fix(activity-mutual): close Phase 16 KEEP-VERIFY/EXTEND — 7 defects + 1 hidden compile defect (reopenEpisode) + 1 test-fidelity; unify dual-impl to confirmActivityInterest; INV-006 fix; +7 tests (481 green)

backend/src/test/resources/schema-h2.sql

@@ -33,6 +33,29 @@ CREATE TABLE matches (
   -- 测试库若缺此约束，形如 source='liked' 的非法取值会被静默放过，只在 PostgreSQL 上炸。
   CONSTRAINT chk_match_source CHECK (source IN ('user_like', 'activity_mutual', 'matchmaker'))
 );
+
+-- Phase 16：活动互选二阶段同意表（与 V024 + V037 + V041 生产 DDL 对齐）。
+-- 此前完全缺失 → 互选相关路径零覆盖（只能写假测试）。
+-- 注意 deleted_at 必须为可空 TIMESTAMP（V037 已为生产表补该列；BaseEntity 逻辑删除依赖它）。
+CREATE TABLE activity_mutual_connection_consents (
+  id VARCHAR(36) PRIMARY KEY,
+  activity_id VARCHAR(36) NOT NULL,
+  user_a_id VARCHAR(36) NOT NULL,
+  user_b_id VARCHAR(36) NOT NULL,
+  user_a_status VARCHAR(32) NOT NULL DEFAULT 'pending',
+  user_b_status VARCHAR(32) NOT NULL DEFAULT 'pending',
+  both_confirmed_at TIMESTAMP WITH TIME ZONE,
+  expires_at TIMESTAMP WITH TIME ZONE,
+  match_id VARCHAR(36),
+  created_at TIMESTAMP WITH TIME ZONE,
+  updated_at TIMESTAMP WITH TIME ZONE,
+  deleted_at TIMESTAMP WITH TIME ZONE,
+  UNIQUE (activity_id, user_a_id, user_b_id),
+  CONSTRAINT chk_consent_status CHECK (
+    user_a_status IN ('pending', 'accepted', 'declined')
+    AND user_b_status IN ('pending', 'accepted', 'declined')
+  )
+);
 CREATE TABLE relationship_success_requests (
   id VARCHAR(36) PRIMARY KEY, match_id VARCHAR(36), initiated_by VARCHAR(36), status VARCHAR(32), confirmed_by VARCHAR(36),
   resolved_at TIMESTAMP WITH TIME ZONE, created_at TIMESTAMP WITH TIME ZONE,