feat: initialize rust backend with axum server, seaorm models, and project scaffolding

backend/src/models/user/user.rs

@@ -0,0 +1,37 @@
+//! User entity for authentication.
+
+use sea_orm::entity::prelude::*;
+use serde::{Deserialize, Serialize};
+
+#[derive(Clone, Debug, PartialEq, Eq, DeriveEntityModel, Serialize, Deserialize)]
+#[sea_orm(table_name = "users")]
+pub struct Model {
+    #[sea_orm(primary_key)]
+    pub id: i32,
+
+    #[sea_orm(unique)]
+    pub username: String,
+
+    #[sea_orm(column_type = "Text")]
+    pub password_hash: String,
+
+    #[sea_orm(unique)]
+    pub email: String,
+
+    pub created_at: DateTime,
+    pub updated_at: DateTime,
+}
+
+#[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
+pub enum Relation {
+    #[sea_orm(has_many = "super::session::Entity")]
+    Sessions,
+}
+
+impl Related<super::session::Entity> for Entity {
+    fn to() -> RelationDef {
+        Relation::Sessions.def()
+    }
+}
+
+impl ActiveModelBehavior for ActiveModel {}