Additional parts of the API, DB layer.

Implemented additional API functions:
    * dispatch_timeline/4
    * dispatch_event_by_id/4
    * get_timeline/3
    * put_timeline/3
    * post_timeline/3
    * make_json_404/2, make_json_405/2, make_json_500/1
Implemented ts_timeline:lookup/2
Implemented ts_entry:lookup/2

src/ts_entry.erl

@@ -1,5 +1,5 @@
 -module(ts_entry).
--export([create_table/1, new/1, update/1, list/3]).
+-export([create_table/1, new/1, update/1, lookup/3, list/3]).
 
 -include("ts_db_records.hrl").
 -include_lib("stdlib/include/qlc.hrl").
@@ -28,6 +28,12 @@ update(ER = #ts_entry()) ->
         [_Record] -> mnesia:dirty_write(ER)
     end.
 
+lookup(Username, TimelineId, EntryId) ->
+    case mnesia:dirty_read(ts_entry, {Username, TimelineId, EntryId}) of
+        [] -> no_record;
+        [Entry] -> Entry
+    end.
+
 list({Username, Timeline}, Start, Length)
 when is_integer(Start) and is_integer(Length) ->
     ts_common:list(