fix(): project refactoring and minor fixes

src/backend/apps/decision/services.py

@@ -12,7 +12,12 @@ from apps.conflicts.models import ExperimentConflictDomain
 from apps.conflicts.services import resolve_domain_conflict
 from apps.events.models import Decision
 from apps.events.services import decision_create
-from apps.experiments.models import Experiment, ExperimentStatus, Variant
+from apps.experiments.models import (
+    ACTIVE_STATUSES,
+    Experiment,
+    ExperimentStatus,
+    Variant,
+)
 from apps.experiments.selectors import active_experiment_for_flag
 from apps.flags.models import FeatureFlag
 from apps.flags.selectors import feature_flag_get_by_key
@@ -33,7 +38,7 @@ MAX_CONCURRENT_EXPERIMENTS = 3
 COOLDOWN_DAYS = 7
 
 
-def _hash_subject(subject_id: str, experiment_id: str, salt: str) -> float:
+def _hash_subject(subject_id: str, experiment_id: str, salt: str) -> Decimal:
     hash_input = f"{subject_id}:{experiment_id}:{salt}".encode()
     hash_bytes = hashlib.sha256(hash_input).digest()
     hash_int = int.from_bytes(hash_bytes[:8], byteorder="big")
@@ -112,6 +117,9 @@ def _check_participation_limits(
             subject_id=subject_id,
             reason="experiment_assigned",
             experiment_id__isnull=False,
+            experiment_id__in=Experiment.objects.filter(
+                status__in=ACTIVE_STATUSES,
+            ).values("pk"),
         )
         .exclude(experiment_id=experiment_pk)
         .values("experiment_id")