feat(backend): consolidate queue logic for scheduling

backend/database/models/declinelog.py

@@ -0,0 +1,14 @@
+from dataclasses import dataclass
+from datetime import datetime, date
+from typing import Optional
+from ._base import BaseModel
+
+
+@dataclass()
+class DeclineLog(BaseModel):
+    DeclineId: int
+    MemberId: int
+    ServiceId: int
+    DeclinedAt: datetime
+    DeclineDate: date          # the service day that was declined
+    Reason: Optional[str] = None