Function get_epoch_timestamp_ns

pub fn get_epoch_timestamp_ns() -> u64

Get epoch timestamp for external systems, APIs, and persistence

This returns nanoseconds since Unix epoch (January 1, 1970 UTC). Use this for any timestamp that needs to:

• Be stored in databases
• Be sent to external APIs
• Be used in JWT tokens
• Be logged for debugging
• Survive program restarts

Clock Error Behavior

When the system clock is broken (e.g., time went backwards):

• With panic-on-clock-error feature: Panics immediately for fail-fast behavior
• Without feature: Returns a sentinel value (u64::MAX - 1 second) to indicate error

Enable the feature for production HFT systems where incorrect timestamps are unacceptable.