Add additionalData field to ColumnDef

app/models/api/db/ColumnDef.model.js

@@ -15,10 +15,24 @@ class ColumnDef extends Model {
             DatabaseId: String,
             UUID: { type: String, default: () => uuid() },
             Type: { type: String, default: 'text' }, // text, number for now
+            additionalData: { type: String, default: '{}' }
         }
     }
     
     // Static and instance methods can go here
+    data_get(key) {
+        return JSON.parse(this.additionalData ? this.additionalData : '{}')[key]
+    }
+
+    data_set(key, value) {
+        const json = JSON.parse(this.additionalData ? this.additionalData : '{}')
+        json[key] = value
+        this.additionalData = JSON.stringify(json)
+    }
+
+    data() {
+        return JSON.parse(this.additionalData ? this.additionalData : '{}')
+    }
 }
 
 module.exports = exports = ColumnDef