v2.0.0

Removed

• Breaking. The direct writers are gone: ClickHouseExposureTracker,
  ClickHouseConversionTracker, ClickHouseTrackingFlushMiddleware,
  ClickHouseWriterSink, CompositeTrackingBatchSink,
  TrackingBatchSinkInterface, TrackingObserverInterface and
  NullTrackingObserver. Under PHP-FPM the flush middleware issued a
  synchronous 1–3 row INSERT per request, before the response was emitted, and
  the buffer never filled because the worker did not outlive the request.
  Events now arrive through the durable outbox exporter or a log-shipping
  collector.
• Breaking. config/di.php binds nothing. It used to bind ExposureTracker
  and ConversionTracker, which made installing this package alongside the
  outbox adapter a yiisoft/config Duplicate key error.

Added

• Canonical analytics schema v2 (ab_exposures_v2, ab_conversions_v2) with
  event_id, occurred_at, decision_reason, assignment_source,
  experiment_revision and dimensions, on
  ReplacingMergeTree ordered by (experiment, event_id).
• AnalyticsSchemaV2 — the column contract producers check against, pinned to
  the shipped DDL by a test.
• SchemaMigrations — applies the shipped .sql without every consumer
  hardcoding a vendor/ path and its own placeholder map.

Changed

• Breaking. Requires rasuvaeff/yii3-ab-testing ^2.0.
• The v1 tables are untouched and still created: they hold history that is not
  migrated into v2, because their rows have no event identity and their ts is
  ingestion time rather than event time.

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog,
and this project adheres to Semantic Versioning.