diff --git a/frontend/components/ItemViewer.vue b/frontend/components/ItemViewer.vue
new file mode 100644
index 0000000..6af8012
--- /dev/null
+++ b/frontend/components/ItemViewer.vue
@@ -0,0 +1,86 @@
+<script setup>
+const props = defineProps({
+  builds: {
+    type: Array,
+    required: true
+  }
+})
+
+const {data : items} = await useFetch(CDRAGON_BASE + "plugins/rcp-be-lol-game-data/global/default/v1/items.json")
+const itemMap = reactive(new Map())
+for(let item of items.value) {
+    itemMap.set(item.id, item)
+}
+
+</script>
+
+<template>
+    <div style="width: fit-content; height: fit-content;">
+        <div class="item-box">
+            <h2 class="item-box-title">start</h2>
+            <div style="display: flex; width: fit-content; height: fit-content; margin:auto;">
+            <div style="margin-left: 5px; margin-right: 5px;" v-for="item in builds.start" >
+            <img style="border: 1px solid var(--color-on-surface);" width="64" height="64" :alt="item.data" :src="CDRAGON_BASE + mapPath(itemMap.get(item.data).iconPath)" />
+            <h3 style="width: fit-content; margin:auto; margin-bottom: 10px;">{{ item.count }}</h3>
+            </div>
+            </div>
+        </div>
+
+        <div v-if="builds.bootsFirst > 0.5" class="item-box" style="margin-top: 10px;">
+            <div style="display:flex; justify-content: center; align-items: baseline;">
+            <h2 class="item-box-title">boots rush</h2><h5 style="margin-left: 5px;">({{ (builds.bootsFirst * 100).toFixed(2) }}%)</h5>
+            </div>
+            <div style="display: flex; width: fit-content; height: fit-content; margin:auto;">
+            <div style="margin-left: 5px; margin-right: 5px;" v-for="item in builds.boots" >
+            <img style="border: 1px solid var(--color-on-surface);" width="64" height="64" :alt="item.data" :src="CDRAGON_BASE + mapPath(itemMap.get(item.data).iconPath)" />
+            <h3 style="width: fit-content; margin:auto; margin-bottom: 10px;">{{ item.count }}</h3>
+            </div>
+            </div>
+        </div>
+
+        <div class="item-box" style="margin-top: 10px;">
+            <h2 class="item-box-title">core</h2>
+            <TreeItem style="margin:auto; width: fit-content;" :tree="builds.tree" />
+        </div>
+
+        <div v-if="builds.bootsFirst <= 0.5"  class="item-box" style="margin-top: 10px;">
+            <h2 class="item-box-title">boots</h2>
+            <div style="display: flex; width: fit-content; height: fit-content; margin:auto;">
+            <div style="margin-left: 5px; margin-right: 5px;" v-for="item in builds.boots" >
+            <img style="border: 1px solid var(--color-on-surface);" width="64" height="64" :alt="item.data" :src="CDRAGON_BASE + mapPath(itemMap.get(item.data).iconPath)" />
+            <h3 style="width: fit-content; margin:auto; margin-bottom: 10px;">{{ item.count }}</h3>
+            </div>
+            </div>
+        </div>
+
+        <div class="item-box" style="margin-top: 10px;">
+            <h2 class="item-box-title">late game</h2>
+            <div style="display: flex; width: fit-content; height: fit-content; margin:auto;">
+            <div style="margin-left: 5px; margin-right: 5px;" v-for="item in builds.lateGame.slice(0, 7)" >
+            <img class="item-img" width="64" height="64" :alt="item.data" :src="CDRAGON_BASE + mapPath(itemMap.get(item.data).iconPath)" />
+            <h3 style="width: fit-content; margin:auto; margin-bottom: 10px;">{{ item.count }}</h3>
+            </div>
+            </div>
+        </div>
+    </div>
+</template>
+
+<style>
+.item-img {
+    border: 1px solid var(--color-on-surface);
+}
+.item-box {
+    border: 1px solid var(--color-on-surface);
+    border-radius: 8px;
+
+    width: 600px;
+    height: fit-content; 
+    margin: auto;
+}
+.item-box-title {
+    font-variant: small-caps; 
+    text-align: center;
+    margin-bottom: 10px;
+}
+
+</style>
diff --git a/frontend/components/TreeItem.vue b/frontend/components/TreeItem.vue
new file mode 100644
index 0000000..4b640e1
--- /dev/null
+++ b/frontend/components/TreeItem.vue
@@ -0,0 +1,72 @@
+<script setup>
+const props = defineProps({
+  tree: {
+    type: Object,
+    required: true
+  }
+})
+
+const item = props.tree
+
+const {data : items} = await useFetch(CDRAGON_BASE + "plugins/rcp-be-lol-game-data/global/default/v1/items.json")
+const itemMap = reactive(new Map())
+for(let item of items.value) {
+    itemMap.set(item.id, item)
+}
+
+import pkg from 'svg-dom-arrows'; const { LinePath } = pkg; 
+const treeItems = ref([])
