nixpkgs/pkgs/servers/calibre-web/db-migrations.patch

diff --git a/cps/__init__.py b/cps/__init__.py
index 1ba1f778..fd5dc2f1 100644
--- a/cps/__init__.py
+++ b/cps/__init__.py
@@ -116,6 +116,9 @@ def create_app():
     db.CalibreDB.setup_db(config.config_calibre_dir, cli_param.settings_path)
     calibre_db.init_db()

+    if os.environ.get('__RUN_MIGRATIONS_AND_EXIT'):
+        sys.exit(0)
+
     updater_thread.init_updater(config, web_server)
     # Perform dry run of updater and exit afterwards
     if cli_param.dry_run: