add `/<uuid> route + backend handling

src/model/camera.rs

@@ -1,15 +1,30 @@
 use crate::Backend;
 use serde::{Deserialize, Serialize};
 use sqlx::FromRow;
+use uuid::Uuid;
 
 #[derive(FromRow, Debug, Serialize, Deserialize)]
 pub struct Camera {
     pub uuid: String,
-    pub desc: String,
+    pub desc: Option<String>,
     pub name: String,
 }
 
 impl Backend {
+    pub(crate) async fn camera_by_uuid(&self, uuid: Uuid) -> Option<Camera> {
+        let uuid = uuid.to_string();
+        match self {
+            Backend::Sqlite(db) => sqlx::query_as!(
+                Camera,
+                "SELECT uuid, desc, name FROM camera WHERE uuid = ?",
+                uuid
+            )
+            .fetch_optional(db)
+            .await
+            .unwrap(),
+        }
+    }
+
     pub(crate) async fn amount_total_cameras(&self) -> i64 {
         match self {
             Backend::Sqlite(db) => {