> cat stations_rules.yaml
source:
  path: stations_idl.csv
target:
  path: stations_python.csv
primary_keys: [station, obs_date]
rules:
  - column_names: [temp]
    rename_to: temperature_c
  - column_names: [humidity]
    relative_tolerance: 5.0e-08
    null_values: [-999.0]
> veridelta run -c stations_rules.yaml
Loading configuration from stations_rules.yaml...
Comparing...

Veridelta Execution Summary
===========================
Status:        FAILED
Match Rate:    71.77%
Source Rows:   124
Target Rows:   124
Volume Shift:  +0 rows

Row-Level Discrepancies:
---------------------------
Added:         0
Removed:       0
Changed:       35
Total Issues:  35

Top Column-Level Drifts:
---------------------------
- pressure_hpa: 31 mismatches
- temperature_c: 4 mismatches

> echo "exit code: $?"
exit code: 1
