Address final code review suggestions - add comments and named constants

Co-authored-by: MishkatIT <125080003+MishkatIT@users.noreply.github.com>

Author: Copilot

manual_update.py

@@ -67,8 +67,10 @@ def save_last_known_counts(stats):
         try:
             with open('last_known_counts.json', 'r') as f:
                 last_known = json.load(f)
-        except Exception:
-            pass
+        except (json.JSONDecodeError, IOError) as e:
+            # Log the error but continue with default structure
+            print(f"Warning: Could not load existing last_known_counts.json: {e}")
+            print("Starting with fresh data structure.")
 
     # Update with new stats
     for platform, count in stats.items():

quick_update.py

@@ -42,8 +42,10 @@ def save_last_known_counts(stats):
         try:
             with open('last_known_counts.json', 'r') as f:
                 last_known = json.load(f)
-        except Exception:
-            pass
+        except (json.JSONDecodeError, IOError) as e:
+            # Log the error but continue with default structure
+            print(f"Warning: Could not load existing last_known_counts.json: {e}")
+            print("Starting with fresh data structure.")
 
     # Update with new stats
     for platform, count in stats.items():

update_stats.py

@@ -30,6 +30,7 @@ def _load_last_known_counts(self):
                 data = json.load(f)
                 return data
         except FileNotFoundError:
+            # File doesn't exist yet, will be created on first save
             pass
         except Exception as e:
             print(f"Warning: Could not load last known counts: {e}")
@@ -181,6 +182,9 @@ def get_atcoder(self):
 
     def get_codechef(self):
         """Fetch CodeChef statistics using web scraping."""
+        # Maximum reasonable problem count to detect parsing errors
+        MAX_REASONABLE_COUNT = 10000
+        
         try:
             url = "https://www.codechef.com/users/MishkatIT"
             html = self.fetch_url(url)
@@ -204,7 +208,7 @@ def get_codechef(self):
                     if match:
                         count = int(match.group(1))
                         # Sanity check - CodeChef count should be reasonable
-                        if 0 < count < 10000:
+                        if 0 < count < MAX_REASONABLE_COUNT:
                             print(f"  Found using pattern: {pattern[:50]}...")
                             return count