auto-discovery toggle, auto-prune with customizable retention

tinyweb_forum/db.py

@@ -1,6 +1,7 @@
 import sqlite3
 import os
 import threading
+from datetime import datetime, timedelta
 
 FORUM_DB = "forum.db"
 
@@ -497,3 +498,28 @@ class ForumDB:
             ).fetchall()
         finally:
             self.return_db(db)
+
+    def prune_old_content(self, retention_days):
+        """Delete threads and posts older than retention_days."""
+        db = self.get_db()
+        try:
+            cutoff = (datetime.utcnow() - timedelta(days=retention_days)).strftime("%Y-%m-%dT%H:%M:%S")
+            # Delete posts in old threads
+            db.execute(
+                "DELETE FROM posts WHERE thread_id IN "
+                "(SELECT id FROM threads WHERE updated_at < ?)",
+                (cutoff,),
+            )
+            # Delete orphaned posts (thread already deleted)
+            db.execute(
+                "DELETE FROM posts WHERE thread_id NOT IN (SELECT id FROM threads)"
+            )
+            # Delete old threads
+            db.execute("DELETE FROM threads WHERE updated_at < ?", (cutoff,))
+            # Clean up orphaned upvotes
+            db.execute(
+                "DELETE FROM upvotes WHERE thread_id NOT IN (SELECT id FROM threads)"
+            )
+            db.commit()
+        finally:
+            self.return_db(db)