first commit

backend/app/routes/realtime.py

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+from __future__ import annotations
+
+from flask import Blueprint, jsonify, request
+
+from app.services.realtime import RealtimeService
+from app.utils.serialization import to_plain
+
+realtime_blueprint = Blueprint("realtime", __name__)
+service = RealtimeService()
+
+
+@realtime_blueprint.get("/realtime/snapshot")
+def realtime_snapshot():
+    return jsonify(to_plain(service.snapshot()))
+
+
+@realtime_blueprint.get("/realtime/history")
+def realtime_history():
+    range_key = request.args.get("range", "6h")
+    start = request.args.get("start")
+    end = request.args.get("end")
+    metrics = [item.strip() for item in request.args.get("metrics", "").split(",") if item.strip()]
+    try:
+        return jsonify(to_plain(service.history(range_key=range_key, start=start, end=end, metric_ids=metrics or None)))
+    except ValueError as exc:
+        return jsonify({"detail": str(exc)}), 400