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src/pig_obs_session_ffi.erl
-module(pig_obs_session_ffi).
-export([iso_timestamp/0]).
%% Get current ISO 8601 timestamp (RFC3339 format).
%% Returns a binary (string) instead of a charlist.
iso_timestamp() ->
Charlist = calendar:system_time_to_rfc3339(os:system_time(second), []),
unicode:characters_to_binary(Charlist, utf8).