diff --git a/scripts/capture-baseline-post.ts b/scripts/capture-baseline-post.ts
new file mode 100644
index 0000000..9b08818
--- /dev/null
+++ b/scripts/capture-baseline-post.ts
@@ -0,0 +1,110 @@
+/**
+ * Post-Phase-1a Baseline Capture - diff-only helper
+ *
+ * Queries the renamed tables and writes post-rename JSON fixtures. After running,
+ * diff these against test-fixtures/baselines/*-pre-phase1.json to verify the
+ * rename did not change any data. DO NOT COMMIT THIS FILE OR ITS OUTPUT.
+ *
+ * Usage:
+ *   npx dotenv -- tsx scripts/capture-baseline-post.ts
+ */
+
+import { drizzle } from "drizzle-orm/postgres-js";
+import postgres from "postgres";
+import { sql } from "drizzle-orm";
+import { writeFileSync, mkdirSync } from "fs";
+import { join } from "path";
+import * as schema from "../database/schema.js";
+
+const OUT_DIR = join(process.cwd(), "test-fixtures", "baselines");
+
+async function main() {
+  const dbUrl = process.env.DATABASE_URL;
+  if (!dbUrl) {
+    console.error("ERROR: DATABASE_URL is required");
+    process.exit(1);
+  }
+
+  console.log("Connecting to database...");
+  const client = postgres(dbUrl, { max: 1 });
+  const db = drizzle(client, { schema });
+
+  mkdirSync(OUT_DIR, { recursive: true });
+  console.log(`Output directory: ${OUT_DIR}\n`);
+
+  // ─── 1. season_participant_qualifying_totals ──────────────────────────────────
+
+  console.log("Capturing season_participant_qualifying_totals...");
+  const qpTotals = await db.execute(sql`
+    SELECT pqt.*, ss.id as sports_season_id, ss.name as sports_season_name, s.name as sport_name
+    FROM season_participant_qualifying_totals pqt
+    JOIN sports_seasons ss ON ss.id = pqt.sports_season_id
+    JOIN sports s ON s.id = ss.sport_id
+    WHERE ss.scoring_pattern = 'qualifying_points'
+    ORDER BY ss.id, pqt.participant_id
+  `);
+
+  writeFileSync(
+    join(OUT_DIR, "qp-totals-post-phase1a.json"),
+    JSON.stringify(qpTotals, null, 2)
+  );
+  console.log(`  Wrote ${qpTotals.length} rows → qp-totals-post-phase1a.json`);
+
+  // ─── 2. event_results with qualifying_points_awarded ─────────────────────────
+
+  console.log("Capturing event_results with qualifying_points_awarded...");
+  const eventResults = await db.execute(sql`
+    SELECT er.*, se.sports_season_id, se.name as event_name
+    FROM event_results er
+    JOIN scoring_events se ON se.id = er.scoring_event_id
+    JOIN sports_seasons ss ON ss.id = se.sports_season_id
+    WHERE ss.scoring_pattern = 'qualifying_points'
+      AND er.qualifying_points_awarded IS NOT NULL
+    ORDER BY se.sports_season_id, er.scoring_event_id, er.season_participant_id
+  `);
+
+  writeFileSync(
+    join(OUT_DIR, "event-results-post-phase1a.json"),
+    JSON.stringify(eventResults, null, 2)
+  );
+  console.log(`  Wrote ${eventResults.length} rows → event-results-post-phase1a.json`);
+
+  // ─── 3. season_participant_surface_elos ──────────────────────────────────────
+
+  console.log("Capturing season_participant_surface_elos...");
+  const surfaceElos = await db.execute(sql`
+    SELECT pse.*, ss.sport_id, ss.name as sports_season_name, s.name as sport_name
+    FROM season_participant_surface_elos pse
+    JOIN sports_seasons ss ON ss.id = pse.sports_season_id
+    JOIN sports s ON s.id = ss.sport_id
+    WHERE ss.scoring_pattern = 'qualifying_points'
+    ORDER BY ss.id, pse.participant_id
+  `);
+
+  writeFileSync(
+    join(OUT_DIR, "surface-elos-post-phase1a.json"),
+    JSON.stringify(surfaceElos, null, 2)
+  );
+  console.log(`  Wrote ${surfaceElos.length} rows → surface-elos-post-phase1a.json`);
+
+  console.log(`\n✓ Post-rename capture complete!`);
+  console.log(`  ${qpTotals.length} QP totals`);
+  console.log(`  ${eventResults.length} event results`);
+  console.log(`  ${surfaceElos.length} surface elo rows`);
+  console.log(`\nNow diff against the pre-phase1 fixtures:`);
+  console.log(`  diff <(jq -S . test-fixtures/baselines/qp-totals-pre-phase1.json) \\`);
+  console.log(`       <(jq -S . test-fixtures/baselines/qp-totals-post-phase1a.json)`);
+  console.log(`  diff <(jq -S . test-fixtures/baselines/surface-elos-pre-phase1.json) \\`);
+  console.log(`       <(jq -S . test-fixtures/baselines/surface-elos-post-phase1a.json)`);
+  console.log(`  diff <(jq -S 'map(del(.participant_id))' test-fixtures/baselines/event-results-pre-phase1.json) \\`);
+  console.log(`       <(jq -S 'map(del(.season_participant_id))' test-fixtures/baselines/event-results-post-phase1a.json)`);
+
+  await client.end();
+}
+
+main()
+  .then(() => process.exit(0))
+  .catch((e) => {
+    console.error("FATAL:", e);
+    process.exit(1);
+  });