diff --git a/docs/md_v2/marketplace/admin/admin.js b/docs/md_v2/marketplace/admin/admin.js
index adb31d0b..7d31a826 100644
--- a/docs/md_v2/marketplace/admin/admin.js
+++ b/docs/md_v2/marketplace/admin/admin.js
@@ -1,10 +1,38 @@
 // Admin Dashboard - Smart & Powerful
 const { API_BASE, API_ORIGIN } = (() => {
-    const { hostname, port } = window.location;
-    if ((hostname === 'localhost' || hostname === '127.0.0.1') && port === '8000') {
-        const origin = 'http://127.0.0.1:8100';
-        return { API_BASE: `${origin}/api`, API_ORIGIN: origin };
+    const cleanOrigin = (value) => value ? value.replace(/\/$/, '') : '';
+    const params = new URLSearchParams(window.location.search);
+    const overrideParam = cleanOrigin(params.get('api_origin'));
+
+    let storedOverride = '';
+    try {
+        storedOverride = cleanOrigin(localStorage.getItem('marketplace_api_origin'));
+    } catch (error) {
+        storedOverride = '';
     }
+
+    let origin = overrideParam || storedOverride;
+
+    if (overrideParam && overrideParam !== storedOverride) {
+        try {
+            localStorage.setItem('marketplace_api_origin', overrideParam);
+        } catch (error) {
+            // ignore storage errors (private mode, etc.)
+        }
+    }
+
+    const { protocol, hostname, port } = window.location;
+    const isLocalHost = ['localhost', '127.0.0.1', '0.0.0.0'].includes(hostname);
+
+    if (!origin && isLocalHost && port !== '8100') {
+        origin = `${protocol}//127.0.0.1:8100`;
+    }
+
+    if (origin) {
+        const normalized = cleanOrigin(origin);
+        return { API_BASE: `${normalized}/api`, API_ORIGIN: normalized };
+    }
+
     return { API_BASE: '/api', API_ORIGIN: '' };
 })();
 
@@ -185,7 +213,9 @@ class AdminDashboard {
     }
 
     async loadStats() {
-        const stats = await this.apiCall('/admin/stats');
+        const stats = await this.apiCall(`/admin/stats?_=${Date.now()}`, {
+            cache: 'no-store'
+        });
 
         document.getElementById('stat-apps').textContent = stats.apps.total;
         document.getElementById('stat-featured').textContent = stats.apps.featured;
@@ -196,17 +226,24 @@ class AdminDashboard {
     }
 
     async loadApps() {
-        this.data.apps = await this.apiCall('/apps?limit=100');
+        this.data.apps = await this.apiCall(`/apps?limit=100&_=${Date.now()}`, {
+            cache: 'no-store'
+        });
         this.renderAppsTable(this.data.apps);
     }
 
     async loadArticles() {
-        this.data.articles = await this.apiCall('/articles?limit=100');
+        this.data.articles = await this.apiCall(`/articles?limit=100&_=${Date.now()}`, {
+            cache: 'no-store'
+        });
         this.renderArticlesTable(this.data.articles);
     }
 
     async loadCategories() {
-        this.data.categories = await this.apiCall('/categories');
+        const cacheBuster = Date.now();
+        this.data.categories = await this.apiCall(`/categories?_=${cacheBuster}`, {
+            cache: 'no-store'
+        });
         this.renderCategoriesTable(this.data.categories);
     }
 
@@ -664,8 +701,10 @@ class AdminDashboard {
             data.description = document.getElementById('form-description').value;
             data.category = document.getElementById('form-category').value;
             data.type = document.getElementById('form-type').value;
-            data.rating = parseFloat(document.getElementById('form-rating').value);
-            data.downloads = parseInt(document.getElementById('form-downloads').value);
+            const rating = parseFloat(document.getElementById('form-rating').value);
+            const downloads = parseInt(document.getElementById('form-downloads').value, 10);
+            data.rating = Number.isFinite(rating) ? rating : 0;
+            data.downloads = Number.isFinite(downloads) ? downloads : 0;
             data.image = document.getElementById('form-image').value;
             data.website_url = document.getElementById('form-website').value;
             data.github_url = document.getElementById('form-github').value;
@@ -686,7 +725,8 @@ class AdminDashboard {
             data.slug = this.generateSlug(data.name);
             data.icon = document.getElementById('form-icon').value;
             data.description = document.getElementById('form-description').value;
-            data.order_index = parseInt(document.getElementById('form-order').value);
+            const orderIndex = parseInt(document.getElementById('form-order').value, 10);
+            data.order_index = Number.isFinite(orderIndex) ? orderIndex : 0;
         } else if (type === 'sponsors') {
             data.company_name = document.getElementById('form-name').value;
             data.logo_url = document.getElementById('form-logo-url').value;
diff --git a/docs/md_v2/marketplace/admin/index.html b/docs/md_v2/marketplace/admin/index.html
index 3691c1eb..a9b649f2 100644
--- a/docs/md_v2/marketplace/admin/index.html
+++ b/docs/md_v2/marketplace/admin/index.html
@@ -210,6 +210,6 @@
         </div>
     </div>
 
