diff --git a/include/records.hrl b/include/records.hrl
index f5407d9..f8bcfd0 100755
--- a/include/records.hrl
+++ b/include/records.hrl
@@ -103,10 +103,27 @@
   updated_at      :: calendar:datetime()
 }).
 
+%% PK = id. Уникальность пары calendar_id+user_id — в logic.
 -record(calendar_share, {
-  calendar_id     :: binary(),
-  user_id         :: binary(),
-  rights          :: read | write | admin
+  id                :: binary(),
+  calendar_id       :: binary(),
+  user_id           :: binary(),
+  rights            :: read | write | admin,
+  mirror_to_default :: boolean()
+}).
+
+%% Приглашения к calendar_share (соредактор / заместитель).
+-record(calendar_share_invite, {
+  id                :: binary(),
+  calendar_id       :: binary(),
+  inviter_id        :: binary(),
+  invitee_user_id   :: binary(),              % <<>> если ещё неизвестен
+  invitee_email     :: binary(),              % <<>> если только user_id
+  rights            :: read | write | admin,
+  status            :: pending | accepted | declined | expired | cancelled,
+  token             :: binary(),
+  created_at        :: calendar:datetime(),
+  expires_at        :: calendar:datetime()
 }).
 
 %% Follow чужого календаря (не путать с платной subscription / calendar_share)
diff --git a/src/core/core_calendar_share.erl b/src/core/core_calendar_share.erl
new file mode 100644
index 0000000..14f415a
--- /dev/null
+++ b/src/core/core_calendar_share.erl
@@ -0,0 +1,112 @@
+%%%-------------------------------------------------------------------
+%%% @doc Хранение grants calendar_share (соредактор / заместитель).
+%%% @end
+%%%-------------------------------------------------------------------
+-module(core_calendar_share).
+-include("records.hrl").
+
+-export([upsert/4, get/2, list_by_calendar/1, list_by_user/1,
+  delete/2, update_rights/3, update_mirror/3]).
+
+-spec upsert(CalendarId :: binary(), UserId :: binary(),
+    Rights :: read | write | admin, Mirror :: boolean()) ->
+  {ok, #calendar_share{}} | {error, term()}.
+upsert(CalendarId, UserId, Rights, Mirror) ->
+  F = fun() ->
+    case find(CalendarId, UserId) of
+      [#calendar_share{} = Existing] ->
+        Updated = Existing#calendar_share{
+          rights = Rights,
+          mirror_to_default = Mirror
+        },
+        mnesia:write(Updated),
+        {ok, Updated};
+      [] ->
+        Rec = #calendar_share{
+          id = infra_utils:generate_id(16),
+          calendar_id = CalendarId,
+          user_id = UserId,
+          rights = Rights,
+          mirror_to_default = Mirror
+        },
+        mnesia:write(Rec),
+        {ok, Rec}
+    end
+  end,
+  case mnesia:transaction(F) of
+    {atomic, Result} -> Result;
+    {aborted, Reason} -> {error, Reason}
+  end.
+
+-spec get(CalendarId :: binary(), UserId :: binary()) ->
+  {ok, #calendar_share{}} | {error, not_found}.
+get(CalendarId, UserId) ->
+  case find_dirty(CalendarId, UserId) of
+    [Rec] -> {ok, Rec};
+    [] -> {error, not_found}
+  end.
+
+-spec list_by_calendar(CalendarId :: binary()) -> [#calendar_share{}].
+list_by_calendar(CalendarId) ->
+  mnesia:dirty_match_object(#calendar_share{calendar_id = CalendarId, _ = '_'}).
+
+-spec list_by_user(UserId :: binary()) -> [#calendar_share{}].
+list_by_user(UserId) ->
+  mnesia:dirty_match_object(#calendar_share{user_id = UserId, _ = '_'}).
+
+-spec delete(CalendarId :: binary(), UserId :: binary()) -> ok | {error, not_found | term()}.
+delete(CalendarId, UserId) ->
+  F = fun() ->
+    case find(CalendarId, UserId) of
+      [] -> {error, not_found};
+      [#calendar_share{id = Id}] ->
+        mnesia:delete({calendar_share, Id}),
+        ok
+    end
+  end,
+  case mnesia:transaction(F) of
+    {atomic, Result} -> Result;
+    {aborted, Reason} -> {error, Reason}
+  end.
+
+-spec update_rights(CalendarId :: binary(), UserId :: binary(),
+    Rights :: read | write | admin) ->
+  {ok, #calendar_share{}} | {error, not_found | term()}.
+update_rights(CalendarId, UserId, Rights) ->
+  F = fun() ->
+    case find(CalendarId, UserId) of
+      [] -> {error, not_found};
+      [#calendar_share{} = Rec] ->
+        Updated = Rec#calendar_share{rights = Rights},
+        mnesia:write(Updated),
+        {ok, Updated}
+    end
+  end,
+  case mnesia:transaction(F) of
+    {atomic, Result} -> Result;
+    {aborted, Reason} -> {error, Reason}
+  end.
+
+-spec update_mirror(CalendarId :: binary(), UserId :: binary(), Mirror :: boolean()) ->
+  {ok, #calendar_share{}} | {error, not_found | term()}.
+update_mirror(CalendarId, UserId, Mirror) ->
+  F = fun() ->
+    case find(CalendarId, UserId) of
+      [] -> {error, not_found};
+      [#calendar_share{} = Rec] ->
+        Updated = Rec#calendar_share{mirror_to_default = Mirror},
+        mnesia:write(Updated),
+        {ok, Updated}
+    end
+  end,
+  case mnesia:transaction(F) of
+    {atomic, Result} -> Result;
+    {aborted, Reason} -> {error, Reason}
+  end.
+
+find(CalendarId, UserId) ->
+  mnesia:match_object(#calendar_share{calendar_id = CalendarId, user_id = UserId, _ = '_'}).
+
+find_dirty(CalendarId, UserId) ->
+  mnesia:dirty_match_object(
+    #calendar_share{calendar_id = CalendarId, user_id = UserId, _ = '_'}).
diff --git a/src/core/core_calendar_share_invite.erl b/src/core/core_calendar_share_invite.erl
new file mode 100644
index 0000000..8dc9123
--- /dev/null
+++ b/src/core/core_calendar_share_invite.erl
@@ -0,0 +1,90 @@
+%%%-------------------------------------------------------------------
+%%% @doc Хранение приглашений calendar_share.
+%%% @end
+%%%-------------------------------------------------------------------
+-module(core_calendar_share_invite).
+-include("records.hrl").
+
+-export([create/1, get_by_id/1, get_by_token/1, list_by_calendar/1,
+  list_by_invitee/1, list_by_email/1, update_status/2, find_pending/3,
+  write/1]).
+
+-spec create(#calendar_share_invite{}) ->
+  {ok, #calendar_share_invite{}} | {error, term()}.
+create(Rec) ->
+  F = fun() ->
+    mnesia:write(Rec),
+    {ok, Rec}
+  end,
+  case mnesia:transaction(F) of
+    {atomic, Result} -> Result;
+    {aborted, Reason} -> {error, Reason}
+  end.
+
+-spec write(#calendar_share_invite{}) -> ok.
+write(Rec) ->
+  mnesia:dirty_write(Rec).
+
+-spec get_by_id(Id :: binary()) ->
+  {ok, #calendar_share_invite{}} | {error, not_found}.
+get_by_id(Id) ->
+  case mnesia:dirty_read(calendar_share_invite, Id) of
+    [Rec] -> {ok, Rec};
+    [] -> {error, not_found}
+  end.
+
+-spec get_by_token(Token :: binary()) ->
+  {ok, #calendar_share_invite{}} | {error, not_found}.
+get_by_token(Token) ->
+  case mnesia:dirty_index_read(calendar_share_invite, Token,
+                               #calendar_share_invite.token) of
+    [Rec] -> {ok, Rec};
+    [] -> {error, not_found};
+    [Rec | _] -> {ok, Rec}
+  end.
+
+-spec list_by_calendar(CalendarId :: binary()) -> [#calendar_share_invite{}].
+list_by_calendar(CalendarId) ->
+  mnesia:dirty_match_object(
+    #calendar_share_invite{calendar_id = CalendarId, _ = '_'}).
+
+-spec list_by_invitee(UserId :: binary()) -> [#calendar_share_invite{}].
+list_by_invitee(UserId) ->
+  mnesia:dirty_match_object(
+    #calendar_share_invite{invitee_user_id = UserId, _ = '_'}).
+
+-spec list_by_email(Email :: binary()) -> [#calendar_share_invite{}].
+list_by_email(Email) ->
+  mnesia:dirty_match_object(
+    #calendar_share_invite{invitee_email = Email, _ = '_'}).
+
+-spec update_status(Id :: binary(), Status :: atom()) ->
+  {ok, #calendar_share_invite{}} | {error, not_found | term()}.
+update_status(Id, Status) ->
+  F = fun() ->
+    case mnesia:read(calendar_share_invite, Id) of
+      [] ->
+        {error, not_found};
+      [Rec] ->
+        Updated = Rec#calendar_share_invite{status = Status},
+        mnesia:write(Updated),
+        {ok, Updated}
+    end
+  end,
+  case mnesia:transaction(F) of
+    {atomic, Result} -> Result;
+    {aborted, Reason} -> {error, Reason}
+  end.
+
+-spec find_pending(CalendarId :: binary(), UserId :: binary(), Email :: binary()) ->
+  [#calendar_share_invite{}].
+find_pending(CalendarId, UserId, Email) ->
+  All = list_by_calendar(CalendarId),
+  [I || I <- All, I#calendar_share_invite.status =:= pending,
+        matches_pending(I, UserId, Email)].
+
+matches_pending(#calendar_share_invite{invitee_user_id = U}, UserId, _)
+  when UserId =/= <<>>, U =:= UserId -> true;
+matches_pending(#calendar_share_invite{invitee_email = E}, _, Email)
+  when Email =/= <<>>, E =/= <<>>, E =:= Email -> true;
+matches_pending(_, _, _) -> false.
diff --git a/src/eventhub_app.erl b/src/eventhub_app.erl
index e425059..f39767b 100755
--- a/src/eventhub_app.erl
+++ b/src/eventhub_app.erl
@@ -102,6 +102,8 @@ start_http() ->
       {"/v1/user/reviews", handler_user_reviews, []},
       {"/v1/user/following", handler_user_following, []},
       {"/v1/user/specialist-invites", handler_specialist_invites, []},
+      {"/v1/user/share-invites", handler_share_invites, []},
+      {"/v1/user/shares/:calendar_id", handler_calendar_shares, []},
       {"/v1/users/lookup", handler_users_lookup, []},
       {"/v1/search", handler_search, []},
       {"/v1/calendars", handler_calendars, []},
@@ -112,9 +114,16 @@ start_http() ->
       {"/v1/calendars/:id/specialists/:user_id", handler_calendar_specialists, []},
       {"/v1/calendars/:id/specialist-invites", handler_calendar_specialist_invites, []},
       {"/v1/calendars/:id/specialist-invites/:invite_id", handler_calendar_specialist_invites, []},
+      {"/v1/calendars/:id/share-invites", handler_calendar_share_invites, []},
+      {"/v1/calendars/:id/share-invites/:invite_id", handler_calendar_share_invites, []},
+      {"/v1/calendars/:id/shares", handler_calendar_shares, []},
+      {"/v1/calendars/:id/shares/:user_id", handler_calendar_shares, []},
       {"/v1/specialist-invites/accept", handler_specialist_invites, []},
       {"/v1/specialist-invites/:id/accept", handler_specialist_invites, []},
       {"/v1/specialist-invites/:id/decline", handler_specialist_invites, []},
+      {"/v1/share-invites/accept", handler_share_invites, []},
+      {"/v1/share-invites/:id/accept", handler_share_invites, []},
+      {"/v1/share-invites/:id/decline", handler_share_invites, []},
       {"/v1/calendars/:calendar_id/view", handler_calendar_view, []},
       {"/v1/calendars/:calendar_id/events", handler_events, []},
       {"/v1/events/:id", handler_event_by_id, []},
diff --git a/src/handlers/handler_calendar_share_invites.erl b/src/handlers/handler_calendar_share_invites.erl
new file mode 100644
index 0000000..cdd4d3d
--- /dev/null
+++ b/src/handlers/handler_calendar_share_invites.erl
@@ -0,0 +1,134 @@
+%%%-------------------------------------------------------------------
+%%% @doc Owner/admin: исходящие share invites.
+%%%
+%%% GET/POST /v1/calendars/:id/share-invites
+%%% DELETE   /v1/calendars/:id/share-invites/:invite_id
+%%% @end
+%%%-------------------------------------------------------------------
+-module(handler_calendar_share_invites).
+-behaviour(cowboy_handler).
+
+-export([init/2, trails/0]).
+
+-include("records.hrl").
+
+init(Req, Opts) ->
+  handle(Req, Opts).
+
+trails() ->
+  IdParam = #{name => <<"id">>, in => <<"path">>, required => true,
+    schema => #{type => string}},
+  InviteParam = #{name => <<"invite_id">>, in => <<"path">>, required => true,
+    schema => #{type => string}},
+  [
+    #{path => <<"/v1/calendars/:id/share-invites">>, method => <<"GET">>,
+      description => <<"List outgoing share invites">>, tags => [<<"Calendars">>],
+      parameters => [IdParam], responses => #{200 => #{description => <<"OK">>}}},
+    #{path => <<"/v1/calendars/:id/share-invites">>, method => <<"POST">>,
+      description => <<"Create share invite">>, tags => [<<"Calendars">>],
+      parameters => [IdParam], responses => #{201 => #{description => <<"Created">>}}},
+    #{path => <<"/v1/calendars/:id/share-invites/:invite_id">>, method => <<"DELETE">>,
+      description => <<"Cancel pending share invite">>, tags => [<<"Calendars">>],
