diff --git a/auth/authentication.js b/auth/authentication.js
new file mode 100644
index 00000000..294e273e
--- /dev/null
+++ b/auth/authentication.js
@@ -0,0 +1,5 @@
+module.exports = {
+  isAuthenticated (req, res, next) {
+
+  },
+};
diff --git a/models/certificate.js b/models/certificate.js
index 702e8783..f8e8784d 100644
--- a/models/certificate.js
+++ b/models/certificate.js
@@ -87,5 +87,15 @@ module.exports = (sequelize, { STRING, BOOLEAN, INTEGER, TEXT, ARRAY, DECIMAL, D
       freezeTableName: true,
     }
   );
+
+  Certificate.associate = db => {
+    Certificate.belongsTo(db.User, {
+      onDelete  : 'cascade',
+      foreignKey: {
+        allowNull: true,
+      },
+    });
+  };
+
   return Certificate;
 };
diff --git a/models/claim.js b/models/claim.js
index b6a72a92..ab35576b 100644
--- a/models/claim.js
+++ b/models/claim.js
@@ -140,5 +140,14 @@ module.exports = (sequelize, { STRING, BOOLEAN, INTEGER, TEXT, ARRAY, DECIMAL, D
     }
   );
 
+  Claim.associate = db => {
+    Claim.belongsTo(db.File, {
+      onDelete  : 'cascade',
+      foreignKey: {
+        allowNull: true,
+      },
+    });
+  };
+
   return Claim;
 };
diff --git a/models/file.js b/models/file.js
index faabf142..dbe74cf4 100644
--- a/models/file.js
+++ b/models/file.js
@@ -52,6 +52,13 @@ module.exports = (sequelize, { STRING, BOOLEAN, INTEGER }) => {
 
   File.associate = db => {
     File.hasMany(db.Request);
+    File.belongsTo(db.User, {
+      onDelete  : 'cascade',
+      foreignKey: {
+        allowNull: true,
+      },
+    });
+    File.hasOne(db.Claim);
   };
 
   return File;
diff --git a/models/user.js b/models/user.js
new file mode 100644
index 00000000..d9acb6ee
--- /dev/null
+++ b/models/user.js
@@ -0,0 +1,33 @@
+module.exports = (sequelize, { STRING, BOOLEAN, INTEGER }) => {
+  const User = sequelize.define(
+        'User',
+    {
+      channelName: {
+        type     : STRING,
+        allowNull: false,
+      },
+      channelClaimId: {
+        type     : STRING,
+        allowNull: false,
+      },
+      password: {
+        type     : STRING,
+        allowNull: false,
+      },
+      email: {
+        type     : STRING,
+        allowNull: false,
+      },
+    },
+    {
+      freezeTableName: true,
+    }
+    );
+
+  User.associate = db => {
+    User.hasMany(db.File);
+    User.hasOne(db.Certificate);
+  };
+
+  return User;
+};