fix(scheduler): 봇 JSON 컬럼 파싱에 safeParse 가드 추가

깨진 JSON 값 하나가 getAllBots 전체를 throw시켜 startAll(전체 봇 기동)을
막던 위험 제거. weekly_schedule_config/title_filters/default_member_ids/
auto_schedule_config/text_filters를 safeParse(fallback)로 처리.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

backend/src/plugins/scheduler.js

@@ -20,6 +20,19 @@ function isActiveMonth(bot) {
   return months.includes(monthKST());
 }
 
+/**
+ * DB JSON 컬럼 안전 파싱. 깨진 값 하나가 getAllBots 전체를 막지 않도록 fallback 반환.
+ */
+function safeParse(value, fallback = null) {
+  if (value == null) return fallback;
+  if (typeof value !== 'string') return value;
+  try {
+    return JSON.parse(value);
+  } catch {
+    return fallback;
+  }
+}
+
 /**
  * 에러 객체에서 활동 로그용 details 구성
  * - err.cause(Node fetch failed의 진짜 원인 등), err.code를 함께 포함
@@ -47,11 +60,7 @@ async function schedulerPlugin(fastify, opts) {
       'SELECT * FROM bot_youtube'
     );
     return rows.map(row => {
-      const weekly = row.weekly_schedule_config
+      const weekly = safeParse(row.weekly_schedule_config, null);
-        ? (typeof row.weekly_schedule_config === 'string'
-            ? JSON.parse(row.weekly_schedule_config)
-            : row.weekly_schedule_config)
-        : null;
 
       // weekly 모드면 시작 시각에만 트리거, 아니면 cron_interval 분 주기
       let cronExpr;
@@ -72,23 +81,11 @@ async function schedulerPlugin(fastify, opts) {
         bannerUrl: row.banner_url,
         cron: cronExpr,
         enabled: row.enabled === 1,
-        titleFilters: row.title_filters
+        titleFilters: safeParse(row.title_filters, []),
-          ? (typeof row.title_filters === 'string'
+        defaultMemberIds: safeParse(row.default_member_ids, []),
-              ? JSON.parse(row.title_filters)
-              : row.title_filters)
-          : [],
-        defaultMemberIds: row.default_member_ids
-          ? (typeof row.default_member_ids === 'string'
-              ? JSON.parse(row.default_member_ids)
-              : row.default_member_ids)
-          : [],
         extractMembersFromDesc: row.extract_members_from_desc === 1,
         extractMembersFromTitle: row.extract_members_from_title === 1,
-        autoScheduleNext: row.auto_schedule_config
+        autoScheduleNext: safeParse(row.auto_schedule_config, null),
-          ? (typeof row.auto_schedule_config === 'string'
-              ? JSON.parse(row.auto_schedule_config)
-              : row.auto_schedule_config)
-          : null,
         weeklySchedule: weekly,
       };
     });
@@ -111,11 +108,7 @@ async function schedulerPlugin(fastify, opts) {
       nitterUrl: process.env.NITTER_URL || 'http://nitter:8080',
       cron: `*/${row.cron_interval} * * * *`,
       enabled: row.enabled === 1,
-      textFilters: row.text_filters
+      textFilters: safeParse(row.text_filters, []),
-        ? (typeof row.text_filters === 'string'
-            ? JSON.parse(row.text_filters)
-            : row.text_filters)
-        : [],
       includeRetweets: row.include_retweets === 1,
       extractYoutube: row.extract_youtube === 1,
       excludeManagedChannels: row.exclude_managed_channels === 1,