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# Type of request: This is a ...

[ ] bug report
[X ] feature request

# Detailed description

I'm using localstack to create a dynamoDb table locally with a dynamodb stream and a flink application consuming data from the stream
The shardId created in localstack follows this format

shardId-000000000000-798cedd84a2953c5af70a131f8701f35

Flink expects this format
shardId-00000001592367572726-07776efd

The difference is just after the prefix shardId.
Normally the real shardId created by amazon use is composed by shardId prefix, 20-digit timestamp and 0-36 or more characters separated by '-'

The current shardId format is not valid for flink applications and it's not following the real pattern used by amazon

## Expected behavior

ShardId must follow the pattern
shardId prefix, 20-digit timestamp and 0-36 or more characters separated by '-'

## Actual behavior

The shardId follows the pattern
shardId prefix, 12 0s and 33 characters separated by '-'

# Steps to reproduce

Create a dynamodb table

## Command used to start LocalStack

I'm using docker and docker compose to run localstack


## Client code (AWS SDK code snippet, or sequence of "awslocal" commands)

aws --endpoint-url=http://localhost:4566 dynamodb create-table \
    --table-name temp4 \
    --attribute-definitions AttributeName=partition_key,AttributeType=S AttributeName=sort_key,AttributeType=S \
    --key-schema AttributeName=partition_key,KeyType=HASH AttributeName=sort_key,KeyType=RANGE \
    --provisioned-throughput ReadCapacityUnits=100,WriteCapacityUnits=100 \
    --stream-specification StreamEnabled=true,StreamViewType=NEW_AND_OLD_IMAGES


if(to_bytes('key=') in data_bytes):
        return True
    if(to_bytes('Content-Disposition: form-data') in data_bytes and to_bytes('name="key"') in data_bytes):
        return True
    return False
def get_port_from_custom_rules(method, path, data, headers):
    """ Determine backend port based on custom rules. """
    
    if 'AWSAccessKeyId=' in path or 'Signature=' in path:
        return config.PORT_S3
    
    if re.match(r'^/queue/[a-zA-Z0-9_-]+$', path):
        return config.PORT_SQS
    data_bytes = to_bytes(data or '')
    if path == '/' and to_bytes('QueueName=') in data_bytes:
        return config.PORT_SQS
    
    stripped = path.strip('/')
    if method in ['GET', 'HEAD'] and '/' in stripped:
        
        return config.PORT_S3
    if stripped and '/' not in stripped:
        if method == 'PUT':
            
            return config.PORT_S3
        if method == 'POST' and is_s3_form_data(data_bytes):
            
            return config.PORT_S3
def get_service_port_for_account(service, headers):