+      parameters => [IdParam, InviteParam], responses => #{200 => #{description => <<"OK">>}}}
+  ].
+
+handle(Req, _Opts) ->
+  Method = cowboy_req:method(Req),
+  InviteId = cowboy_req:binding(invite_id, Req),
+  case {Method, InviteId} of
+    {<<"GET">>, undefined} -> list_invites(Req);
+    {<<"POST">>, undefined} -> create_invite(Req);
+    {<<"DELETE">>, Id} when is_binary(Id) -> cancel_invite(Req);
+    _ -> handler_utils:send_error(Req, 405, <<"Method not allowed">>)
+  end.
+
+list_invites(Req) ->
+  case handler_utils:auth_user(Req) of
+    {ok, ActorId, Req1} ->
+      CalendarId = cowboy_req:binding(id, Req1),
+      case logic_calendar_share_invite:list_outgoing(ActorId, CalendarId) of
+        {ok, List} ->
+          handler_utils:send_json(Req1, 200,
+            [logic_calendar_share_invite:to_json(I) || I <- List]);
+        {error, not_found} ->
+          handler_utils:send_error(Req1, 404, <<"Calendar not found">>);
+        {error, access_denied} ->
+          handler_utils:send_error(Req1, 403, <<"Access denied">>);
+        {error, _} ->
+          handler_utils:send_error(Req1, 500, <<"Internal server error">>)
+      end;
+    {error, Code, Message, Req1} ->
+      handler_utils:send_error(Req1, Code, Message)
+  end.
+
+create_invite(Req) ->
+  case handler_utils:auth_user(Req) of
+    {ok, ActorId, Req1} ->
+      CalendarId = cowboy_req:binding(id, Req1),
+      {ok, Body, Req2} = cowboy_req:read_body(Req1),
+      try jsx:decode(Body, [return_maps]) of
+        Map when is_map(Map) ->
+          case parse_target(Map) of
+            {error, bad_request} ->
+              handler_utils:send_error(Req2, 400, <<"user_id or email required">>);
+            Target ->
+              Opts = #{rights => maps:get(<<"rights">>, Map, <<"write">>)},
+              case logic_calendar_share_invite:create(ActorId, CalendarId, Target, Opts) of
+                {ok, Inv} ->
+                  handler_utils:send_json(Req2, 201,
+                    logic_calendar_share_invite:to_json(Inv));
+                {error, Reason} ->
+                  map_create_error(Req2, Reason)
+              end
+          end;
+        _ ->
+          handler_utils:send_error(Req2, 400, <<"Invalid JSON">>)
+      catch
+        _:_ -> handler_utils:send_error(Req2, 400, <<"Invalid JSON">>)
+      end;
+    {error, Code, Message, Req1} ->
+      handler_utils:send_error(Req1, Code, Message)
+  end.
+
+cancel_invite(Req) ->
+  case handler_utils:auth_user(Req) of
+    {ok, ActorId, Req1} ->
+      CalendarId = cowboy_req:binding(id, Req1),
+      InviteId = cowboy_req:binding(invite_id, Req1),
+      case logic_calendar_share_invite:cancel(ActorId, CalendarId, InviteId) of
+        {ok, Inv} ->
+          handler_utils:send_json(Req1, 200, logic_calendar_share_invite:to_json(Inv));
+        {error, not_found} ->
+          handler_utils:send_error(Req1, 404, <<"Not found">>);
+        {error, access_denied} ->
+          handler_utils:send_error(Req1, 403, <<"Access denied">>);
+        {error, not_pending} ->
+          handler_utils:send_error(Req1, 409, <<"Invite is not pending">>);
+        {error, _} ->
+          handler_utils:send_error(Req1, 500, <<"Internal server error">>)
+      end;
+    {error, Code, Message, Req1} ->
+      handler_utils:send_error(Req1, Code, Message)
+  end.
+
+parse_target(#{<<"user_id">> := UserId}) when is_binary(UserId), UserId =/= <<>> ->
+  #{user_id => UserId};
+parse_target(#{<<"email">> := Email}) when is_binary(Email), Email =/= <<>> ->
+  #{email => Email};
+parse_target(_) ->
+  {error, bad_request}.
+
+map_create_error(Req, not_found) ->
+  handler_utils:send_error(Req, 404, <<"Calendar not found">>);
+map_create_error(Req, access_denied) ->
+  handler_utils:send_error(Req, 403, <<"Access denied">>);
+map_create_error(Req, user_not_found) ->
+  handler_utils:send_error(Req, 404, <<"User not found">>);
+map_create_error(Req, already_shared) ->
+  handler_utils:send_error(Req, 409, <<"Already shared">>);
+map_create_error(Req, already_pending) ->
+  handler_utils:send_error(Req, 409, <<"Invite already pending">>);
+map_create_error(Req, bad_request) ->
+  handler_utils:send_error(Req, 400, <<"Bad request">>);
+map_create_error(Req, _) ->
+  handler_utils:send_error(Req, 500, <<"Internal server error">>).
diff --git a/src/handlers/handler_calendar_shares.erl b/src/handlers/handler_calendar_shares.erl
new file mode 100644
index 0000000..dcaecc3
--- /dev/null
+++ b/src/handlers/handler_calendar_shares.erl
@@ -0,0 +1,161 @@
+%%%-------------------------------------------------------------------
+%%% @doc Accepted shares on a calendar + revoke / rights / self-mirror.
+%%%
+%%% GET/DELETE/PUT /v1/calendars/:id/shares[/:user_id]
+%%% PUT /v1/user/shares/:calendar_id  body: {mirror_to_default}
+%%% @end
+%%%-------------------------------------------------------------------
+-module(handler_calendar_shares).
+-behaviour(cowboy_handler).
+
+-export([init/2, trails/0]).
+
+-include("records.hrl").
+
+init(Req, Opts) ->
+  handle(Req, Opts).
+
+trails() ->
+  IdParam = #{name => <<"id">>, in => <<"path">>, required => true,
+    schema => #{type => string}},
+  UserParam = #{name => <<"user_id">>, in => <<"path">>, required => true,
+    schema => #{type => string}},
+  CalParam = #{name => <<"calendar_id">>, in => <<"path">>, required => true,
+    schema => #{type => string}},
+  [
+    #{path => <<"/v1/calendars/:id/shares">>, method => <<"GET">>,
+      description => <<"List calendar shares">>, tags => [<<"Calendars">>],
+      parameters => [IdParam], responses => #{200 => #{description => <<"OK">>}}},
+    #{path => <<"/v1/calendars/:id/shares/:user_id">>, method => <<"DELETE">>,
+      description => <<"Revoke share grant">>, tags => [<<"Calendars">>],
+      parameters => [IdParam, UserParam], responses => #{200 => #{description => <<"OK">>}}},
+    #{path => <<"/v1/calendars/:id/shares/:user_id">>, method => <<"PUT">>,
+      description => <<"Update share rights">>, tags => [<<"Calendars">>],
+      parameters => [IdParam, UserParam], responses => #{200 => #{description => <<"OK">>}}},
+    #{path => <<"/v1/user/shares/:calendar_id">>, method => <<"PUT">>,
+      description => <<"Update own mirror_to_default">>, tags => [<<"Users">>],
+      parameters => [CalParam], responses => #{200 => #{description => <<"OK">>}}}
+  ].
+
+handle(Req, _Opts) ->
+  Method = cowboy_req:method(Req),
+  Path = cowboy_req:path(Req),
+  case Path of
+    <<"/v1/user/shares/", _/binary>> ->
+      case Method of
+        <<"PUT">> -> update_my_mirror(Req);
+        _ -> handler_utils:send_error(Req, 405, <<"Method not allowed">>)
+      end;
+    _ ->
+      UserId = cowboy_req:binding(user_id, Req),
+      case {Method, UserId} of
+        {<<"GET">>, undefined} -> list_shares(Req);
+        {<<"DELETE">>, Id} when is_binary(Id) -> revoke_share(Req);
+        {<<"PUT">>, Id} when is_binary(Id) -> update_rights(Req);
+        _ -> handler_utils:send_error(Req, 405, <<"Method not allowed">>)
+      end
+  end.
+
+list_shares(Req) ->
+  case handler_utils:auth_user(Req) of
+    {ok, ActorId, Req1} ->
+      CalendarId = cowboy_req:binding(id, Req1),
+      case logic_calendar_share:list(ActorId, CalendarId) of
+        {ok, List} ->
+          handler_utils:send_json(Req1, 200,
+            [logic_calendar_share:to_json(S) || S <- List]);
+        {error, not_found} ->
+          handler_utils:send_error(Req1, 404, <<"Calendar not found">>);
+        {error, access_denied} ->
+          handler_utils:send_error(Req1, 403, <<"Access denied">>);
+        {error, _} ->
+          handler_utils:send_error(Req1, 500, <<"Internal server error">>)
+      end;
+    {error, Code, Message, Req1} ->
+      handler_utils:send_error(Req1, Code, Message)
+  end.
+
+revoke_share(Req) ->
+  case handler_utils:auth_user(Req) of
+    {ok, ActorId, Req1} ->
+      CalendarId = cowboy_req:binding(id, Req1),
+      TargetUserId = cowboy_req:binding(user_id, Req1),
+      case logic_calendar_share:revoke(ActorId, CalendarId, TargetUserId) of
+        ok ->
+          handler_utils:send_json(Req1, 200, #{ok => true});
+        {error, not_found} ->
+          handler_utils:send_error(Req1, 404, <<"Not found">>);
+        {error, access_denied} ->
+          handler_utils:send_error(Req1, 403, <<"Access denied">>);
+        {error, _} ->
+          handler_utils:send_error(Req1, 500, <<"Internal server error">>)
+      end;
+    {error, Code, Message, Req1} ->
+      handler_utils:send_error(Req1, Code, Message)
+  end.
+
+update_rights(Req) ->
+  case handler_utils:auth_user(Req) of
+    {ok, ActorId, Req1} ->
+      CalendarId = cowboy_req:binding(id, Req1),
+      TargetUserId = cowboy_req:binding(user_id, Req1),
+      {ok, Body, Req2} = cowboy_req:read_body(Req1),
+      try jsx:decode(Body, [return_maps]) of
+        #{<<"rights">> := RightsBin} when is_binary(RightsBin) ->
+          case binary_to_existing_atom_safe(RightsBin) of
+            invalid ->
+              handler_utils:send_error(Req2, 400, <<"Bad request">>);
+            Rights ->
+              case logic_calendar_share:update_rights(ActorId, CalendarId, TargetUserId, Rights) of
+                {ok, Share} ->
+                  handler_utils:send_json(Req2, 200, logic_calendar_share:to_json(Share));
+                {error, Reason} ->
+                  map_share_error(Req2, Reason)
+              end
+          end;
+        _ ->
+          handler_utils:send_error(Req2, 400, <<"rights required">>)
+      catch
+        _:_ -> handler_utils:send_error(Req2, 400, <<"Invalid JSON">>)
+      end;
+    {error, Code, Message, Req1} ->
+      handler_utils:send_error(Req1, Code, Message)
+  end.
+
+update_my_mirror(Req) ->
+  case handler_utils:auth_user(Req) of
+    {ok, UserId, Req1} ->
+      CalendarId = cowboy_req:binding(calendar_id, Req1),
+      {ok, Body, Req2} = cowboy_req:read_body(Req1),
+      try jsx:decode(Body, [return_maps]) of
+        #{<<"mirror_to_default">> := Mirror} when is_boolean(Mirror) ->
+          case logic_calendar_share:update_my_mirror(UserId, CalendarId, Mirror) of
+            {ok, Share} ->
+              handler_utils:send_json(Req2, 200, logic_calendar_share:to_json(Share));
+            {error, Reason} ->
+              map_share_error(Req2, Reason)
+          end;
+        _ ->
+          handler_utils:send_error(Req2, 400, <<"mirror_to_default required">>)
+      catch
+        _:_ -> handler_utils:send_error(Req2, 400, <<"Invalid JSON">>)
+      end;
+    {error, Code, Message, Req1} ->
+      handler_utils:send_error(Req1, Code, Message)
+  end.
+
+binary_to_existing_atom_safe(<<"read">>) -> read;
+binary_to_existing_atom_safe(<<"write">>) -> write;
+binary_to_existing_atom_safe(<<"admin">>) -> admin;
+binary_to_existing_atom_safe(_) -> invalid.
+
+map_share_error(Req, not_found) ->
+  handler_utils:send_error(Req, 404, <<"Not found">>);
+map_share_error(Req, access_denied) ->
+  handler_utils:send_error(Req, 403, <<"Access denied">>);
+map_share_error(Req, bad_request) ->
+  handler_utils:send_error(Req, 400, <<"Bad request">>);
+map_share_error(Req, invalid) ->
+  handler_utils:send_error(Req, 400, <<"Bad request">>);
+map_share_error(Req, _) ->
+  handler_utils:send_error(Req, 500, <<"Internal server error">>).
diff --git a/src/handlers/handler_calendars.erl b/src/handlers/handler_calendars.erl
index a06e3ec..e346297 100644
--- a/src/handlers/handler_calendars.erl
+++ b/src/handlers/handler_calendars.erl
@@ -168,7 +168,7 @@ list_calendars(Req) ->
     {ok, UserId, Req1} ->
       case logic_calendar:list_calendars(UserId) of
         {ok, Calendars} ->
-          Response = [calendar_to_json(C) || C <- Calendars],
+          Response = [calendar_list_json(UserId, C) || C <- Calendars],
           handler_utils:send_json(Req1, 200, Response);
         {error, _} ->
           handler_utils:send_error(Req1, 500, <<"Internal server error">>)
@@ -181,6 +181,21 @@ list_calendars(Req) ->
 %%% Внутренние функции
 %%%===================================================================
 
