simplified version using subtype DAL instead of multiple. aggregate class no longer needed, but requires virtual methods for add/update

SettlementAttempt/EfSettlementAttemptDataAccess.cs

@@ -5,7 +5,7 @@ namespace BinaryDad.AggregateDal
 {
     public class EFSettlementAttemptDataAccess : ISettlementAttemptDataAccess
     {
-        public bool AddAttempt(SettlementAttempt attempt)
+        public virtual bool AddAttempt(SettlementAttempt attempt)
         {
             // 1. create attempt in SQL using entity framework
             // 2. update the "Id" property/PK of attempt upon insertion

SettlementAttempt/QuickBaseSettlementAttemptDataAccess.cs

@@ -3,10 +3,13 @@ using System;
 
 namespace BinaryDad.AggregateDal
 {
-    public class QuickBaseSettlementAttemptDataAccess : ISettlementAttemptDataAccess
+    public class QuickBaseSettlementAttemptDataAccess : EFSettlementAttemptDataAccess
     {
-        public bool AddAttempt(SettlementAttempt attempt)
+        public override bool AddAttempt(SettlementAttempt attempt)
         {
+            // save to SQL first
+            base.AddAttempt(attempt);
+
             // 1. create attempt in QuickBase ("Id" SQL PK should already be populated)
             // 2. update the "RecordId" property/PK of attempt upon insertion
             // 3. return if operation is successful
@@ -18,8 +21,5 @@ namespace BinaryDad.AggregateDal
 
             return true;
         }
-
-        // NOTE: we have no need to retrieve a record from QB, as it will come from SQL
-        public SettlementAttempt GetAttempt(int recordId) => null;
     }
 }

SettlementAttempt/SettlementAttemptDataAccess.cs

@@ -1,11 +0,0 @@
-using BinaryDad.AggregateDal.Models;
-using System.Linq;
-
-namespace BinaryDad.AggregateDal
-{
-    public class SettlementAttemptDataAccess : AggregateDataAccess<ISettlementAttemptDataAccess>, ISettlementAttemptDataAccess
-    {
-        public bool AddAttempt(SettlementAttempt attempt) => Invoke(d => d.AddAttempt(attempt));
-        public SettlementAttempt GetAttempt(int recordId) => Invoke(d => d.GetAttempt(recordId));
-    }
-}