diff --git a/scripts/run-stand-api-tests.sh b/scripts/run-stand-api-tests.sh
index 78c2ba7..51aff91 100644
--- a/scripts/run-stand-api-tests.sh
+++ b/scripts/run-stand-api-tests.sh
@@ -2,6 +2,11 @@
 # Full API CT suite against live stand (remote) + smoke-core on stand host.
 # Usage: run-stand-api-tests.sh <ift|stage>
 # Requires: ADMIN_* from load-stand-api-env.sh; SSH_* for smoke-core on stand.
+#
+# Litter cleanup: after each CT suite, api_test_runner:cleanup_tracked/0
+# soft-deletes tracked calendars/users via admin API (and @test.local safety-net).
+# Skip teardown: CT_KEEP_DATA=1 (data remains on the stand).
+# Soft-delete ≠ hard wipe; full clean slate = ops Mnesia volume wipe.
 set -euo pipefail
 
 STAND="${1:?stand: ift|stage}"
@@ -134,6 +139,7 @@ docker run --rm --network=host \
   -e "ADMIN_MODER_PASSWORD=${ADMIN_MODER_PASSWORD:-}" \
   -e "ADMIN_SUPPORT_EMAIL=${ADMIN_SUPPORT_EMAIL:-}" \
   -e "ADMIN_SUPPORT_PASSWORD=${ADMIN_SUPPORT_PASSWORD:-}" \
+  -e "CT_KEEP_DATA=${CT_KEEP_DATA:-}" \
   "${IMAGE}"
 CT_RC=$?
 set -e
diff --git a/test/api/api_test_runner.erl b/test/api/api_test_runner.erl
index a5b8d29..7394ece 100644
--- a/test/api/api_test_runner.erl
+++ b/test/api/api_test_runner.erl
@@ -52,6 +52,13 @@
 -export([verify_user/2]).
 -export([future_date_iso8601/0, iso8601_utc/1, future_month_range_iso8601/0,
   next_month_start_iso8601/0, next_month_range_iso8601/0]).
+-export([
+  track_user/1,
+  track_calendar/1,
+  cleanup_tracked/0,
+  keep_ct_data/0,
+  reset_litter_tracker/0
+]).
 
 %%%===================================================================
 %%% Конфигурация окружения (CT_MODE, ...)
@@ -125,6 +132,127 @@ clear_cached_admin_tokens() ->
     [admin, superadmin, moderator, support]
   ).
 
+%%%===================================================================
+%%% Litter tracker (users/calendars created during CT)
+%%% persistent_term — survives CT testcase process exits (unlike ETS owner).
+%%%===================================================================
+
+-define(LITTER_USERS, {?MODULE, tracked_users}).
+-define(LITTER_CALS, {?MODULE, tracked_calendars}).
+
+%% @doc CT_KEEP_DATA=1 — skip suite teardown soft-delete (default: clean up).
+-spec keep_ct_data() -> boolean().
+keep_ct_data() ->
+  case os:getenv("CT_KEEP_DATA") of
+    "1" -> true;
+    "true" -> true;
+    "yes" -> true;
+    _ -> false
+  end.
+
+-spec reset_litter_tracker() -> ok.
+reset_litter_tracker() ->
+  persistent_term:put(?LITTER_USERS, []),
+  persistent_term:put(?LITTER_CALS, []),
+  ok.
+
+-spec track_user(binary()) -> ok.
+track_user(UserId) when is_binary(UserId), UserId =/= <<>> ->
+  track_id(?LITTER_USERS, UserId);
+track_user(_) ->
+  ok.
+
+-spec track_calendar(binary()) -> ok.
+track_calendar(CalId) when is_binary(CalId), CalId =/= <<>> ->
+  track_id(?LITTER_CALS, CalId);
+track_calendar(_) ->
+  ok.
+
+track_id(Key, Id) ->
+  Old = persistent_term:get(Key, []),
+  case lists:member(Id, Old) of
+    true -> ok;
+    false -> persistent_term:put(Key, [Id | Old]), ok
+  end.
+
+%% @doc Soft-delete tracked calendars then users via admin API.
+%% Best-effort: never fails the suite. No-op when CT_KEEP_DATA=1.
+-spec cleanup_tracked() -> ok.
+cleanup_tracked() ->
+  case keep_ct_data() of
+    true ->
+      ct:pal("CT_KEEP_DATA set — skip API CT litter cleanup"),
+      ok;
+    false ->
+      do_cleanup_tracked()
+  end.
+
+do_cleanup_tracked() ->
+  CalIds = lists:usort(persistent_term:get(?LITTER_CALS, [])),
+  UserIds = lists:usort(persistent_term:get(?LITTER_USERS, [])),
+  ct:pal("API CT litter cleanup: ~p calendars, ~p users", [length(CalIds), length(UserIds)]),
+  AdminToken =
+    try get_admin_token()
+    catch
+      _:Reason ->
+        ct:pal("API CT litter cleanup: no admin token (~p) — skip", [Reason]),
+        undefined
+    end,
+  case AdminToken of
+    undefined ->
+      ok;
+    Token ->
+      lists:foreach(
+        fun(Id) ->
+          admin_delete_best_effort(<<"/v1/admin/calendars/", Id/binary>>, Token)
+        end,
+        CalIds
+      ),
+      lists:foreach(
+        fun(Id) ->
+          admin_delete_best_effort(<<"/v1/admin/users/", Id/binary>>, Token)
+        end,
+        UserIds
+      ),
+      cleanup_test_local_users(Token),
+      reset_litter_tracker(),
+      ok
+  end.
+
+%% Safety-net: soft-delete users with @test.local (missed by tracker).
+cleanup_test_local_users(AdminToken) ->
+  case admin_request(get, <<"/v1/admin/users?q=test.local&limit=100">>, AdminToken) of
+    {ok, 200, _, Body} ->
+      Users = jsx:decode(list_to_binary(Body), [return_maps]),
+      lists:foreach(
+        fun
+          (#{<<"id">> := Id, <<"email">> := Email}) when is_binary(Email) ->
+            case binary:match(Email, <<"@test.local">>) of
+              nomatch -> ok;
+              _ -> admin_delete_best_effort(<<"/v1/admin/users/", Id/binary>>, AdminToken)
+            end;
+          (_) ->
+            ok
+        end,
+        case Users of
+          L when is_list(L) -> L;
+          _ -> []
+        end
+      );
+    Other ->
+      ct:pal("API CT litter cleanup: list users skip (~p)", [Other]),
+      ok
+  end.
+
+admin_delete_best_effort(Path, Token) ->
+  case admin_request(delete, Path, Token) of
+    {ok, Status, _, _} when Status >= 200, Status < 300 -> ok;
+    {ok, 404, _, _} -> ok;
+    Other ->
+      ct:pal("API CT litter cleanup: DELETE ~s -> ~p", [Path, Other]),
+      ok
+  end.
+
 %%%===================================================================
 %%% Учётные данные администраторов (из переменных окружения)
 %%%===================================================================
@@ -395,6 +523,7 @@ register_and_login(Email, Password) ->
     jsx:encode(#{email => Email, password => Password})),
   {ok, 201, _, Body} = Resp,
   #{<<"user">> := #{<<"id">> := UserId}} = jsx:decode(list_to_binary(Body), [return_maps]),
+  track_user(UserId),
 
