Starting DB implementation.

Added Makefile, id_counter.erl, and yaws.conf.
Created ts_common module. Will contain common DB code. So far only list/3.
Created ts_timeline module. DB code for storing timeline entries.
Created ts_entry module, DB code for storing timelin entries.

src/ts_entry.erl

@@ -0,0 +1,19 @@
+-module(ts_entry).
+-export([create_table/1, new/1, update/1, list/3]).
+
+-include("ts_db_records.hrl").
+-include_lib("stdlib/include/qlc.hrl").
+
+create_table(TableOpts) ->
+    mnesia:create_table(ts_entry,
+        TableOpts ++ [{attributes, record_info(fields, ts_entry)},
+                      {type, ordered_set}, {index, timestamp}]).
+
+new(ER = #ts_entry()) ->
+    {atmoic, NewRow) = mnesia:transaction(fun() ->
+        {Username, TimelineId, _} = ER#ts_entry.ref,
+        NextId = id_counter:next_counter(ts_entry_id),
+        NewRow = ER#ts_entry{ref = {Username, TimelineId, NextId}},
+        ok = mnesia:write(NewRow),
+        NewRow end),
+    {ok, NewRow}.