HTTP 503. GitHub was unavailable, rate limited the request, or did not respond in time. This is not confirmation that repository access was revoked.

Wait before retrying. Use increasing delays if repeated refresh requests fail. If connection setup failed, start a new connection attempt because its authorization callback cannot be reused.

A failed refresh does not replace the previous revision or advance the last successful sync time. Reads remain blocked until a valid refresh succeeds. If the problem continues, contact support with the requestId.

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