refactor: migrate to PostgreSQL + Sequelize

server/models/file.js

@@ -0,0 +1,44 @@
+'use strict'
+
+/**
+ * File schema
+ */
+module.exports = (sequelize, DataTypes) => {
+  let fileSchema = sequelize.define('file', {
+    category: {
+      type: DataTypes.ENUM('binary', 'image'),
+      allowNull: false,
+      defaultValue: 'binary'
+    },
+    mime: {
+      type: DataTypes.STRING,
+      allowNull: false,
+      defaultValue: 'application/octet-stream'
+    },
+    extra: {
+      type: DataTypes.JSONB,
+      allowNull: true
+    },
+    filename: {
+      type: DataTypes.STRING,
+      allowNull: false
+    },
+    basename: {
+      type: DataTypes.STRING,
+      allowNull: false
+    },
+    filesize: {
+      type: DataTypes.INTEGER,
+      allowNull: false,
+      validate: {
+        isInt: true,
+        min: 0
+      }
+    }
+  }, {
+    timestamps: true,
+    version: true
+  })
+
+  return fileSchema
+}