feat(web): orchestrator events read API + SSE stream

GET /api/v1/orchestrator/events — paginated list with optional
kind=traffic|file filter. GET /api/v1/orchestrator/events/stream —
SSE: snapshot on connect, live forward of orchestrator.> bus events
mapped to 'traffic' / 'file' SSE event names.

Repo gains list_orchestrator_events(limit, offset, kind?, since_ts?),
count_orchestrator_events(kind?), and prune_orchestrator_events
(per_dst_cap=10000) for periodic worker-side trimming.

decnet/web/db/models/__init__.py

@@ -55,6 +55,7 @@ from .health import (
 )
 from .orchestrator import (
     OrchestratorEvent,
+    OrchestratorEventsResponse,
 )
 from .logs import (
     Bounty,
@@ -186,6 +187,7 @@ __all__ = [
     "HealthResponse",
     # orchestrator
     "OrchestratorEvent",
+    "OrchestratorEventsResponse",
     # logs
     "Bounty",
     "BountyResponse",

decnet/web/db/models/orchestrator.py

@@ -5,9 +5,10 @@ cleanly separable from synthetic life-injection events at query time.
 The orchestrator worker is the sole writer.
 """
 from datetime import datetime, timezone
-from typing import Optional
+from typing import Any, List, Optional
 from uuid import uuid4
 
+from pydantic import BaseModel
 from sqlalchemy import Column, Index, Text
 from sqlmodel import Field, SQLModel
 
@@ -50,3 +51,10 @@ class OrchestratorEvent(SQLModel, table=True):
     payload: str = Field(
         sa_column=Column("payload", Text, nullable=False, default="{}")
     )
+
+
+class OrchestratorEventsResponse(BaseModel):
+    total: int
+    limit: int
+    offset: int
+    data: List[dict[str, Any]]

decnet/web/db/repository.py

@@ -874,7 +874,31 @@ class BaseRepository(ABC):
         raise NotImplementedError
 
     async def list_orchestrator_events(
-        self, *, limit: int = 100, since_ts: Optional[Any] = None
+        self,
+        limit: int = 100,
+        offset: int = 0,
+        *,
+        kind: Optional[str] = None,
+        since_ts: Optional[Any] = None,
     ) -> list[dict[str, Any]]:
-        """Return recent orchestrator events newest-first."""
+        """Paginated orchestrator events newest-first.
+
+        ``kind`` filters to ``"traffic"`` | ``"file"`` (matches
+        :class:`OrchestratorEvent.kind`). ``since_ts`` is the snapshot
+        delta filter used by SSE replay; leave ``None`` for the list view.
+        """
+        raise NotImplementedError
+
+    async def count_orchestrator_events(
+        self, *, kind: Optional[str] = None,
+    ) -> int:
+        """Total orchestrator-event rows, optionally filtered by kind."""
+        raise NotImplementedError
+
+    async def prune_orchestrator_events(self, per_dst_cap: int = 10000) -> int:
+        """Trim per-``dst_decky_uuid`` rows to a cap. Returns deleted count.
+
+        Periodic prune target — keeps the orchestrator_events table from
+        unbounded growth without paying the cost on every write.
+        """
         raise NotImplementedError

decnet/web/db/sqlmodel_repo.py

@@ -2816,14 +2816,59 @@ class SQLModelRepository(BaseRepository):
 
