[Gekidou] Typings & PostMetadata structure (#5542)

* Typings & PostMetadata structure

* comment out unused code

* Remove duplicate interface

* Fix getPreferenceAsBool defaultValue

app/database/schema/server/table_schemas/post_metadata.ts

@@ -12,6 +12,5 @@ export default tableSchema({
     columns: [
         {name: 'data', type: 'string'},
         {name: 'post_id', type: 'string', isIndexed: true},
-        {name: 'type', type: 'string'},
     ],
 });

app/database/schema/server/test.ts

@@ -208,12 +208,10 @@ describe('*** Test schema for SERVER database ***', () => {
                     columns: {
                         data: {name: 'data', type: 'string'},
                         post_id: {name: 'post_id', type: 'string', isIndexed: true},
-                        type: {name: 'type', type: 'string'},
                     },
                     columnArray: [
                         {name: 'data', type: 'string'},
                         {name: 'post_id', type: 'string', isIndexed: true},
-                        {name: 'type', type: 'string'},
                     ],
                 },
                 [POST]: {