Add update_field, update_lag to dictionary mtz + make lifetime optional

[herbert-allium]

• Add update_field and update_lag, which is used in https://clickhouse.com/docs/sql-reference/dictionaries#refreshing-dictionary-data-using-lifetime (at the bottom section). Feel free to change the field names.
• Also makes lifetime optional, because for direct layout, lifetime cannot be passed.

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Note

Adds dictionary materialization options and tests to better align with ClickHouse dictionary refresh mechanics.

• In dictionary.sql, makes LIFETIME(...) optional and adds update_field and update_lag support within CLICKHOUSE(...) source; preserves RANGE(...) handling
• New integration tests for DIRECT layout dictionaries and for update_field/update_lag behavior; adds people_updated seed and schema entry

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[windsurf-bot]

Looks good to me 🤙

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[koletzilla]

Hi @herbert-allium, thanks for the contribution! Would you also add new tests to cover these cases? You may be able to add them following the existing ones in this file https://github.com/ClickHouse/dbt-clickhouse/blob/main/tests/integration/adapter/dictionary/test_dictionary.py

[koletzilla]

Comment to leave it as reference: this PR closes #352

[herbert-allium]

hey @koletzilla sorry for the late reply! I added some tests, can you check if they are good?

I didn't fully test the update_field and update_age behaviours because that'll require mocking the current time.

[cursor]

Falsy update_lag value silently omitted from generated SQL

Medium Severity

The condition config.get('update_lag') will evaluate to False when update_lag=0 is configured, because 0 is falsy in Jinja2. This causes the update_lag clause to be silently omitted from the generated SQL, even though 0 is a valid value meaning "no delay before reload." The existing code on line 82 uses is not none for similar checks, which is the correct pattern to handle numeric values including zero.