classify_field_shape() received a deduplicated set of observed values with
no real event-volume context, so cardinality was always measured against
itself — trivially 100%, making any field with more than ~16 distinct
values look "high cardinality" no matter how large the real traffic volume
was. This misclassified genuinely low-cardinality fields (e.g. username: 82
distinct values across 1,601 events) as free text, which the new shape-veto
work then surfaced as false-positive "remove this field" warnings in
production. Fixed by passing real event coverage as an explicit
total_events parameter; omitting it keeps prior behavior for other callers.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Completes the last deferred item from ROADMAP §0: entities recognized as
the same real-world concept across enabled streams (e.g. srcip in both a
firewall and an IIS stream) now share baseline knowledge of entity
presence/age and known relationship-target values, instead of each stream
learning it cold. Implemented additively (synthetic shared_entity:<group>
namespace in the existing baseline.py tables, no schema migration), scoped
to entity presence + relationship known-values only — per-stream
distribution baselines stay untouched. Also fixes a latent alias-map
collision bug found while building this (ALIAS_CANONICAL_BY_FIELD let
"context" silently steal "hostname"/"dns_query" from their own canonical
groups).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