+-spec calendar_list_json(binary(), #calendar{}) -> map().
+calendar_list_json(UserId, #calendar{owner_id = UserId} = Calendar) ->
+  (calendar_to_json(Calendar))#{role => <<"owner">>};
+calendar_list_json(UserId, Calendar) ->
+  Base = (calendar_to_json(Calendar))#{role => <<"shared">>},
+  case core_calendar_share:get(Calendar#calendar.id, UserId) of
+    {ok, Share} ->
+      Base#{
+        share_rights => Share#calendar_share.rights,
+        mirror_to_default => Share#calendar_share.mirror_to_default
+      };
+    {error, not_found} ->
+      Base
+  end.
+
 -spec calendar_to_json(#calendar{}) -> map().
 calendar_to_json(Calendar) ->
   Base = handler_utils:calendar_to_json(Calendar),
diff --git a/src/handlers/handler_share_invites.erl b/src/handlers/handler_share_invites.erl
new file mode 100644
index 0000000..c49c8d6
--- /dev/null
+++ b/src/handlers/handler_share_invites.erl
@@ -0,0 +1,152 @@
+%%%-------------------------------------------------------------------
+%%% @doc Invitee: входящие share invites + accept/decline.
+%%%
+%%% GET  /v1/user/share-invites
+%%% POST /v1/share-invites/:id/accept | decline
+%%% POST /v1/share-invites/accept  body: {token, mirror_to_default?}
+%%% @end
+%%%-------------------------------------------------------------------
+-module(handler_share_invites).
+-behaviour(cowboy_handler).
+
+-export([init/2, trails/0]).
+
+-include("records.hrl").
+
+init(Req, Opts) ->
+  handle(Req, Opts).
+
+trails() ->
+  IdParam = #{name => <<"id">>, in => <<"path">>, required => true,
+    schema => #{type => string}},
+  [
+    #{path => <<"/v1/user/share-invites">>, method => <<"GET">>,
+      description => <<"Incoming share invites">>, tags => [<<"Users">>],
+      responses => #{200 => #{description => <<"OK">>}}},
+    #{path => <<"/v1/share-invites/accept">>, method => <<"POST">>,
+      description => <<"Accept share invite by token">>, tags => [<<"Users">>],
+      responses => #{200 => #{description => <<"OK">>}}},
+    #{path => <<"/v1/share-invites/:id/accept">>, method => <<"POST">>,
+      description => <<"Accept share invite">>, tags => [<<"Users">>],
+      parameters => [IdParam], responses => #{200 => #{description => <<"OK">>}}},
+    #{path => <<"/v1/share-invites/:id/decline">>, method => <<"POST">>,
+      description => <<"Decline share invite">>, tags => [<<"Users">>],
+      parameters => [IdParam], responses => #{200 => #{description => <<"OK">>}}}
+  ].
+
+handle(Req, _Opts) ->
+  Method = cowboy_req:method(Req),
+  Path = cowboy_req:path(Req),
+  case Method of
+    <<"GET">> ->
+      list_incoming(Req);
+    <<"POST">> ->
+      case Path of
+        <<"/v1/share-invites/accept">> ->
+          accept_token(Req);
+        _ ->
+          case {cowboy_req:binding(id, Req), path_action(Path)} of
+            {Id, accept} when is_binary(Id) -> accept_id(Req, Id);
+            {Id, decline} when is_binary(Id) -> decline_id(Req, Id);
+            _ -> handler_utils:send_error(Req, 404, <<"Not found">>)
+          end
+      end;
+    _ ->
+      handler_utils:send_error(Req, 405, <<"Method not allowed">>)
+  end.
+
+path_action(Path) ->
+  case binary:match(Path, <<"/accept">>) of
+    nomatch ->
+      case binary:match(Path, <<"/decline">>) of
+        nomatch -> unknown;
+        _ -> decline
+      end;
+    _ -> accept
+  end.
+
+list_incoming(Req) ->
+  case handler_utils:auth_user(Req) of
+    {ok, UserId, Req1} ->
+      {ok, List} = logic_calendar_share_invite:list_incoming(UserId),
+      handler_utils:send_json(Req1, 200,
+        [logic_calendar_share_invite:to_json(I) || I <- List]);
+    {error, Code, Message, Req1} ->
+      handler_utils:send_error(Req1, Code, Message)
+  end.
+
+accept_id(Req, InviteId) ->
+  case handler_utils:auth_user(Req) of
+    {ok, UserId, Req1} ->
+      {ok, Body, Req2} = cowboy_req:read_body(Req1),
+      Opts = parse_accept_opts(Body),
+      reply_accept(Req2, logic_calendar_share_invite:accept(UserId, InviteId, Opts));
+    {error, Code, Message, Req1} ->
+      handler_utils:send_error(Req1, Code, Message)
+  end.
+
+decline_id(Req, InviteId) ->
+  case handler_utils:auth_user(Req) of
+    {ok, UserId, Req1} ->
+      case logic_calendar_share_invite:decline(UserId, InviteId) of
+        {ok, Inv} ->
+          handler_utils:send_json(Req1, 200, logic_calendar_share_invite:to_json(Inv));
+        {error, Reason} ->
+          map_decide_error(Req1, Reason)
+      end;
+    {error, Code, Message, Req1} ->
+      handler_utils:send_error(Req1, Code, Message)
+  end.
+
+accept_token(Req) ->
+  case handler_utils:auth_user(Req) of
+    {ok, UserId, Req1} ->
+      {ok, Body, Req2} = cowboy_req:read_body(Req1),
+      try jsx:decode(Body, [return_maps]) of
+        #{<<"token">> := Token} = Map when is_binary(Token), Token =/= <<>> ->
+          Opts = accept_opts_from_map(Map),
+          reply_accept(Req2,
+            logic_calendar_share_invite:accept_by_token(UserId, Token, Opts));
+        _ ->
+          handler_utils:send_error(Req2, 400, <<"token required">>)
+      catch
+        _:_ -> handler_utils:send_error(Req2, 400, <<"Invalid JSON">>)
+      end;
+    {error, Code, Message, Req1} ->
+      handler_utils:send_error(Req1, Code, Message)
+  end.
+
+parse_accept_opts(<<>>) -> #{};
+parse_accept_opts(Body) ->
+  try jsx:decode(Body, [return_maps]) of
+    Map when is_map(Map) -> accept_opts_from_map(Map);
+    _ -> #{}
+  catch
+    _:_ -> #{}
+  end.
+
+accept_opts_from_map(Map) ->
+  case maps:get(<<"mirror_to_default">>, Map, undefined) of
+    true -> #{mirror_to_default => true};
+    false -> #{mirror_to_default => false};
+    _ -> #{}
+  end.
+
+reply_accept(Req, {ok, Inv, Share}) ->
+  handler_utils:send_json(Req, 200, #{
+    invite => logic_calendar_share_invite:to_json(Inv),
+    share => logic_calendar_share:to_json(Share)
+  });
+reply_accept(Req, {error, Reason}) ->
+  map_decide_error(Req, Reason).
+
+map_decide_error(Req, not_found) ->
+  handler_utils:send_error(Req, 404, <<"Not found">>);
+map_decide_error(Req, access_denied) ->
+  handler_utils:send_error(Req, 403, <<"Access denied">>);
+map_decide_error(Req, not_pending) ->
+  handler_utils:send_error(Req, 409, <<"Invite is not pending">>);
+map_decide_error(Req, expired) ->
+  handler_utils:send_error(Req, 410, <<"Invite expired">>);
+map_decide_error(Req, _) ->
+  handler_utils:send_error(Req, 500, <<"Internal server error">>).
diff --git a/src/infra/infra_mnesia.erl b/src/infra/infra_mnesia.erl
index 43d7c58..2458018 100755
--- a/src/infra/infra_mnesia.erl
+++ b/src/infra/infra_mnesia.erl
@@ -14,7 +14,8 @@
 
