Replace fixed DSL fields with parameterized metric expressions

tests/test_analysis_workspace.py

@@ -324,10 +324,10 @@ def test_previous_year_comparison(app):
         "runs\nsummarize pace\nchart stacked",
         "runs\nsummarize pace\ncolor by distance",
         "runs\nsummarize pace\nreference heart_rate = 150 bpm",
-        "segments\nsummarize rolling_7d_distance",
+        "segments\nsummarize rolling_sum(distance, 7 days)",
         "runs\nlet bad = rolling_mean(password, 10 days)\nsummarize bad",
     ],
 )
 def test_invalid_analysis_features(source):
     with pytest.raises(QueryError):
-        parsed(source)
+        parsed(source)