docs: port "achieving atomic inserts" knowledgebase page

[mintlify]

Summary

Port the new knowledgebase/achieving-atomic-inserts.mdx page from ClickHouse/clickhouse-docs#6325 (and its precursor PR #6306) into the Mintlify site, including the latest wording adjustment.

Changes

• Created resources/support-center/knowledge-base/data-import-export/achieving-atomic-inserts.mdx with Mintlify-compatible transforms:
  • <VerticalStepper headerLevel="h3"> → <Steps> / <Step> blocks
  • \{#anchor\} (escaped Docusaurus anchors) → {#anchor}
  • Adjusted internal links from /sql-reference/statements/alter/partition* to /core/reference/statements/alter/partition* to satisfy the broken-link checker (the target page has a slug: alias to the legacy path, but cross-links elsewhere in the repo use the /core/reference/... form).
• Wired the new page into resources/support-center/navigation.json under data-import-export.
• Applied the upstream wording change: "You can try it at [fiddle]" → "You can run the example below interactively using [fiddle]".

Context

The source page is brand-new upstream (added in ClickHouse/clickhouse-docs#6306, edited in #6325) and had no entry in _migration/slug-map.csv.

Ambiguity to flag

• Category placement: I placed the page under data-import-export based on its Data Ingestion tag. Other plausible categories include data-management or performance-optimization — please reassign if a different bucket is preferred.
• Slug-map entry: Since this is a new page, no slug-map row exists yet. The Docusaurus URL /knowledgebase/achieving-atomic-inserts will need a mapping/alias added in a follow-up if URL parity matters.

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Note

Low Risk
Documentation-only addition with navigation wiring; no application or data-path changes.

Overview
Adds a new Support Center knowledge base article on atomic bulk loads and multi-table consistency in ClickHouse Cloud when multi-statement transactions are not available.

The page documents a staging-table + partition swap workflow (MOVE PARTITION, ATTACH PARTITION, REPLACE PARTITION), including Mintlify <Steps> formatting, links to /core/reference/statements/alter/partition, constraints, a fiddle example, and the updated fiddle intro wording from upstream.

Registers the page at the top of the Data Import & Export section in navigation.json.

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Project	Status	Preview	Updated (UTC)
ClickHouse-docs	🟢 Ready	View Preview	Jun 2, 2026, 9:00 AM