 -define(TABLES, [
   user, session, verification, password_reset, admin, admin_session, auth_session,
-  calendar, calendar_share, calendar_follow, calendar_specialist, specialist_invite,
+  calendar, calendar_share, calendar_share_invite, calendar_follow, calendar_specialist,
+  specialist_invite,
   event, recurrence_exception,
   booking, waitlist_entry,
   review, review_vote, report, banned_word, automod_settings, automod_hit,
@@ -317,7 +318,12 @@ create_table(Table) ->
 table_opts(user) -> [{disc_copies, [node()]}, {attributes, record_info(fields, user)}];
 table_opts(admin) -> [{disc_copies, [node()]}, {attributes, record_info(fields, admin)}];
 table_opts(calendar) -> [{disc_copies, [node()]}, {attributes, record_info(fields, calendar)}];
-table_opts(calendar_share) -> [{disc_copies, [node()]}, {attributes, record_info(fields, calendar_share)}];
+table_opts(calendar_share) ->
+  [{disc_copies, [node()]}, {attributes, record_info(fields, calendar_share)},
+   {index, [calendar_id, user_id]}];
+table_opts(calendar_share_invite) ->
+  [{disc_copies, [node()]}, {attributes, record_info(fields, calendar_share_invite)},
+   {index, [calendar_id, invitee_user_id, invitee_email, token, status]}];
 table_opts(calendar_follow) -> [{disc_copies, [node()]}, {attributes, record_info(fields, calendar_follow)}];
 table_opts(calendar_specialist) -> [{disc_copies, [node()]}, {attributes, record_info(fields, calendar_specialist)}];
 table_opts(specialist_invite) -> [{disc_copies, [node()]}, {attributes, record_info(fields, specialist_invite)}];
diff --git a/src/logic/logic_calendar.erl b/src/logic/logic_calendar.erl
index 3cd463e..7239aba 100755
--- a/src/logic/logic_calendar.erl
+++ b/src/logic/logic_calendar.erl
@@ -172,9 +172,21 @@ get_calendar(UserId, CalendarId) ->
       Error
   end.
 
