Add system alerts log with nav badge and Admin Alerts tab.

Persist job and ingestion warnings/errors for 7 days, surface a dismissible top-nav badge, treat stale OHLCV as a warning (e.g. ticker renames), and show market bar age on the ticker freshness chip.

app/routers/ingestion.py

@@ -117,12 +117,32 @@ async def fetch_symbol(
             result = await ingestion_service.fetch_and_ingest(
                 db, provider, symbol_upper, start_date, end_date
             )
-            status_map = {"complete": "ok", "partial": "ok", "no_data": "warning"}
+            # "stale" = provider returned nothing but our last bar is old
+            # (rename/delist/halt) — must not look like a successful refresh.
+            status_map = {
+                "complete": "ok",
+                "partial": "ok",
+                "no_data": "warning",
+                "stale": "warning",
+            }
             sources_out["ohlcv"] = {
                 "status": status_map.get(result.status, "error"),
                 "records": result.records_ingested,
                 "message": result.message,
+                "last_date": result.last_date.isoformat() if result.last_date else None,
             }
+            if result.status in ("stale", "no_data", "error"):
+                from app.services.system_event_service import log_event
+
+                await log_event(
+                    db,
+                    severity="warning" if result.status != "error" else "error",
+                    source="ingestion",
+                    code=f"ohlcv_{result.status}",
+                    message=result.message or f"OHLCV fetch {result.status} for {symbol_upper}",
+                    symbol=symbol_upper,
+                    dedup_key=f"ohlcv_{result.status}:{symbol_upper}",
+                )
         except Exception as exc:
             logger.error("OHLCV fetch failed for %s: %s", symbol_upper, exc)
             sources_out["ohlcv"] = {"status": "error", "records": 0, "message": str(exc)}