diff --git a/src/becca/entities/abstract_becca_entity.js b/src/becca/entities/abstract_becca_entity.js
index bcebb5ee6..863d2bb6f 100644
--- a/src/becca/entities/abstract_becca_entity.js
+++ b/src/becca/entities/abstract_becca_entity.js
@@ -274,6 +274,8 @@ class AbstractBeccaEntity {
                 [this.dateModified, entityId]);
         }
 
+        console.trace("DELETE");
+
         log.info(`Marking ${entityName} ${entityId} as deleted`);
 
         this.addEntityChange(true);
@@ -291,6 +293,8 @@ class AbstractBeccaEntity {
                            WHERE ${this.constructor.primaryKeyName} = ?`,
             [this.utcDateModified, entityId]);
 
+        console.trace("DELETE");
+
         log.info(`Marking ${entityName} ${entityId} as deleted`);
 
         this.addEntityChange(true);
diff --git a/src/becca/entities/bnote.js b/src/becca/entities/bnote.js
index b009cef29..dc47ce9ca 100644
--- a/src/becca/entities/bnote.js
+++ b/src/becca/entities/bnote.js
@@ -317,6 +317,9 @@ class BNote extends AbstractBeccaEntity {
     }
 
     /**
+     * Beware that the method must not create a copy of the array, but actually returns its internal array
+     * (for performance reasons)
+     *
      * @param {string} [type] - (optional) attribute type to filter
      * @param {string} [name] - (optional) attribute name to filter
      * @returns {BAttribute[]} all note's attributes, including inherited ones
@@ -335,7 +338,6 @@ class BNote extends AbstractBeccaEntity {
             return this.__attributeCache.filter(attr => attr.name === name);
         }
         else {
-            // a bit unsafe to return the original array, but defensive copy would be costly
             return this.__attributeCache;
         }
     }
@@ -646,6 +648,9 @@ class BNote extends AbstractBeccaEntity {
     }
 
     /**
+     * Beware that the method must not create a copy of the array, but actually returns its internal array
+     * (for performance reasons)
+     *
      * @param {string|null} [type] - (optional) attribute type to filter
      * @param {string|null} [name] - (optional) attribute name to filter
      * @param {string|null} [value] - (optional) attribute value to filter
diff --git a/src/routes/api/attributes.js b/src/routes/api/attributes.js
index 2a2ac7333..978cec67a 100644
--- a/src/routes/api/attributes.js
+++ b/src/routes/api/attributes.js
@@ -116,7 +116,7 @@ function updateNoteAttributes(req) {
 
     const note = becca.getNote(noteId);
 
-    let existingAttrs = note.getOwnedAttributes();
+    let existingAttrs = note.getOwnedAttributes().slice();
 
     let position = 0;