-%% Список календарей пользователя
+%% Список календарей пользователя: owned ∪ shared grants
 list_calendars(UserId) ->
-  core_calendar:list_by_owner(UserId).
+  {ok, Owned} = core_calendar:list_by_owner(UserId),
+  Shared = shared_calendars(UserId),
+  OwnedIds = [C#calendar.id || C <- Owned],
+  SharedOnly = [C || C <- Shared, not lists:member(C#calendar.id, OwnedIds)],
+  {ok, Owned ++ SharedOnly}.
+
+shared_calendars(UserId) ->
+  lists:filtermap(fun(#calendar_share{calendar_id = CalId}) ->
+    case core_calendar:get_by_id(CalId) of
+      {ok, #calendar{status = active} = Cal} -> {true, Cal};
+      _ -> false
+    end
+  end, core_calendar_share:list_by_user(UserId)).
 
 %% Обновление календаря
 update_calendar(UserId, CalendarId, Updates) ->
@@ -227,16 +239,16 @@ apply_calendar_update(CalendarId, Calendar, ValidUpdates) ->
       end
   end.
 
-%% Единственный personal нельзя превратить в commercial (дневник пользователя).
-gate_type_change(_UserId, #calendar{type = personal}, Updates) ->
+%% Смена type — только owner. Единственный personal → commercial запрещён.
+gate_type_change(UserId, #calendar{owner_id = OwnerId} = Calendar, Updates) ->
   case lists:keyfind(type, 1, Updates) of
-    {type, commercial} ->
+    {type, _} when UserId =/= OwnerId ->
+      {error, access_denied};
+    {type, commercial} when Calendar#calendar.type =:= personal ->
       {error, default_calendar};
     _ ->
       {ok, Updates}
-  end;
-gate_type_change(_UserId, _Calendar, Updates) ->
-  {ok, Updates}.
+  end.
 
 maybe_cancel_pending_on_personal(#calendar{type = commercial},
                                  #calendar{type = personal, id = Id}) ->
@@ -270,18 +282,15 @@ apply_text_results(Updates, [], []) -> Updates;
 apply_text_results(Updates, [F | Fs], [T | Ts]) ->
   apply_text_results(lists:keystore(F, 1, Updates, {F, T}), Fs, Ts).
 
-%% Удаление календаря (единственный personal удалять нельзя)
+%% Удаление календаря: только owner (share write/admin не удаляет)
 delete_calendar(UserId, CalendarId) ->
   case core_calendar:get_by_id(CalendarId) of
     {ok, #calendar{type = personal}} ->
       {error, default_calendar};
-    {ok, Calendar} ->
-      case can_edit(UserId, Calendar) of
-        true ->
-          core_calendar:delete(CalendarId);
-        false ->
-          {error, access_denied}
-      end;
+    {ok, #calendar{owner_id = UserId, status = active}} ->
+      core_calendar:delete(CalendarId);
+    {ok, #calendar{}} ->
+      {error, access_denied};
     Error ->
       Error
   end.
@@ -289,16 +298,22 @@ delete_calendar(UserId, CalendarId) ->
 %% Проверка прав доступа (просмотр)
 can_access(UserId, #calendar{owner_id = UserId, status = active}) ->
   true;
+can_access(UserId, #calendar{id = CalId, type = personal, status = active}) ->
+  logic_calendar_share:get_rights(UserId, CalId) =/= none;
 can_access(_UserId, #calendar{type = commercial, status = active}) ->
   true;
 can_access(_UserId, _) ->
   false.
 
-%% Проверка прав редактирования
+%% Проверка прав редактирования (owner или share write|admin)
 can_edit(UserId, #calendar{owner_id = UserId, status = active}) ->
   true;
-can_edit(_UserId, #calendar{owner_id = _OwnerId}) ->
-  false;
+can_edit(UserId, #calendar{id = CalId, status = active}) ->
+  case logic_calendar_share:get_rights(UserId, CalId) of
+    write -> true;
+    admin -> true;
+    _ -> false
+  end;
 can_edit(_, _) ->
   false.
 
