chore: import upstream snapshot with attribution

cli-tool/components/skills/database/cloud-sql-basics/references/cli-usage.md

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+# Cloud SQL CLI Usage
+
+The `gcloud sql` command group is used to manage Cloud SQL instances and
+related resources.
+
+## Basic Syntax
+
+```bash
+gcloud sql [GROUP] [COMMAND] [FLAGS]
+```
+
+## Essential Commands
+
+### Instance Management
+
+- **Create an instance:**
+
+  ```bash
+  gcloud sql instances create my-instance --database-version=MYSQL_8_0 \
+      --tier=db-f1-micro --region=us-central1 \
+      --quiet
+  ```
+
+- **List instances:**
+
+  ```bash
+  gcloud sql instances list --quiet
+  ```
+
+- **Describe an instance:**
+
+  ```bash
+  gcloud sql instances describe my-instance --quiet
+  ```
+
+- **Restart an instance:**
+
+  ```bash
+  gcloud sql instances restart my-instance --quiet
+  ```
+
+### Database and User Management
+
+- **Create a database:**
+
+  ```bash
+  gcloud sql databases create my-db --instance=my-instance --quiet
+  ```
+
+- **Create a user:**
+
+  ```bash
+  gcloud sql users create my-user --instance=my-instance \
+      --password=my-password \
+      --quiet
+  ```
+
+### Operations and Backups
+
+- **List operations:**
+
+  ```bash
+  gcloud sql operations list --instance=my-instance --quiet
+  ```
+
+- **Create a backup:**
+
+  ```bash
+  gcloud sql backups create --instance=my-instance --quiet
+  ```
+
+- **Restore from a backup:**
+
+  ```bash
+  gcloud sql backups restore backup_id --restore-instance=my-instance --quiet
+  ```
+
+## Common Flags
+
+- `--project`: Specifies the project ID.
+
+- `--region`: The region where the instance is located.
+
+- `--format`: Changes output format (e.g., `json`, `yaml`).