add version to all cmd files

src/calibre/db/cli/cmd_add.py

@@ -18,7 +18,7 @@ from calibre.srv.changes import books_added
 from calibre.utils.localization import canonicalize_lang
 
 readonly = False
-
+version = 0  # change this if you change signature of implementation()
 
 def to_stream(data):
     ans = BytesIO(data[1])

src/calibre/db/cli/cmd_add_format.py

@@ -10,6 +10,7 @@ from io import BytesIO
 from calibre.srv.changes import formats_added
 
 readonly = False
+version = 0  # change this if you change signature of implementation()
 
 
 def implementation(db, notify_changes, book_id, data, fmt, replace):

src/calibre/db/cli/cmd_list.py

@@ -15,6 +15,7 @@ from calibre.ebooks.metadata import authors_to_string
 from calibre.utils.date import isoformat
 
 readonly = True
+version = 0  # change this if you change signature of implementation()
 FIELDS = {
     'title', 'authors', 'author_sort', 'publisher', 'rating', 'timestamp', 'size',
     'tags', 'comments', 'series', 'series_index', 'formats', 'isbn', 'uuid',

src/calibre/db/cli/cmd_remove.py

@@ -8,6 +8,7 @@ from calibre.db.delete_service import delete_service
 from calibre.srv.changes import books_deleted
 
 readonly = False
+version = 0  # change this if you change signature of implementation()
 
 
 def implementation(db, notify_changes, ids, permanent):