feat(admin): stabilize blog and admin patterns

db/migrations/V027__BlogSoftDeleteAndSlugIndex.sql

@@ -0,0 +1,21 @@
+ALTER TABLE blog_posts
+    ADD COLUMN IF NOT EXISTS deleted_at TIMESTAMPTZ;
+
+DROP INDEX IF EXISTS idx_blog_slug;
+DROP INDEX IF EXISTS blog_posts_slug_key;
+
+CREATE UNIQUE INDEX IF NOT EXISTS ux_blog_posts_slug_active
+    ON blog_posts (slug)
+    WHERE deleted_at IS NULL;
+
+CREATE INDEX IF NOT EXISTS idx_blog_slug_active
+    ON blog_posts (slug)
+    WHERE deleted_at IS NULL;
+
+CREATE INDEX IF NOT EXISTS idx_blog_published_active
+    ON blog_posts (is_published, published_at DESC)
+    WHERE deleted_at IS NULL;
+
+CREATE INDEX IF NOT EXISTS idx_blog_category_active
+    ON blog_posts (category_id)
+    WHERE deleted_at IS NULL;