DB에 thumbnail 테이블 추가

src/lib/server/db/schema/media.ts

@@ -0,0 +1,17 @@
+import type { ColumnType, Generated } from "kysely";
+
+interface ThumbnailTable {
+  id: Generated<number>;
+  directory_id: number | null;
+  file_id: number | null;
+  category_id: number | null;
+  path: string;
+  created_at: ColumnType<Date, Date, never>;
+  encrypted_content_iv: string; // Base64
+}
+
+declare module "./index" {
+  interface Database {
+    thumbnail: ThumbnailTable;
+  }
+}