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Per review (house rule: no new database foreign keys / cascades; relational integrity lives in the application layer): - runtime_profile.workspace_id: drop REFERENCES workspace ON DELETE CASCADE -> plain UUID NOT NULL. - runtime_profile.created_by: drop REFERENCES "user" ON DELETE SET NULL -> plain UUID. - agent_runtime.profile_id: drop REFERENCES runtime_profile ON DELETE CASCADE -> plain UUID. CHECK constraints, UNIQUE (workspace_id, display_name), the workspace index, and the partial unique index agent_runtime_workspace_daemon_profile_key are unchanged. The legacy UNIQUE (workspace_id, daemon_id, provider) constraint remains untouched. Behavioral consequence: the database no longer auto-removes a profile's agent_runtime instance rows on profile delete. That cleanup moves into PR2's profile-delete path. Up-migration comments document this; down-migration comment no longer references FKs/cascade. Re-verified on Postgres 17: migrate up applies 120; no FK constraints exist on the new columns; partial index still blocks dup (ws,daemon,profile_id); CHECK and display_name uniqueness still reject bad input; deleting a profile now leaves the runtime row orphaned (proving cascade is gone); down/up round-trip clean with the legacy constraint intact. Co-authored-by: multica-agent <github@multica.ai>