Fix ClickHouseColumn: resolve Fixed/UTC±HH:MM:SS timezone names to correct offset#2877

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polyglot/fix-fixed-utc-timezone-resolution

Commits on Jun 15, 2026

Fix ClickHouseColumn: resolve Fixed/UTC±HH:MM:SS timezone names to correct offset
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Add tests for Fixed/UTC fallback and DateTime(scale, tz) timezone resolution
polyglotAI-bot
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Clarify resolveTimeZone null contract and drop unused test import
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