feat: import Chinese-localized Buzz source snapshot

Signed-off-by: cls_宁波本机 <908705107@qq.com>

migrations/0019_mesh_status_retention.sql

@@ -0,0 +1,43 @@
+-- Mesh status is a heartbeat carried in a reserved kind:30003 coordinate.
+-- Only the live head has product value; retaining every superseded 45-second
+-- payload creates unbounded physical history. Clean up existing history and
+-- cover soft-delete writes from older relay binaries during rolling deploys.
+
+DELETE FROM event_mentions mention
+USING events status
+WHERE mention.community_id = status.community_id
+  AND mention.event_id = status.id
+  AND status.kind = 30003
+  AND status.d_tag LIKE 'buzz-mesh-member-status:%'
+  AND status.deleted_at IS NOT NULL
+  AND status.tags @> '[["k", "buzz-mesh-status"]]'::jsonb;
+
+DELETE FROM events
+WHERE kind = 30003
+  AND d_tag LIKE 'buzz-mesh-member-status:%'
+  AND deleted_at IS NOT NULL
+  AND tags @> '[["k", "buzz-mesh-status"]]'::jsonb;
+
+CREATE FUNCTION purge_soft_deleted_buzz_mesh_status() RETURNS trigger AS $$
+BEGIN
+    IF OLD.deleted_at IS NULL
+       AND NEW.deleted_at IS NOT NULL
+       AND NEW.kind = 30003
+       AND NEW.d_tag LIKE 'buzz-mesh-member-status:%'
+       AND NEW.tags @> '[["k", "buzz-mesh-status"]]'::jsonb THEN
+        DELETE FROM events
+        WHERE community_id = NEW.community_id
+          AND created_at = NEW.created_at
+          AND id = NEW.id;
+
+        DELETE FROM event_mentions
+        WHERE community_id = NEW.community_id AND event_id = NEW.id;
+    END IF;
+
+    RETURN NULL;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE TRIGGER trg_events_purge_soft_deleted_buzz_mesh_status
+    AFTER UPDATE OF deleted_at ON events
+    FOR EACH ROW EXECUTE FUNCTION purge_soft_deleted_buzz_mesh_status();