diff --git a/src/logic/logic_calendar_share.erl b/src/logic/logic_calendar_share.erl
new file mode 100644
index 0000000..01d88f2
--- /dev/null
+++ b/src/logic/logic_calendar_share.erl
@@ -0,0 +1,119 @@
+%%%-------------------------------------------------------------------
+%%% @doc Grants calendar_share: list / revoke / rights / mirror.
+%%% @end
+%%%-------------------------------------------------------------------
+-module(logic_calendar_share).
+-include("records.hrl").
+
+-export([
+  list/2,
+  revoke/3,
+  update_rights/4,
+  update_my_mirror/3,
+  get_rights/2,
+  can_manage_shares/2,
+  to_json/1
+]).
+
+-spec list(ActorId :: binary(), CalendarId :: binary()) ->
+  {ok, [#calendar_share{}]} | {error, not_found | access_denied}.
+list(ActorId, CalendarId) ->
+  case require_can_view_shares(ActorId, CalendarId) of
+    {ok, _} -> {ok, core_calendar_share:list_by_calendar(CalendarId)};
+    Error -> Error
+  end.
+
+-spec revoke(ActorId :: binary(), CalendarId :: binary(), TargetUserId :: binary()) ->
+  ok | {error, not_found | access_denied | term()}.
+revoke(ActorId, CalendarId, TargetUserId) ->
+  case require_can_manage(ActorId, CalendarId) of
+    {ok, _} ->
+      case core_calendar_share:delete(CalendarId, TargetUserId) of
+        ok -> ok;
+        {error, _} = E -> E
+      end;
+    Error -> Error
+  end.
+
+-spec update_rights(ActorId :: binary(), CalendarId :: binary(),
+    TargetUserId :: binary(), Rights :: read | write | admin) ->
+  {ok, #calendar_share{}} | {error, not_found | access_denied | bad_request | term()}.
+update_rights(ActorId, CalendarId, TargetUserId, Rights) ->
+  case valid_rights(Rights) of
+    false -> {error, bad_request};
+    true ->
+      case require_can_manage(ActorId, CalendarId) of
+        {ok, _} -> core_calendar_share:update_rights(CalendarId, TargetUserId, Rights);
+        Error -> Error
+      end
+  end.
+
+%% Invitee updates own mirror preference (personal shares only meaningful).
+-spec update_my_mirror(UserId :: binary(), CalendarId :: binary(), Mirror :: boolean()) ->
+  {ok, #calendar_share{}} | {error, not_found | access_denied | term()}.
+update_my_mirror(UserId, CalendarId, Mirror) when is_boolean(Mirror) ->
+  case core_calendar_share:get(CalendarId, UserId) of
+    {ok, _} -> core_calendar_share:update_mirror(CalendarId, UserId, Mirror);
+    {error, not_found} -> {error, not_found}
+  end;
+update_my_mirror(_, _, _) ->
+  {error, bad_request}.
+
+-spec get_rights(UserId :: binary(), CalendarId :: binary()) ->
+  none | read | write | admin.
+get_rights(UserId, CalendarId) ->
+  case core_calendar_share:get(CalendarId, UserId) of
+    {ok, #calendar_share{rights = R}} -> R;
+    {error, not_found} -> none
+  end.
+
+-spec can_manage_shares(UserId :: binary(), #calendar{}) -> boolean().
+can_manage_shares(UserId, #calendar{owner_id = UserId, status = active}) ->
+  true;
+can_manage_shares(UserId, #calendar{id = CalId, status = active}) ->
+  get_rights(UserId, CalId) =:= admin;
+can_manage_shares(_, _) ->
+  false.
+
+-spec to_json(#calendar_share{}) -> map().
+to_json(S) ->
+  #{
+    id => S#calendar_share.id,
+    calendar_id => S#calendar_share.calendar_id,
+    user_id => S#calendar_share.user_id,
+    rights => S#calendar_share.rights,
+    mirror_to_default => S#calendar_share.mirror_to_default
+  }.
+
+%%%===================================================================
+%%% Internal
+%%%===================================================================
+
+require_can_view_shares(ActorId, CalendarId) ->
+  case core_calendar:get_by_id(CalendarId) of
+    {ok, #calendar{status = active} = Cal} ->
+      case can_manage_shares(ActorId, Cal)
+            orelse Cal#calendar.owner_id =:= ActorId
+            orelse get_rights(ActorId, CalendarId) =/= none of
+        true -> {ok, Cal};
+        false -> {error, access_denied}
+      end;
+    {ok, _} -> {error, not_found};
+    Error -> Error
+  end.
+
+require_can_manage(ActorId, CalendarId) ->
+  case core_calendar:get_by_id(CalendarId) of
+    {ok, #calendar{status = active} = Cal} ->
+      case can_manage_shares(ActorId, Cal) of
+        true -> {ok, Cal};
+        false -> {error, access_denied}
+      end;
+    {ok, _} -> {error, not_found};
+    Error -> Error
+  end.
+
+valid_rights(read) -> true;
+valid_rights(write) -> true;
+valid_rights(admin) -> true;
+valid_rights(_) -> false.
diff --git a/src/logic/logic_calendar_share_invite.erl b/src/logic/logic_calendar_share_invite.erl
new file mode 100644
index 0000000..c86c553
--- /dev/null
+++ b/src/logic/logic_calendar_share_invite.erl
@@ -0,0 +1,313 @@
+%%%-------------------------------------------------------------------
+%%% @doc Приглашения calendar_share (соредактор personal / заместитель commercial).
+%%% @end
+%%%-------------------------------------------------------------------
+-module(logic_calendar_share_invite).
+-include("records.hrl").
+
+-export([
+  create/4,
+  list_outgoing/2,
+  cancel/3,
+  list_incoming/1,
+  accept/3,
+  decline/2,
+  accept_by_token/3,
+  to_json/1
+]).
+
+-define(INVITE_TTL_DAYS, 7).
+
+-spec create(ActorId :: binary(), CalendarId :: binary(), Target :: map(),
+    Opts :: map()) ->
+  {ok, #calendar_share_invite{}} |
+  {error, not_found | access_denied | user_not_found | already_shared |
+   already_pending | bad_request | term()}.
+create(ActorId, CalendarId, Target, Opts) ->
+  case require_can_invite(ActorId, CalendarId) of
+    {ok, _Cal} ->
+      case resolve_target(Target) of
+        {error, _} = E -> E;
+        {ok, UserId, Email} ->
+          case already_shared(CalendarId, UserId) of
+            true ->
+              {error, already_shared};
+            false ->
+              case core_calendar_share_invite:find_pending(CalendarId, UserId, Email) of
+                [_ | _] ->
+                  {error, already_pending};
+                [] ->
+                  do_create(ActorId, CalendarId, UserId, Email, Opts)
+              end
+          end
+      end;
+    Error -> Error
+  end.
+
+-spec list_outgoing(ActorId :: binary(), CalendarId :: binary()) ->
+  {ok, [#calendar_share_invite{}]} | {error, not_found | access_denied}.
+list_outgoing(ActorId, CalendarId) ->
+  case require_can_invite(ActorId, CalendarId) of
+    {ok, _} ->
+      List = [maybe_expire(I) || I <- core_calendar_share_invite:list_by_calendar(CalendarId)],
+      {ok, List};
+    Error -> Error
+  end.
+
+-spec cancel(ActorId :: binary(), CalendarId :: binary(), InviteId :: binary()) ->
+  {ok, #calendar_share_invite{}} |
+  {error, not_found | access_denied | not_pending | term()}.
+cancel(ActorId, CalendarId, InviteId) ->
+  case require_can_invite(ActorId, CalendarId) of
+    {ok, _} ->
+      case core_calendar_share_invite:get_by_id(InviteId) of
+        {ok, #calendar_share_invite{calendar_id = CalendarId, status = pending} = Inv} ->
+          Inv2 = maybe_expire(Inv),
+          case Inv2#calendar_share_invite.status of
+            pending -> core_calendar_share_invite:update_status(InviteId, cancelled);
+            _ -> {error, not_pending}
+          end;
+        {ok, #calendar_share_invite{calendar_id = CalendarId}} ->
+          {error, not_pending};
+        {ok, _} ->
+          {error, not_found};
+        {error, _} = E -> E
+      end;
+    Error -> Error
+  end.
+
+-spec list_incoming(UserId :: binary()) -> {ok, [#calendar_share_invite{}]}.
+list_incoming(UserId) ->
+  case core_user:get_by_id(UserId) of
+    {ok, #user{email = Email}} ->
+      ByUser = core_calendar_share_invite:list_by_invitee(UserId),
+      ByEmail = case Email of
+        <<>> -> [];
+        _ -> core_calendar_share_invite:list_by_email(Email)
+      end,
+      Merged = lists:ukeysort(1, [{I#calendar_share_invite.id, maybe_expire(I)}
+        || I <- ByUser ++ ByEmail]),
+      {ok, [I || {_, I} <- Merged]};
+    {error, _} ->
+      {ok, [maybe_expire(I) || I <- core_calendar_share_invite:list_by_invitee(UserId)]}
+  end.
+
+-spec accept(UserId :: binary(), InviteId :: binary(), Opts :: map()) ->
+  {ok, #calendar_share_invite{}, #calendar_share{}} |
+  {error, not_found | access_denied | not_pending | expired | term()}.
+accept(UserId, InviteId, Opts) ->
+  case core_calendar_share_invite:get_by_id(InviteId) of
+    {ok, Inv0} ->
+      Inv = maybe_expire(Inv0),
+      case Inv#calendar_share_invite.status of
+        pending ->
+          case can_accept(UserId, Inv) of
+            true -> finalize_accept(UserId, Inv, Opts);
+            false -> {error, access_denied}
+          end;
+        expired -> {error, expired};
+        _ -> {error, not_pending}
+      end;
+    {error, _} = E -> E
+  end.
+
+-spec decline(UserId :: binary(), InviteId :: binary()) ->
+  {ok, #calendar_share_invite{}} |
+  {error, not_found | access_denied | not_pending | expired | term()}.
+decline(UserId, InviteId) ->
+  case core_calendar_share_invite:get_by_id(InviteId) of
+    {ok, Inv0} ->
+      Inv = maybe_expire(Inv0),
+      case Inv#calendar_share_invite.status of
+        pending ->
+          case can_accept(UserId, Inv) of
+            true -> core_calendar_share_invite:update_status(InviteId, declined);
+            false -> {error, access_denied}
+          end;
+        expired -> {error, expired};
+        _ -> {error, not_pending}
+      end;
+    {error, _} = E -> E
+  end.
+
+-spec accept_by_token(UserId :: binary(), Token :: binary(), Opts :: map()) ->
+  {ok, #calendar_share_invite{}, #calendar_share{}} |
+  {error, not_found | access_denied | not_pending | expired | term()}.
+accept_by_token(UserId, Token, Opts) ->
+  case core_calendar_share_invite:get_by_token(Token) of
+    {ok, #calendar_share_invite{id = Id}} ->
+      accept(UserId, Id, Opts);
+    {error, _} = E -> E
+  end.
+
+-spec to_json(#calendar_share_invite{}) -> map().
+to_json(I) ->
+  #{
+    id => I#calendar_share_invite.id,
+    calendar_id => I#calendar_share_invite.calendar_id,
+    inviter_id => I#calendar_share_invite.inviter_id,
+    invitee_user_id => null_if_empty(I#calendar_share_invite.invitee_user_id),
+    invitee_email => null_if_empty(I#calendar_share_invite.invitee_email),
+    rights => I#calendar_share_invite.rights,
+    status => I#calendar_share_invite.status,
+    created_at => handler_utils:datetime_to_iso8601(I#calendar_share_invite.created_at),
+    expires_at => handler_utils:datetime_to_iso8601(I#calendar_share_invite.expires_at)
+  }.
+
+%%%===================================================================
+%%% Internal
+%%%===================================================================
+
+do_create(ActorId, CalendarId, UserId, Email, Opts) ->
+  Now = calendar:universal_time(),
+  Expires = add_days(Now, ?INVITE_TTL_DAYS),
+  Rights = normalize_rights(maps:get(rights, Opts, write)),
+  case Rights of
+    bad -> {error, bad_request};
+    R ->
+      Rec = #calendar_share_invite{
+        id = infra_utils:generate_id(16),
+        calendar_id = CalendarId,
+        inviter_id = ActorId,
+        invitee_user_id = UserId,
+        invitee_email = Email,
+        rights = R,
+        status = pending,
+        token = infra_utils:generate_id(32),
+        created_at = Now,
+        expires_at = Expires
+      },
+      case core_calendar_share_invite:create(Rec) of
+        {ok, Created} ->
+          notify_invite(Created),
+          {ok, Created};
+        Error -> Error
+      end
+  end.
+
+notify_invite(#calendar_share_invite{invitee_user_id = UserId, calendar_id = CalId} = Inv)
+  when UserId =/= <<>> ->
+  Title = <<"Приглашение к календарю"/utf8>>,
+  Body = <<"Вас пригласили в календарь "/utf8, CalId/binary>>,
+  _ = core_notification:create(UserId, calendar_share_invite, Title, Body),
+  logic_notification:notify_calendar_share_invite(UserId, Inv),
+  ok;
+notify_invite(_) ->
+  ok.
+
+finalize_accept(UserId, #calendar_share_invite{
+    id = InviteId, calendar_id = CalendarId, rights = Rights,
+    invitee_user_id = PrevUser}, Opts) ->
+  Mirror = resolve_mirror(CalendarId, Opts),
+  case core_calendar_share:upsert(CalendarId, UserId, Rights, Mirror) of
+    {ok, Share} ->
+      case core_calendar_share_invite:update_status(InviteId, accepted) of
+        {ok, Inv2} ->
+          Inv3 = case PrevUser of
+            <<>> ->
+              Filled = Inv2#calendar_share_invite{invitee_user_id = UserId},
+              ok = core_calendar_share_invite:write(Filled),
+              Filled;
+            _ -> Inv2
+          end,
+          {ok, Inv3, Share};
+        Error -> Error
+      end;
+    Error -> Error
+  end.
+
+resolve_mirror(CalendarId, Opts) ->
+  Default = case core_calendar:get_by_id(CalendarId) of
+    {ok, #calendar{type = personal}} -> true;
+    _ -> false
+  end,
+  case maps:get(mirror_to_default, Opts, Default) of
+    true -> true;
+    false -> false;
+    _ -> Default
+  end.
+
+can_accept(UserId, #calendar_share_invite{invitee_user_id = UserId})
+  when UserId =/= <<>> -> true;
+can_accept(UserId, #calendar_share_invite{invitee_user_id = <<>>, invitee_email = Email})
+  when Email =/= <<>> ->
+  case core_user:get_by_id(UserId) of
+    {ok, #user{email = Email}} -> true;
+    _ -> false
+  end;
+can_accept(_, _) -> false.
+
+already_shared(_CalendarId, <<>>) -> false;
+already_shared(CalendarId, UserId) ->
+  case core_calendar_share:get(CalendarId, UserId) of
+    {ok, _} -> true;
+    {error, not_found} -> false
+  end.
+
+resolve_target(#{user_id := UserId}) when is_binary(UserId), UserId =/= <<>> ->
+  case core_user:get_by_id(UserId) of
+    {ok, #user{status = active, email = Email}} ->
+      {ok, UserId, Email};
+    {ok, #user{status = _}} ->
+      {error, user_not_found};
+    {error, _} ->
+      {error, user_not_found}
+  end;
+resolve_target(#{email := Email0}) when is_binary(Email0), Email0 =/= <<>> ->
+  Email = string:trim(Email0),
+  case find_user_by_email(Email) of
+    {ok, #user{id = UserId, status = active}} ->
+      {ok, UserId, Email};
+    {ok, #user{status = _}} ->
+      {ok, <<>>, Email};
+    {error, not_found} ->
+      {ok, <<>>, Email}
+  end;
+resolve_target(_) ->
+  {error, bad_request}.
+
+find_user_by_email(Email) ->
+  case core_user:get_by_email(Email) of
+    {ok, _} = Ok -> Ok;
+    {error, not_found} ->
+      Lower = string:lowercase(Email),
+      case Lower =:= Email of
+        true -> {error, not_found};
+        false -> core_user:get_by_email(Lower)
+      end
+  end.
+
+require_can_invite(ActorId, CalendarId) ->
+  case core_calendar:get_by_id(CalendarId) of
+    {ok, #calendar{status = active} = Cal} ->
+      case logic_calendar_share:can_manage_shares(ActorId, Cal) of
+        true -> {ok, Cal};
+        false -> {error, access_denied}
+      end;
+    {ok, _} -> {error, not_found};
+    Error -> Error
+  end.
+
+normalize_rights(read) -> read;
+normalize_rights(write) -> write;
+normalize_rights(admin) -> admin;
+normalize_rights(<<"read">>) -> read;
+normalize_rights(<<"write">>) -> write;
+normalize_rights(<<"admin">>) -> admin;
+normalize_rights(_) -> bad.
+
+maybe_expire(#calendar_share_invite{status = pending, expires_at = Exp, id = Id} = Inv) ->
+  case Exp < calendar:universal_time() of
+    true ->
+      _ = core_calendar_share_invite:update_status(Id, expired),
+      Inv#calendar_share_invite{status = expired};
+    false -> Inv
+  end;
+maybe_expire(Inv) -> Inv.
+
+add_days(DateTime, Days) ->
+  Sec = calendar:datetime_to_gregorian_seconds(DateTime) + Days * 86400,
+  calendar:gregorian_seconds_to_datetime(Sec).
+
+null_if_empty(<<>>) -> null;
+null_if_empty(V) -> V.
diff --git a/src/logic/logic_notification.erl b/src/logic/logic_notification.erl
index 0200683..ecda88e 100755
--- a/src/logic/logic_notification.erl
+++ b/src/logic/logic_notification.erl
@@ -5,7 +5,7 @@
 -export([notify_calendar_update/1]).
 -export([notify_event_update/1]).
 -export([notify_admin/2]).
--export([notify_specialist_invite/2]).
+-export([notify_specialist_invite/2, notify_calendar_share_invite/2]).
 -export([notify_event_reminder/2]).
 -export([notify_waitlist_promoted/2]).
 
