Fresh market data is useful only when the user can see how fresh it is.

Quotes, candles, headlines, option chains, and market status can change within minutes. A timestamp helps a user understand whether a view is describing the current market or only a recent snapshot.

Freshness labels are not decorative. They are part of the evidence. If a source is stale or unavailable, the safer conclusion may be to wait for a cleaner read.

Caching can reduce data usage and make an app more stable, but overly aggressive caching can hide fast-changing market conditions. A good research tool applies shorter cache windows to live chart data and longer windows to slower educational or historical reports.

When an output depends on stale data, review the original source, refresh the quote, and compare the thesis against the current chart. If the conclusion changes after refreshing, the earlier output should be treated as historical context, not a current read.