fix(mnesia): per-slot volumes hint and harden verification lookup.

Avoid shared Mnesia dir across replicas; make get_or_create_token and CT verify_user resilient to brief cross-node lag.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/infra/infra_mnesia.erl

@@ -229,7 +229,7 @@ add_local_ram_copy(Tab) ->
   end.
 
 wait_for_tables_available() ->
-  lists:foreach(fun(Tab) -> wait_for_table(Tab) end, ?DISC_TABLES).
+  lists:foreach(fun(Tab) -> wait_for_table(Tab) end, ?DISC_TABLES ++ ?RAM_TABLES).
 
 wait_for_table(Tab) ->
   case lists:member(Tab, mnesia:system_info(tables)) of
@@ -260,6 +260,12 @@ prune_dead_nodes() ->
         false -> ok
       end
                   end, ?DISC_TABLES),
+    lists:foreach(fun(Tab) ->
+      case lists:member(Node, mnesia:table_info(Tab, ram_copies)) of
+        true -> catch mnesia:del_table_copy(Tab, Node);
+        false -> ok
+      end
+                  end, ?RAM_TABLES),
     catch mnesia:del_table_copy(schema, Node)
                 end, DeadNodes).
 
@@ -327,6 +333,7 @@ create_indices() ->
   mnesia:add_table_index(calendar_specialist, user_id),
   mnesia:add_table_index(user, nickname),
   mnesia:add_table_index(user, email),
+  mnesia:add_table_index(verification, user_id),
   mnesia:add_table_index(notification, user_id),
   mnesia:add_table_index(notification, is_read),
   mnesia:add_table_index(auth_session, family_id),