Move all entities to their own folder.

src/database/entities/user.rs

@@ -0,0 +1,15 @@
+use serde::{Deserialize, Serialize};
+
+#[derive(Serialize, Deserialize, Debug, Clone)]
+pub struct Relationship {
+    pub id: String,
+    pub status: u8,
+}
+
+#[derive(Serialize, Deserialize, Debug, Clone)]
+pub struct User {
+    #[serde(rename = "_id")]
+    pub id: String,
+    pub username: Option<String>,
+    pub relations: Option<Vec<Relationship>>,
+}