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Storage

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historicalSessions

Mapping from historical session indices to session-data root hash and validator count. Namespace 
api.query.historical.historicalSessions
Type 
function historicalSessions(
  u32
): Option<(H256,u32)>

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storedRange

The range of historical sessions we store. [first, last) Namespace 
api.query.historical.storedRange
Type 
function storedRange(

): Option<(u32,u32)>