diff --git a/tests/integration/test_agent_role_enum_naming.py b/tests/integration/test_agent_role_enum_naming.py
new file mode 100644
index 00000000..348d6756
--- /dev/null
+++ b/tests/integration/test_agent_role_enum_naming.py
@@ -0,0 +1,54 @@
+"""Wave E2: agents.role column is typed as the postgres enum named 'agentrole'.
+
+Anti-regression for the SQLAlchemy enum-naming binding. Without the
+`_PG_ENUM_NAME_OVERRIDES["Role"] = "agentrole"` entry in
+`roboco/db/tables.py`, SQLAlchemy infers the postgres type name from the
+Python class name (`Role` → `role`), producing the `operator does not
+exist: agentrole = role` regression smoke run 2 hit.
+
+This test pins the invariant — every column typed `Role`/`AgentRole`
+binds to the canonical `agentrole` postgres type.
+"""
+
+from __future__ import annotations
+
+import pytest
+from sqlalchemy import text
+from sqlalchemy.ext.asyncio import AsyncSession
+
+
+@pytest.mark.asyncio
+async def test_agents_role_uses_agentrole_type(db_session: AsyncSession) -> None:
+    """agents.role.udt_name == 'agentrole' — never 'role'."""
+    result = await db_session.execute(
+        text(
+            "SELECT udt_name FROM information_schema.columns "
+            "WHERE table_name = 'agents' AND column_name = 'role'"
+        )
+    )
+    row = result.first()
+    assert row is not None, "agents.role column missing from test DB"
+    assert row[0] == "agentrole", (
+        f"agents.role typed as {row[0]!r}, expected 'agentrole' — "
+        f"the SQLAlchemy enum binding is missing the name='agentrole' "
+        f"override in roboco/db/tables.py::_PG_ENUM_NAME_OVERRIDES"
+    )
+
+
+@pytest.mark.asyncio
+async def test_no_stray_role_enum_type_exists(db_session: AsyncSession) -> None:
+    """No postgres enum named 'role' should exist — only 'agentrole'."""
+    result = await db_session.execute(
+        text(
+            "SELECT typname FROM pg_type "
+            "WHERE typname IN ('role', 'agentrole') "
+            "ORDER BY typname"
+        )
+    )
+    typenames = [row[0] for row in result]
+    assert "agentrole" in typenames, "agentrole enum type missing"
+    assert "role" not in typenames, (
+        "stray 'role' enum type exists — Base.metadata.create_all "
+        "produced both 'role' and 'agentrole'. Check "
+        "roboco/db/tables.py::_str_enum for missing name= override."
+    )