feature (stats): Weekly and monthly goals.

Add a new editing interface for weekly and monthly goals.
Textual viewing interface is currently a stub.
Add `month_timestamp` and `week_timestamp` lion properties.

bot/modules/stats/data.py

@@ -1,4 +1,6 @@
-from data import Table
+from cachetools import TTLCache
+
+from data import Table, RowTable
 
 
 profile_tags = Table('member_profile_tags', attach_as='profile_tags')
@@ -11,3 +13,27 @@ def get_tags_for(guildid, userid):
         _extra="ORDER BY tagid ASC"
     )
     return [row['tag'] for row in rows]
+
+
+weekly_goals = RowTable(
+    'member_weekly_goals',
+    ('guildid', 'userid', 'weekid', 'study_goal', 'task_goal'),
+    ('guildid', 'userid', 'weekid'),
+    cache=TTLCache(5000, 60 * 60 * 24),
+    attach_as='weekly_goals'
+)
+
+
+# NOTE: Not using a RowTable here since these will almost always be mass-selected
+weekly_tasks = Table('member_weekly_goal_tasks')
+
+
+monthly_goals = RowTable(
+    'member_monthly_goals',
+    ('guildid', 'userid', 'monthid', 'study_goal', 'task_goal'),
+    ('guildid', 'userid', 'monthid'),
+    cache=TTLCache(5000, 60 * 60 * 24),
+    attach_as='monthly_goals'
+)
+
+monthly_tasks = Table('member_monthly_goal_tasks')