> For the complete documentation index, see [llms.txt](https://docs.lingoql.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.lingoql.com/sub0/apis-abi/practical-examples/wallet-backend-data-model.md).

# Wallet backend: Data model

Start here when you want the data layer first.

### Best for

A wallet or account backend with uploads and OAuth.

### What it shows

* One model per file
* Core relationships for the walkthrough
* Timestamp fields needed for common SQL write patterns

### Use this when

You want safe model snippets that can be pasted one file at a time.

{% hint style="info" %}
Create one file per model, such as `_users.json` or `_transactions.json`.
{% endhint %}

#### `_users`

```json
{
  "id": {
    "type": "String",
    "primary_key": true
  },
  "name": {
    "type": "String",
    "fts": true,
    "indexable": true
  },
  "email": {
    "type": "String",
    "max_length": 255,
    "fts": true,
    "indexable": true
  },
  "wallet_balance": {
    "type": "Float"
  },
  "password": {
    "type": "String",
    "max_length": 255
  },
  "age": {
    "type": "Number",
    "optional": true
  },
  "created_at": {
    "type": "DateTime"
  },
  "updated_at": {
    "type": "DateTime"
  },
  "deleted_at": {
    "type": "DateTime",
    "optional": true
  }
}
```

#### `_transactions`

```json
{
  "id": {
    "type": "String",
    "primary_key": true
  },
  "user_id": {
    "type": "String",
    "foreign_key": {
      "of": "_users",
      "key": "id"
    }
  },
  "amount": {
    "type": "Float"
  },
  "status": {
    "type": "String"
  },
  "created_at": {
    "type": "DateTime"
  },
  "updated_at": {
    "type": "DateTime"
  },
  "deleted_at": {
    "type": "DateTime",
    "optional": true
  }
}
```

#### `_gallery`

```json
{
  "id": {
    "type": "String",
    "primary_key": true
  },
  "user_id": {
    "type": "String",
    "foreign_key": {
      "of": "_users",
      "key": "id"
    }
  },
  "storage_key": {
    "type": "String"
  },
  "url": {
    "type": "String"
  },
  "dominant_color": {
    "type": "String"
  },
  "file_size": {
    "type": "String"
  },
  "created_at": {
    "type": "DateTime"
  },
  "updated_at": {
    "type": "DateTime"
  },
  "deleted_at": {
    "type": "DateTime",
    "optional": true
  }
}
```

#### `_csrf_token_store`

```json
{
  "id": {
    "type": "String",
    "primary_key": true
  },
  "user_id": {
    "type": "String",
    "foreign_key": {
      "of": "_users",
      "key": "id"
    }
  },
  "csrf_token": {
    "type": "String"
  },
  "created_at": {
    "type": "DateTime"
  },
  "updated_at": {
    "type": "DateTime"
  },
  "deleted_at": {
    "type": "DateTime",
    "optional": true
  }
}
```

### Next step

Continue with auth and account endpoints in the next walkthrough page.


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