(data): Rebuild study data views.

Starts migration `v9 -> v10`.
Rebuild the data views so they get the new columns.

data/migration/v9-v10/migration.sql

@@ -0,0 +1,48 @@
+DROP VIEW current_sessions_totals CASCADE;
+
+
+-- Rebuild study data views
+CREATE VIEW current_sessions_totals AS
+  SELECT
+    *,
+    EXTRACT(EPOCH FROM (NOW() - start_time)) AS total_duration,
+    stream_duration + COALESCE(EXTRACT(EPOCH FROM (NOW() - stream_start)), 0) AS total_stream_duration,
+    video_duration + COALESCE(EXTRACT(EPOCH FROM (NOW() - video_start)), 0) AS total_video_duration,
+    live_duration + COALESCE(EXTRACT(EPOCH FROM (NOW() - live_start)), 0) AS total_live_duration
+  FROM current_sessions;
+
+
+CREATE VIEW members_totals AS
+  SELECT
+    *,
+    sesh.start_time AS session_start,
+    tracked_time + COALESCE(sesh.total_duration, 0) AS total_tracked_time,
+    coins + COALESCE((sesh.total_duration * sesh.hourly_coins + sesh.live_duration * sesh.hourly_live_coins) / 3600, 0) AS total_coins
+  FROM members
+  LEFT JOIN current_sessions_totals sesh USING (guildid, userid);
+
+
+CREATE VIEW member_ranks AS
+  SELECT
+    *,
+    row_number() OVER (PARTITION BY guildid ORDER BY total_tracked_time DESC, userid ASC) AS time_rank,
+    row_number() OVER (PARTITION BY guildid ORDER BY total_coins DESC, userid ASC) AS coin_rank
+  FROM members_totals;
+
+CREATE VIEW current_study_badges AS
+  SELECT
+    *,
+    (SELECT r.badgeid
+      FROM study_badges r
+      WHERE r.guildid = members_totals.guildid AND members_totals.total_tracked_time > r.required_time
+      ORDER BY r.required_time DESC
+      LIMIT 1) AS current_study_badgeid
+    FROM members_totals;
+
+CREATE VIEW new_study_badges AS
+  SELECT 
+    current_study_badges.*
+  FROM current_study_badges
+  WHERE
+    last_study_badgeid IS DISTINCT FROM current_study_badgeid
+  ORDER BY guildid;