fix(db): skip PostgreSQL initialization on HuggingFace Spaces

HuggingFace Spaces blocks direct PostgreSQL connections (port 5432).
Detect SPACE_ID environment variable and skip connection pool initialization.

The investigation_service_selector will automatically use REST API services
instead, which work over HTTP/HTTPS (ports 80/443).

src/db/session.py

@@ -43,6 +43,17 @@ get_db = get_session
 
 async def init_database():
     """Initialize database connection pools."""
+    import os
+
+    # Skip PostgreSQL direct connection on HuggingFace Spaces
+    # HuggingFace blocks port 5432, use REST API services instead
+    is_huggingface = os.getenv("SPACE_ID") is not None or os.getenv("SPACE_AUTHOR_NAME") is not None
+
+    if is_huggingface:
+        logger.info("HuggingFace Spaces detected - skipping direct PostgreSQL connection")
+        logger.info("Using Supabase REST API services for data persistence")
+        return
+
     try:
         await connection_pool_service.initialize()
         logger.info("Database connection pools initialized")
@@ -53,7 +64,6 @@ async def init_database():
             exc_info=True
         )
         # Don't raise - allow app to start without database
-        # This is needed for HuggingFace Spaces deployment
         logger.warning("Running without database connection - some features may be limited")