Initial commit: VKUS vitrina MVP (frontend + backend).

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/app/analytics_store.py

@@ -0,0 +1,46 @@
+from dataclasses import dataclass, field
+from datetime import datetime, timezone
+
+from app.models import AnalyticsSummary, FeedbackRequest
+
+
+@dataclass
+class FeedbackEvent:
+    message_id: str
+    helped: bool
+    query: str
+    system: str | None
+    confidence: float
+    created_at: str
+
+
+class AnalyticsStore:
+    def __init__(self) -> None:
+        self._events: list[FeedbackEvent] = []
+
+    def record(self, request: FeedbackRequest) -> FeedbackEvent:
+        event = FeedbackEvent(
+            message_id=request.message_id,
+            helped=request.helped,
+            query=request.query,
+            system=request.system,
+            confidence=request.confidence,
+            created_at=datetime.now(timezone.utc).strftime("%Y-%m-%dT%H:%M:%S"),
+        )
+        self._events.append(event)
+        return event
+
+    def summary(self) -> AnalyticsSummary:
+        total = len(self._events)
+        helped = sum(1 for e in self._events if e.helped)
+        not_helped = total - helped
+        deflection = round((helped / total) * 100, 1) if total else 0.0
+        return AnalyticsSummary(
+            total_feedback=total,
+            helped_count=helped,
+            not_helped_count=not_helped,
+            deflection_rate=deflection,
+        )
+
+
+analytics_store = AnalyticsStore()