     async def list_orchestrator_events(
         self,
-        *,
         limit: int = 100,
+        offset: int = 0,
+        *,
+        kind: Optional[str] = None,
         since_ts: Optional[datetime] = None,
     ) -> list[dict[str, Any]]:
         async with self._session() as session:
             stmt = select(OrchestratorEvent)
+            if kind is not None:
+                stmt = stmt.where(OrchestratorEvent.kind == kind)
             if since_ts is not None:
                 stmt = stmt.where(OrchestratorEvent.ts >= since_ts)
-            stmt = stmt.order_by(desc(OrchestratorEvent.ts)).limit(limit)
+            stmt = (
+                stmt.order_by(desc(OrchestratorEvent.ts))
+                .offset(offset)
+                .limit(limit)
+            )
             result = await session.execute(stmt)
             return [r.model_dump(mode="json") for r in result.scalars().all()]
+
+    async def count_orchestrator_events(
+        self, *, kind: Optional[str] = None,
+    ) -> int:
+        stmt = select(func.count()).select_from(OrchestratorEvent)
+        if kind is not None:
+            stmt = stmt.where(OrchestratorEvent.kind == kind)
+        async with self._session() as session:
+            result = await session.execute(stmt)
+            return result.scalar() or 0
+
+    async def prune_orchestrator_events(self, per_dst_cap: int = 10000) -> int:
+        """Trim per-dst rows to *per_dst_cap*, oldest-first. Returns deleted count."""
+        deleted = 0
+        async with self._session() as session:
+            dst_rows = await session.execute(
+                select(OrchestratorEvent.dst_decky_uuid).distinct()
+            )
+            for (dst,) in dst_rows.all():
+                keep = await session.execute(
+                    select(OrchestratorEvent.uuid)
+                    .where(OrchestratorEvent.dst_decky_uuid == dst)
+                    .order_by(desc(OrchestratorEvent.ts))
+                    .limit(per_dst_cap)
+                )
+                keep_uuids = [u for (u,) in keep.all()]
+                if not keep_uuids:
+                    continue
+                from sqlalchemy import delete as _delete
+                stmt = _delete(OrchestratorEvent).where(
+                    OrchestratorEvent.dst_decky_uuid == dst,
+                    OrchestratorEvent.uuid.notin_(keep_uuids),
+                )
+                res = await session.execute(stmt)
+                deleted += res.rowcount or 0
+            await session.commit()
+        return deleted

decnet/web/router/__init__.py

@@ -29,6 +29,8 @@ from .campaigns.api_list_campaigns import router as campaigns_list_router
 from .campaigns.api_get_campaign_detail import router as campaign_detail_router
 from .campaigns.api_list_campaign_identities import router as campaign_identities_router
 from .campaigns.api_events import router as campaign_events_router
+from .orchestrator.api_list_events import router as orchestrator_list_router
+from .orchestrator.api_events import router as orchestrator_events_router
 from .transcripts import transcripts_router
 from .config.api_get_config import router as config_get_router
 from .config.api_update_config import router as config_update_router
@@ -104,6 +106,8 @@ api_router.include_router(campaigns_list_router)
 api_router.include_router(campaign_detail_router)
 api_router.include_router(campaign_identities_router)
 api_router.include_router(campaign_events_router)
+api_router.include_router(orchestrator_list_router)
+api_router.include_router(orchestrator_events_router)
 
