More timestamp corrections (#2933)

* Fix incorrect timestamp updates
* Correct folder time fields
* Add migration with new indexes
* Correct mod_time format
* Add mod_time to data massage

pkg/sqlite/image.go

@@ -89,8 +89,8 @@ func (r *imageRowRecord) fromPartial(i models.ImagePartial) {
 	r.setBool("organized", i.Organized)
 	r.setInt("o_counter", i.OCounter)
 	r.setNullInt("studio_id", i.StudioID)
-	r.setTime("created_at", i.CreatedAt)
-	r.setTime("updated_at", i.UpdatedAt)
+	r.setSQLiteTimestamp("created_at", i.CreatedAt)
+	r.setSQLiteTimestamp("updated_at", i.UpdatedAt)
 }
 
 type ImageStore struct {