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%% TYPES %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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-type db_user() :: ({'user', any()} | 'admin' | 'any').

-record
(
   set_field,
   {
      field :: non_neg_integer(),
      value :: any()
   }
).

-record
(
   add_to_field,
   {
      field :: non_neg_integer(),
      values :: list(any()),
      head :: boolean()
   }
).

-record
(
   update_indexed,
   {
      field :: non_neg_integer(),
      ix :: non_neg_integer(),
      ops :: list(db_query_op())
   }
).

-record
(
   set_user,
   {
      user :: db_user()
   }
).

-record
(
   db_query,
   {
      db :: atom(),
      id :: any(),
      user :: db_user(),
      ops :: list(db_query_master_op())
   }
).

-type db_query_op() :: (#set_field{} | #add_to_field{} | #update_indexed{}).
-type db_query_master_op() :: (db_query_op() | #set_user{}).
-type db_query() :: #db_query{}.