Adds end-to-end procedure for moving production back from DR (10.0.20.37)
to a repaired/reinstalled PRIMARY (10.0.20.36): final RMAN backup on DR
in restricted/read-only mode, RMAN restore on PRIMARY, app connection
switch, scheduled-task reactivation, VM 109 stop. Companion PowerShell
script handles the restore with sanity checks (IP, NFS, backup freshness)
and aborts if Oracle major version != 19, since failback to 21c would
need an extra dictionary upgrade step (~30-60 min) that adds untested
risk during the critical window — recommended path is 19c failback then
upgrade later in a planned window.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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