## Problem
The Snowflake guide leaves several setup details open to interpretation,
particularly how roles are used and which RSA key content belongs in
Snowflake versus the Dashboard.
This PR is stacked on #50751 so the documented role location,
private-key upload, and **Start pipeline** action match the updated
creation sheet. The full stack starts with #50708, which moves the guide
to its nested Pipelines path.
## Solution
Clarifies the setup sequence, explains the default and optional role
behaviour, distinguishes `rsa_key.pub` from `rsa_key.p8`, and makes the
destination field guidance more direct.
## To test
- [Snowflake
guide](https://docs-git-dnywh-docsimprove-snowflake-setup-supabase.vercel.app/docs/guides/database/replication/pipelines/snowflake)
## Review instructions
1. Read the setup path from **Prepare Snowflake resources** through
**Configure Snowflake as a destination**.
2. Confirm the role guidance explains what happens when the Dashboard
field is empty.
3. Confirm it is clear which key file is registered in Snowflake and
which file is pasted or uploaded in the Dashboard.
## Checklist
- [x] I have read
[CONTRIBUTING.md](https://github.com/supabase/supabase/blob/master/CONTRIBUTING.md)
- [x] If I wrote a new docs topic or edited an existing topic, I used
the `/write-the-docs` or `/edit-the-docs` skill, which references
[WORD_LIST](https://github.com/supabase/supabase/blob/master/apps/docs/WORD_LIST.md)
and the docs
[CONTRIBUTING](https://github.com/supabase/supabase/blob/master/apps/docs/CONTRIBUTING.md)
guide
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Documentation**
* Updated the Snowflake guide with clearer setup steps and requirements
for roles, ownership, key handling, account IDs, and Dashboard settings.
* Expanded guidance on append-only history, current-state queries,
dynamic-table freshness and costs, stream and task recovery, type
serialization, and the effects of schema changes on historical data.
* Renamed the pipeline setup button to **Start pipeline**.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Danny White