fix: tiles column should be type text not varchar

Author: pregnantboy

packages/backend/src/models/tiles/pg/table-functions.ts

@@ -4,7 +4,7 @@ export function createTable(tableId: string, columnIds: string[]) {
   return tilesClient.schema.createTable(tableId, (table) => {
     table.string('rowId').primary()
     columnIds.forEach((columnId) => {
-      table.string(columnId)
+      table.text(columnId)
     })
     table.timestamps(true, true, true)
   })