feat: add scope parameter to insert-only merge strategy (#3827)#3842

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mattiasthalen wants to merge 16 commits intodlt-hub:develfrom

mattiasthalen:feat/3827-insert-only-scope

Commits on Apr 8, 2026

feat(schema): add TInsertOnlyStrategyDict type for insert-only scope

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feat(extract): extract insert-only scope hint from write disposition config

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feat(destinations): add previous_load scope filter to insert-only merge SQL

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test(load): add tests for insert-only scope=previous_load

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fix(destinations): use pre-filter staging + MERGE ON FALSE for insert-only scope

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feat(iceberg): add previous_load scope to iceberg insert-only merge

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feat(delta): add previous_load scope to delta insert-only merge

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fix(iceberg): use previous_load_id from loads table and append after filter

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fix(review): remove iceberg fallback and fix composite key separator

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test(load): add nested table and hard-delete tests for insert-only scope

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fix(destinations): fix nested table scope SQL and harden load_id parsing

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fix(review): use C_DLT_LOAD_ID constant and document root-table-only scope

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