Database migration, repository, controller and service

Enums/EOperationState.cs

@@ -0,0 +1,10 @@
+namespace PaperlessAI.Enums;
+
+public enum EOperationState
+{
+    Created = 0,
+    Queued = 1,
+    Started = 2,
+    Success = 3,
+    Failed = 4
+}