restore composer.json, add mysqli extension

config/settings/common.py

@@ -49,6 +49,7 @@ INSTALLED_APPS = [
     "django.contrib.sessions",
     "django.contrib.messages",
     "django.contrib.staticfiles",
+    "django.contrib.postgres",
 ] + APPS
 
 MODULES = [app for app in MODULES if isinstance(app, str)]