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auth_events.user_id was overloaded and meant something different per call site: admin mutations filed the row under the target user and hid the acting admin in metadata->>'by', team events filed it under the actor, and quota events switched between the two depending on scope. The practical consequence was that "show me everything admin X did" had no answer. Adds actor_id (never NULL) and target_id (NULL when the event is not about a user) alongside the existing column, which keeps its meaning as the per-user feed key so nothing historical is rewritten. The backfill recovers the actor from metadata for rows that predate the columns. Also adds the indexes the cross-user admin feed needs. The only index was (user_id, created_at DESC), so the global feed -- which orders by created_at with no user predicate -- fell back to a sequential scan plus a sort on every page. The feed gains actor, multi-event, until and free-text search filters, plus a distinct-event catalogue so the UI can offer what the instance recorded instead of asking operators to type a name from memory.