Add configurable 30-day NewBook rate rescrape on 2/4/6/12h intervals

Intraday rescrape jobs are distributed evenly between the main nightly run
(05:20) and cover only the next 30 days — lightweight complement to the
full 720-day nightly sweep. Interval is configurable from the Newbook tab
in Settings and takes effect immediately without a container restart.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/scheduler.py

@@ -61,6 +61,53 @@ async def run_scheduled_direct_scrape():
     await loop.run_in_executor(None, run_scrape_all_direct)
 
 
+async def run_short_newbook_rescrape():
+    """Fetch next-30-day NewBook rates — lightweight complement to the full nightly run."""
+    from jobs.fetch_current_rates import run_fetch_current_rates
+    await run_fetch_current_rates(horizon_days=30)
+
+
+def _compute_rescrape_times(base_hour: int, base_minute: int, interval_hours: int) -> list:
+    """Return (hour, minute) tuples evenly spaced around the clock, excluding the base (main) run."""
+    return [
+        ((base_hour + offset) % 24, base_minute)
+        for offset in range(interval_hours, 24, interval_hours)
+    ]
+
+
+def apply_newbook_rescrape_schedule():
+    """Read config and (re)register 30-day NewBook rescrape jobs without a scheduler restart."""
+    for job in list(scheduler.get_jobs()):
+        if job.id.startswith('nb_rescrape_'):
+            scheduler.remove_job(job.id)
+
+    interval_str = get_config_value('newbook_rescrape_interval_hours', '0')
+    try:
+        interval_hours = int(interval_str or '0')
+    except ValueError:
+        interval_hours = 0
+
+    if interval_hours not in (2, 4, 6, 12):
+        logger.info("NewBook 30-day rescrape disabled")
+        return
+
+    rates_hour, rates_minute = get_sync_time('newbook_current_rates', 5, 20)
+    times = _compute_rescrape_times(rates_hour, rates_minute, interval_hours)
+
+    for i, (h, m) in enumerate(times):
+        scheduler.add_job(
+            run_short_newbook_rescrape,
+            CronTrigger(hour=h, minute=m),
+            id=f'nb_rescrape_{i}',
+            replace_existing=True,
+        )
+    logger.info(
+        f"NewBook rescrape: {len(times)} extra run(s) at {interval_hours}h intervals "
+        f"(base {rates_hour:02d}:{rates_minute:02d}): "
+        f"{[f'{h:02d}:{m:02d}' for h, m in times]}"
+    )
+
+
 async def run_scheduled_parity_check():
     from jobs.check_rate_parity import run_parity_check
     import asyncio
@@ -159,6 +206,9 @@ def start_scheduler():
     scheduler.start()
     logger.info(f"Scheduler started: booking scrape at {scrape_hour:02d}:{scrape_minute:02d}, rates fetch at {rates_hour:02d}:{rates_minute:02d}, direct scrape at 06:00, parity check at 06:45, watchdog every 30m")
 
+    # 30-day NewBook rescrape — optional intraday refresh, interval from config
+    apply_newbook_rescrape_schedule()
+
 
 def shutdown_scheduler():
     if scheduler.running: