Implement smart date selection for data fetching

- Add intelligent date selection based on current time
- Before 01:00: fetch yesterday's data only (API not updated yet)
- After 01:00: try today's data first, fallback to yesterday if needed
- Improve data availability by adapting to API update patterns
- Add comprehensive logging for date selection decisions

This ensures optimal data fetching regardless of the time of day:
- Early morning (00:00-00:59): fetches yesterday (reliable)
- Rest of day (01:00-23:59): tries today first, falls back to yesterday

🤖 Generated with [Claude Code](https://claude.ai/code)

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

src/water_scraper_v3.py

@@ -407,9 +407,34 @@ class EnhancedWaterMonitorScraper:
                 return None
 
     def fetch_water_data(self) -> Optional[List[Dict]]:
-        """Fetch water levels and discharge data from API for yesterday (API has 1-day delay)"""
-        yesterday = datetime.datetime.now() - datetime.timedelta(days=1)
-        return self.fetch_water_data_for_date(yesterday)
+        """Fetch water levels and discharge data from API with smart date selection"""
+        current_time = datetime.datetime.now()
+
+        # If it's past 01:00, try today's data first, then yesterday as fallback
+        if current_time.hour >= 1:
+            logger.info("After 01:00 - trying today's data first, will fallback to yesterday if needed")
+
+            # Try today's data first
+            today_data = self.fetch_water_data_for_date(current_time)
+            if today_data and len(today_data) > 0:
+                logger.info(f"Successfully fetched {len(today_data)} data points for today")
+                return today_data
+
+            # Fallback to yesterday's data
+            logger.info("No data available for today, trying yesterday's data")
+            yesterday = current_time - datetime.timedelta(days=1)
+            yesterday_data = self.fetch_water_data_for_date(yesterday)
+            if yesterday_data and len(yesterday_data) > 0:
+                logger.info(f"Successfully fetched {len(yesterday_data)} data points for yesterday")
+                return yesterday_data
+
+            logger.warning("No data available for today or yesterday")
+            return None
+        else:
+            # Before 01:00 - only try yesterday's data (API likely hasn't updated yet)
+            logger.info("Before 01:00 - fetching yesterday's data only")
+            yesterday = current_time - datetime.timedelta(days=1)
+            return self.fetch_water_data_for_date(yesterday)
     
     def save_to_database(self, water_data: List[Dict], max_retries: int = 3) -> bool:
         """Save water measurements to database with retry logic"""