diff --git a/nix/module.nix b/nix/module.nix
index d759468..2fa939f 100644
--- a/nix/module.nix
+++ b/nix/module.nix
@@ -139,24 +139,29 @@ in
       };
       script = ''
         set -eu
-
-        # Copy the immutable store package into a writable app root.
-        # Symlinking would defeat Laravel's __DIR__ based path
-        # resolution: PHP's __DIR__ follows symlinks back to the
-        # read only store, breaking storage/ and bootstrap/cache/
-        # writes even when those subtrees are themselves symlinked
-        # into a writable state dir.
         rm -rf ${appRoot}
         mkdir -p ${appRoot}
-        cp -rL ${cfg.backendPackage}/share/php/tide-backend/. ${appRoot}/
-        chmod -R u+w ${appRoot}
-
-        # Redirect the two mutable subtrees to /var/lib/tide/state
-        # so they survive activations and don't accumulate inside
-        # the disposable app root copy.
-        rm -rf ${appRoot}/storage ${appRoot}/bootstrap/cache
-        ln -sfn ${stateRoot}/storage ${appRoot}/storage
+        for entry in ${cfg.backendPackage}/share/php/tide-backend/*; do
+          name="$(basename "$entry")"
+          case "$name" in
+            storage|bootstrap)
+              ;;
+            *)
+              ln -s "$entry" "${appRoot}/$name"
+              ;;
+          esac
+        done
+        # bootstrap dir: symlink everything from the store
+        # except cache/ which must be writable.
+        mkdir -p ${appRoot}/bootstrap
+        for entry in ${cfg.backendPackage}/share/php/tide-backend/bootstrap/*; do
+          name="$(basename "$entry")"
+          if [ "$name" != "cache" ]; then
+            ln -sf "$entry" "${appRoot}/bootstrap/$name"
+          fi
+        done
         ln -sfn ${stateRoot}/bootstrap-cache ${appRoot}/bootstrap/cache
+        ln -sfn ${stateRoot}/storage ${appRoot}/storage
 
         chown -R ${cfg.user}:${cfg.group} ${appRoot} ${stateRoot}
       '';