hi , how i can convert this store procedure 
to PostgreSQL function, especially I really dont know how to set type 
to readonly in PostgreSQL.
thanks


ALTERPROCEDURE [dbo].[sp_DeleteUserData]
      @ACDetailsID dbo.ACdetailsID_type READONLY
      
AS
 
DECLARE@ID int
begintry
begintransaction
 
 DECLARE c_ACDetailsID CURSOR FOR SELECT id FROM @ACDetailsID
 OPEN c_ACDetailsID
 FETCH NEXT FROM c_ACDetailsID INTO @ID
 WHILE (@@FETCH_STATUS = 0) BEGIN
 
      delete from UserAccountDetails  where UserDataAcountId=@ID 
      delete from UserAC where UserDataAcountId=@ID 
      
 FETCH NEXT FROM c_ACDetailsID INTO @ID
End--end of while loop       
 
committransaction      
CLOSEc_ACDetailsID
DEALLOCATEc_ACDetailsID
endtry
 
begincatch
      rollback transaction;
      print error_message(

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