Publish saved Studio pages as atomic Wiki posts and document agent editing

apps/waterfall-wiki/db/010_studio_design_posts.sql

@@ -0,0 +1,12 @@
+BEGIN;
+ALTER TABLE studio_designs ADD COLUMN IF NOT EXISTS post_id uuid REFERENCES posts(id) ON DELETE RESTRICT;
+CREATE UNIQUE INDEX IF NOT EXISTS studio_designs_post ON studio_designs(post_id) WHERE post_id IS NOT NULL;
+-- Adopt explicitly published entries, including the user's page repaired before deployment.
+UPDATE studio_designs d SET post_id=p.id
+FROM posts p
+WHERE d.post_id IS NULL AND p.slug='studio-design-'||d.id::text
+AND EXISTS(SELECT 1 FROM post_assets pa JOIN assets a ON a.id=pa.asset_id
+ WHERE pa.post_id=p.id AND a.kind='text'
+ AND strpos(a.body,'/studio/layouts/'||d.layout_id||'?id='||d.id::text)>0);
+INSERT INTO schema_migrations(version) VALUES('010_studio_design_posts') ON CONFLICT DO NOTHING;
+COMMIT;