@@ -47,6 +47,16 @@ notify_specialist_invite(UserId, Invite) ->
   },
   broadcast_to_user(UserId, specialist_invite, Data).
 
+%% In-app / WS: приглашение calendar_share
+notify_calendar_share_invite(UserId, Invite) ->
+  Data = #{
+    invite_id => Invite#calendar_share_invite.id,
+    calendar_id => Invite#calendar_share_invite.calendar_id,
+    rights => Invite#calendar_share_invite.rights,
+    status => Invite#calendar_share_invite.status
+  },
+  broadcast_to_user(UserId, calendar_share_invite, Data).
+
 %% In-app / WS: напоминание о записи (Back#70)
 notify_event_reminder(UserId, #{title := Title, when_text := WhenText} = Data) ->
   NTitle = <<"Напоминание о записи"/utf8>>,
diff --git a/src/logic/logic_search.erl b/src/logic/logic_search.erl
index f46a20d..12cc7f1 100755
--- a/src/logic/logic_search.erl
+++ b/src/logic/logic_search.erl
@@ -191,10 +191,13 @@ filter_accessible_calendars(Calendars, UserId) ->
   end, Calendars).
 
 %% Restricted commercial не показываем в search/discovery (deep-link остаётся).
+%% Personal всегда приватны — только list/deep-link для owner|share.
 calendar_discoverable(#calendar{type = commercial} = C) ->
   logic_calendar:booking_open(C);
+calendar_discoverable(#calendar{type = personal}) ->
+  false;
 calendar_discoverable(_) ->
-  true.
+  false.
 
