Core user data and leaderboard commands.

Added flexibility to data `update_where`.
Added interactive utils, with improved pager.
Added user data table, with caching and transactional interface.
Added `topcoins` command to `Economy`
Added `top` command to `Study`

bot/core/tables.py

@@ -0,0 +1,31 @@
+from psycopg2.extras import execute_values
+
+from cachetools import TTLCache
+from data import RowTable, Table
+
+
+users = RowTable(
+    'lions',
+    ('userid', 'tracked_time', 'coins'),
+    'userid',
+    cache=TTLCache(5000, ttl=60*5)
+)
+
+
+@users.save_query
+def add_coins(userid_coins):
+    with users.conn:
+        cursor = users.conn.cursor()
+        data = execute_values(
+            cursor,
+            """
+            UPDATE lions
+            SET coins = coins + t.diff
+            FROM (VALUES %s) AS t (userid, diff)
+            WHERE lions.userid = t.userid
+            RETURNING *
+            """,
+            userid_coins,
+            fetch=True
+        )
+        return users._make_rows(*data)