Markers can have end time (#5311)

* Markers can have end time

Other metadata sources such as ThePornDB and timestamp.trade support end times for markers but Stash did not yet support saving those. This is a first step which only allows end time to be set either via API or via UI. Other aspects of Stash such as video player timeline are not yet updated to take end time into account.

- User can set end time when creating or editing markers in the UI or in the API.
- End time cannot be before start time. This is validated in the backend and for better UX also in the frontend.
- End time is shown in scene details view or markers wall view if present.
- GraphQL API does not require end_seconds.
---------
Co-authored-by: WithoutPants <53250216+WithoutPants@users.noreply.github.com>

internal/api/resolver_mutation_scene.go

@@ -655,6 +655,13 @@ func (r *mutationResolver) SceneMarkerCreate(ctx context.Context, input SceneMar
 	newMarker.PrimaryTagID = primaryTagID
 	newMarker.SceneID = sceneID
 
+	if input.EndSeconds != nil {
+		if err := validateSceneMarkerEndSeconds(newMarker.Seconds, *input.EndSeconds); err != nil {
+			return nil, err
+		}
+		newMarker.EndSeconds = input.EndSeconds
+	}
+
 	tagIDs, err := stringslice.StringSliceToIntSlice(input.TagIds)
 	if err != nil {
 		return nil, fmt.Errorf("converting tag ids: %w", err)
@@ -680,6 +687,13 @@ func (r *mutationResolver) SceneMarkerCreate(ctx context.Context, input SceneMar
 	return r.getSceneMarker(ctx, newMarker.ID)
 }
 
+func validateSceneMarkerEndSeconds(seconds, endSeconds float64) error {
+	if endSeconds < seconds {
+		return fmt.Errorf("end_seconds (%f) must be greater than or equal to seconds (%f)", endSeconds, seconds)
+	}
+	return nil
+}
+
 func (r *mutationResolver) SceneMarkerUpdate(ctx context.Context, input SceneMarkerUpdateInput) (*models.SceneMarker, error) {
 	markerID, err := strconv.Atoi(input.ID)
 	if err != nil {
@@ -695,6 +709,7 @@ func (r *mutationResolver) SceneMarkerUpdate(ctx context.Context, input SceneMar
 
 	updatedMarker.Title = translator.optionalString(input.Title, "title")
 	updatedMarker.Seconds = translator.optionalFloat64(input.Seconds, "seconds")
+	updatedMarker.EndSeconds = translator.optionalFloat64(input.EndSeconds, "end_seconds")
 	updatedMarker.SceneID, err = translator.optionalIntFromString(input.SceneID, "scene_id")
 	if err != nil {
 		return nil, fmt.Errorf("converting scene id: %w", err)
@@ -735,6 +750,26 @@ func (r *mutationResolver) SceneMarkerUpdate(ctx context.Context, input SceneMar
 			return fmt.Errorf("scene marker with id %d not found", markerID)
 		}
 
+		// Validate end_seconds
+		shouldValidateEndSeconds := (updatedMarker.Seconds.Set || updatedMarker.EndSeconds.Set) && !updatedMarker.EndSeconds.Null
+		if shouldValidateEndSeconds {
+			seconds := existingMarker.Seconds
+			if updatedMarker.Seconds.Set {
+				seconds = updatedMarker.Seconds.Value
+			}
+
+			endSeconds := existingMarker.EndSeconds
+			if updatedMarker.EndSeconds.Set {
+				endSeconds = &updatedMarker.EndSeconds.Value
+			}
+
+			if endSeconds != nil {
+				if err := validateSceneMarkerEndSeconds(seconds, *endSeconds); err != nil {
+					return err
+				}
+			}
+		}
+
 		newMarker, err := qb.UpdatePartial(ctx, markerID, updatedMarker)
 		if err != nil {
 			return err
@@ -749,7 +784,7 @@ func (r *mutationResolver) SceneMarkerUpdate(ctx context.Context, input SceneMar
 		}
 
 		// remove the marker preview if the scene changed or if the timestamp was changed
-		if existingMarker.SceneID != newMarker.SceneID || existingMarker.Seconds != newMarker.Seconds {
+		if existingMarker.SceneID != newMarker.SceneID || existingMarker.Seconds != newMarker.Seconds || existingMarker.EndSeconds != newMarker.EndSeconds {
 			seconds := int(existingMarker.Seconds)
 			if err := fileDeleter.MarkMarkerFiles(existingScene, seconds); err != nil {
 				return err