Add a new field to the alert schema to fix a mismatch between the prior schema and the upstream NWS API

internal/sinks/postgres/schema_test.go

@@ -91,6 +91,15 @@ func TestWeatherPostgresSchemaIncludesOutlookTables(t *testing.T) {
 	assertTableUniqueIndex(t, tableOutlookDiscussions, "idx_wf_outlook_discussions_run_day", []string{"run_event_id", "day"})
 }
 
+func TestWeatherPostgresSchemaIncludesAlertEndsColumn(t *testing.T) {
+	alertColumns := columnsForTable(t, tableAlerts)
+	for _, col := range []string{"run_event_id", "alert_index", "as_of", "alert_id", "onset", "ends", "expires"} {
+		if !alertColumns[col] {
+			t.Fatalf("%s missing %s column", tableAlerts, col)
+		}
+	}
+}
+
 func TestWeatherPostgresSchemaIncludesWeatherStoryColumns(t *testing.T) {
 	runColumns := columnsForTable(t, tableWeatherStoryRuns)
 	if !runColumns["as_of"] {