-- ADR-0017 refinement: Hub sessions are provider/role/model-bound.
-- Existing sessions predate role-aware binding; treat them as draft sessions.
ALTER TABLE "AgentSession" ADD COLUMN "roleId" TEXT NOT NULL DEFAULT 'draft';
ALTER TABLE "AgentSession" ALTER COLUMN "roleId" DROP DEFAULT;

CREATE INDEX "AgentSession_provider_roleId_model_idx" ON "AgentSession"("provider", "roleId", "model");
CREATE INDEX "AgentSession_projectId_provider_roleId_model_archivedAt_idx" ON "AgentSession"("projectId", "provider", "roleId", "model", "archivedAt");

DROP INDEX "AgentSession_provider_model_idx";