diff --git a/src/services/statcastAggregateService.js b/src/services/statcastAggregateService.js
index afa98d3..9b84727 100644
--- a/src/services/statcastAggregateService.js
+++ b/src/services/statcastAggregateService.js
@@ -272,14 +272,13 @@ async function refreshSeason(opts = {}) {
     const asOf = (opts.asOfDate || started).slice(0, 10);
     let retained = 0;
     for (let i = 0; i < rows.length; i += chunk) {
-      const batch = rows.slice(i, i + chunk).map((r) => {
-        const row = toDbRow(r);
-        delete row.updated_at; delete row.source;
-        delete row.position; delete row.role_detail;
-        delete row.games_started; delete row.games_pitched;
-        delete row.saves; delete row.holds;
-        return { ...row, as_of_date: asOf };
-      });
+      // The history table MIRRORS statcast_aggregates (created via LIKE), so the
+      // row goes in whole. The first prod attempt hand-stripped columns against a
+      // hand-enumerated schema and failed on the first one that had drifted
+      // ('swing_pct'); passing the same shape through removes the drift surface
+      // entirely. `updated_at` rides along as the refresh timestamp; `as_of_date`
+      // is the day the snapshot describes and is what point-in-time queries use.
+      const batch = rows.slice(i, i + chunk).map((r) => ({ ...toDbRow(r), as_of_date: asOf }));
       const { error } = await sb.from('statcast_history')
         .upsert(batch, { onConflict: 'as_of_date,sport,season,source_id,role' });
       if (error) { summary.history_error = error.message; break; }