CREATE TABLE IF NOT EXISTS qipai_cleaning_task_members (
  id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
  tenant_id BIGINT UNSIGNED NOT NULL,
  task_id BIGINT UNSIGNED NOT NULL,
  user_id BIGINT UNSIGNED NOT NULL,
  member_role VARCHAR(16) NOT NULL DEFAULT 'ASSIST',
  reward_cents INT UNSIGNED NOT NULL DEFAULT 0,
  joined_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
  removed_at DATETIME(3) NULL,
  settled_at DATETIME(3) NULL,
  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
  updated_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
  CONSTRAINT fk_qipai_cleaning_task_members_tenant FOREIGN KEY (tenant_id)
    REFERENCES qipai_tenants(id),
  CONSTRAINT fk_qipai_cleaning_task_members_task FOREIGN KEY (task_id)
    REFERENCES qipai_cleaning_tasks(id),
  CONSTRAINT fk_qipai_cleaning_task_members_user FOREIGN KEY (user_id)
    REFERENCES qipai_users(id),
  UNIQUE KEY uq_qipai_cleaning_task_member (tenant_id, task_id, user_id),
  KEY idx_qipai_cleaning_task_member_user (tenant_id, user_id, removed_at, settled_at),
  KEY idx_qipai_cleaning_task_member_task (tenant_id, task_id, removed_at),
  CONSTRAINT chk_qipai_cleaning_task_member_role CHECK (member_role IN ('LEAD', 'ASSIST'))
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

ALTER TABLE qipai_cleaning_settlement_items
  DROP INDEX uq_qipai_cleaning_settlement_item_task,
  ADD COLUMN cleaner_user_id BIGINT UNSIGNED NOT NULL AFTER task_id,
  ADD CONSTRAINT fk_qipai_cleaning_settlement_items_cleaner FOREIGN KEY (cleaner_user_id)
    REFERENCES qipai_users(id),
  ADD UNIQUE KEY uq_qipai_cleaning_settlement_item_task_user (tenant_id, task_id, cleaner_user_id),
  ADD KEY idx_qipai_cleaning_settlement_items_cleaner (tenant_id, cleaner_user_id);

INSERT IGNORE INTO qipai_schema_migrations (version, name)
VALUES ('2026062627', 'm08b_cleaning_collaboration');