   % 2. Получаем админский токен (используется кеширование)
   AdminToken = get_admin_token(),
@@ -429,6 +558,12 @@ create_calendar(Token, Params) ->
   case client_request(post, <<"/v1/calendars">>, Token, Body) of
     {ok, 201, _, RespBody} ->
       #{<<"id">> := CalId} = jsx:decode(list_to_binary(RespBody), [return_maps]),
+      %% Personal Default is sole — do not track for delete (403 default_calendar).
+      case Type of
+        <<"personal">> -> ok;
+        personal -> ok;
+        _ -> track_calendar(CalId)
+      end,
       CalId;
     {ok, 409, _, _} when Type =:= <<"personal">>; Type =:= personal ->
       %% Sole Default personal already exists — reuse it.
diff --git a/test/api_admins_SUITE.erl b/test/api_admins_SUITE.erl
index aa6a9ad..e41b063 100644
--- a/test/api_admins_SUITE.erl
+++ b/test/api_admins_SUITE.erl
@@ -46,6 +46,7 @@ all() ->
 %% @doc Инициализация сьюта.
 %% В локальном режиме запускает приложение EventHub.
 init_per_suite(Config) ->
+  ok = api_test_runner:reset_litter_tracker(),
   case os:getenv("CT_MODE", "local") of
     "remote" ->
       ct:pal("Remote mode: assuming application is already running"),
@@ -72,8 +73,11 @@ init_per_suite(Config) ->
       end
   end.
 
-%% @doc Завершение сьюта. В локальном режиме останавливает приложение.
+%% @doc Завершение сьюта: litter cleanup, затем stop app в local.
 end_per_suite(Config) ->
+  %% Soft-delete tracked @test.local users/calendars (remote and local).
+  %% Skip with CT_KEEP_DATA=1. Must run before application:stop.
+  catch api_test_runner:cleanup_tracked(),
   case proplists:get_value(started_by_us, Config, false) andalso
     os:getenv("CT_MODE", "local") =/= "remote" of
     true ->
diff --git a/test/api_users_SUITE.erl b/test/api_users_SUITE.erl
index f8ebca1..8328c2f 100755
--- a/test/api_users_SUITE.erl
+++ b/test/api_users_SUITE.erl
@@ -55,6 +55,7 @@ all() ->
 %% @doc Инициализация сьюта.
 %% В локальном режиме запускает приложение EventHub.
 init_per_suite(Config) ->
+  ok = api_test_runner:reset_litter_tracker(),
   case os:getenv("CT_MODE", "local") of
     "remote" ->
       ct:pal("Remote mode: assuming application is already running"),
@@ -81,8 +82,11 @@ init_per_suite(Config) ->
       end
   end.
 
-%% @doc Завершение сьюта. В локальном режиме останавливает приложение.
+%% @doc Завершение сьюта: litter cleanup, затем stop app в local.
 end_per_suite(Config) ->
+  %% Soft-delete tracked @test.local users/calendars (remote and local).
+  %% Skip with CT_KEEP_DATA=1. Must run before application:stop.
+  catch api_test_runner:cleanup_tracked(),
   case proplists:get_value(started_by_us, Config, false) andalso
     os:getenv("CT_MODE", "local") =/= "remote" of
     true ->