Initial implementation of db stuffs

Got the migrations and datastructures in. Next step is building db
utility function into the db module or client module

src/db/schema.rs

@@ -0,0 +1,58 @@
+// @generated automatically by Diesel CLI.
+
+pub mod sql_types {
+    #[derive(diesel::query_builder::QueryId, Clone, diesel::sql_types::SqlType)]
+    #[diesel(postgres_type(name = "room_id"))]
+    pub struct RoomId;
+
+    #[derive(diesel::query_builder::QueryId, Clone, diesel::sql_types::SqlType)]
+    #[diesel(postgres_type(name = "user_t"))]
+    pub struct UserT;
+}
+
+diesel::table! {
+    use diesel::sql_types::*;
+    use super::sql_types::UserT;
+
+    groups (id) {
+        id -> Int4,
+        groupname -> Text,
+        role -> Nullable<Text>,
+        username -> UserT,
+    }
+}
+
+diesel::table! {
+    use diesel::sql_types::*;
+    use super::sql_types::RoomId;
+    use super::sql_types::UserT;
+
+    messages (id) {
+        id -> Int8,
+        room -> RoomId,
+        body -> Text,
+        signature -> Text,
+        client_timestamp -> Int8,
+        server_timestamp -> Int8,
+        username -> UserT,
+    }
+}
+
+diesel::table! {
+    roles (id) {
+        id -> Int4,
+        rolename -> Text,
+        groupname -> Text,
+        permission -> Text,
+    }
+}
+
+diesel::table! {
+    users (id) {
+        id -> Int4,
+        username -> Text,
+        password -> Text,
+    }
+}
+
+diesel::allow_tables_to_appear_in_same_query!(groups, messages, roles, users,);