ASP.NET Data Protection ciphertext is non-deterministic and bound to the
source key ring, so encrypted secret columns (ExternalSystemDefinitions
.AuthConfiguration, SmtpConfigurations.Credentials, DatabaseConnection
Definitions.ConnectionString) cannot be replayed from a static SQL dump —
the app would fail to decrypt them. dump_seed.py now emits those columns
as NULL; reseed.sh adds a post-seed stage that recreates the values
through the ScadaLink CLI so the EF value converter re-encrypts against
the target cluster's key ring.
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