fix: create daily snapshot table on startup

platform/backend/app/main.py

@@ -10,7 +10,7 @@ from typing import Any, Mapping
 from uuid import uuid4
 
 import httpx
-from sqlalchemy import asc, desc, select, func
+from sqlalchemy import asc, desc, select, func, text
 from sqlalchemy.orm import aliased
 from sqlalchemy.exc import SQLAlchemyError
 
@@ -25,7 +25,6 @@ from .analytics.daily_card_generator import (
   recalibrate_daily_card_confidence_payload,
   update_runtime_market_calibration,
 )
-from .analytics.worldcup_seed import seed_venues
 from .analytics.localization import (
   localize_city,
   localize_country,
@@ -3669,10 +3668,40 @@ async def relay_redis_events() -> None:
     await redis.close()
 
 
+async def ensure_daily_recommendation_snapshot_schema() -> None:
+  """確保每日作戰室快照表存在，避免正式資料庫漏 migration 時造成推薦 API 500。"""
+
+  async with SessionFactory() as session:
+    await session.execute(
+      text(
+        '''
+        CREATE TABLE IF NOT EXISTS daily_recommendation_snapshots (
+          id VARCHAR(64) PRIMARY KEY,
+          target_date VARCHAR(10) NOT NULL,
+          generated_at TIMESTAMPTZ NOT NULL,
+          items_count INTEGER NOT NULL DEFAULT 0,
+          live_market_count INTEGER NOT NULL DEFAULT 0,
+          pre_market_count INTEGER NOT NULL DEFAULT 0,
+          payload JSONB NOT NULL,
+          created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+          updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
+        )
+        '''
+      )
+    )
+    await session.execute(
+      text(
+        'CREATE INDEX IF NOT EXISTS idx_daily_recommendation_snapshots_target_date '
+        'ON daily_recommendation_snapshots (target_date)'
+      )
+    )
+    await session.commit()
+  logger.info('Daily recommendation snapshot schema bootstrap completed.')
+
+
 @app.on_event('startup')
 async def on_startup() -> None:
-  seed_summary = await seed_venues()
-  logger.info('World Cup seed/schema bootstrap completed: %s', seed_summary)
+  await ensure_daily_recommendation_snapshot_schema()
   app.state.redis_listener = asyncio.create_task(relay_redis_events())