perf(db): incremental document stats cache

database/user_streaks.sql

@@ -0,0 +1,117 @@
+---------------------------------------------------------------
+---------------------------- Views ----------------------------
+---------------------------------------------------------------
+
+--------------------------------
+--------- User Streaks ---------
+--------------------------------
+
+CREATE VIEW view_user_streaks AS
+
+WITH document_windows AS (
+    SELECT
+        activity.user_id,
+        users.timezone,
+        DATE(
+            LOCAL_TIME(activity.start_time, users.timezone),
+            'weekday 0', '-7 day'
+        ) AS weekly_read,
+        DATE(LOCAL_TIME(activity.start_time, users.timezone)) AS daily_read
+    FROM activity
+    LEFT JOIN users ON users.id = activity.user_id
+    GROUP BY activity.user_id, weekly_read, daily_read
+),
+weekly_partitions AS (
+    SELECT
+        user_id,
+        timezone,
+        'WEEK' AS "window",
+        weekly_read AS read_window,
+        row_number() OVER (
+            PARTITION BY user_id ORDER BY weekly_read DESC
+        ) AS seqnum
+    FROM document_windows
+    GROUP BY user_id, weekly_read
+),
+daily_partitions AS (
+    SELECT
+        user_id,
+        timezone,
+        'DAY' AS "window",
+        daily_read AS read_window,
+        row_number() OVER (
+            PARTITION BY user_id ORDER BY daily_read DESC
+        ) AS seqnum
+    FROM document_windows
+    GROUP BY user_id, daily_read
+),
+streaks AS (
+    SELECT
+        COUNT(*) AS streak,
+        MIN(read_window) AS start_date,
+        MAX(read_window) AS end_date,
+        window,
+        user_id,
+        timezone
+    FROM daily_partitions
+    GROUP BY
+        timezone,
+        user_id,
+        DATE(read_window, '+' || seqnum || ' day')
+
+    UNION ALL
+
+    SELECT
+        COUNT(*) AS streak,
+        MIN(read_window) AS start_date,
+        MAX(read_window) AS end_date,
+        window,
+        user_id,
+        timezone
+    FROM weekly_partitions
+    GROUP BY
+        timezone,
+        user_id,
+        DATE(read_window, '+' || (seqnum * 7) || ' day')
+),
+max_streak AS (
+    SELECT
+        MAX(streak) AS max_streak,
+        start_date AS max_streak_start_date,
+        end_date AS max_streak_end_date,
+        window,
+        user_id
+    FROM streaks
+    GROUP BY user_id, window
+),
+current_streak AS (
+    SELECT
+        streak AS current_streak,
+        start_date AS current_streak_start_date,
+        end_date AS current_streak_end_date,
+        window,
+        user_id
+    FROM streaks
+    WHERE CASE
+      WHEN window = "WEEK" THEN
+          DATE(LOCAL_TIME(STRFTIME('%Y-%m-%dT%H:%M:%SZ', 'now'), timezone), 'weekday 0', '-14 day') = current_streak_end_date
+          OR DATE(LOCAL_TIME(STRFTIME('%Y-%m-%dT%H:%M:%SZ', 'now'), timezone), 'weekday 0', '-7 day') = current_streak_end_date
+      WHEN window = "DAY" THEN
+          DATE(LOCAL_TIME(STRFTIME('%Y-%m-%dT%H:%M:%SZ', 'now'), timezone), '-1 day') = current_streak_end_date
+          OR DATE(LOCAL_TIME(STRFTIME('%Y-%m-%dT%H:%M:%SZ', 'now'), timezone)) = current_streak_end_date
+    END
+    GROUP BY user_id, window
+)
+SELECT
+    max_streak.user_id,
+    max_streak.window,
+    IFNULL(max_streak, 0) AS max_streak,
+    IFNULL(max_streak_start_date, "N/A") AS max_streak_start_date,
+    IFNULL(max_streak_end_date, "N/A") AS max_streak_end_date,
+    IFNULL(current_streak, 0) AS current_streak,
+    IFNULL(current_streak_start_date, "N/A") AS current_streak_start_date,
+    IFNULL(current_streak_end_date, "N/A") AS current_streak_end_date
+FROM max_streak
+LEFT JOIN current_streak ON
+    current_streak.user_id = max_streak.user_id
+    AND current_streak.window = max_streak.window;