server-ts: Port services/notes & hidden_subtree

src/becca/entities/abstract_becca_entity.ts

@@ -104,13 +104,14 @@ abstract class AbstractBeccaEntity<T extends AbstractBeccaEntity<T>> {
     /**
      * Saves entity - executes SQL, but doesn't commit the transaction on its own
      */
-    save(): this {
+    // FIXME: opts not used but called a few times, maybe should be used by derived classes or passed to beforeSaving.
+    save(opts?: {}): this {
         const constructorData = (this.constructor as unknown as ConstructorData<T>);
         const entityName = constructorData.entityName;
         const primaryKeyName = constructorData.primaryKeyName;
 
         const isNewEntity = !(this as any)[primaryKeyName];
-
+        
         this.beforeSaving();
 
         const pojo = this.getPojoToSave();