> ## Documentation Index
> Fetch the complete documentation index at: https://docs.alumio.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Storage: Load progress

> Makes the data saved in a storage by the "Storage: Track progress" transformer available in the entity data.

export const FormField = ({property, label, required = false, diType, uiPatterns, children}) => {
  const patterns = Array.isArray(uiPatterns) ? uiPatterns : uiPatterns ? [uiPatterns] : [];
  return <div style={{
    margin: '1.5rem 0'
  }}>
      <div style={{
    display: 'flex',
    alignItems: 'baseline',
    flexWrap: 'wrap',
    gap: '0.5rem',
    marginBottom: '0.25rem'
  }}>
        <strong>{label}</strong>
        <span style={{
    fontSize: '0.7rem',
    fontWeight: 600,
    textTransform: 'uppercase',
    letterSpacing: '0.04em',
    color: required ? '#6241f5' : '#6b7280'
  }}>
          {required ? 'Required' : 'Optional'}
        </span>
      </div>

      <div>{children}</div>

      {diType || patterns.length > 0 ? <p style={{
    fontSize: '0.85rem',
    color: '#6b7280',
    marginBottom: 0
  }}>
          {diType ? <>
              See the <a href={`/references/${diType}`}>{diType}</a> reference.{' '}
            </> : null}
          {patterns.length > 0 ? <>
              Accepts a <a href={`/documentation/placeholders-and-patterns/patterns#${patterns[0]}`}>pattern</a>.
            </> : null}
        </p> : null}
    </div>;
};

Reads the progress that the [Storage: Track progress](/references/transformer/storage-tracker-save-in-storage) transformer saved earlier and places it into the data flowing through your transformation. You get back two things: the date the previous run reached, and the list of identifiers it already processed. Use it at the start of a run to resume from where you left off, for example to ask a source system only for records changed since the last successful run, so you never reprocess everything. When no progress has been saved yet, a start date you choose is used instead.

This documentation describes: [Schema](/schemas/transformer/storage-tracker-load-from-storage)

## Fields

<FormField property="tracker" label="Storage" required diType="storage">
  The storage that holds the tracked progress. Use the same storage you pointed the [Storage: Track progress](/references/transformer/storage-tracker-save-in-storage) transformer at. See [Storage](/references/storage) for how to set one up.
</FormField>

<FormField property="datePath" label="Path to date">
  Where in your data to place the date the previous run reached. Defaults to `tracker_state_date`. Supports [placeholders](/references/placeholders).
</FormField>

<FormField property="dateFormat" label="Date format">
  The format the date is written in. Defaults to `Y-m-d\TH:i:sP`, which produces a value like `2026-06-10T14:30:00+00:00`. See [the PHP date formats reference](https://www.php.net/manual/datetime.formats.php) for the available format codes.
</FormField>

<FormField property="identifiersPath" label="Path to entity identifiers">
  Where in your data to place the list of identifiers that were already processed. Defaults to `tracker_state_identities`. Supports [placeholders](/references/placeholders).
</FormField>

<FormField property="startDate" label="Start date">
  The date to use when no progress has been saved yet, so the first run still has a sensible starting point. Defaults to `1970-01-01`, which effectively means "from the beginning".
</FormField>

## Sample data

This transformer reads progress from a configured storage, so what it adds to your data depends on what an earlier [Storage: Track progress](/references/transformer/storage-tracker-save-in-storage) run recorded. The example below shows a typical configuration that uses the default paths and format. With it, the previously reached date is written to `tracker_state_date` and the already-processed identifiers to `tracker_state_identities`. When no progress has been saved yet, the start date (by default `1970-01-01`) is written instead and the identifiers list is empty.

| Field                      | Value                                |
| -------------------------- | ------------------------------------ |
| Storage                    | A configured storage                 |
| Path to date               | `tracker_state_date` (default)       |
| Date format                | `Y-m-d\TH:i:sP` (default)            |
| Path to entity identifiers | `tracker_state_identities` (default) |
| Start date                 | `1970-01-01` (default)               |

```json Configuration theme={null}
{
  "prototype": "storage-tracker-load-from-storage",
  "parameters": {
    "tracker": { "prototype": "storage", "parameters": {} }
  }
}
```