add CH performance projections

db/clickhouse/migrations/14_add_performance_projections.sql

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+-- Add projections for website activity feeds and event property filters.
+-- Note: these are intentionally not materialized here to avoid a large
+-- backfill during migration on production-sized datasets.
+
+ALTER TABLE umami.website_event
+ADD PROJECTION website_event_activity_projection (
+    SELECT *
+    ORDER BY (
+        website_id,
+        created_at,
+        event_id
+    )
+);
+
+ALTER TABLE umami.event_data
+ADD PROJECTION event_data_property_filter_projection (
+    SELECT *
+    ORDER BY (
+        website_id,
+        data_key,
+        data_type,
+        string_value,
+        number_value,
+        date_value,
+        created_at,
+        event_id
+    )
+);