BREAK: add primary index to events_pageviews table

pkg/embedded/ch_migrations/20240320095915_BREAK_recreate_events_pageviews_table.up.sql

@@ -0,0 +1,28 @@
+RENAME TABLE events_pageviews TO events_pageviews_old;
+
+-- Create a more optimized version of events_pageviews table.
+-- This version use a better order by clause and adds a partition by clause
+-- that can't be added to an existing table.
+
+-- It is beneficial for queries to order the primary key columns by cardinality in ascending order.
+-- https://clickhouse.com/docs/en/optimize/sparse-primary-indexes#summary
+CREATE TABLE events_pageviews (
+	timestamp DateTime('UTC'),
+	domain String,
+	path String,
+	operating_system LowCardinality(String),
+	browser_family LowCardinality(String),
+	device LowCardinality(String),
+	referrer_domain String,
+	country_code LowCardinality(String)
+)
+ENGINE = MergeTree
+PRIMARY KEY (domain, path)
+ORDER BY (domain, path, toDate(timestamp), operating_system, browser_family, device, referrer_domain, country_code)
+PARTITION BY toYYYYMM(timestamp);
+
+-- Move rows to new table.
+INSERT INTO events_pageviews SELECT * FROM events_pageviews_old;
+
+-- Delete old table.
+DROP TABLE events_pageviews_old;