[FIX] Add pipeline_starttime to bagel file (nipoppy#286)

* test for model field names

* add `pipeline_starttime` column to bagel

nipoppy_cli/nipoppy/tabular/bagel.py

@@ -50,6 +50,10 @@ class BagelModel(BaseTabularModel):
     pipeline_complete: str = Field(
         description="The status of the pipeline run for this participant-visit pair"
     )
+    # this is needed for now for the dashboard for work, but should be removed
+    # if https://github.com/neurobagel/digest/issues/153 is addressed
+    # TODO discuss bagel schema
+    pipeline_starttime: str = Field(default="UNAVAILABLE")
 
     @field_validator("pipeline_complete")
     @classmethod

nipoppy_cli/tests/test_tabular_bagel.py

@@ -27,7 +27,17 @@
     ],
 )
 def test_model(data):
-    BagelModel(**data)
+    bagel = BagelModel(**data)
+    assert set(bagel.model_fields.keys()) == {
+        Bagel.col_participant_id,
+        Bagel.col_bids_participant,
+        Bagel.col_session_id,
+        Bagel.col_pipeline_name,
+        Bagel.col_pipeline_version,
+        Bagel.col_pipeline_complete,
+        "session",
+        "pipeline_starttime",
+    }
 
 
 @pytest.mark.parametrize(