Prevent FreeRADIUS from Writing to radpostauth Table

I'm running FreeRADIUS 3 on Red Hat Linux with a MySQL backend. I want FreeRADIUS to only read from the database-no writes-since I'm syncing it to another server for redundancy and using a separate interface to manage user accounts.

Everything works, but I see Access-Accept and Access-Reject entries being written to radpostauth. How can I stop this?

-Mike
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