Fixing errors related to account and account delegation

[lassemand]

Purpose

{
  "data": null,
  "errors": [
    {
      "message": "Unknown field \"accountsMetrics\" on type \"Query\". Did you mean \"accountMetrics\", \"accountByAddress\"?",
      "locations": [
        {
          "line": 2,
          "column": 3
        }
      ]
    }
  ]
}

Changes

Modified name to be accountsMetrics for backwards compatibility
Added missing events to database structs conversion
CreatedAt is taking in an option making it not working.