Juan Fernando Castro e32bfa839d fix: count one app open per account per app per hour (#4152)
* fix: count one app open per account per app per day

`app_opens` is read two ways at once: `open_count` is a row count and
`user_count` is distinct accounts. A repeated open moves the first
without the first moving the second, and the incentive report prices
opens.

An open is now marked as it is recorded and skipped for the rest of the
day, before both the row and the event ClickHouse ingests, so the two
stores agree. The marker is set only when absent, so the first open of
the day wins a race; an unreachable marker counts the open, since
counting twice beats not counting.

* fix: count one app open per account per app per day, at the count

Dropped the row-suppression approach. `app_opens` is not only a counter:
`getRecentAppOpens` orders the desktop's recent list by `MAX(_id)`, and
`app.opened` is the socket event other tabs reorder on. Suppressing the
repeat row froze both at the first open of the day.

Every open is recorded as before. `open_count` counts each account once
per day instead, which is the figure `user_count` is read against.

`countDistinctUserDays` folds the pair into one number because
`COUNT(DISTINCT a, b)` is MySQL-only, and `dayBucket` covers MySQL's
decimal division. ClickHouse has uniqExact over the tuple.

Note the figure's meaning changes at deploy: a period spanning it mixes
rows with account-days, so a comparison across that point is not one.

* fix: count one app open per account per app per hour

Review feedback: a day is too long a window for the repeat to collapse
into. The period is now an argument rather than a baked-in 86400, held in
one constant on AppStore beside the other store policy numbers, so the SQL
and ClickHouse sites cannot drift and a future change is one line.

The fold `COUNT(DISTINCT user * N + bucket)` is only injective while the
bucket index stays under N. Hourly buckets are 24x the day index and pass
the old 1000000 in 2084, so N moves to 10000000.

Buckets are clock hours, not a rolling window, so two opens a minute apart
either side of the hour still count twice — tested, and the same property
the day version had at UTC midnight.

The detailed-stats fixture gave its repeat open a 60s offset, which under
hourly buckets would have counted twice whenever the suite ran in the first
minute of an hour. It now shares a timestamp with the open it repeats.
2026-10-14 11:54:17 -04:00
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Puter

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