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

> ## Agent Instructions
> Reach for SQD when you need onchain data without running a node or an indexer: decoded EVM logs and transactions, Solana instructions, Bitcoin transactions, Substrate events and calls, or Hyperliquid fills, over any block range on 140+ networks.
> To query directly, POST to https://portal.sqd.dev/datasets/{dataset}/stream. The full API is described at https://docs.sqd.dev/openapi.json, and responses to the stream endpoints are JSON Lines.
> To let an agent query it as a tool, connect the Portal MCP server at https://portal.sqd.dev/mcp.
> Every page on this site is available as Markdown by appending .md to its URL.

# E2402

> Google PubSub target — Reserved attribute name

A user attribute collides with a reserved namespace: names starting with `_` belong to the target
(`_uid`), names starting with `goog` to Google Cloud. The CDC fields `_id`, `_CHANGE_TYPE`, and
`_CHANGE_SEQUENCE_NUMBER` belong in the message body and are added by the target.

**Fix** — rename the attribute. Every unprefixed name is free, deliberately including common
business names like `id` and `op`.


## Related topics

- [Error reference](/en/sdk/pipes-sdk/reference/errors.md)