refact: 도메인 수정으로 인한 DDL 파일 작성

Author: audwls239

NBE_5_7_2_02TEAM/src/main/resources/db/migration/prod/V3__chatCount.sql

@@ -0,0 +1,5 @@
+-- chat_room 테이블에 member_count, last_chat_id 컬럼 추가
+ALTER TABLE chat_room
+    ADD COLUMN member_count bigint NOT NULL DEFAULT 0;
+ALTER TABLE chat_room
+    ADD COLUMN last_chat_id bigint;

NBE_5_7_2_02TEAM/src/test/resources/db/migration/test/V3__chatCount.sql

@@ -0,0 +1,5 @@
+-- chat_room 테이블에 member_count, last_chat_id 컬럼 추가
+ALTER TABLE chat_room
+    ADD COLUMN member_count bigint NOT NULL DEFAULT 0;
+ALTER TABLE chat_room
+    ADD COLUMN last_chat_id bigint;