diff --git a/models.py b/models.py
index 4f3b78e..ae14f19 100644
--- a/models.py
+++ b/models.py
@@ -305,4 +305,41 @@ class Document(db.Model):
     file_size = db.Column(db.Integer, nullable=True)
     
     def __repr__(self):
-        return f'<Document {self.title}>' 
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+        return f'<Document {self.title}>'
+
+# Forum-Kategorie-Modell - entspricht den Hauptknotenpunkten der Mindmap
+class ForumCategory(db.Model):
+    id = db.Column(db.Integer, primary_key=True)
+    node_id = db.Column(db.Integer, db.ForeignKey('mind_map_node.id'), nullable=False)
+    title = db.Column(db.String(200), nullable=False)
+    description = db.Column(db.Text)
+    created_at = db.Column(db.DateTime, default=datetime.utcnow)
+    is_active = db.Column(db.Boolean, default=True)
+    
+    # Beziehungen
+    node = db.relationship('MindMapNode', backref='forum_category')
+    posts = db.relationship('ForumPost', backref='category', lazy=True, cascade="all, delete-orphan")
+    
+    def __repr__(self):
+        return f'<ForumCategory {self.title}>'
+
+# Forum-Beitrag-Modell
+class ForumPost(db.Model):
+    id = db.Column(db.Integer, primary_key=True)
+    title = db.Column(db.String(200), nullable=False)
+    content = db.Column(db.Text, nullable=False)
+    created_at = db.Column(db.DateTime, default=datetime.utcnow)
+    updated_at = db.Column(db.DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+    user_id = db.Column(db.Integer, db.ForeignKey('user.id'), nullable=False)
+    category_id = db.Column(db.Integer, db.ForeignKey('forum_category.id'), nullable=False)
+    parent_id = db.Column(db.Integer, db.ForeignKey('forum_post.id'), nullable=True)
+    is_pinned = db.Column(db.Boolean, default=False)
+    is_locked = db.Column(db.Boolean, default=False)
+    view_count = db.Column(db.Integer, default=0)
+    
+    # Beziehungen
+    author = db.relationship('User', backref='forum_posts')
+    replies = db.relationship('ForumPost', backref=db.backref('parent', remote_side=[id]), lazy=True)
+    
+    def __repr__(self):
+        return f'<ForumPost {self.title}>' 
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