Based on the research, I can help you resolve this error. The issue is that while you have PostgreSQL running, the actual database named "prefect" hasn't been created yet. Here's how to fix it: 1. Create the Database First Before starting the Prefect server, you need to create the database. You have several options: a. Using psql CLI:

sql
   psql -U your_postgres_user -h your_host
   CREATE DATABASE prefect;

b. Using a PostgreSQL client or management tool:

sql
   CREATE DATABASE prefect;

2. Enable Required Extension After creating the database, connect to it and enable the required extension:

sql
   \c prefect
   CREATE EXTENSION IF NOT EXISTS pg_trgm;

3. Environment Configuration Ensure your ECS task definition includes the correct environment variable:

PREFECT_API_DATABASE_CONNECTION_URL=<postgresql+asyncpg://username:password@your-postgres-host:5432/prefect>

4. Deployment Order Make sure to: 1. Create the PostgreSQL database first 2. Enable the pg_trgm extension 3. Then start your Prefect server ECS task If you're using AWS RDS for PostgreSQL, you can also create the database through the AWS CLI or AWS Console using RDS commands. Common Gotchas to Check: - Ensure the PostgreSQL user has permissions to create databases - Verify the database name is exactly "prefect" (case sensitive) - Check that your ECS task has network access to the PostgreSQL instance - Verify the connection URL format in your environment variables Would you like me to provide more specific details about any of these steps? Also, it would be helpful to know: 1. Are you using Amazon RDS or a self-managed PostgreSQL instance? 2. How are you currently trying to create the database?