Change segment names to add stable config IDs for multi topic ingestion#18830

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rseetham:stable-topic-ids-pr

Commits on Jun 22, 2026

Add stream.config.id support to config model for stable multi-topic IDs
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Auto-assign stream.config.id on table config validation
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Add MultiTopicLLCSegmentName with 5-part segment name format
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Create new segments with 5-part multi-topic format
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Add integration tests for stable topic ID assignment and segment naming
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Add getStreamConfigId() to LLCSegmentName
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Migrate all decode sites to use stable stream config ID
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Use segment name directly for stream config lookup instead of table config scan
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Read config ID from segment name in IngestionDelayTracker, not from arithmetic
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Fix test failures from ensureStreamConfigIds mutation of shared map references
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