diff --git a/Cargo.lock b/Cargo.lock
index 079d20e..6130519 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -792,6 +792,41 @@ dependencies = [
  "typenum",
 ]
 
+[[package]]
+name = "darling"
+version = "0.14.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7b750cb3417fd1b327431a470f388520309479ab0bf5e323505daf0290cd3850"
+dependencies = [
+ "darling_core",
+ "darling_macro",
+]
+
+[[package]]
+name = "darling_core"
+version = "0.14.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "109c1ca6e6b7f82cc233a97004ea8ed7ca123a9af07a8230878fcfda9b158bf0"
+dependencies = [
+ "fnv",
+ "ident_case",
+ "proc-macro2",
+ "quote",
+ "strsim",
+ "syn 1.0.109",
+]
+
+[[package]]
+name = "darling_macro"
+version = "0.14.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a4aab4dbc9f7611d8b55048a3a16d2d010c2c8334e46304b40ac1cc14bf3b48e"
+dependencies = [
+ "darling_core",
+ "quote",
+ "syn 1.0.109",
+]
+
 [[package]]
 name = "der"
 version = "0.7.8"
@@ -824,6 +859,37 @@ dependencies = [
  "syn 1.0.109",
 ]
 
+[[package]]
+name = "derive_builder"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "660047478bc508c0fde22c868991eec0c40a63e48d610befef466d48e2bee574"
+dependencies = [
+ "derive_builder_macro",
+]
+
+[[package]]
+name = "derive_builder_core"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9b217e6dd1011a54d12f3b920a411b5abd44b1716ecfe94f5f2f2f7b52e08ab7"
+dependencies = [
+ "darling",
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
+]
+
+[[package]]
+name = "derive_builder_macro"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7a5f77d7e20ac9153428f7ca14a88aba652adfc7a0ef0a06d654386310ef663b"
+dependencies = [
+ "derive_builder_core",
+ "syn 1.0.109",
+]
+
 [[package]]
 name = "deunicode"
 version = "1.4.2"
@@ -1472,6 +1538,12 @@ dependencies = [
  "cc",
 ]
 
+[[package]]
+name = "ident_case"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b9e0384b61958566e926dc50660321d12159025e767c18e043daf26b70104c39"
+
 [[package]]
 name = "idna"
 version = "0.4.0"
@@ -1755,6 +1827,7 @@ dependencies = [
  "anyhow",
  "axum 0.7.4",
  "barrel",
+ "derive_builder",
  "dotenvy",
  "dunce",
  "entity",
diff --git a/Cargo.toml b/Cargo.toml
index 523a659..665ed2f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -50,3 +50,4 @@ log = "0.4.20"
 env_logger = "0.11"
 serde_json = "1.0.108"
 slug = "0.1.5"
+derive_builder = "0.13.0"
diff --git a/src/admin/domain.rs b/src/admin/domain.rs
index f908211..4236adb 100644
--- a/src/admin/domain.rs
+++ b/src/admin/domain.rs
@@ -1,7 +1,9 @@
 pub use config::AdminModelConfig;
 pub use dto::AdminApp;
 pub use dto::AdminModel;
-pub use repository::{AdminRepository, RepositoryInfo, RepositoryList};
+pub use repository::{
+    AdminRepository, RepoInfo, RepositoryInfo, RepositoryInfoBuilder, RepositoryList,
+};
 
 mod auth {
 
@@ -47,6 +49,7 @@ mod dto {
 }
 
 pub mod repository {
+    use derive_builder::Builder;
     use serde::{Serialize, Serializer};
     use serde_json::Value;
     use std::vec::IntoIter;
@@ -95,8 +98,18 @@ pub mod repository {
         }
     }
 
+    /// Static initializer for RepositoryInfo.
+    pub struct RepoInfo {
+        pub name: &'static str,
+        pub lookup_key: &'static str,
+        pub display_list: &'static [&'static str],
+    }
+
+    // consider builder: https://docs.rs/derive_builder/latest/derive_builder/
+    // downside of builders as macro: no intellisense!
     // each repository has to implement a repo info.
-    #[derive(Serialize)]
+    #[derive(Serialize, Builder)]
+    #[builder(setter(into))]
     pub struct RepositoryInfo {
         name: String,
         lookup_key: String,
@@ -112,16 +125,34 @@ pub mod repository {
             }
         }
 