-    <script src="admin.js?v=1759327900"></script>
+    <script src="admin.js?v=1759334000"></script>
 </body>
 </html>
\ No newline at end of file
diff --git a/docs/md_v2/marketplace/backend/server.py b/docs/md_v2/marketplace/backend/server.py
index 77540020..0f177386 100644
--- a/docs/md_v2/marketplace/backend/server.py
+++ b/docs/md_v2/marketplace/backend/server.py
@@ -7,6 +7,7 @@ from typing import Optional, Dict, Any
 import json
 import hashlib
 import secrets
+import re
 from pathlib import Path
 from database import DatabaseManager
 from datetime import datetime, timedelta
@@ -58,6 +59,29 @@ def json_response(data, cache_time=3600):
         }
     )
 
+
+def to_int(value, default=0):
+    """Coerce incoming values to integers, falling back to default."""
+    if value is None:
+        return default
+    if isinstance(value, bool):
+        return int(value)
+    if isinstance(value, (int, float)):
+        return int(value)
+
+    if isinstance(value, str):
+        stripped = value.strip()
+        if not stripped:
+            return default
+
+        match = re.match(r"^-?\d+", stripped)
+        if match:
+            try:
+                return int(match.group())
+            except ValueError:
+                return default
+    return default
+
 # ============= PUBLIC ENDPOINTS =============
 
 @app.get("/api/apps")
@@ -141,6 +165,8 @@ async def get_article(slug: str):
 async def get_categories():
     """Get all categories ordered by index"""
     categories = db.get_all('categories', limit=50)
+    for category in categories:
+        category['order_index'] = to_int(category.get('order_index'), 0)
     categories.sort(key=lambda x: x.get('order_index', 0))
     return json_response(categories, cache_time=7200)
 
@@ -360,6 +386,9 @@ async def delete_article(article_id: int):
 async def create_category(category_data: Dict[str, Any]):
     """Create new category"""
     try:
+        category_data = dict(category_data)
+        category_data['order_index'] = to_int(category_data.get('order_index'), 0)
+
         cursor = db.conn.cursor()
         columns = ', '.join(category_data.keys())
         placeholders = ', '.join(['?' for _ in category_data])
@@ -374,6 +403,10 @@ async def create_category(category_data: Dict[str, Any]):
 async def update_category(cat_id: int, category_data: Dict[str, Any]):
     """Update category"""
     try:
+        category_data = dict(category_data)
+        if 'order_index' in category_data:
+            category_data['order_index'] = to_int(category_data.get('order_index'), 0)
+
         set_clause = ', '.join([f"{k} = ?" for k in category_data.keys()])
         cursor = db.conn.cursor()
         cursor.execute(f"UPDATE categories SET {set_clause} WHERE id = ?",
@@ -383,6 +416,18 @@ async def update_category(cat_id: int, category_data: Dict[str, Any]):
     except Exception as e:
         raise HTTPException(status_code=400, detail=str(e))
 
+
+@app.delete("/api/admin/categories/{cat_id}", dependencies=[Depends(verify_token)])
+async def delete_category(cat_id: int):
+    """Delete category"""
+    try:
+        cursor = db.conn.cursor()
+        cursor.execute("DELETE FROM categories WHERE id = ?", (cat_id,))
+        db.conn.commit()
+        return {"message": "Category deleted"}
+    except Exception as e:
+        raise HTTPException(status_code=400, detail=str(e))
+
 # Sponsors CRUD
 @app.post("/api/admin/sponsors", dependencies=[Depends(verify_token)])
 async def create_sponsor(sponsor_data: Dict[str, Any]):
@@ -411,6 +456,18 @@ async def update_sponsor(sponsor_id: int, sponsor_data: Dict[str, Any]):
     except Exception as e:
         raise HTTPException(status_code=400, detail=str(e))
 
+
+@app.delete("/api/admin/sponsors/{sponsor_id}", dependencies=[Depends(verify_token)])
+async def delete_sponsor(sponsor_id: int):
+    """Delete sponsor"""
+    try:
+        cursor = db.conn.cursor()
+        cursor.execute("DELETE FROM sponsors WHERE id = ?", (sponsor_id,))
+        db.conn.commit()
+        return {"message": "Sponsor deleted"}
+    except Exception as e:
+        raise HTTPException(status_code=400, detail=str(e))
+
 @app.get("/")
 async def root():
     """API info"""