SQL logs before changes (using `#increment!`):

```sql
Bulkrax::ImporterRun Load (8.9ms)  SELECT  "bulkrax_importer_runs".* FROM "bulkrax_importer_runs" WHERE "bulkrax_importer_runs"."id" = $1 LIMIT $2  [["id", 1], ["LIMIT", 1]]
Bulkrax::ImporterRun Update All (2.5ms)  UPDATE "bulkrax_importer_runs" SET "processed_records" = COALESCE("processed_records", 0) + 1 WHERE "bulkrax_importer_runs"."id" = $1  [["id", 1]]
```

SQL logs after changes (using `#increment_counter`):

```sql
Bulkrax::ImporterRun Update All (6.5ms)  UPDATE "bulkrax_importer_runs" SET "processed_records" = COALESCE("processed_records", 0) + 1 WHERE "bulkrax_importer_runs"."id" = $1  [["id", 1]]
```

The `SELECT` statement serves no purpose since the `UPDATE` statement is
atomic

These columns (`processed_children` and `failed_children`) were renamed
in the RenameChildrenCountersToRelationships migration; they no longer
exist