# API: Backfill historical documents with documentDate on ingest

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APIAugust 14, 2026

## Backfill historical documents with documentDate on ingest[#](https://supermemory.ai/changelog/backfill-historical-documents-with-their-original-date)

Set documentDate on each document so historical content lands on the date it actually happened instead of the date you uploaded it, which is what makes time-based search work on backfilled data.

### Improvements

* A new guide walks through backfilling dated documents through the batch ingestion API, with TypeScript and Python examples.
* Company Brain admins can now change the company domain, and re-running research updates its findings in place instead of stacking duplicates.

### Fixes

* Fixed an issue where SDK responses dropped fields the API returned, across 15 endpoints.
* MCP now shows the API's real reason for refusing a request instead of reporting that your account may be restricted or blocked. A read-only key now says so.

Send up to 600 documents per request to `POST /v3/documents/batch`, sorted oldest to newest:

```
{
  "documents": [
    {
      "id": "msg-2019-04-02-118",
      "content": "Decided to move the billing cutover to Q3.",
      "documentDate": "2019-04-02T09:15:00Z"
    }
  ]
}
```

Without `documentDate` a backfilled document is dated the day you uploaded it, so a question like "what did we decide in 2019" will not find it.

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