implement ensure_vms_and_db_are_synced in cron task and add default

sender to readme

capsulflask/cli.py

@@ -243,5 +243,36 @@ def notify_users_about_account_balance():
 
 
 def ensure_vms_and_db_are_synced():
-  db_ids = get_model().all_vm_ids()
-  #virt_ids = current_app.config["VIRTUALIZATION_MODEL"].
+  db_ids = get_model().all_non_deleted_vm_ids()
+  virt_ids = current_app.config["VIRTUALIZATION_MODEL"].list_ids()
+
+  db_ids_dict = dict()
+  virt_ids_dict = dict()
+
+  for id in db_ids:
+    db_ids_dict[id] = True
+  
+  for id in virt_ids:
+    virt_ids_dict[id] = True
+
+  errors = list()
+
+  for id in db_ids_dict:
+    if id not in virt_ids_dict:
+      errors.append(f"{id} is in the database but not in the virtualization model")
+
+  for id in virt_ids_dict:
+    if id not in db_ids_dict:
+      errors.append(f"{id} is in the virtualization model but not in the database")
+
+  if len(errors) > 0:
+    email_addresses_raw = current_app.config['ADMIN_EMAIL_ADDRESSES'].split(",")
+    email_addresses = list(filter(lambda x: len(x) > 6, map(lambda x: x.strip(), email_addresses_raw ) ))
+    current_app.config["FLASK_MAIL_INSTANCE"].send(
+        Message(
+          "Capsul Consistency Check Failed",
+          body="\n".join(errors),
+          recipients=email_addresses
+        )
+    )
+