drop the get_earliest_issue_from_metadata

Author: zhuoran-Cheng16

src/acquisition/covidcast/signal_dash_data_generator.py

@@ -184,13 +184,6 @@ def get_latest_issue_from_metadata(dashboard_signal, metadata):
     max_issue = df_for_source["max_issue"].max()
     return pd.to_datetime(str(max_issue), format="%Y%m%d").date()
 
-def get_earliest_issue_from_metadata(dashboard_signal, metadata):
-    """Get the least recent issue date for the signal."""
-    df_for_source = metadata[(metadata.data_source == dashboard_signal.source) & (
-        metadata.signal == dashboard_signal.covidcast_signal)]
-    min_issue = df_for_source["min_issue"].min()
-    return pd.to_datetime(str(min_issue), format="%Y%m%d").date()
-
 
 def get_latest_time_value_from_metadata(dashboard_signal, metadata):
     """Get the most recent date with data for the signal."""

tests/acquisition/covidcast/test_signal_dash_data_generator.py

@@ -20,7 +20,6 @@
   DashboardSignalCoverage,
   DashboardSignal,
   get_latest_issue_from_metadata,
-  get_earliest_issue_from_metadata,
   get_latest_time_value_from_metadata,
   get_coverage
  )
@@ -168,20 +167,6 @@ def test_get_latest_issue_from_metadata(self):
         issue_date = get_latest_issue_from_metadata(signal, metadata)
         self.assertEqual(issue_date, date(2021, 1, 1))
 
-    def test_get_earliest_issue_from_metadata(self):
-        signal = DashboardSignal(
-            db_id=1, name="Change", source="chng",
-            covidcast_signal="chng-sig",
-            latest_coverage_update=date(2020, 1, 1),
-            latest_status_update=date(2020, 1, 1))
-        data = [['chng', 'chng-sig', 20200101],
-                ['chng', 'chng-sig', 20210101],
-                ['quidel', 'quidel-sig', 20220101]]
-        metadata = pd.DataFrame(data, columns=['data_source', 'signal', 'min_issue'])
-
-        issue_date = get_earliest_issue_from_metadata(signal, metadata)
-        self.assertEqual(issue_date, date(2020, 1, 1))
-            
     def test_get_latest_time_value_from_metadata(self):
         signal = DashboardSignal(
             db_id=1, name="Change", source="chng",