Function parse_ttl_to_secs 

pub fn parse_ttl_to_secs(ttl: &str) -> Result<u64>

Parse a TTL string (e.g. “30m”, “1h”, “5m”, “2h30m”) to seconds.

Supports:

• Ns — seconds
• Nm — minutes
• Nh — hours
• plain integer — treated as seconds