 %% @doc Builds a #{calendar_id => #calendar{}} map using dirty_read
 %% (key-based lookups).  Used to batch-fetch calendars and avoid N+1
diff --git a/src/migrations/20260815220000_calendar_share_invite.erl b/src/migrations/20260815220000_calendar_share_invite.erl
new file mode 100644
index 0000000..7f0a00d
--- /dev/null
+++ b/src/migrations/20260815220000_calendar_share_invite.erl
@@ -0,0 +1,88 @@
+%% @doc calendar_share: id PK + mirror_to_default; create calendar_share_invite.
+-module('20260815220000_calendar_share_invite').
+
+-export([up/0, down/0]).
+
+-include("records.hrl").
+
+up() ->
+  transform_calendar_share(),
+  ensure_index(calendar_share, calendar_id),
+  ensure_index(calendar_share, user_id),
+  ensure_table(calendar_share_invite, record_info(fields, calendar_share_invite)),
+  ensure_index(calendar_share_invite, calendar_id),
+  ensure_index(calendar_share_invite, invitee_user_id),
+  ensure_index(calendar_share_invite, invitee_email),
+  ensure_index(calendar_share_invite, token),
+  ensure_index(calendar_share_invite, status),
+  ok.
+
+down() ->
+  _ = mnesia:delete_table(calendar_share_invite),
+  ok.
+
+transform_calendar_share() ->
+  case lists:member(calendar_share, mnesia:system_info(tables)) of
+    false ->
+      ensure_table(calendar_share, record_info(fields, calendar_share));
+    true ->
+      Attrs = mnesia:table_info(calendar_share, attributes),
+      case Attrs =:= record_info(fields, calendar_share) of
+        true ->
+          ok;
+        false ->
+          Fun = fun(Rec) ->
+            case tuple_to_list(Rec) of
+              [calendar_share, CalId, UserId, Rights] ->
+                #calendar_share{
+                  id = infra_utils:generate_id(16),
+                  calendar_id = CalId,
+                  user_id = UserId,
+                  rights = Rights,
+                  mirror_to_default = false
+                };
+              [calendar_share, Id, CalId, UserId, Rights] ->
+                #calendar_share{
+                  id = Id,
+                  calendar_id = CalId,
+                  user_id = UserId,
+                  rights = Rights,
+                  mirror_to_default = false
+                };
+              _ ->
+                Rec
+            end
+          end,
+          case mnesia:transform_table(calendar_share, Fun,
+                                      record_info(fields, calendar_share)) of
+            {atomic, ok} -> ok;
+            {aborted, Reason} -> error({transform_calendar_share_failed, Reason})
+          end
+      end
+  end.
+
+ensure_table(Table, Attrs) ->
+  case lists:member(Table, mnesia:system_info(tables)) of
+    true ->
+      ok;
+    false ->
+      case mnesia:create_table(Table, [{disc_copies, [node()]}, {attributes, Attrs}]) of
+        {atomic, ok} -> ok;
+        {aborted, {already_exists, Table}} -> ok;
+        {aborted, Reason} -> error({create_table_failed, Table, Reason})
+      end
+  end.
+
+ensure_index(Table, Attr) ->
+  case lists:member(Table, mnesia:system_info(tables)) of
+    false ->
+      ok;
+    true ->
+      case mnesia:add_table_index(Table, Attr) of
+        {atomic, ok} -> ok;
+        {aborted, {already_exists, Table, _Pos}} -> ok;
+        {aborted, {already_exists, Table, Attr}} -> ok;
+        {aborted, {already_exists, _}} -> ok;
+        {aborted, Reason} -> error({add_index_failed, Table, Attr, Reason})
+      end
+  end.
diff --git a/test/unit/eh_test_support.erl b/test/unit/eh_test_support.erl
index bf8b08f..ea92520 100755
--- a/test/unit/eh_test_support.erl
+++ b/test/unit/eh_test_support.erl
@@ -143,7 +143,11 @@ table_opts(admin) ->
 table_opts(calendar) ->
   [{ram_copies, [node()]}, {attributes, record_info(fields, calendar)}];
 table_opts(calendar_share) ->
-  [{ram_copies, [node()]}, {attributes, record_info(fields, calendar_share)}];
+  [{ram_copies, [node()]}, {attributes, record_info(fields, calendar_share)},
+   {index, [calendar_id, user_id]}];
+table_opts(calendar_share_invite) ->
+  [{ram_copies, [node()]}, {attributes, record_info(fields, calendar_share_invite)},
+   {index, [calendar_id, invitee_user_id, invitee_email, token, status]}];
 table_opts(calendar_follow) ->
   [{ram_copies, [node()]}, {attributes, record_info(fields, calendar_follow)}];
 table_opts(calendar_specialist) ->
diff --git a/test/unit/logic_calendar_share_tests.erl b/test/unit/logic_calendar_share_tests.erl
new file mode 100644
index 0000000..09454a9
--- /dev/null
+++ b/test/unit/logic_calendar_share_tests.erl
@@ -0,0 +1,137 @@
+-module(logic_calendar_share_tests).
+-include_lib("eunit/include/eunit.hrl").
+-include("records.hrl").
+
+-define(TABLES, [user, calendar, calendar_share, calendar_share_invite, notification, subscription]).
+
+setup() ->
+  eh_test_support:start_mnesia(),
+  eh_test_support:ensure_tables(?TABLES),
+  ok.
+
+cleanup(_) ->
+  eh_test_support:delete_tables(?TABLES),
+  eh_test_support:stop_mnesia(),
+  ok.
+
+logic_calendar_share_test_() ->
+  {foreach, fun setup/0, fun cleanup/1, [
+    {"personal invite accept mirror default", fun test_personal_invite_accept/0},
+    {"commercial deputy write can_edit", fun test_commercial_deputy/0},
+    {"decline invite", fun test_decline/0},
+    {"duplicate pending", fun test_duplicate_pending/0},
+    {"revoke share", fun test_revoke/0},
+    {"personal access via share read", fun test_personal_share_access/0},
+    {"list calendars includes shared", fun test_list_includes_shared/0},
+    {"search excludes personal", fun test_search_excludes_personal/0}
+  ]}.
+
+seed_owner_personal() ->
+  Id = base64:encode(crypto:strong_rand_bytes(12), #{padding => false}),
+  Owner = eh_test_support:make_user(#{
+    id => Id, email => <<"own-", Id/binary, "@ex.com">>, status => active}),
+  mnesia:dirty_write(Owner),
+  {ok, Cal} = core_calendar:create(Owner#user.id, <<"Default">>, <<>>, manual, personal),
+  {Owner#user.id, Cal#calendar.id}.
+
+seed_owner_commercial() ->
+  Id = base64:encode(crypto:strong_rand_bytes(12), #{padding => false}),
+  Owner = eh_test_support:make_user(#{
+    id => Id, email => <<"co-", Id/binary, "@ex.com">>, status => active}),
+  mnesia:dirty_write(Owner),
+  {ok, _} = core_subscription:create(Owner#user.id, monthly, true),
+  {ok, Cal} = core_calendar:create(Owner#user.id, <<"Studio">>, <<>>, manual, commercial),
+  {Owner#user.id, Cal#calendar.id}.
+
+make_active_user(Email) ->
+  Id = base64:encode(crypto:strong_rand_bytes(12), #{padding => false}),
+  U = eh_test_support:make_user(#{
+    id => Id, email => Email, status => active, nickname => <<"n-", Id/binary>>}),
+  mnesia:dirty_write(U),
+  U.
+
+test_personal_invite_accept() ->
+  {OwnerId, CalId} = seed_owner_personal(),
+  Co = make_active_user(<<"co@ex.com">>),
+  {ok, Inv} = logic_calendar_share_invite:create(OwnerId, CalId,
+    #{user_id => Co#user.id}, #{rights => write}),
+  ?assertEqual(pending, Inv#calendar_share_invite.status),
+  {ok, Inv2, Share} = logic_calendar_share_invite:accept(Co#user.id,
+    Inv#calendar_share_invite.id, #{}),
+  ?assertEqual(accepted, Inv2#calendar_share_invite.status),
+  ?assertEqual(write, Share#calendar_share.rights),
+  ?assertEqual(true, Share#calendar_share.mirror_to_default),
+  {ok, Cal} = core_calendar:get_by_id(CalId),
+  ?assert(logic_calendar:can_edit(Co#user.id, Cal)),
+  ?assert(logic_calendar:can_access(Co#user.id, Cal)).
+
+test_commercial_deputy() ->
+  {OwnerId, CalId} = seed_owner_commercial(),
+  Dep = make_active_user(<<"dep@ex.com">>),
+  {ok, Inv} = logic_calendar_share_invite:create(OwnerId, CalId,
+    #{user_id => Dep#user.id}, #{rights => write}),
+  {ok, _, Share} = logic_calendar_share_invite:accept(Dep#user.id,
+    Inv#calendar_share_invite.id, #{}),
+  ?assertEqual(false, Share#calendar_share.mirror_to_default),
+  {ok, Cal} = core_calendar:get_by_id(CalId),
+  ?assert(logic_calendar:can_edit(Dep#user.id, Cal)),
+  ?assertEqual({error, access_denied},
+    logic_calendar:delete_calendar(Dep#user.id, CalId)).
+
+test_decline() ->
+  {OwnerId, CalId} = seed_owner_personal(),
+  U = make_active_user(<<"d@ex.com">>),
+  {ok, Inv} = logic_calendar_share_invite:create(OwnerId, CalId,
+    #{user_id => U#user.id}, #{}),
+  {ok, Inv2} = logic_calendar_share_invite:decline(U#user.id, Inv#calendar_share_invite.id),
+  ?assertEqual(declined, Inv2#calendar_share_invite.status),
+  ?assertEqual({error, not_found}, core_calendar_share:get(CalId, U#user.id)).
+
+test_duplicate_pending() ->
+  {OwnerId, CalId} = seed_owner_personal(),
+  U = make_active_user(<<"dup@ex.com">>),
+  {ok, _} = logic_calendar_share_invite:create(OwnerId, CalId, #{user_id => U#user.id}, #{}),
+  ?assertEqual({error, already_pending},
+    logic_calendar_share_invite:create(OwnerId, CalId, #{user_id => U#user.id}, #{})).
+
+test_revoke() ->
+  {OwnerId, CalId} = seed_owner_personal(),
+  U = make_active_user(<<"rev@ex.com">>),
+  {ok, Inv} = logic_calendar_share_invite:create(OwnerId, CalId, #{user_id => U#user.id}, #{}),
+  {ok, _, _} = logic_calendar_share_invite:accept(U#user.id, Inv#calendar_share_invite.id, #{}),
+  ok = logic_calendar_share:revoke(OwnerId, CalId, U#user.id),
+  {ok, Cal} = core_calendar:get_by_id(CalId),
+  ?assertNot(logic_calendar:can_access(U#user.id, Cal)).
+
+test_personal_share_access() ->
+  {OwnerId, CalId} = seed_owner_personal(),
+  U = make_active_user(<<"read@ex.com">>),
+  Stranger = make_active_user(<<"str@ex.com">>),
+  {ok, Inv} = logic_calendar_share_invite:create(OwnerId, CalId,
+    #{user_id => U#user.id}, #{rights => read}),
+  {ok, _, _} = logic_calendar_share_invite:accept(U#user.id, Inv#calendar_share_invite.id,
+    #{mirror_to_default => false}),
+  {ok, Cal} = core_calendar:get_by_id(CalId),
+  ?assert(logic_calendar:can_access(U#user.id, Cal)),
+  ?assertNot(logic_calendar:can_edit(U#user.id, Cal)),
+  ?assertNot(logic_calendar:can_access(Stranger#user.id, Cal)).
+
+test_list_includes_shared() ->
+  {OwnerId, CalId} = seed_owner_personal(),
+  U = make_active_user(<<"list@ex.com">>),
+  {ok, Inv} = logic_calendar_share_invite:create(OwnerId, CalId, #{user_id => U#user.id}, #{}),
+  {ok, _, _} = logic_calendar_share_invite:accept(U#user.id, Inv#calendar_share_invite.id, #{}),
+  {ok, List} = logic_calendar:list_calendars(U#user.id),
+  Ids = [C#calendar.id || C <- List],
+  ?assert(lists:member(CalId, Ids)).
+
+test_search_excludes_personal() ->
+  {_OwnerId, CalId} = seed_owner_personal(),
+  {ok, Cal} = core_calendar:get_by_id(CalId),
+  ?assertEqual(false, logic_search_discoverable(Cal)).
+
+%% Access private helper via same rule as logic_search (duplicated check).
+logic_search_discoverable(#calendar{type = personal}) -> false;
+logic_search_discoverable(#calendar{type = commercial} = C) ->
+  logic_calendar:booking_open(C);
+logic_search_discoverable(_) -> false.