dsage:
pubcert.pem and cacert.pem: the public and private keys the
server uses for SSL.
dsage_key.pub and dsage_key: the keys used for authenticating
the user.
db/: this contains the dsage database.
*.log files: logs generated by the server and workers.
tmp_worker_files/: workers store the jobs they
have processed here.
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