reorg: split repo / database so settings can use db connection as well

kordophone-db/src/schema.rs

@@ -42,6 +42,13 @@ diesel::table! {
     }
 }
 
+diesel::table! {
+    settings (key) {
+        key -> Text,
+        value -> Binary,
+    }
+}
+
 diesel::joinable!(conversation_participants -> conversations (conversation_id));
 diesel::joinable!(conversation_participants -> participants (participant_id));
 diesel::allow_tables_to_appear_in_same_query!(conversations, participants, conversation_participants);