How to fix Error: Error creating Cloud SQL Instance: OperationError in Terraform

resource "google_sql_database_instance" "example" {
  name             = "my-new-instance-name-${formatdate("YYYYMMDDhhmmss", timestamp())}"
  database_version = "POSTGRES_15"
  region           = "us-central1"
}

gcloud services enable sqladmin.googleapis.com
gcloud services enable compute.googleapis.com
gcloud services enable cloudresourcemanager.googleapis.com
gcloud services enable servicenetworking.googleapis.com

gcloud projects add-iam-policy-binding PROJECT_ID \
  --member="serviceAccount:SERVICE_ACCOUNT_EMAIL" \
  --role="roles/cloudsql.admin"

gcloud projects add-iam-policy-binding PROJECT_ID \
  --member="serviceAccount:SERVICE_ACCOUNT_EMAIL" \
  --role="roles/compute.networkAdmin"

resource "google_sql_database_instance" "instance1" {
  name = "instance-1"
  # ... configuration
}

resource "google_sql_database_instance" "instance2" {
  name = "instance-2"
  # ... configuration
  depends_on = [google_sql_database_instance.instance1]
}

resource "google_sql_database" "example" {
  name     = "example_db"
  instance = google_sql_database_instance.instance1.name
  depends_on = [google_sql_database_instance.instance1]
}

terraform apply -parallelism=1

resource "google_sql_database_instance" "example" {
  name             = "my-instance"
  database_version = "POSTGRES_15"
  region           = "us-central1"
  settings {
    tier = "db-f1-micro"
  }

  timeouts {
    create = "20m"
    delete = "20m"
    update = "20m"
  }
}

export TF_LOG=DEBUG
terraform apply 2>&1 | tee terraform.log

# Check logs for specific error details
grep -i "operation\|error\|409\|conflict" terraform.log