diff --git a/Cargo.lock b/Cargo.lock
index 10a5e9f..95ac3e8 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1621,6 +1621,7 @@ dependencies = [
  "rust-embed",
  "sea-orm",
  "serde",
+ "serde_json",
  "sqlformat",
  "tokio",
 ]
@@ -2603,9 +2604,9 @@ dependencies = [
 
 [[package]]
 name = "serde_json"
-version = "1.0.107"
+version = "1.0.108"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6b420ce6e3d8bd882e9b243c6eed35dbc9a6110c9769e74b584e0d68d1f20c65"
+checksum = "3d1c7e3eac408d115102c4c24ad393e0821bb3a5df4d506a80f85f7a742a526b"
 dependencies = [
  "itoa",
  "ryu",
diff --git a/Cargo.toml b/Cargo.toml
index a47e1cb..425beec 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -46,3 +46,4 @@ tokio = { version = "1.32.0", features = ["full"] }
 dunce = "1.0.4"
 log = "0.4.20"
 env_logger = "0.10.1"
+serde_json = "1.0.108"
diff --git a/src/admin/mod.rs b/src/admin/mod.rs
index e025d5e..53018d6 100644
--- a/src/admin/mod.rs
+++ b/src/admin/mod.rs
@@ -10,4 +10,4 @@ pub mod views;
 pub fn routes() -> Router<AppState> {
     Router::new().route("/", get(views::index).post(views::index_action))
 }
-*/
+ */
diff --git a/src/admin/state.rs b/src/admin/state.rs
index 7d79231..8e26e90 100644
--- a/src/admin/state.rs
+++ b/src/admin/state.rs
@@ -4,16 +4,27 @@ use axum::{async_trait, response::IntoResponse};
 use axum::{routing::get, Router};
 use core::future::Future;
 use std::collections::HashMap;
+
+use serde::Serialize;
+use serde_json::Value;
 use std::sync::Arc;
 
 pub type AdminState = Arc<AdminRegistry>;
 
+#[derive(Serialize)]
+pub enum RepositoryData {}
+
+pub trait AdminRepository: Send + Sync {
+    fn get_item(&self, id: usize) -> Option<Value>;
+    fn get_list(&self) -> Value;
+}
+
 // main registry.
-#[derive(Clone)]
 pub struct AdminRegistry {
     base_path: String,
     apps: HashMap<String, internal::DataNode>,
     models: HashMap<String, internal::DataNode>,
+    repositories: HashMap<String, Box<dyn AdminRepository>>,
 }
 
 impl AdminRegistry {
@@ -22,6 +33,7 @@ impl AdminRegistry {
             base_path: base_path.to_owned(),
             apps: HashMap::new(),
             models: HashMap::new(),
+            repositories: HashMap::new(),
         }
     }