Read persisted signal data for this context.
Promise resolving to signal or null if none persisted
Initialize storage for this signal context.
Whether this is the first initialization
Promise that resolves when initialization is complete
Write signal data for this context (null to clear).
Signal data to persist, or null to clear
Promise that resolves when write is complete
Per-context signal persistence instance interface. Scoped to a specific (symbol, strategyName, exchangeName) triple.
Custom adapters should implement this interface to override the default file-based signal persistence behavior.