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hey! You'll need to define a specific type of RDS database. Only Aurora Serverless databases will be scalable. You can define the options using this:
<https://www.pulumi.com/docs/reference/pkg/aws/rds/cluster/#clusterscalingconfiguration>

minSize 1 maxSize 2, auto pause after 5 minutes

do you have any code currently? or just getting started from scratch?

const db = new aws.rds.Cluster("db", {
  engine: "aurora",
  engineMode: "serverless",
  engineVersion: "5.6.10a",
  dbSubnetGroupName: dbsubnet.name,
  masterUsername: "pulumi",
  masterPassword: dbpassword.result,
  scalingConfiguration: new aws.rds.ClusterScalingConfiguration(
    (autoPause = true),
    (maxCapacity = 1),
    (minCapacity = 0),
    (secondsUntilAutoPause = 60),
    (timeoutAction = ForceApplyCapacityChange)
  ),
});

```const pulumi = require("@pulumi/pulumi");
const aws = require("@pulumi/aws");
const awsx = require("@pulumi/awsx");

// Construct a VPC
const vpc = awsx.ec2.Vpc.getDefault();

// Create an Aurora Serverless MySQL database
const dbsubnet = new aws.rds.SubnetGroup("dbsubnet", {
  subnetIds: vpc.privateSubnetIds,
});

const dbpassword = "xxxxxxx";

const db = new aws.rds.Cluster("db", {
  engine: "aurora",
  engineMode: "serverless",
  engineVersion: "5.6.10a",
  dbSubnetGroupName: dbsubnet.name,
  masterUsername: "pulumi",
  masterPassword: dbpassword,
  scalingConfiguration: new ClusterScalingConfiguration({
    autoPause: true,
    maxCapacity: 1,
    minCapacity: 0,
    secondsUntilAutoPause: 60,
  }),
});```

I believe `scalingConfiguration` is an object, try this:
```const db = new aws.rds.Cluster("db", {
    engine: "aurora",
    engineMode: "serverless",
    engineVersion: "5.6.10a",
    dbSubnetGroupName: dbsubnet.name,
    masterUsername: "pulumi",
    masterPassword: dbpassword,
    scalingConfiguration: {
        autoPause: true,
        maxCapacity: 1,
        minCapacity: 0,
        secondsUntilAutoPause: 60,
    },
});```

thanks, now im getting a weird error - db subnet 'dbsubnet' does not exist

aws:rds:SubnetGroup (dbsubnet):
    error: Error creating DB Subnet Group: InvalidSubnet: Subnet IDs are required.
        status code: 400, request id: 855eca6d-b6cc-4047-b059-48818ebd9ac3v

<@U015MGCGEV9> I'm assuming you figured it out, but the issue is that the default VPC doesn't have any private subnets, so you need to use the public ones

`const dbsubnet = new aws.rds.SubnetGroup("dbsubnet", {`
  subnetIds: ["subnet-xxx", "subnet-xxxxx"],
});