Shared market-data key
One key for the whole platform: every user's market data comes through it. Users set only their own broker key.
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The key is checked with the provider (a read-only request), and stored encrypted only if the provider accepts it. It is never shown again, only its last four characters. Changing it needs a code from your authenticator app. Core hosts started from environment variables do not use this key until run grants are built (issue #273).
Failover market-data key
A second provider the platform falls back to when the first goes silent or reports itself down. A host reads both when a run starts, so a change here applies from the next run, not to one already running.
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