fix(appeal): close Phase 18 KEEP-VERIFY — 8 defects (zero-coverage appeals table + 6 fake-green tests; operator-notification FK crash; appealType CHECK; escalated dead-end; processAppeal race; soft-delete filters; hardcoded resolved; evidence contract); add AppealPhase18IntegrationTest (15); full regression 494 green

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

@@ -411,3 +411,26 @@ CREATE TABLE risk_actions (
   CONSTRAINT chk_risk_action_status CHECK (status IN ('active', 'resolved', 'expired'))
 );
 
+-- Phase 18: appeals 表（申诉）—— 此前完全缺失于测试库（只列在 EntityMigrationParityTest
+-- 的可选白名单里 = 无人测），导致申诉整条真实 DB 路径零覆盖，AppealServiceTest 只能写
+-- assertTrue(true) 假绿。对齐 V013__add_appeals_table.sql：去外键（H2 无 operators 表），
+-- 保留 chk_appeal_status / chk_appeal_type 两个白名单（「只在 PG 上炸」的必崩盲区）。
+CREATE TABLE appeals (
+  id VARCHAR(36) PRIMARY KEY,
+  user_id VARCHAR(36) NOT NULL,
+  appeal_type VARCHAR(64) NOT NULL,
+  related_action_id VARCHAR(36),
+  reason CLOB NOT NULL,
+  evidence CLOB,
+  contact_method VARCHAR(256),
+  status VARCHAR(32) NOT NULL DEFAULT 'pending',
+  decision_note CLOB,
+  reviewed_by VARCHAR(36),
+  reviewed_at TIMESTAMP WITH TIME ZONE,
+  created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW(),
+  updated_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW(),
+  deleted_at TIMESTAMP WITH TIME ZONE,
+  CONSTRAINT chk_appeal_status CHECK (status IN ('pending', 'reviewing', 'approved', 'rejected', 'escalated')),
+  CONSTRAINT chk_appeal_type CHECK (appeal_type IN ('ban_appeal', 'suspend_appeal'))
+);
+