[DON'T MERGE] Code change to upstream#1

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qsliu2017 wants to merge 17 commits intomainfrom

Commits on Feb 12, 2026

export GetDuckDBDatabase() C accessor for external extensions

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Commits on Feb 13, 2026

Commits on Feb 14, 2026

export DuckdbUnsafeSetNextExpectedCommandId
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Commits on Feb 24, 2026

Export pgduckdb_get_querydef and pgduckdb_relation_name symbols

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Allow pg_ducklake extension functions in DuckDB-only function cache

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Commits on Feb 25, 2026

Commits on Mar 2, 2026

feat: add DuckdbAllowSubtransaction hook
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Commits on Mar 3, 2026

Commits on Mar 4, 2026

feat: export hooks and type functions for ducklake_fdw

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Commits on Mar 5, 2026