fix(test): stream large report snapshot SQL

Co-Authored-By: Claude Code <noreply@anthropic.com>

frontend/tests/postgres-fixture-contract.test.ts

@@ -33,3 +33,12 @@ test("postgres fixture start failure and stop both release the compose-network s
     /stop\(\) \{[\s\S]*releasePort\(portReservation\)[\s\S]*slot\.release\(\)/,
   );
 });
+
+test("large PostgreSQL scripts use stdin without changing shared -c helpers", () => {
+  assert.match(fixtureSource, /psqlScriptAs\(role, password, sql\)/);
+  assert.match(fixtureSource, /psqlScriptAs[\s\S]*input: sql/);
+  assert.match(fixtureSource, /psqlScriptAs[\s\S]*maxBuffer: 16 \* 1024 \* 1024/);
+  assert.match(fixtureSource, /psqlScriptAs[\s\S]*"--single-transaction"[\s\S]*"-f"[\s\S]*"-"/);
+  assert.match(fixtureSource, /psql\(sql\)[\s\S]*"-Atc",\s*sql/);
+  assert.match(fixtureSource, /psqlAs\(role, password, sql\)[\s\S]*"-Atc",\s*sql/);
+});