Fix/pylint cleanup (#8)

* Fix pylint warnings across all 24 Python files in web_server

- Add module, class, and function docstrings (C0114, C0115, C0116)
- Fix import ordering: stdlib before third-party before local (C0411)
- Replace wildcard imports with explicit named imports (W0401)
- Remove trailing whitespace and add missing final newlines (C0303, C0304)
- Replace dict() with dict literals (R1735)
- Remove unused imports and variables (W0611, W0612)
- Narrow broad Exception catches to specific exceptions (W0718)
- Replace f-string logging with lazy % formatting (W1203)
- Fix variable naming: UPPER_CASE for constants, snake_case for locals (C0103)
- Add pylint disable comments for necessary global statements (W0603)
- Fix no-else-return, simplifiable-if-expression, singleton-comparison
- Fix bad indentation in stripe.py (W0311)
- Add encoding="utf-8" to open() calls (W1514)
- Add check=True to subprocess.run() calls (W1510)
- Register Celery task modules via conf.include

* Update `package-lock.json` add peer dependencies

web_server/celery_tasks/preferences.py

@@ -1,15 +1,19 @@
+"""Scheduled task for updating user preferences based on stream viewing."""
+
+import json
+
 from celery import shared_task
 from database.database import Database
 import redis
-import json
 
-redis_url = "redis://redis:6379/1"
-r = redis.from_url(redis_url, decode_responses=True)
+REDIS_URL = "redis://redis:6379/1"
+r = redis.from_url(REDIS_URL, decode_responses=True)
 
 @shared_task
 def user_preferences():
     """
-    Updates users preferences on different stream categories based on the streams they are currently watching
+    Updates users preferences on different stream categories
+    based on the streams they are currently watching
     """
     stats = r.hget("current_viewers", "viewers")
     # If there are any current viewers
@@ -21,13 +25,19 @@ def user_preferences():
                 # For each user and stream combination
                 for stream_id in stream_ids:
                     # Retrieves category associated with stream
-                    current_category = db.fetchone("""SELECT category_id FROM streams
-                                                   WHERE user_id = ?
-                                                   """, (stream_id,))
-                    # If stream is still live then update the user_preferences table to reflect their preferences
+                    current_category = db.fetchone(
+                        """SELECT category_id FROM streams
+                           WHERE user_id = ?
+                        """, (stream_id,))
+                    # If stream is still live then update the
+                    # user_preferences table to reflect their preferences
                     if current_category:
-                        db.execute("""INSERT INTO user_preferences (user_id,category_id,favourability)
-                                    VALUES (?,?,?)
-                                    ON CONFLICT(user_id, category_id) 
-                                    DO UPDATE SET favourability = favourability + 1
-                                   """, (user_id, current_category["category_id"], 1))
+                        db.execute(
+                            """INSERT INTO user_preferences
+                               (user_id,category_id,favourability)
+                               VALUES (?,?,?)
+                               ON CONFLICT(user_id, category_id)
+                               DO UPDATE SET
+                               favourability = favourability + 1
+                            """, (user_id,
+                                  current_category["category_id"], 1))