Merge branch '441485-db-structure-for-storing-code-suggestion-events' into 'master'

Add DB structure for code suggestions

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/147992



Merged-by: Pedro Pombeiro <noreply@pedro.pombei.ro>
Approved-by: Pavel Shutsin <pshutsin@gitlab.com>
Approved-by: Pedro Pombeiro <noreply@pedro.pombei.ro>
Reviewed-by: Pedro Pombeiro <noreply@pedro.pombei.ro>
Reviewed-by: Pavel Shutsin <pshutsin@gitlab.com>
Co-authored-by: Adam Hegyi <ahegyi@gitlab.com>

db/click_house/migrate/main/20240327071035_create_code_suggestion_tables.rb

+# frozen_string_literal: true
+
+class CreateCodeSuggestionTables < ClickHouse::Migration
+  def up
+    execute <<~SQL
+      CREATE TABLE IF NOT EXISTS code_suggestion_usages
+      (
+        user_id UInt64 DEFAULT 0,
+        event UInt8 DEFAULT 0,
+        namespace_path String DEFAULT '0/',
+        timestamp DateTime64(6, 'UTC') DEFAULT now64()
+      ) ENGINE = ReplacingMergeTree
+      PARTITION BY toYear(timestamp)
+      ORDER BY (user_id, event, timestamp)
+    SQL
+
+    execute <<~SQL
+      CREATE TABLE IF NOT EXISTS code_suggestion_daily_usages
+      (
+        user_id UInt64 DEFAULT 0,
+        timestamp Date32 DEFAULT toDate(now64()),
+      ) ENGINE = ReplacingMergeTree
+      PARTITION BY toYear(timestamp)
+      ORDER BY (user_id, timestamp)
+      SETTINGS index_granularity = 64
+    SQL
+
+    execute <<~SQL
+      CREATE MATERIALIZED VIEW IF NOT EXISTS code_suggestion_daily_usages_mv
+      TO code_suggestion_daily_usages
+      AS
+      SELECT
+        user_id,
+        timestamp
+      FROM code_suggestion_usages
+      WHERE event = 1
+      GROUP BY user_id, timestamp
+    SQL
+  end
+
+  def down
+    execute <<~SQL
+      DROP VIEW IF EXISTS code_suggestion_daily_usages_mv
+    SQL
+
+    execute <<~SQL
+      DROP TABLE IF EXISTS code_suggestion_daily_usages
+    SQL
+
+    execute <<~SQL
+      DROP TABLE IF EXISTS code_suggestion_usages
+    SQL
+  end
+end