Address tokio contention messages#6279

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lutter wants to merge 9 commits intomasterfrom

Commits on Jan 16, 2026

graph, store: Replace std::sync::RwLock with parking_lot::RwLock for pool metrics

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graph: Replace std::sync::RwLock with parking_lot::RwLock in LoadManager

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store: Replace std::sync::RwLock with parking_lot::RwLock in store_events

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store: Replace std::sync::RwLock with parking_lot::RwLock in writable

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graph: Replace std::sync::RwLock with parking_lot::RwLock in TimedCache

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store: Replace std::sync::RwLock with parking_lot::RwLock in BlockStore

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graph: Replace std::sync::RwLock with parking_lot::RwLock in MetricsRegistry

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core: Replace std::sync::RwLock with parking_lot::RwLock in SubgraphKeepAlive

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store: Add adaptive TTL cache for chain_head_ptr()

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