fix: sqlite conn

Summary:

Test Plan:

llama_stack/providers/inline/telemetry/meta_reference/sqlite_span_processor.py

@@ -7,6 +7,7 @@
 import json
 import os
 import sqlite3
+import threading
 from datetime import datetime
 
 from opentelemetry.sdk.trace import SpanProcessor
@@ -17,14 +18,18 @@ class SQLiteSpanProcessor(SpanProcessor):
     def __init__(self, conn_string):
         """Initialize the SQLite span processor with a connection string."""
         self.conn_string = conn_string
-        self.conn = None
+        self._local = threading.local()  # Thread-local storage for connections
         self.setup_database()
 
-    def _get_connection(self) -> sqlite3.Connection:
-        """Get the database connection."""
-        if self.conn is None:
-            self.conn = sqlite3.connect(self.conn_string, check_same_thread=False)
-        return self.conn
+    def _get_connection(self):
+        """Get a thread-local database connection."""
+        if not hasattr(self._local, "conn"):
+            try:
+                self._local.conn = sqlite3.connect(self.conn_string)
+            except Exception as e:
+                print(f"Error connecting to SQLite database: {e}")
+                raise e
+        return self._local.conn
 
     def setup_database(self):
         """Create the necessary tables if they don't exist."""
@@ -168,9 +173,14 @@ class SQLiteSpanProcessor(SpanProcessor):
 
     def shutdown(self):
         """Cleanup any resources."""
-        if self.conn:
-            self.conn.close()
-            self.conn = None
+        # We can't access other threads' connections, so we just close our own
+        if hasattr(self._local, "conn"):
+            try:
+                self._local.conn.close()
+            except Exception as e:
+                print(f"Error closing SQLite connection: {e}")
+            finally:
+                del self._local.conn
 
     def force_flush(self, timeout_millis=30000):
         """Force export of spans."""