diff --git a/lib/models/author.js b/lib/models/author.js
index 8b4f74e..03f832a 100644
--- a/lib/models/author.js
+++ b/lib/models/author.js
@@ -24,12 +24,16 @@ module.exports = function (sequelize, DataTypes) {
         Author.belongsTo(models.Note, {
           foreignKey: 'noteId',
           as: 'note',
-          constraints: false
+          constraints: false,
+          onDelete: 'CASCADE',
+          hooks: true
         })
         Author.belongsTo(models.User, {
           foreignKey: 'userId',
           as: 'user',
-          constraints: false
+          constraints: false,
+          onDelete: 'CASCADE',
+          hooks: true
         })
       }
     }
diff --git a/lib/models/note.js b/lib/models/note.js
index 7b9a909..7d8e962 100644
--- a/lib/models/note.js
+++ b/lib/models/note.js
@@ -91,7 +91,9 @@ module.exports = function (sequelize, DataTypes) {
         Note.belongsTo(models.User, {
           foreignKey: 'ownerId',
           as: 'owner',
-          constraints: false
+          constraints: false,
+          onDelete: 'CASCADE',
+          hooks: true
         })
         Note.belongsTo(models.User, {
           foreignKey: 'lastchangeuserId',
diff --git a/lib/models/revision.js b/lib/models/revision.js
index 9ecd14d..8bc95cb 100644
--- a/lib/models/revision.js
+++ b/lib/models/revision.js
@@ -102,7 +102,9 @@ module.exports = function (sequelize, DataTypes) {
         Revision.belongsTo(models.Note, {
           foreignKey: 'noteId',
           as: 'note',
-          constraints: false
+          constraints: false,
+          onDelete: 'CASCADE',
+          hooks: true
         })
       },
       getNoteRevisions: function (note, callback) {