ctr

The two reported Snowflake SQL-screen warmups. Both look trivial; both have a silent-failure trap, integer division and divide-by-zero in one, the EXTRACT(MONTH) year-collision in the other.

This model's output is not a ranking, it is a price input. A miscalibrated CTR makes the auction bid wrong, so you overpay or underdeliver. Add conversions that land days after the click and advertisers with zero history, and calibration plus delayed feedback become the whole interview.