In-memory cache of pushed data, keyed by symbol.

Mirrors the local data store maintained by the upstream longbridge/openapi Rust and Go SDKs (SecuritiesData / Store in their respective cores). Updated on every push event the QuoteContext receives, queried by the realtime_* family of methods.

Backed by an ETS table owned by the QuoteContext process so it inherits the connection's lifecycle.

Data retained per symbol

• quote — most recent PushQuote (one)
• depth — most recent PushDepth (one)
• brokers — most recent PushBrokers (one)
• trades — recent PushTrade entries (capped at 500)