UpdateData

Writes values into data sources, on the IO dispatcher. Updates are grouped by data source, and each updates entry (built with update) resolves to a set of key/value entries: incoming data (built with incomingUpdateData) spreads incomingData when it is a map (and contributes nothing when it isn't), inline data (built with inlineUpdateData) writes a literal map, and explicit data (built with explicitUpdateData/explicitIncomingUpdateData/explicitNullUpdateData) writes a single known key taking its value from a literal or from incomingData as-is — the only way to write a value that is itself a map/record intact. Supports the application and screen data holders (plain and segmented) and the plain and segmented local databases; updates targeting navigation data, a tile or an inline source are silently ignored. The in-memory data holders accept null (clearing the entry); the databases don't yet, so entries resolving to null are skipped instead of written. Dispatches onSuccess (no data) when every write completes without error; onFailure (no data, each failure logged), once at the end, when at least one database write failed.

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