title: Add element to JSON object in Postgres
body: <p>I have a text field in a database (postgres 9.2.1) with a json blob in it. It looks something similar to this except all on a single line, obviously:</p>
  
  <pre><code>{
    "keyword": {
      "checked": "1",
      "label": "Keyword"
    },
    "agency_name": {
      "checked": "0",
      "label": "Agency Name"
    }
  }
  </code></pre>
  
  <p>I need to add an element to json array so that it looks like this:</p>
  
  <pre><code>{
    "keyword": {
      "checked": "1",
      "label": "Keyword"
    },
    "something_new": {
      "checked": "1",
      "label": "Something New"
    },
    "agency_name": {
      "checked": "0",
      "label": "Agency Name"
    }
  }
  </code></pre>
  
  <p>I'm not as concerned about the placement of the new array element. It could be after agency_name. Is there an easy way to do this in postgres? </p>