Paramodel

Run-time domain model for event-sourcing.

TODO: Split store impl into functions
TODO: Use LRU cache for PII keys. Delete from cache when committing a shredded scope.
TODO: Validate model: Dependencies must exist AND not cause loop. Dependency of a materialized view cannot be disclosing. Events for mutators must exist. Mapping keys must be equal.
TODO: Memory driver continuation tokens must be improved (can't just skip over stuff)
TODO: Add store.views() for iterating over all views
TODO: Add provider.stores() for iterating over all stores (this requires store to be registered somehow)
TODO: Add store.drop() for dropping views that are no longer modelled.
TODO: Support fast sweeping sync (not storing every commit, like a purge on the fly sort of)
TODO: Add auto-mapping projection (disclosing all PII)
TODO: External continuation tokens (when there's a server) must include version and timestamp and shall expire when too old (older than purge ttl) - or be renewed in case version is still not purged!

paramodel