Fix database path for HF Spaces (use /tmp for writable storage)

app/database.py

@@ -6,6 +6,7 @@ Manages projects and validation history.
 import sqlite3
 import json
 import logging
+import os
 from datetime import datetime
 from pathlib import Path
 from typing import List, Dict, Optional, Any
@@ -13,12 +14,25 @@ from typing import List, Dict, Optional, Any
 logger = logging.getLogger(__name__)
 
 
+def get_database_path():
+    """Get writable database path based on environment."""
+    # Check if running on Hugging Face Spaces
+    if os.environ.get("SPACE_ID"):
+        # Use /tmp for HF Spaces (writable directory)
+        db_dir = "/tmp"
+    else:
+        # Local development - use current directory
+        db_dir = "."
+    
+    return os.path.join(db_dir, "projects.db")
+
+
 class ProjectDatabase:
     """Database manager for projects and validations."""
     
-    def __init__(self, db_path: str = "projects.db"):
+    def __init__(self, db_path: str = None):
         """Initialize database connection and create tables if needed."""
-        self.db_path = db_path
+        self.db_path = db_path or get_database_path()
         self._init_database()
     
     def _init_database(self):