Defined the Repository protocol in the app target.

App/Sources/Protocols/Repository.swift

@@ -0,0 +1,28 @@
+import SwiftData
+
+/// A protocol defining the interface for a data repository.
+///
+/// This protocol abstracts the underlying data persistence mechanism, allowing for
+/// dependency injection and easier testing. Implementations handle the storage and
+/// retrieval of model objects.
+protocol Repository {
+
+    /// Deletes a model object from the repository.
+    ///
+    /// This method removes the specified object from persistent storage. The deletion
+    /// is typically performed immediately, though the actual persistence may be deferred
+    /// until a save operation occurs depending on the implementation.
+    ///
+    /// - Parameter model: The model object to delete from the repository.
+    func delete(_ model: some PersistentModel)
+
+    /// Inserts a new model object into the repository.
+    ///
+    /// This method adds a new object to persistent storage. The object is typically
+    /// tracked immediately, though the actual persistence may be deferred until a
+    /// save operation occurs depending on the implementation.
+    ///
+    /// - Parameter model: The model object to insert into the repository.
+    func insert(_ model: some PersistentModel)
+
+}