custom Postgres filtering logic

PostgresMemoryStorage/PostgresMemory.cs

@@ -72,6 +72,19 @@ public Task<string> UpsertAsync(
         bool withEmbeddings = false,
         CancellationToken cancellationToken = default)
     {
+        if (filters != null)
+        {
+            foreach (MemoryFilter filter in filters)
+            {
+                if (filter is PostgresMemoryFilter extendedFilter)
+                {
+                    // use PostgresMemoryFilter filtering logic
+                }
+
+                // use MemoryFilter filtering logic
+            }
+        }
+
         throw new NotImplementedException();
     }
 
@@ -83,6 +96,19 @@ public IAsyncEnumerable<MemoryRecord> GetListAsync(
         bool withEmbeddings = false,
         CancellationToken cancellationToken = default)
     {
+        if (filters != null)
+        {
+            foreach (MemoryFilter filter in filters)
+            {
+                if (filter is PostgresMemoryFilter extendedFilter)
+                {
+                    // use PostgresMemoryFilter filtering logic
+                }
+
+                // use MemoryFilter filtering logic
+            }
+        }
+
         throw new NotImplementedException();
     }
 

PostgresMemoryStorage/PostgresMemoryFilter.cs

@@ -0,0 +1,11 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+namespace Microsoft.KernelMemory.Postgres;
+
+/// <summary>
+/// Extended filtering options available when using Postgres
+/// </summary>
+public class PostgresMemoryFilter : MemoryFilter
+{
+    // ...
+}