diff --git a/src/common_lib.py b/src/common_lib.py
index 4804c48..8a6fdd9 100755
--- a/src/common_lib.py
+++ b/src/common_lib.py
@@ -137,7 +137,14 @@ def mv(path, to, printOmitPrefix=None):
     Path(path).rename(to)
 
 
-def rm(path):
+def rm_file(file_path):
+    try:
+        os.remove(file_path)
+    except FileNotFoundError:
+        pass
+
+
+def rm_dir(path):
     try:
         shutil.rmtree(path)
     except Exception:
diff --git a/src/html_index.py b/src/html_index.py
index 641248c..0e4b2ea 100755
--- a/src/html_index.py
+++ b/src/html_index.py
@@ -60,7 +60,7 @@ def gen_page(arr, base, page_id=1, total=1):
 def process(per_page=60):
     print('generating app-index ...')
     index_dir = mylib.path_out('index', 'page')
-    mylib.rm(index_dir)
+    mylib.rm_dir(index_dir)
     mylib.mkdir(index_dir)
 
     apps = [gen_obj(x) for x in mylib.enum_appids()]
diff --git a/src/json_reverse_index.py b/src/json_reverse_index.py
new file mode 100755
index 0000000..2a899c7
--- /dev/null
+++ b/src/json_reverse_index.py
@@ -0,0 +1,67 @@
+#!/usr/bin/env python3
+
+import sys
+import common_lib as mylib
+
+
+def get_index_path():
+    pth = mylib.path_root('data', '_eval')
+    mylib.mkdir(pth)
+    return mylib.path_add(pth, 'reverse_index.json')
+
+
+def load_index_json(file_path):
+    if mylib.file_exists(file_path):
+        json = mylib.json_read(file_path)
+    else:
+        json = dict({'pardom': dict(), 'subdom': dict()})
+    return json
+
+
+def delete_from_index(index, bundle_ids):
+    for key in ['pardom', 'subdom']:
+        for domain in list(index[key].keys()):
+            for bid in bundle_ids:
+                try:
+                    index[key][domain].remove(bid)
+                except ValueError:
+                    pass  # ignore if not present
+            if not index[key][domain]:
+                del(index[key][domain])
+
+
+def insert_in_index(index, bundle_ids):
+    for bid in bundle_ids:
+        json, _ = mylib.json_read_evaluated(bid)
+        for key in ['pardom', 'subdom']:  # assuming keys are identical
+            for domain, _, _ in json[key]:
+                try:
+                    index[key][domain].append(bid)
+                except KeyError:
+                    index[key][domain] = [bid]
+
+
+def process(bundle_ids, deleteOnly=False):
+    print('writing reverse index ...')
+    index_file = get_index_path()
+    if bundle_ids == ['*']:
+        bundle_ids = list(mylib.enum_data_appids())
+        mylib.rm_file(index_file)  # rebuild from ground up
+    # load previous index
+    json = load_index_json(index_file)
+    # delete previous index entries
+    delete_from_index(json, bundle_ids)
+    # write new index to disk
+    if not deleteOnly:
+        insert_in_index(json, bundle_ids)
+    mylib.json_write(index_file, json, pretty=False)
+    print('')
+
+
+if __name__ == '__main__':
+    args = sys.argv[1:]
+    if len(args) > 0:
+        process(args)
+    else:
+        # process(['*'])
+        mylib.usage(__file__, '[bundle_id] [...]')
diff --git a/src/main.py b/src/main.py
index cc70943..e931f69 100755
--- a/src/main.py
+++ b/src/main.py
@@ -1,6 +1,5 @@
 #!/usr/bin/env python3
 
-import os
 import sys
 import traceback
 import common_lib as mylib
@@ -9,6 +8,7 @@ import bundle_download
 import html_root
 import html_index
 import html_bundle
+import json_reverse_index
 import tracker_download
 
 
@@ -41,9 +41,10 @@ def del_id(bundle_ids):
         dest = mylib.path_out_app(bid)
         if mylib.dir_exists(dest):
             print('  ' + bid)
-            mylib.rm(dest)
+            mylib.rm_dir(dest)
             update_index = True
     print('')
+    json_reverse_index.process(bundle_ids, deleteOnly=True)
     if update_index:
         rebuild_index()
 
@@ -51,7 +52,10 @@ def del_id(bundle_ids):
 def combine_and_update(bundle_ids, where=None):
     new_ids = bundle_download.process(bundle_ids)
     affected = bundle_combine.process(bundle_ids, where=where)
+    if not where and bundle_ids == ['*']:
+        affected = ['*']
     if len(affected) > 0:
+        json_reverse_index.process(affected)
         html_bundle.process(affected)
     else:
         print('no bundle affected by tracker, not generating bundle html')
@@ -82,10 +86,7 @@ def import_update():
     if len(then_delete) > 0:
         print('cleanup _in folder ...')
         for x in then_delete:
-            try:
-                os.remove(fname)
-            except FileNotFoundError:
-                pass
+            mylib.rm_file(fname)
         print('')