feat: ClickHouse bring-your-own-warehouse connections#8020

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feat/clickhouse-byo-warehouse-backend

Commits on Jul 15, 2026

feat: add EncryptedJSONField backed by a rotatable Fernet key ring
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feat: add encrypted credentials column to warehouse connections
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feat: accept ClickHouse warehouse connection config and credentials
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feat: verify ClickHouse warehouse connections against the customer instance
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feat: wire ClickHouse verification into warehouse connection endpoints
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refactor: extract warehouse validation into a dedicated module
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test: neutral ClickHouse fixture data and bare Given/When/Then markers
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refactor: encrypt warehouse credentials with a SECRET_KEY-derived Fernet key
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Commits on Jul 16, 2026