Fix backtests and indicators

scripts/safe-migrate.sh

@@ -723,13 +723,13 @@ fi
         SCRIPT_SIZE=$(wc -l < "$MIGRATION_SCRIPT")
         echo "📄 Migration script contains $SCRIPT_SIZE lines"
         
-        # Show first 20 lines as preview
+        # Show last 20 lines as preview
         echo ""
-        echo "📋 PREVIEW (first 20 lines):"
+        echo "📋 PREVIEW (last 20 lines):"
         echo "----------------------------------------"
-        head -20 "$MIGRATION_SCRIPT" | sed 's/^/   /'
+        tail -20 "$MIGRATION_SCRIPT" | sed 's/^/   /'
         if [ "$SCRIPT_SIZE" -gt 20 ]; then
-            echo "   ... (showing first 20 lines of $SCRIPT_SIZE total)"
+            echo "   ... (showing last 20 lines of $SCRIPT_SIZE total)"
         fi
         echo "----------------------------------------"
         echo ""