racer | A racing game/simulator concept | Game Engine library

I have this model:

I've database of users where they have created their team. and other document for storing racers.

each user can create a team of 6 racers.

but the problem is that I've 50k users and using the below code to remove a racer from their team if Admin deleted it from Racers Document.

I'm using express.js and mongoose

team is an array of object which has racers name, it's shortCode and unique identifier.

I need to render a list of products from the data stored in an object with a react router v6. I typed the object and created the typed function to get the value of a key following what is taught in this github answer. This eliminated the previous error of Argument of type 'string' is not assignable to parameter of type 'never' ts(2345), but a new error appeared: Argument of type 'string' is not assignable to parameter of type ' never' ts(2345), which is pointed to the slug parameter of the getKeyValue call in the constant in the line const shoe = getKeyValue(slug)(shoes);.

I was learnning Akka Typed Actor library and tried to send a message to all child actors of a particular actor, using this.getContext().getChildren(). But it returns a Void type and not the type I initially created the child actors with -> hence I could not send any type of message to the children.

The workaround I did is to simply store the children in a hashmap at the time of creation. But this is not a scalable one.

How can I achieve this? especially under distributed scenario?

I need to update/reverse two inputs from drop down inputs upon a button press. At the moment when I hit the swap button (reverse_xz), it reacts however the updatePickerInput doesn't switch my x and z inputs.

I wanted to have the functionality where, once the swap button is clicked, switch the already selected pickerInputs. Then, all the drop down choices (including the selected) need to get reversed. The reason we have to remove the selected choices from vector is to prevent duplicate selections in both x and z inputs.

I am not sure if I have to render the pickerInput ui on the server side?!

This is my code below:

I have a dictionary which contains some racers as shown below:

I am trying to read below json schema to dataframe, i can convert it to my preferred type by iterating over all nodes but it can take a while because original json files is much longer then this example. (in tens of thousands)

I'm using Firebase to load images onto a Flutter Map as CircleAvatar with CachedNetworkImage. The problem is that the images "dance" around or reload other images when I move the map around. I don't understand why other images will sometimes show in the spot where the image loads at. This is more obvious on mobile browser than on a desktop. How do I make it so that if the images need to be redrawn that they don't temporarily load another image into it for what is a microsecond. I don't understand if the cause of this is how I have my firebase query written or if this is a problem with the way the image values are stored in flutter. Example page and code linked below. What do I do to stop the images from doing this flickering or reloading?

My example page is linked here.

I'm creating a turtle race and I want to make a turtle stop when it hits the finish line.

The circled portion is the finish line and is at the x coordinate 220. This is my code so far: