diff --git a/cogs/dev_tools.py b/cogs/dev_tools.py
new file mode 100644
index 0000000..18a3512
--- /dev/null
+++ b/cogs/dev_tools.py
@@ -0,0 +1,77 @@
+"""Dev-only tools for testing Paper Dynasty systems.
+
+This cog is only loaded when DATABASE != prod. It provides commands
+for integration testing that create and clean up synthetic test data.
+"""
+
+import logging
+
+import discord
+from discord import app_commands
+from discord.ext import commands
+
+from api_calls import db_delete
+
+logger = logging.getLogger(__name__)
+
+
+class CleanupView(discord.ui.View):
+    """Post-test buttons to clean up or keep synthetic game data."""
+
+    def __init__(
+        self, owner_id: int, game_id: int, embed: discord.Embed, timeout: float = 300.0
+    ):
+        super().__init__(timeout=timeout)
+        self.owner_id = owner_id
+        self.game_id = game_id
+        self.embed = embed
+
+    @discord.ui.button(
+        label="Clean Up Test Data", style=discord.ButtonStyle.danger, emoji="🧹"
+    )
+    async def cleanup_btn(
+        self, interaction: discord.Interaction, button: discord.ui.Button
+    ):
+        if interaction.user.id != self.owner_id:
+            return
+
+        try:
+            await db_delete("decisions/game", self.game_id)
+            await db_delete("plays/game", self.game_id)
+            await db_delete("games", self.game_id)
+            self.embed.add_field(
+                name="",
+                value=f"🧹 Test data cleaned up (game #{self.game_id} removed)",
+                inline=False,
+            )
+        except Exception as e:
+            self.embed.add_field(
+                name="",
+                value=f"❌ Cleanup failed: {e}",
+                inline=False,
+            )
+
+        self.clear_items()
+        await interaction.response.edit_message(embed=self.embed, view=self)
+        self.stop()
+
+    @discord.ui.button(
+        label="Keep Test Data", style=discord.ButtonStyle.secondary, emoji="📌"
+    )
+    async def keep_btn(
+        self, interaction: discord.Interaction, button: discord.ui.Button
+    ):
+        if interaction.user.id != self.owner_id:
+            return
+
+        self.embed.add_field(
+            name="",
+            value=f"📌 Test data kept (game #{self.game_id})",
+            inline=False,
+        )
+        self.clear_items()
+        await interaction.response.edit_message(embed=self.embed, view=self)
+        self.stop()
+
+    async def on_timeout(self):
+        self.clear_items()
diff --git a/tests/test_dev_tools.py b/tests/test_dev_tools.py
new file mode 100644
index 0000000..ec7bc4f
--- /dev/null
+++ b/tests/test_dev_tools.py
@@ -0,0 +1,81 @@
+"""Tests for the DevToolsCog /dev refractor-test command."""
+
+from unittest.mock import AsyncMock, MagicMock, patch
+
+import discord
+import pytest
+
+
+class TestCleanupView:
+    """Test the cleanup button view for the refractor integration test.
+
+    The view presents two buttons after a test run: 'Clean Up Test Data'
+    deletes the synthetic game/plays/decisions; 'Keep Test Data' dismisses
+    the buttons. Only the command invoker can press them.
+    """
+
+    @pytest.fixture
+    def owner_interaction(self):
+        """Interaction from the user who ran the command."""
+        interaction = AsyncMock(spec=discord.Interaction)
+        interaction.user = MagicMock()
+        interaction.user.id = 12345
+        interaction.response = AsyncMock()
+        return interaction
+
+    @pytest.fixture
+    def other_interaction(self):
+        """Interaction from a different user — should be rejected."""
+        interaction = AsyncMock(spec=discord.Interaction)
+        interaction.user = MagicMock()
+        interaction.user.id = 99999
+        interaction.response = AsyncMock()
+        return interaction
+
+    async def test_view_has_two_buttons(self):
+        """View should have exactly two buttons: cleanup and keep.
+
+        Must be async because discord.ui.View.__init__ calls
+        asyncio.get_running_loop() internally and requires an event loop.
+        """
+        from cogs.dev_tools import CleanupView
+
+        view = CleanupView(owner_id=12345, game_id=1, embed=discord.Embed())
+        buttons = [
+            child for child in view.children if isinstance(child, discord.ui.Button)
+        ]
+        assert len(buttons) == 2
+
+    async def test_unauthorized_user_ignored(self, other_interaction):
+        """Non-owner clicks should be silently ignored."""
+        from cogs.dev_tools import CleanupView
+
+        view = CleanupView(owner_id=12345, game_id=1, embed=discord.Embed())
+        with patch("cogs.dev_tools.db_delete", new_callable=AsyncMock) as mock_delete:
+            await view.cleanup_btn.callback(other_interaction)
+            mock_delete.assert_not_called()
+            other_interaction.response.edit_message.assert_not_called()
+
+    async def test_cleanup_calls_delete_endpoints(self, owner_interaction):
+        """Cleanup button deletes decisions, plays, then game in order."""
+        from cogs.dev_tools import CleanupView
+
+        embed = discord.Embed(description="test")
+        view = CleanupView(owner_id=12345, game_id=42, embed=embed)
+        with patch("cogs.dev_tools.db_delete", new_callable=AsyncMock) as mock_delete:
+            await view.cleanup_btn.callback(owner_interaction)
+            assert mock_delete.call_count == 3
+            # Verify correct endpoints and order
+            calls = mock_delete.call_args_list
+            assert "decisions/game" in str(calls[0])
+            assert "plays/game" in str(calls[1])
+            assert "games" in str(calls[2])
+
+    async def test_keep_removes_buttons(self, owner_interaction):
+        """Keep button removes buttons and updates embed."""
+        from cogs.dev_tools import CleanupView
+
+        embed = discord.Embed(description="test")
+        view = CleanupView(owner_id=12345, game_id=42, embed=embed)
+        await view.keep_btn.callback(owner_interaction)
+        owner_interaction.response.edit_message.assert_called_once()