sampleMatch.js

{
  "Match": {
    "UUID": "ed3d51dd-a88c-4697-80f3-361fc514d844",
    "GameMode": "casual",
    "Timestamp": 1476088221,
    "Duration": 1706,
    "Stats": {
      "endGameReason": "victory",
      "game_id": "kindred",
      //"lobbyInfo": {},                    remove blank
      ////"logTime": 1476090013.223941,     remove not needed
      "losingTeam": 0,
      "matchInfo": {
        "allow_afk_replacement": false,
        "difficulty": "very_hard",
        "freeunlocks": [
          "*Fortress*",
          "*Celeste*",
          "*Catherine*",
          "*Blackfeather*",
          "*Vox*",
          "*Petal*"
        ],
        "friendlyTime": "2016-10-10T08:30:21.995376",
        "gameMode": 9,
        //////"host": "10.2.0.77",      remove
        ////"lobbyInfo": {},
        ////"lobbyInitialTimeout": 120,
        ////"lobbyMode": 0,
        ////"lobbyTimeout": 60,
        ////"numMatchablesInQueue": 22,   remove
        ////"port": 11000,                remove
        "queue": "casual",
        "rubberband_bot_difficulty": true,
        ////"sites": []
      },
      ////"storedResults": [],
      "winningTeam": 1
    },
    "Teams": [
      {
        "Players": [
          {
            "Actor": "*Glaive*",
            "Name": "Scribejewel",
            "Stats": {
              //"actorValid": true,    //remove not needed
              "afkHistory": [        // keep ? good for competitive guilds/players choosing members/friends
                0,
                0,
                0,
                0,
                0,
                0,
                0,
                0,
                0,
                1
              ],
              "afkScore": 0,
              "afkTime": 0,
              "afkTotal": 0,
              "banReason": 0,
              "completed": 87,
              "completed_ranked": 0,
             ////"connectedOnce": true,  remove not needed
              "elo": 1282,
              "elo_aral": 1217,
              "elo_earned_season_4": 0,
              "elo_earned_season_5": 0,
              "elo_ranked": 1268,
              "essence": 116,
              "farm": 56.65,
                "firstAfkTime": -1,
                //"gold": 29,             remove ? personal but could be helpful in players helping players improve
              "guildTag": "",
              ///"guildUUID": "",         remove personal info
              ///"inventoryValue": 6500,  remove personal info
              ///"isDev": 0,              remove
              ///"isOrganizer": 0,        remove
              "items": [                  //remove ? could be helpful in players helping players improve
                "Tornado Trigger",
                "Weapon3",
                "Tornado Trigger",
                "Critical",
                "Armor3",
                "Boots2"
              ],
              "karma": 15.375,          //???not sure what karma info is needed if any
              "karmaBanLevel": null,
              "karmaBanWarned": 0,
              "karmaLevel": 1,
              "karmaTempBanLevel": null,
              "l10wins": [              // keep ? good for competitive guilds/players choosing members/friends
                "1",
                "1",
                "1",
                "0",
                "1",
                "0",
                "1",
                "0",
                "0",
                "0"
              ],
              ///"last_login": "10/10/16 07:26:57",  remove personal info
              "level": 12,
              ///"levelMaxXP": 14430,                 remove not needed
              ///"levelMinXP": 10285,                 remove not needed
              ///"lifetimeGold": 15274.4990234375,    remove personal info
              "lossStreak": 0,
              "matchStats": {
                "assists": 5,
                "crystalMineCaptures": 3,
                "deaths": 10,
                "farm": 2266,
                "goldMineCaptures": 0,
                "itemGrants": {
                  "*1000_Item_HalcyonPotion*": 13,
                  "*1004_Item_SwiftShooter*": 1,
                  "*1005_Item_SixSins*": 2,
                  "*1010_Item_BlazingSalvo*": 2,
                  "*1012_Item_Sorrowblade*": 1,
                  "*1014_Item_TornadoTrigger*": 2,
                  "*1022_Item_CoatOfPlates*": 1,
                  "*1024_Item_MetalJacket*": 1,
                  "*1030_Item_SprintBoots*": 1,
                  "*1032_Item_TravelBoots*": 1,
                  "*1049_Item_TyrantsMonocle*": 1,
                  "*1065_Item_HeavySteel*": 1,
                  "*1068_Item_LuckyStrike*": 3,
                  "*1080_Item_MinionsFoot*": 2
                },
                "itemSells": {
                  "*1000_Item_HalcyonPotion*": 1
                },
                "itemUses": {
                  "*1000_Item_HalcyonPotion*": 12,
                  "*1032_Item_TravelBoots*": 1
                },
                "jungleKills": 16,
                "kills": 5,
                "krakenCaptures": 0,
                "minionKills": 48,
                "nonJungleMinionKills": 32,
                "turretCaptures": 1
              },
              "mmrBucket": 12,              //not sure what this is????
              "opal": 13,                   //not sure what this is????
              //"partyUUID": "",            remove personal info
              //"pendingGuildInvites": 0,   remove personal info
              //"pendingMessages": 0,       remove personal info
              //"pendingPartyInvites": 0,   remove personal info
              //"pendingTeamInvites": 0,    remove personal info
              "replacedWithBot": false,
              "seasonMaxSkillTier": -1,
              "seasonal_key": 0,
              "silver": 4514,
              "skillTier": -1,
              "skinKey": "Glaive_DefaultSkin",
              "team": 1,
              "teamTag": "",            //if all players same on team will replace team name
              //"timeEnteredQueue": "2016-10-10T08:28:46",   remove not needed
              //"unlocks": [                remove personal info
                //"*Hero010*",
               // "*Lance*",
               // "*Sayoc*",
                //"Skaarf_Skin_Infinity_T1",
               // "Ringo_Skin_Shogun_T1",
                //"*Glaive*",
               // "*Joule*",
               //"*Ringo*"
             // ],
              "wentAfk": false,
              "winStreak": 3,
              "winner": false,
              "wins": 51,
              //"winsToday": 2,           remove personal
              //"winsTodayExpiry": -1,    remove not needed
              "xp": 13186
            },
            "UUID": "54a0a1fa-2f64-418a-94cf-85fbe55ea758"    //hashed value not ingame uuid
          }
        ],
        "Name": "",
        "UUID": "",           //hashed value not ingame uuid
        "Stats": {
          "_afkPlayers": 0,
          "_avgElo": 1411.3333333333333,
          "_avgMatches": 981.6666666666666,
          "_goldPerSecond": 29.066442373156047,
          "_playersOnTeam": 3,
          "teamAcesEarned": 2,
          "teamGold": 49588,
          "teamHeroKills": 16,
          "teamKrakenCaptures": 0,
          "teamTurretKills": 1,
          "teamTurretsRemaining": 0,
          "teamWon": false
        }
      },

    ]
  }
}

There's a removal mentioned here, but this data does seem relevant to the match at hand. It would let us show players what they bought after the match has ended. Though it looks like it needs sanitizing, Weapon3 doesn't make much sense.

"items": [                  //remove ? could be helpful in players helping players improve
                "Tornado Trigger",
                "Weapon3",
                "Tornado Trigger",
                "Critical",
                "Armor3",
                "Boots2"
              ],

I think party UUID would be useful in the matches query and wouldn't be personal info. Would be useful if showing who was in a party for matches

Could you put timestamps for the itemGrants so we can look at the build paths?

Thanks all - I shared all these comments and am working on a new version.