 # Observability
 api_router.include_router(stats_router)

decnet/web/router/orchestrator/api_events.py

@@ -0,0 +1,123 @@
+"""SSE stream of orchestrator events.
+
+Subscribes to ``orchestrator.>`` for the duration of the request and
+forwards each event as a Server-Sent Event. Emits a one-shot snapshot
+on connect (latest 50 rows).
+
+Mirror of :mod:`decnet.web.router.campaigns.api_events`.
+"""
+from __future__ import annotations
+
+import asyncio
+from typing import AsyncGenerator
+
+import orjson
+from fastapi import APIRouter, Depends, Request
+from fastapi.responses import StreamingResponse
+
+from decnet.bus import topics as _topics
+from decnet.bus.app import get_app_bus
+from decnet.logging import get_logger
+from decnet.telemetry import traced as _traced
+from decnet.web.dependencies import repo, require_stream_viewer
+from decnet.web.sse_limits import sse_connection_slot
+
+log = get_logger("api.orchestrator.events")
+
+router = APIRouter()
+
+_KEEPALIVE_SECS = 15.0
+_SNAPSHOT_LIMIT = 50
+
+
+def _format_sse(event_name: str, data: dict) -> str:
+    return f"event: {event_name}\ndata: {orjson.dumps(data).decode()}\n\n"
+
+
+@router.get(
+    "/orchestrator/events/stream",
+    tags=["Orchestrator"],
+    responses={
+        200: {
+            "content": {"text/event-stream": {}},
+            "description": "SSE stream of orchestrator events",
+        },
+        401: {"description": "Could not validate credentials"},
+        403: {"description": "Insufficient permissions"},
+        429: {"description": "Per-user SSE connection cap reached"},
+    },
+)
+@_traced("api.orchestrator.events")
+async def api_orchestrator_events(
+    request: Request,
+    user: dict = Depends(require_stream_viewer),
+) -> StreamingResponse:
+    snapshot = await repo.list_orchestrator_events(
+        limit=_SNAPSHOT_LIMIT, offset=0,
+    )
+
+    async def generator() -> AsyncGenerator[str, None]:
+        async with sse_connection_slot(user["uuid"]):
+            yield ": keepalive\n\n"
+            yield _format_sse("snapshot", {"events": snapshot})
+
+            bus = await get_app_bus()
+            if bus is None:
+                while not await request.is_disconnected():
+                    try:
+                        await asyncio.sleep(_KEEPALIVE_SECS)
+                    except asyncio.CancelledError:
+                        break
+                    yield ": keepalive\n\n"
+                return
+
+            sub = bus.subscribe(f"{_topics.ORCHESTRATOR}.>")
+            try:
+                async with sub:
+                    sub_iter = sub.__aiter__()
+                    while True:
+                        if await request.is_disconnected():
+                            break
+                        next_task = asyncio.ensure_future(sub_iter.__anext__())
+                        try:
+                            event = await asyncio.wait_for(
+                                next_task, timeout=_KEEPALIVE_SECS,
+                            )
+                        except asyncio.TimeoutError:
+                            next_task.cancel()
+                            yield ": keepalive\n\n"
+                            continue
+                        except StopAsyncIteration:
+                            break
+                        yield _format_sse(
+                            _sse_name_for(event.topic),
+                            {
+                                "topic": event.topic,
+                                "type": event.type,
+                                "ts": event.ts,
+                                "payload": event.payload,
+                            },
+                        )
+            except asyncio.CancelledError:
+                pass
+            except Exception:
+                log.exception("orchestrator events stream crashed")
+                yield _format_sse("error", {"message": "Stream interrupted"})
+
+    return StreamingResponse(
+        generator(),
+        media_type="text/event-stream",
+        headers={
+            "Cache-Control": "no-cache",
+            "X-Accel-Buffering": "no",
+        },
+    )
+
+
+def _sse_name_for(topic: str) -> str:
+    """``orchestrator.traffic.<uuid>`` → ``traffic``;
+    ``orchestrator.file.<uuid>`` → ``file``."""
+    parts = topic.split(".", 2)
+    if len(parts) >= 2 and parts[0] == _topics.ORCHESTRATOR:
+        return parts[1]
+    return topic

decnet/web/router/orchestrator/api_list_events.py

@@ -0,0 +1,37 @@
+"""GET /api/v1/orchestrator/events — paginated orchestrator activity.
+
+Mirrors :mod:`decnet.web.router.campaigns.api_list_campaigns`. The
+orchestrator worker is the sole writer; this surface is read-only.
+"""
+from typing import Any, Optional
+
+from fastapi import APIRouter, Depends, Query
+
+from decnet.telemetry import traced as _traced
+from decnet.web.dependencies import repo, require_viewer
+
+router = APIRouter()
+
+
+@router.get(
+    "/orchestrator/events",
+    tags=["Orchestrator"],
+    responses={
+        401: {"description": "Could not validate credentials"},
+        403: {"description": "Insufficient permissions"},
+        422: {"description": "Validation error"},
+    },
+)
+@_traced("api.list_orchestrator_events")
+async def list_orchestrator_events(
+    limit: int = Query(50, ge=1, le=1000),
+    offset: int = Query(0, ge=0, le=2147483647),
+    kind: Optional[str] = Query(None, pattern="^(traffic|file)$"),
+    user: dict = Depends(require_viewer),
+) -> dict[str, Any]:
+    """Paginated orchestrator-event list, newest first."""
+    data = await repo.list_orchestrator_events(
+        limit=limit, offset=offset, kind=kind,
+    )
+    total = await repo.count_orchestrator_events(kind=kind)
+    return {"total": total, "limit": limit, "offset": offset, "data": data}