Key Count Reconciliation
Before publishing the load, compare volumes: how many unique src_id values arrived in stg_users, and how many rows are currently in dim_users. Return one row with stg_keys and dim_keys.
Expected output sample
This is what a correct answer looks like — its row count is its own, it doesn't have to match the schema tables.
| dim_keys | stg_keys |
|---|---|
| 3 | 4 |
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