implement account locking/unlocking

db/structure.sql

@@ -95,7 +95,8 @@ CREATE TABLE public.accounts (
     slug character varying,
     plan_uid character varying,
     created_at timestamp without time zone NOT NULL,
-    updated_at timestamp without time zone NOT NULL
+    updated_at timestamp without time zone NOT NULL,
+    locked boolean DEFAULT false
 );
 
 
@@ -4027,6 +4028,7 @@ INSERT INTO "schema_migrations" (version) VALUES
 ('20200812060406'),
 ('20200819070738'),
 ('20200820082501'),
-('20200824171649');
+('20200824171649'),
+('20200908085319');