Fix to ensure unique document IDs when batch reports are generated

internal/report/daily_report.go

@@ -22,6 +22,7 @@ func dailyDefinition() Definition {
 		CompatiblePriorIDs:    []ID{Daily},
 		Modules:               dailyModules(),
 		resolve:               resolveDaily,
+		runIDDisambiguator:    validStartDateRunIDDisambiguator,
 	}
 }
 
@@ -50,3 +51,14 @@ func resolveDaily(req ResolveRequest) (timeutil.Period, error) {
 	}
 	return timeutil.CivilDay(req.Date, req.Location), nil
 }
+
+func validStartDateRunIDDisambiguator(resolved Resolved) string {
+	if resolved.ValidPeriod.Start.IsZero() {
+		return ""
+	}
+	location, err := timeutil.LoadLocation(resolved.Timezone)
+	if err != nil {
+		return resolved.ValidPeriod.Start.Format(timeutil.DateLayout)
+	}
+	return resolved.ValidPeriod.Start.In(location).Format(timeutil.DateLayout)
+}