fix: guard run_hooks commit with @@trancount check for autocommit safety#709
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dbt-core's run_hooks macro emits a bare 'commit;' before running inside_transaction=False hooks (after_commit). With autocommit=True there is no open SQL Server transaction, causing error 3902. Override run_hooks for the sqlserver adapter, replacing the bare commit with 'if @@trancount > 0 commit;' which only commits when a transaction is actually open. Add TestAfterCommitModelHook regression test that creates a table model with an after_commit post-hook and verifies it runs without error.
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dbt-core's run_hooks macro emits a bare 'commit;' before running inside_transaction=False hooks (after_commit). With autocommit=True there is no open SQL Server transaction, causing error 3902. Closes #444
Override run_hooks for the sqlserver adapter, replacing the bare commit with 'if @@trancount > 0 commit;' which only commits when a transaction is actually open.
Add TestAfterCommitModelHook regression test that creates a table model with an after_commit post-hook and verifies it runs without error.
Follow up: #708