docs: add Phase 1 implementation plan for ClickHouse migration

10-task TDD plan covering: CH dependency, config, schema init,
ClickHouseMetricsStore, MetricsQueryStore interface extraction,
ClickHouseMetricsQueryStore, feature flag wiring, k8s deployment,
integration tests.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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hsiegeln
2026-03-31 16:43:14 +02:00
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commit c77d8a7af0

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