+const treeItem = ref(null)
+const start = ref(null)
+
+const arrows = []
+
+onMounted(() => {
+    if(start.value == null) return;
+    for(let dest of treeItems.value) {
+        console.log(dest)
+        const arrow = new LinePath({
+            start: {
+                element: start.value,
+                position: {
+                    top: 0.5,
+                    left: 1
+                }
+            },
+            end: {
+                element: dest.childNodes[0].childNodes[0].childNodes[0],
+                position: {
+                    top: 0.5,
+                    left: 0
+                }
+            },
+            
+            style: 'stroke:var(--color-on-surface);stroke-width:3;fill:transparent;',
+            appendTo: document.body
+        })
+        arrows.push(arrow)
+    }
+})
+onUnmounted(() => {
+    for(let arrow of arrows) {
+        document.body.removeChild(arrow.containerDiv)
+    }
+})
+
+</script>
+
+<template>
+    <div ref="treeItem" style="display: flex; align-items: center;">
+        
+        <div v-if="item.data != undefined && item.data != null" style="width: fit-content; height: fit-content;">
+        <img ref="start" class="item-img" width="64" height="64" :alt="item.data" :src="CDRAGON_BASE + mapPath(itemMap.get(item.data).iconPath)" />
+        <h3 style="width: fit-content; margin:auto; margin-bottom: 10px;">{{ item.count }}</h3>
+        </div>
+
+        <div style="margin-left: 30px;">
+            <div style="width: fit-content; height: fit-content;" :ref="(el) => { treeItems.push(el) }" v-for="child in item.children">
+            <TreeItem :tree="child" />
+            </div>
+        </div>
+    </div>
+</template>
diff --git a/frontend/package-lock.json b/frontend/package-lock.json
index 63b3745..8fc1fc0 100644
--- a/frontend/package-lock.json
+++ b/frontend/package-lock.json
@@ -9,6 +9,7 @@
       "dependencies": {
         "mongodb": "^6.10.0",
         "nuxt": "^3.14.1592",
+        "svg-dom-arrows": "^2.3.0",
         "vue": "latest",
         "vue-router": "latest"
       }
@@ -8033,6 +8034,12 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/svg-dom-arrows": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/svg-dom-arrows/-/svg-dom-arrows-2.3.0.tgz",
+      "integrity": "sha512-qli0SobsH1fpsdwxjFp0hb+38pOFFnN3c3rTBnSk8UGpw66hmfwUmGaaPG2nxjgceBA2UBptfCyEHn6KHV+/lA==",
+      "license": "MIT"
+    },
     "node_modules/svg-tags": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/svg-tags/-/svg-tags-1.0.0.tgz",
diff --git a/frontend/package.json b/frontend/package.json
index 2eb2cf9..a2eb477 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -12,6 +12,7 @@
   "dependencies": {
     "mongodb": "^6.10.0",
     "nuxt": "^3.14.1592",
+    "svg-dom-arrows": "^2.3.0",
     "vue": "latest",
     "vue-router": "latest"
   }
diff --git a/frontend/pages/champion/[id].vue b/frontend/pages/champion/[id].vue
index 42a755f..e806a04 100644
--- a/frontend/pages/champion/[id].vue
+++ b/frontend/pages/champion/[id].vue
@@ -6,9 +6,14 @@ const { data : championData } = await useFetch("/api/champion/" + championId)
 </script>
 
 <template>
-    <ChampionTitle style="margin-top: 64px; margin-left: 64px;" :champion-id="championId" :winrate="championData.winrate" :pickrate="championData.pickrate" :game-count="championData.gameCount" />
-    <!-- <RunePage style="margin-top: 64px; margin-left: 64px;" primaryStyleId="8000" secondaryStyleId="8300" :selectionIds="selections" /> -->
-    <RuneSelector style="margin-top: 20px; margin-left: 64px;" :runes="championData.runes" />
+    <div style="display: flex; width: fit-content; margin: auto;">
+    <div style="margin-top: 64px;">
+        <ChampionTitle :champion-id="championId" :winrate="championData.winrate" :pickrate="championData.pickrate" :game-count="championData.gameCount" />
+        <RuneSelector v-if="championData.gameCount > 0" style="margin-top: 20px;" :runes="championData.runes" />
+        <h2 style="margin: auto; margin-top: 20px; width: fit-content;" v-if="championData.gameCount == 0">Sorry, there is no data for this champion :(</h2>
+    </div>
+    <ItemViewer v-if="championData.gameCount > 0" style="margin-top: 64px; margin-left: 64px;" :builds="championData.builds" />
+    </div>
 </template>
 
 <style>
diff --git a/match_collector/Dockerfile b/match_collector/Dockerfile
index edfdd26..a900e03 100644
--- a/match_collector/Dockerfile
+++ b/match_collector/Dockerfile
@@ -5,4 +5,4 @@ USER node
 COPY --chown=node:node package*.json ./
 RUN npm install
 COPY --chown=node:node . .
