Cloud SQL creation with Deployment Manager - "Precondition check failed." error - google-cloud-platform

Question

I'm using the gcp-types/sqladmin-v1beta4:instances Resource Type to create a Cloud SQL instance using the Deployment Manager and I'm getting the error below:
{
"ResourceType":"gcp-types/sqladmin-v1beta4:instances",
"ResourceErrorCode":"400",
"ResourceErrorMessage":{
"code":400,
"message":"Precondition check failed.",
"status":"FAILED_PRECONDITION",
"statusMessage":"Bad Request",
"requestPath":"https://www.googleapis.com/sql/v1beta4/projects/[PROJECT_NAME]/instances",
"httpMethod":"POST"
}
}
Here's the configuration inside the JINJA file:
{% set deployment_name = env['deployment'] %}
{% set INSTANCE_NAME = deployment_name + '-instance' %}
resources:
- name: {{ INSTANCE_NAME }}
type: gcp-types/sqladmin-v1beta4:instances
properties:
region: us-central1
rootPassword: root
settings:
tier: db-n1-standard-1
backupConfiguration:
binaryLogEnabled: true
enabled: true
- name: demand_ml_db
type: gcp-types/sqladmin-v1beta4:databases
properties:
name: demand_ml_db
instance: $(ref.{{ INSTANCE_NAME }}.name)
charset: utf8

Answer 1

The FAILED_PRECONDITION error - while not very descriptive, tends to be thrown when you're attempting to deploy over a previous Cloud SQL instance that was recently deleted; as a matter of fact, the instance you selected for deletion is not cleaned up instantly. There's an Issue Tracker thread regarding this here.
I was able to verify this on my end as well. The deployment using the JINJA file you've specified worked fine at first, but when I deleted it, and re-deployed - I received the same error.
The most simple approach is to try using a different deployment (or instance) name.