DL-271

Handle→id resolution is owner-namespaced, stored in a dedicated account_handles(account_id, handle, owner_user_id NULL) table with two partial-unique indexes (user/system handles globally unique; agent handles unique per owner). Agents are addressed owner-qualified (matt/compass-ux, bare = caller’s own owner); users/system bare. Rename is in-place for both tiers; reclaim is allowed for both tiers (no history, tombstone, or reservation) — cross-human reclaim safety is the owner-peering authorization edge (RIG-2796), not handle reservation. The handle column stays on accounts for display only; account_handles is the resolution key.

Status: Active (Matt, 2026-08-27)

Record: ../../server/compass-handle-addressing-cutover/design.md#ledger-impact