chore(): added async decision persistence

src/backend/apps/events/tasks.py

@@ -1,7 +1,11 @@
 import logging
 
-from apps.events.services import cleanup_expired_pending_events
+from apps.events.services import (
+    cleanup_expired_pending_events,
+    decision_create,
+)
 from config.celery import app
+from config.errors import ConflictError
 
 logger = logging.getLogger("lotty")
 
@@ -14,3 +18,35 @@ def cleanup_expired_pending_events_task(self):
         extra={"deleted": deleted},
     )
     return deleted
+
+
+@app.task(bind=True, name="events.persist_decision")
+def persist_decision_task(
+    self,
+    *,
+    decision_id: str,
+    flag_key: str,
+    subject_id: str,
+    experiment_id: str | None = None,
+    variant_id: str | None = None,
+    value: str,
+    reason: str,
+):
+    try:
+        decision_create(
+            decision_id=decision_id,
+            flag_key=flag_key,
+            subject_id=subject_id,
+            experiment_id=experiment_id,
+            variant_id=variant_id,
+            value=value,
+            reason=reason,
+        )
+    except ConflictError:
+        logger.info(
+            "decision_persist_skipped_conflict",
+            extra={"decision_id": decision_id},
+        )
+        return {"status": "conflict", "decision_id": decision_id}
+
+    return {"status": "created", "decision_id": decision_id}