Fix performance of percentile calculation for annual reports (#32765)

app/lib/annual_report/percentiles.rb

@@ -1,62 +1,37 @@
 # frozen_string_literal: true
 
 class AnnualReport::Percentiles < AnnualReport::Source
+  def self.prepare(year)
+    AnnualReport::StatusesPerAccountCount.connection.exec_query(<<~SQL.squish, nil, [year, Mastodon::Snowflake.id_at(DateTime.new(year).beginning_of_year), Mastodon::Snowflake.id_at(DateTime.new(year).end_of_year)])
+      INSERT INTO annual_report_statuses_per_account_counts (year, account_id, statuses_count)
+      SELECT $1, account_id, count(*)
+      FROM statuses
+      WHERE id BETWEEN $2 AND $3
+      AND (local OR uri IS NULL)
+      GROUP BY account_id
+      ON CONFLICT (year, account_id) DO NOTHING
+    SQL
+  end
+
   def generate
     {
       percentiles: {
-        followers: (total_with_fewer_followers / (total_with_any_followers + 1.0)) * 100,
-        statuses: (total_with_fewer_statuses / (total_with_any_statuses + 1.0)) * 100,
+        statuses: 100.0 - ((total_with_fewer_statuses / (total_with_any_statuses + 1.0)) * 100),
       },
     }
   end
 
   private
 
-  def followers_gained
-    @followers_gained ||= @account.passive_relationships.where("date_part('year', follows.created_at) = ?", @year).count
-  end
-
   def statuses_created
     @statuses_created ||= report_statuses.count
   end
 
-  def total_with_fewer_followers
-    @total_with_fewer_followers ||= Follow.find_by_sql([<<~SQL.squish, { year: @year, comparison: followers_gained }]).first.total
-      WITH tmp0 AS (
-        SELECT follows.target_account_id
-        FROM follows
-        INNER JOIN accounts ON accounts.id = follows.target_account_id
-        WHERE date_part('year', follows.created_at) = :year
-          AND accounts.domain IS NULL
-        GROUP BY follows.target_account_id
-        HAVING COUNT(*) < :comparison
-      )
-      SELECT count(*) AS total
-      FROM tmp0
-    SQL
-  end
-
   def total_with_fewer_statuses
-    @total_with_fewer_statuses ||= Status.find_by_sql([<<~SQL.squish, { comparison: statuses_created, min_id: year_as_snowflake_range.first, max_id: year_as_snowflake_range.last }]).first.total
-      WITH tmp0 AS (
-        SELECT statuses.account_id
-        FROM statuses
-        INNER JOIN accounts ON accounts.id = statuses.account_id
-        WHERE statuses.id BETWEEN :min_id AND :max_id
-          AND accounts.domain IS NULL
-        GROUP BY statuses.account_id
-        HAVING count(*) < :comparison
-      )
-      SELECT count(*) AS total
-      FROM tmp0
-    SQL
-  end
-
-  def total_with_any_followers
-    @total_with_any_followers ||= Follow.where("date_part('year', follows.created_at) = ?", @year).joins(:target_account).merge(Account.local).count('distinct follows.target_account_id')
+    @total_with_fewer_statuses ||= AnnualReport::StatusesPerAccountCount.where(year: year).where(statuses_count: ...statuses_created).count
   end
 
   def total_with_any_statuses
-    @total_with_any_statuses ||= Status.where(id: year_as_snowflake_range).joins(:account).merge(Account.local).count('distinct statuses.account_id')
+    @total_with_any_statuses ||= AnnualReport::StatusesPerAccountCount.where(year: year).count
   end
 end