Pre-implementation design for the observation/identity/campaign
three-level hierarchy. Sibling-add approach (not rename) — keep the
attackers table name, add attacker_identities as a sibling, nullable
attackers.identity_id FK. Documents the rationale, schema, bus
topics, API surface, and the 5-commit implementation sequence.
Companion to development/CAMPAIGN_CLUSTERING.md. Substrate for the
clusterer worker designed there; ships empty so the campaign
clustering fixtures can encode honest multi-row-per-actor scenarios.
anti
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