improved a lot of things

packages/origin-graph/migrations/002_artboard_ancestry.sql

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+-- Origin Graph — Artboard Ancestry Materialized View
+-- Migration: 002
+-- Pre-computes all ancestor/descendant relationships so the app never needs
+-- recursive CTEs at query time. Updated automatically on artboards INSERT.
+
+CREATE MATERIALIZED VIEW artboard_ancestry AS
+WITH RECURSIVE ancestry(artboard_id, ancestor_id, depth) AS (
+  -- Base: each artboard is at depth 0 relative to itself
+  SELECT id AS artboard_id, id AS ancestor_id, 0 AS depth
+  FROM artboards
+
+  UNION ALL
+
+  -- Recurse: walk up the parent chain
+  SELECT a.id AS artboard_id, anc.ancestor_id, anc.depth + 1
+  FROM artboards a
+  JOIN ancestry anc ON a.parent_artboard_id = anc.artboard_id
+)
+SELECT artboard_id, ancestor_id, depth
+FROM ancestry
+WHERE artboard_id <> ancestor_id  -- exclude self-reference
+ORDER BY artboard_id, depth;
+
+CREATE UNIQUE INDEX artboard_ancestry_pk
+  ON artboard_ancestry(artboard_id, ancestor_id);
+
+CREATE INDEX artboard_ancestry_ancestor_idx
+  ON artboard_ancestry(ancestor_id);
+
+-- ── Refresh trigger ───────────────────────────────────────────────────────────
+-- Refreshes the materialized view concurrently whenever an artboard is
+-- inserted. CONCURRENTLY requires the unique index above — it allows reads
+-- to continue during refresh.
+
+CREATE OR REPLACE FUNCTION refresh_artboard_ancestry()
+RETURNS TRIGGER LANGUAGE plpgsql AS $$
+BEGIN
+  REFRESH MATERIALIZED VIEW CONCURRENTLY artboard_ancestry;
+  RETURN NULL;
+END;
+$$;
+
+CREATE TRIGGER trg_artboard_ancestry_refresh
+  AFTER INSERT OR UPDATE OF parent_artboard_id ON artboards
+  FOR EACH STATEMENT
+  EXECUTE FUNCTION refresh_artboard_ancestry();