-- AP1.4b: Plan-Ist-Verknüpfung für Evidence und Reviews

ALTER TABLE evidence
    ADD COLUMN roadmap_item_id UUID NULL REFERENCES roadmap_items(id) ON DELETE SET NULL;

ALTER TABLE reviews
    ADD COLUMN roadmap_item_id UUID NULL REFERENCES roadmap_items(id) ON DELETE SET NULL;

CREATE INDEX idx_evidence_roadmap_item ON evidence(tenant_id, roadmap_item_id)
    WHERE roadmap_item_id IS NOT NULL;
CREATE INDEX idx_reviews_roadmap_item ON reviews(tenant_id, roadmap_item_id)
    WHERE roadmap_item_id IS NOT NULL;

-- Bestehende milestone_id-Verknüpfungen spiegeln (RoadmapItem behält oft dieselbe UUID)
UPDATE evidence e
SET roadmap_item_id = e.milestone_id
WHERE e.milestone_id IS NOT NULL
  AND EXISTS (
      SELECT 1 FROM roadmap_items ri
      WHERE ri.id = e.milestone_id AND ri.tenant_id = e.tenant_id
  );

UPDATE reviews r
SET roadmap_item_id = r.milestone_id
WHERE r.milestone_id IS NOT NULL
  AND EXISTS (
      SELECT 1 FROM roadmap_items ri
      WHERE ri.id = r.milestone_id AND ri.tenant_id = r.tenant_id
  );