feat: implement IP ban and rate-limiting logic in database with migration scripts

src/tasks/memory_cleanup.py

@@ -2,7 +2,10 @@
 
 """
 Memory cleanup task for Krawl honeypot.
-Periodically cleans expired bans and stale entries from ip_page_visits.
+
+NOTE: This task is no longer needed. Ban/rate-limit state has been moved from
+in-memory ip_page_visits dict to the ip_stats DB table, eliminating unbounded
+memory growth. Kept disabled for reference.
 """
 
 from logger import get_app_logger
@@ -13,8 +16,8 @@ from logger import get_app_logger
 
 TASK_CONFIG = {
     "name": "memory-cleanup",
-    "cron": "*/5 * * * *",  # Run every 5 minutes
-    "enabled": True,
+    "cron": "*/5 * * * *",
+    "enabled": False,
     "run_when_loaded": False,
 }
 
@@ -22,35 +25,4 @@ app_logger = get_app_logger()
 
 
 def main():
-    """
-    Clean up in-memory structures in the tracker.
-    Called periodically to prevent unbounded memory growth.
-    """
-    try:
-        from tracker import get_tracker
-
-        tracker = get_tracker()
-        if not tracker:
-            app_logger.warning("Tracker not initialized, skipping memory cleanup")
-            return
-
-        stats_before = tracker.get_memory_stats()
-
-        tracker.cleanup_memory()
-
-        stats_after = tracker.get_memory_stats()
-
-        visits_reduced = stats_before["ip_page_visits"] - stats_after["ip_page_visits"]
-
-        if visits_reduced > 0:
-            app_logger.info(
-                f"Memory cleanup: Removed {visits_reduced} stale ip_page_visits entries"
-            )
-
-        app_logger.debug(
-            f"Memory stats after cleanup: "
-            f"ip_page_visits={stats_after['ip_page_visits']}"
-        )
-
-    except Exception as e:
-        app_logger.error(f"Error during memory cleanup: {e}")
+    app_logger.debug("memory-cleanup task is disabled (ban state now in DB)")