diff --git a/tests/test_session.py b/tests/test_session.py
index 032f2bb38..b9e09d750 100644
--- a/tests/test_session.py
+++ b/tests/test_session.py
@@ -398,3 +398,86 @@ async def test_session_memory_rejects_both_session_and_list_input(runner_method)
         assert "manually manage conversation history" in str(exc_info.value)
 
         session.close()
+
+@pytest.mark.asyncio
+async def test_sqlite_session_unicode_content():
+    """Test that session correctly stores and retrieves unicode/non-ASCII content."""
+    with tempfile.TemporaryDirectory() as temp_dir:
+        db_path = Path(temp_dir) / "test_unicode.db"
+        session_id = "unicode_test"
+        session = SQLiteSession(session_id, db_path)
+
+        # Add unicode content to the session
+        items: list[TResponseInputItem] = [
+            {"role": "user", "content": "こんにちは"},
+            {"role": "assistant", "content": "😊👍"},
+            {"role": "user", "content": "Привет"},
+        ]
+        await session.add_items(items)
+
+        # Retrieve items and verify unicode content
+        retrieved = await session.get_items()
+        assert retrieved[0].get("content") == "こんにちは"
+        assert retrieved[1].get("content") == "😊👍"
+        assert retrieved[2].get("content") == "Привет"
+        session.close()
+
+
+@pytest.mark.asyncio
+async def test_sqlite_session_special_characters_and_sql_injection():
+    """
+    Test that session safely stores and retrieves items with special characters and SQL keywords.
+    """
+    with tempfile.TemporaryDirectory() as temp_dir:
+        db_path = Path(temp_dir) / "test_special_chars.db"
+        session_id = "special_chars_test"
+        session = SQLiteSession(session_id, db_path)
+
+        # Add items with special characters and SQL keywords
+        items: list[TResponseInputItem] = [
+            {"role": "user", "content": "O'Reilly"},
+            {"role": "assistant", "content": "DROP TABLE sessions;"},
+            {"role": "user", "content": (
+                '"SELECT * FROM users WHERE name = \"admin\";"'
+            )},
+            {"role": "assistant", "content": "Robert'); DROP TABLE students;--"},
+            {"role": "user", "content": "Normal message"},
+        ]
+        await session.add_items(items)
+        retrieved = await session.get_items()
+        assert len(retrieved) == len(items)
+        for i, item in enumerate(items):
+            assert retrieved[i].get("content") == item["content"]
+        session.close()
+
+@pytest.mark.asyncio
+async def test_sqlite_session_concurrent_access():
+    """
+    Test concurrent access to the same session to verify data integrity.
+    """
+    import concurrent.futures
+    with tempfile.TemporaryDirectory() as temp_dir:
+        db_path = Path(temp_dir) / "test_concurrent.db"
+        session_id = "concurrent_test"
+        session = SQLiteSession(session_id, db_path)
+
+        # Add initial item
+        items: list[TResponseInputItem] = [
+            {"role": "user", "content": f"Message {i}"} for i in range(10)
+        ]
+
+        # Use ThreadPoolExecutor to simulate concurrent writes
+        def add_item(item):
+            loop = asyncio.new_event_loop()
+            asyncio.set_event_loop(loop)
+            loop.run_until_complete(session.add_items([item]))
+            loop.close()
+        with concurrent.futures.ThreadPoolExecutor(max_workers=5) as executor:
+            executor.map(add_item, items)
+
+        # Retrieve all items and verify all are present
+        retrieved = await session.get_items()
+        contents = {item.get("content") for item in retrieved}
+        expected = {f"Message {i}" for i in range(10)}
+        assert contents == expected
+        session.close()