Function get_quanta_timestamp_ns

pub fn get_quanta_timestamp_ns(clock: &Clock) -> u64

Get high-precision monotonic timestamp using quanta Clock

WARNING: This returns nanoseconds since program start (monotonic time), NOT epoch time!

Use this for:

• Performance measurements and benchmarking
• Duration calculations
• Rate limiting windows
• Internal sequence numbers

DO NOT use this for:

• External API timestamps
• Database timestamps
• JWT token timestamps
• Log timestamps
• Any timestamp that needs to survive program restarts

For epoch timestamps, use get_timestamp_ns_result() instead.