+        /* // self mutating builder pattern?
         pub fn display_list(mut self, display_list: &[&str]) -> RepositoryInfo {
             self.display_list = display_list.iter().map(|&e| e.to_string()).collect();
             self
         }
+        */
+    }
+
+    impl From<RepoInfo> for RepositoryInfo {
+        fn from(repo_info: RepoInfo) -> Self {
+            RepositoryInfo {
+                name: repo_info.name.to_string(),
+                lookup_key: repo_info.lookup_key.to_string(),
+                display_list: repo_info
+                    .display_list
+                    .iter()
+                    .map(|&s| s.to_string())
+                    .collect(),
+            }
+        }
     }
 
     pub trait AdminRepository: Send + Sync {
-        fn get_item(&self, id: usize) -> Option<Value>;
-
-        fn get_repo_info(&self) -> RepositoryInfo;
-        fn get_list(&self) -> RepositoryList;
+        fn info(&self) -> RepositoryInfo;
+        fn list(&self) -> RepositoryList;
+        fn get(&self, id: usize) -> Option<Value>;
+        fn create(&self, data: Value) -> Option<Value>;
+        fn update(&self, id: usize, data: Value) -> Option<Value>;
+        fn delete(&self, id: usize) -> Option<Value>;
     }
 }
diff --git a/src/admin/example.rs b/src/admin/example.rs
index 8f8236a..c8d5583 100644
--- a/src/admin/example.rs
+++ b/src/admin/example.rs
@@ -1,6 +1,6 @@
 // implementation of static repository
 
-use super::domain::{AdminModelConfig, AdminRepository, RepositoryInfo, RepositoryList};
+use super::domain::{AdminModelConfig, AdminRepository, RepoInfo, RepositoryInfo, RepositoryList};
 use super::state::AdminRegistry;
 use serde_json::{json, Value};
 
@@ -25,19 +25,38 @@ impl MyStaticRepository {
 }
 
 impl AdminRepository for MyStaticRepository {
-    fn get_item(&self, id: usize) -> Option<Value> {
+    fn get(&self, id: usize) -> Option<Value> {
         self.content.get(id).cloned()
     }
 
-    fn get_list(&self) -> RepositoryList {
+    fn list(&self) -> RepositoryList {
         RepositoryList::List {
             values: self.content.clone(),
         }
     }
 
-    fn get_repo_info(&self) -> RepositoryInfo {
-        RepositoryInfo::new("My Static Repository", "id")
-            .display_list(&["id", "name", "age", "level"])
+    fn info(&self) -> RepositoryInfo {
+        RepoInfo {
+            name: "My Static Repository",
+            lookup_key: "id",
+            display_list: &["id", "name", "level", "age"],
+        }
+        .into()
+    }
+
+    fn create(&self, data: Value) -> Option<Value> {
+        println!("I would now create: {}", data);
+        None
+    }
+
+    fn update(&self, id: usize, data: Value) -> Option<Value> {
+        println!("I would now update: {}, {}", id, data);
+        None
+    }
+
+    fn delete(&self, id: usize) -> Option<Value> {
+        println!("Would delete: {}", id);
+        None
     }
 }
 
diff --git a/src/admin/views.rs b/src/admin/views.rs
index 6dd448c..b3d97d5 100644
--- a/src/admin/views.rs
+++ b/src/admin/views.rs
@@ -109,8 +109,8 @@ pub async fn list_item_collection(
         AdminContext {
             available_apps: registry.get_apps(),
             content: model_key.to_owned(),
-            item_info: Some(repo.get_repo_info()),
-            item_list: repo.get_list(),
+            item_info: Some(repo.info()),
+            item_list: repo.list(),
             ..Default::default()
         }
     } else {