diff --git a/apps/api/src/services/channel_event_dossier_service.py b/apps/api/src/services/channel_event_dossier_service.py
index 75fedcd7..0c101870 100644
--- a/apps/api/src/services/channel_event_dossier_service.py
+++ b/apps/api/src/services/channel_event_dossier_service.py
@@ -84,9 +84,21 @@ async def fetch_channel_event_dossier(
 
     effective_project_id = project_id or "awoooi"
     safe_limit = max(1, min(limit, _MAX_DOSSIER_EVENTS))
+    where_clauses = ["project_id = :project_id"]
+    params: dict[str, Any] = {
+        "project_id": effective_project_id,
+        "limit": safe_limit,
+    }
+    if run_id is not None:
+        where_clauses.append("run_id = CAST(:run_id AS uuid)")
+        params["run_id"] = str(run_id)
+    if provider_event_id:
+        where_clauses.append("provider_event_id = :provider_event_id")
+        params["provider_event_id"] = provider_event_id
+
     async with get_db_context(effective_project_id) as db:
         result = await db.execute(
-            text("""
+            text(f"""
                 SELECT
                     event_id,
                     project_id,
@@ -101,18 +113,11 @@ async def fetch_channel_event_dossier(
                     provider_ts,
                     received_at
                 FROM awooop_conversation_event
-                WHERE project_id = :project_id
-                  AND (:run_id IS NULL OR run_id = :run_id)
-                  AND (:provider_event_id IS NULL OR provider_event_id = :provider_event_id)
+                WHERE {" AND ".join(where_clauses)}
                 ORDER BY received_at ASC
                 LIMIT :limit
             """),
-            {
-                "project_id": effective_project_id,
-                "run_id": run_id,
-                "provider_event_id": provider_event_id,
-                "limit": safe_limit,
-            },
+            params,
         )
         rows = [dict(row) for row in result.mappings().all()]
 
diff --git a/apps/api/tests/test_channel_event_dossier_service.py b/apps/api/tests/test_channel_event_dossier_service.py
index e98ccad3..dee22bab 100644
--- a/apps/api/tests/test_channel_event_dossier_service.py
+++ b/apps/api/tests/test_channel_event_dossier_service.py
@@ -2,7 +2,9 @@ from __future__ import annotations
 
 import pytest
 from fastapi import HTTPException
+from uuid import UUID
 
+from src.services import channel_event_dossier_service
 from src.services.channel_event_dossier_service import (
     build_dossier_event,
     fetch_channel_event_dossier,
@@ -63,3 +65,52 @@ async def test_fetch_channel_event_dossier_requires_source() -> None:
         )
 
     assert exc_info.value.status_code == 422
+
+
+@pytest.mark.asyncio
+async def test_fetch_channel_event_dossier_uses_typed_run_filter(monkeypatch) -> None:
+    captured: dict[str, object] = {}
+
+    class FakeMappings:
+        def all(self) -> list[dict[str, object]]:
+            return []
+
+    class FakeResult:
+        def mappings(self) -> FakeMappings:
+            return FakeMappings()
+
+    class FakeDb:
+        async def execute(self, statement, params):  # noqa: ANN001
+            captured["sql"] = str(statement)
+            captured["params"] = params
+            return FakeResult()
+
+    class FakeContext:
+        async def __aenter__(self) -> FakeDb:
+            return FakeDb()
+
+        async def __aexit__(self, exc_type, exc, tb) -> None:  # noqa: ANN001
+            return None
+
+    monkeypatch.setattr(
+        channel_event_dossier_service,
+        "get_db_context",
+        lambda _project_id: FakeContext(),
+    )
+
+    run_id = UUID("0a4c365f-609e-5441-bc29-4c7ebc3603b6")
+    result = await fetch_channel_event_dossier(
+        project_id="awoooi",
+        run_id=run_id,
+        provider_event_id=None,
+        limit=20,
+    )
+
+    assert result["total"] == 0
+    assert "run_id = CAST(:run_id AS uuid)" in str(captured["sql"])
+    assert ":run_id IS NULL" not in str(captured["sql"])
+    assert captured["params"] == {
+        "project_id": "awoooi",
+        "run_id": str(run_id),
+        "limit": 20,
+    }