feat(calibration): complete step 1 data inspection with data quality v1

src/web/api/v1/routers/events.py

@@ -0,0 +1,40 @@
+# src/web/api/routers/events.py
+from fastapi import APIRouter, Query
+from pathlib import Path
+from collections import deque
+
+router = APIRouter(prefix="/events", tags=["events"])
+
+
+def _tail_file(path: Path, n: int) -> list[str]:
+    if not path.exists():
+        return []
+    dq = deque(maxlen=n)
+    with path.open("r", encoding="utf-8", errors="ignore") as f:
+        for line in f:
+            dq.append(line.rstrip())
+    return list(dq)
+
+
+@router.get("")
+def events(
+    limit: int = Query(200, ge=1, le=2000),
+    kind: str = Query("trading", pattern="^(trading|errors)$"),
+):
+    logs_dir = Path("logs")
+    pattern = "trading_bot_*.log" if kind == "trading" else "errors_*.log"
+
+    files = sorted(
+        logs_dir.glob(pattern),
+        key=lambda p: p.stat().st_mtime,
+        reverse=True,
+    )
+
+    if not files:
+        return {"items": []}
+
+    lines = _tail_file(files[0], limit)
+    return {
+        "items": lines,
+        "file": files[0].name,
+    }