fix(sql): preserve leading tenant routing hints

Closes #5332

apps/desktop/src/lib/sql/sqlStatementRanges.ts

@@ -444,7 +444,8 @@ export function splitSqlStatementRanges(sql: string, databaseType?: DatabaseType
     }
     // Block comments consume until the closing */.
     if (ch === "/" && next === "*") {
-      if (statementStart === -1 && pendingHintStart === -1 && sql[i + 2] === "+") pendingHintStart = i;
+      const hintMarker = sql[i + 2];
+      if (statementStart === -1 && pendingHintStart === -1 && (hintMarker === "+" || hintMarker === "@")) pendingHintStart = i;
       const close = sql.indexOf("*/", i + 2);
       i = close === -1 ? len : close + 2;
       continue;