diff --git a/decnet/web/db/sqlmodel_repo/__init__.py b/decnet/web/db/sqlmodel_repo/__init__.py
index 5563fbb7..cf1580b8 100644
--- a/decnet/web/db/sqlmodel_repo/__init__.py
+++ b/decnet/web/db/sqlmodel_repo/__init__.py
@@ -40,7 +40,6 @@ from decnet.web.db.models import (
     Campaign,
     SessionProfile,
     SmtpTarget,
-    SwarmHost,
     DeckyShard,
     FleetDecky,
     LOCAL_HOST_SENTINEL,
@@ -67,10 +66,12 @@ from decnet.web.db.sqlmodel_repo._helpers import (  # noqa: F401  (re-exported f
     _cleanup_tasks,
 )
 from decnet.web.db.sqlmodel_repo.attacker_intel import AttackerIntelMixin
+from decnet.web.db.sqlmodel_repo.swarm import SwarmMixin
 
 
 class SQLModelRepository(
     AttackerIntelMixin,
+    SwarmMixin,
     BaseRepository,
 ):
     """Concrete SQLModel/SQLAlchemy-async repository.
@@ -1775,65 +1776,6 @@ class SQLModelRepository(
 
     # ------------------------------------------------------------- swarm
 
-    async def add_swarm_host(self, data: dict[str, Any]) -> None:
-        async with self._session() as session:
-            session.add(SwarmHost(**data))
-            await session.commit()
-
-    async def get_swarm_host_by_name(self, name: str) -> Optional[dict[str, Any]]:
-        async with self._session() as session:
-            result = await session.execute(select(SwarmHost).where(SwarmHost.name == name))
-            row = result.scalar_one_or_none()
-            return row.model_dump(mode="json") if row else None
-
-    async def get_swarm_host_by_uuid(self, uuid: str) -> Optional[dict[str, Any]]:
-        async with self._session() as session:
-            result = await session.execute(select(SwarmHost).where(SwarmHost.uuid == uuid))
-            row = result.scalar_one_or_none()
-            return row.model_dump(mode="json") if row else None
-
-    async def get_swarm_host_by_fingerprint(self, fingerprint: str) -> Optional[dict[str, Any]]:
-        async with self._session() as session:
-            result = await session.execute(
-                select(SwarmHost).where(SwarmHost.client_cert_fingerprint == fingerprint)
-            )
-            row = result.scalar_one_or_none()
-            return row.model_dump(mode="json") if row else None
-
-    async def list_swarm_hosts(self, status: Optional[str] = None) -> list[dict[str, Any]]:
-        statement = select(SwarmHost).order_by(asc(SwarmHost.name))
-        if status:
-            statement = statement.where(SwarmHost.status == status)
-        async with self._session() as session:
-            result = await session.execute(statement)
-            return [r.model_dump(mode="json") for r in result.scalars().all()]
-
-    async def update_swarm_host(self, uuid: str, fields: dict[str, Any]) -> None:
-        if not fields:
-            return
-        async with self._session() as session:
-            await session.execute(
-                update(SwarmHost).where(SwarmHost.uuid == uuid).values(**fields)
-            )
-            await session.commit()
-
-    async def delete_swarm_host(self, uuid: str) -> bool:
-        async with self._session() as session:
-            # Clean up child shards first (no ON DELETE CASCADE portable across dialects).
-            await session.execute(
-                text("DELETE FROM decky_shards WHERE host_uuid = :u"), {"u": uuid}
-            )
-            result = await session.execute(
-                select(SwarmHost).where(SwarmHost.uuid == uuid)
-            )
-            host = result.scalar_one_or_none()
-            if not host:
-                await session.commit()
-                return False
-            await session.delete(host)
-            await session.commit()
-            return True
-
     async def upsert_decky_shard(self, data: dict[str, Any]) -> None:
         payload = {**data, "updated_at": datetime.now(timezone.utc)}
         if isinstance(payload.get("services"), list):
diff --git a/decnet/web/db/sqlmodel_repo/swarm.py b/decnet/web/db/sqlmodel_repo/swarm.py
new file mode 100644
index 00000000..9fea2d9d
--- /dev/null
+++ b/decnet/web/db/sqlmodel_repo/swarm.py
@@ -0,0 +1,71 @@
+"""Swarm host CRUD."""
+from __future__ import annotations
+
+from typing import Any, Optional
+
+from sqlalchemy import asc, select, text, update
+
+from decnet.web.db.models import SwarmHost
+
+
+class SwarmMixin:
+    """Mixin: composed onto ``SQLModelRepository``. Expects ``self._session()``."""
+
+    async def add_swarm_host(self, data: dict[str, Any]) -> None:
+        async with self._session() as session:
+            session.add(SwarmHost(**data))
+            await session.commit()
+
+    async def get_swarm_host_by_name(self, name: str) -> Optional[dict[str, Any]]:
+        async with self._session() as session:
+            result = await session.execute(select(SwarmHost).where(SwarmHost.name == name))
+            row = result.scalar_one_or_none()
+            return row.model_dump(mode="json") if row else None
+
+    async def get_swarm_host_by_uuid(self, uuid: str) -> Optional[dict[str, Any]]:
+        async with self._session() as session:
+            result = await session.execute(select(SwarmHost).where(SwarmHost.uuid == uuid))
+            row = result.scalar_one_or_none()
+            return row.model_dump(mode="json") if row else None
+
+    async def get_swarm_host_by_fingerprint(self, fingerprint: str) -> Optional[dict[str, Any]]:
+        async with self._session() as session:
+            result = await session.execute(
+                select(SwarmHost).where(SwarmHost.client_cert_fingerprint == fingerprint)
+            )
+            row = result.scalar_one_or_none()
+            return row.model_dump(mode="json") if row else None
+
+    async def list_swarm_hosts(self, status: Optional[str] = None) -> list[dict[str, Any]]:
+        statement = select(SwarmHost).order_by(asc(SwarmHost.name))
+        if status:
+            statement = statement.where(SwarmHost.status == status)
+        async with self._session() as session:
+            result = await session.execute(statement)
+            return [r.model_dump(mode="json") for r in result.scalars().all()]
+
+    async def update_swarm_host(self, uuid: str, fields: dict[str, Any]) -> None:
+        if not fields:
+            return
+        async with self._session() as session:
+            await session.execute(
+                update(SwarmHost).where(SwarmHost.uuid == uuid).values(**fields)
+            )
+            await session.commit()
+
+    async def delete_swarm_host(self, uuid: str) -> bool:
+        async with self._session() as session:
+            # Clean up child shards first (no ON DELETE CASCADE portable across dialects).
+            await session.execute(
+                text("DELETE FROM decky_shards WHERE host_uuid = :u"), {"u": uuid}
+            )
+            result = await session.execute(
+                select(SwarmHost).where(SwarmHost.uuid == uuid)
+            )
+            host = result.scalar_one_or_none()
+            if not host:
+                await session.commit()
+                return False
+            await session.delete(host)
+            await session.commit()
+            return True