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/fix_database_persistence.py

@@ -0,0 +1,46 @@
+#!/usr/bin/env python3
+"""
+Fix database persistence by switching to persistent SQLite
+"""
+
+import sys
+import os
+sys.path.insert(0, '/home/oib/windsurf/aitbc/apps/coordinator-api/src')
+
+def fix_database_persistence():
+    """Switch from in-memory to persistent SQLite database"""
+    print("=== FIXING DATABASE PERSISTENCE ===")
+    
+    database_file = "/home/oib/windsurf/aitbc/apps/coordinator-api/aitbc_coordinator.db"
+    
+    # Read current database.py
+    db_file = "/home/oib/windsurf/aitbc/apps/coordinator-api/src/app/database.py"
+    
+    with open(db_file, 'r') as f:
+        content = f.read()
+    
+    # Replace in-memory SQLite with persistent file
+    new_content = content.replace(
+        '"sqlite:///:memory:"',
+        f'"sqlite:///{database_file}"'
+    )
+    
+    # Write back the fixed content
+    with open(db_file, 'w') as f:
+        f.write(new_content)
+    
+    print(f"✅ Database switched to persistent file: {database_file}")
+    
+    # Remove existing database file if it exists
+    if os.path.exists(database_file):
+        os.remove(database_file)
+        print(f"🗑️  Removed old database file")
+    
+    return True
+
+if __name__ == "__main__":
+    if fix_database_persistence():
+        print("🎉 Database persistence fix completed!")
+    else:
+        print("❌ Database persistence fix failed!")
+        sys.exit(1)