diff --git a/.github/workflows/client.yml b/.github/workflows/client.yml
index ed0a9dc7d..aa2b7909d 100644
--- a/.github/workflows/client.yml
+++ b/.github/workflows/client.yml
@@ -69,11 +69,11 @@ jobs:
           VITE_RECAPTCHA_KEY: "6LcsYbIpAAAAAEJffjIXmbQcxj_SBZG7BnSPjF4L"
           VITE_SERVER_URL: "https://v3-boku.tachi.ac"
           VITE_DISCORD: "https://discord.gg/E4n8ZZF5ES"
-          VITE_CDN_URL: "https://cdn-v3-boku.tachi.ac"
+          VITE_CDN_URL: "https://cdn-boku.tachi.ac"
           TACHI_NAME: "Bokutachi"
           BUILD_OUT_DIR: /tmp/boku
 
-      - name: Build Kamaitachi (v3)
+      - name: Build Kamaitachi
         run: bun run --filter tachi-client build
         env:
           VITE_MANDATE_LOGIN: true
@@ -83,7 +83,7 @@ jobs:
           VITE_MIN_CLIENT_ID: "A0DBDBB063CD800530EF01C6488B282137E0191E"
           VITE_DISCORD: "https://discord.gg/NNgGJbpQUj"
           VITE_TCHIC_MODE: "kamai"
-          VITE_CDN_URL: "https://cdn-v3-kamai.tachi.ac"
+          VITE_CDN_URL: "https://cdn-kamai.tachi.ac"
           VITE_GIT_REPO: "GitHub:zkldi/Tachi"
           VITE_RECAPTCHA_KEY: "6LcsYbIpAAAAAEJffjIXmbQcxj_SBZG7BnSPjF4L"
           TACHI_NAME: "Kamaitachi"
diff --git a/db/migrations/20260517120000_clear_showcase_orphan_refs.sql b/db/migrations/20260517120000_clear_showcase_orphan_refs.sql
new file mode 100644
index 000000000..99d5e32b3
--- /dev/null
+++ b/db/migrations/20260517120000_clear_showcase_orphan_refs.sql
@@ -0,0 +1,38 @@
+-- Remove showcase entries that reference deleted charts or folders (slug + game).
+-- `game_profile.showcase` is a JSONB array; chart entries use mode "chart" + chartID;
+-- folder entries use mode "folder" + slug, scoped to game_profile.game.
+
+UPDATE game_profile AS gp
+SET showcase = cleaned.new_showcase
+FROM (
+	SELECT
+		gp_inner.user_id,
+		gp_inner.game,
+		COALESCE(
+			(
+				SELECT jsonb_agg(t.elem ORDER BY t.ordinality)
+				FROM jsonb_array_elements(gp_inner.showcase) WITH ORDINALITY AS t(elem, ordinality)
+				WHERE CASE t.elem->>'mode'
+					WHEN 'chart' THEN EXISTS (
+						SELECT 1
+						FROM chart AS c
+						WHERE c.id = t.elem->>'chartID'
+					)
+					WHEN 'folder' THEN EXISTS (
+						SELECT 1
+						FROM folder AS f
+						WHERE f.game = gp_inner.game
+							AND f.slug = t.elem->>'slug'
+					)
+					ELSE TRUE
+				END
+			),
+			'[]'::jsonb
+		) AS new_showcase
+	FROM game_profile AS gp_inner
+	WHERE jsonb_typeof(gp_inner.showcase) = 'array'
+		AND jsonb_array_length(gp_inner.showcase) > 0
+) AS cleaned
+WHERE gp.user_id = cleaned.user_id
+	AND gp.game = cleaned.game
+	AND gp.showcase IS DISTINCT FROM cleaned.new_showcase;