Remove unneccessary warning, refs #577, #585

Author: simonw

docs/cli-reference.rst

@@ -1188,8 +1188,6 @@ See :ref:`cli_add_foreign_key`.
 
           sqlite-utils add-foreign-key my.db books author_id authors id
 
-      WARNING: Could corrupt your database! Back up your database file first.
-
     Options:
       --ignore               If foreign key already exists, do nothing
       --load-extension TEXT  Path to SQLite extension, with optional :entrypoint

sqlite_utils/cli.py

@@ -491,8 +491,6 @@ def add_foreign_key(
     Example:
 
         sqlite-utils add-foreign-key my.db books author_id authors id
-
-    WARNING: Could corrupt your database! Back up your database file first.
     """
     db = sqlite_utils.Database(path)
     _load_extensions(db, load_extension)