Initial open source release

deploy/migrations/0007_read_history_events.up.sql

@@ -0,0 +1,23 @@
+-- 0007_read_history_events: persist readHistory update events for getDifference.
+--
+-- updateReadHistoryInbox：真正发生已读推进时递增 pts，并给其它 session / getDifference 留可补偿事件。
+
+ALTER TABLE update_events
+    ADD COLUMN IF NOT EXISTS peer_type VARCHAR(16),
+    ADD COLUMN IF NOT EXISTS peer_id BIGINT,
+    ADD COLUMN IF NOT EXISTS max_id INT NOT NULL DEFAULT 0,
+    ADD COLUMN IF NOT EXISTS still_unread_count INT NOT NULL DEFAULT 0;
+
+ALTER TABLE update_events
+    DROP CONSTRAINT IF EXISTS update_events_type_check;
+
+ALTER TABLE update_events
+    ADD CONSTRAINT update_events_type_check
+    CHECK (event_type IN ('new_message', 'read_history_inbox'));
+
+ALTER TABLE update_events
+    DROP CONSTRAINT IF EXISTS update_events_peer_type_check;
+
+ALTER TABLE update_events
+    ADD CONSTRAINT update_events_peer_type_check
+    CHECK (peer_type IS NULL OR peer_type IN ('user'));