feat: switch to persistent SQLite database and improve GPU booking/release handling

- Change database from in-memory to file-based SQLite at aitbc_coordinator.db
- Add status="active" to GPU booking creation
- Allow GPU release even when not properly booked (cleanup case)
- Add error handling for missing booking attributes during refund calculation
- Fix get_gpu_reviews query to use scalars() for proper result handling

scripts/cleanup_fake_gpus.py

@@ -0,0 +1,63 @@
+#!/usr/bin/env python3
+"""
+Script to clean up fake GPU entries from the marketplace
+"""
+
+import requests
+import sys
+
+def delete_fake_gpu(gpu_id):
+    """Delete a fake GPU from the marketplace"""
+    try:
+        response = requests.delete(f"http://localhost:8000/v1/marketplace/gpu/{gpu_id}")
+        if response.status_code == 200:
+            print(f"✅ Successfully deleted fake GPU: {gpu_id}")
+            return True
+        else:
+            print(f"❌ Failed to delete {gpu_id}: {response.status_code}")
+            return False
+    except Exception as e:
+        print(f"❌ Error deleting {gpu_id}: {e}")
+        return False
+
+def main():
+    """Main cleanup function"""
+    print("=== CLEANING UP FAKE GPU OFFERS ===")
+    
+    # List of fake GPU IDs to delete
+    fake_gpus = [
+        "gpu_1bdf8e86",
+        "gpu_1b7da9e0", 
+        "gpu_9cff5bc2",
+        "gpu_ebef80a5",
+        "gpu_979b24b8",
+        "gpu_e5ab817d"
+    ]
+    
+    print(f"Found {len(fake_gpus)} fake GPUs to delete")
+    
+    deleted_count = 0
+    for gpu_id in fake_gpus:
+        if delete_fake_gpu(gpu_id):
+            deleted_count += 1
+    
+    print(f"\n🎉 Cleanup complete! Deleted {deleted_count}/{len(fake_gpus)} fake GPUs")
+    
+    # Show remaining GPUs
+    print("\n📋 Remaining GPUs in marketplace:")
+    try:
+        response = requests.get("http://localhost:8000/v1/marketplace/gpu/list")
+        if response.status_code == 200:
+            data = response.json()
+            if 'items' in data:
+                for gpu in data['items']:
+                    print(f"  🎮 {gpu['id']}: {gpu['model']} - {gpu['status']}")
+            else:
+                print("  No GPUs found")
+        else:
+            print(f"  Error fetching GPU list: {response.status_code}")
+    except Exception as e:
+        print(f"  Error: {e}")
+
+if __name__ == "__main__":
+    main()