fix: meeting 참석자 데이터 정규화

meeting/src/main/resources/db/migration/V2__create_meeting_participants_table.sql

@@ -0,0 +1,41 @@
+-- 회의 참석자 테이블 생성
+CREATE TABLE IF NOT EXISTS meeting_participants (
+    meeting_id VARCHAR(50) NOT NULL,
+    user_id VARCHAR(100) NOT NULL,
+    invitation_status VARCHAR(20) DEFAULT 'PENDING',
+    attended BOOLEAN DEFAULT FALSE,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    PRIMARY KEY (meeting_id, user_id),
+    CONSTRAINT fk_meeting_participants_meeting
+        FOREIGN KEY (meeting_id) REFERENCES meetings(meeting_id)
+        ON DELETE CASCADE
+);
+
+-- 기존 meetings 테이블의 participants 데이터를 meeting_participants 테이블로 마이그레이션
+INSERT INTO meeting_participants (meeting_id, user_id, invitation_status, attended, created_at, updated_at)
+SELECT
+    m.meeting_id,
+    TRIM(participant) as user_id,
+    'PENDING' as invitation_status,
+    FALSE as attended,
+    m.created_at,
+    m.updated_at
+FROM meetings m
+CROSS JOIN LATERAL unnest(string_to_array(m.participants, ',')) AS participant
+WHERE m.participants IS NOT NULL AND m.participants != '';
+
+-- meetings 테이블에서 participants 컬럼 삭제
+ALTER TABLE meetings DROP COLUMN IF EXISTS participants;
+
+-- 인덱스 생성
+CREATE INDEX idx_meeting_participants_user_id ON meeting_participants(user_id);
+CREATE INDEX idx_meeting_participants_invitation_status ON meeting_participants(invitation_status);
+CREATE INDEX idx_meeting_participants_meeting_id_status ON meeting_participants(meeting_id, invitation_status);
+
+-- 코멘트 추가
+COMMENT ON TABLE meeting_participants IS '회의 참석자 정보';
+COMMENT ON COLUMN meeting_participants.meeting_id IS '회의 ID';
+COMMENT ON COLUMN meeting_participants.user_id IS '사용자 ID (이메일)';
+COMMENT ON COLUMN meeting_participants.invitation_status IS '초대 상태 (PENDING, ACCEPTED, DECLINED)';
+COMMENT ON COLUMN meeting_participants.attended IS '참석 여부';