-CMD [ "node", "index.js" ]
\ No newline at end of file
+CMD [ "node", "--import=tsx", "index.js" ]
\ No newline at end of file
diff --git a/match_collector/champion_stat.js b/match_collector/champion_stat.js
deleted file mode 100644
index c0448d9..0000000
--- a/match_collector/champion_stat.js
+++ /dev/null
@@ -1,105 +0,0 @@
-function sameArrays(array1, array2) {
-    if(array1.length != array2.length) return false;
-    for(let e of array1) {
-        if(!array2.includes(e)) return false;
-    }
-    return true;
-}
-
-async function championInfos(client, patch, championId) {
-    const database = client.db("matches");
-    const matches = database.collection(patch)
-    const allMatches = matches.find()
-    
-    let winningMatches = 0;
-    let losingMatches = 0;
-    let totalMatches = 0;
-    const runes = [];
-    for await (let match of allMatches) {
-        totalMatches += 1;
-        for(let participant of match.info.participants) {
-            if(participant.championId != championId) continue;
-            
-            if(participant.win)
-                winningMatches += 1;
-            else
-                losingMatches += 1;
-
-            const primaryStyle = participant.perks.styles[0].style
-            const secondaryStyle = participant.perks.styles[1].style
-            const selections = []
-            for(let style of participant.perks.styles) {
-                for(let perk of style.selections) {
-                    selections.push(perk.perk)
-                }
-            }
-            const gameRunes = {count:1, primaryStyle: primaryStyle, secondaryStyle: secondaryStyle, selections: selections};
-            let addRunes = true;
-            for(let rune of runes) {
-                if(rune.primaryStyle == gameRunes.primaryStyle 
-                    && rune.secondaryStyle == gameRunes.secondaryStyle
-                    && sameArrays(rune.selections, gameRunes.selections)) {
-                    rune.count++; addRunes = false; break;
-                }
-            }
-            if(addRunes) runes.push(gameRunes)
-            break;
-        }
-    }
-
-    // Filter runes to keep 3 most played
-    const maxes = [0, 0, 0] // 24, 2, 1 -> 18 > 1 -> 24, 2, 2 -> 18 > 2 -> 24, 24, 2
-    const maxRunes = [null, null, null]
-    for(let rune of runes) {
-        let maxcount = 2;
-        if(rune.count <= maxes[maxcount]) continue;
-        
-        while(maxcount > 0 && rune.count > maxes[maxcount]) {
-            maxes[maxcount] = maxes[maxcount - 1];
-            maxRunes[maxcount] = maxRunes[maxcount - 1];
-            maxcount--;
-        }
-
-        rune.pickrate = rune.count / (winningMatches + losingMatches)
-        if(rune.count <= maxes[maxcount]) maxcount++;
-        maxes[maxcount] = rune.count
-        maxRunes[maxcount] = rune
-    }
-
-    return {id: championId,
-            winrate:winningMatches / (winningMatches + losingMatches), 
-            gameCount:(winningMatches + losingMatches),
-            pickrate:(winningMatches + losingMatches)/totalMatches,
-            runes: maxRunes.filter((x) => x != null)
-            };
-}
-
-async function makeChampionStat(client, patch, championId) {
-    const championInfo = await championInfos(client, patch, championId)
-    const database = client.db("champions")
-    const collection = database.collection(patch)
-    await collection.updateOne({id: championInfo.id}, {$set: championInfo}, { upsert: true })
-}
-
-async function championList() {
-    const response = await fetch("https://raw.communitydragon.org/latest/plugins/rcp-be-lol-game-data/global/default/v1/champion-summary.json");
-    const list = await response.json()
-    return list.slice(1)
-}
-
-async function makeChampionsStats(client, patch) {
-    const list = await championList()
-    console.log("Generating stats for " + list.length + " champions")
-    let i = 0;
-    for(let champion of list) {
-        console.log("Entry " + i + "/" + list.length + " ...")
-        await makeChampionStat(client, patch, champion.id)
-        i += 1
-    }
-
-    const database = client.db("champions")
-    const collection = database.collection(patch)
-    await collection.createIndex({id:1})
-}
-
-module.exports = {makeChampionsStats}
\ No newline at end of file
diff --git a/match_collector/champion_stat.ts b/match_collector/champion_stat.ts
new file mode 100644
index 0000000..151fce8
--- /dev/null
+++ b/match_collector/champion_stat.ts
@@ -0,0 +1,226 @@
+function sameArrays(array1 : Array<any>, array2 : Array<any>) {
+    if(array1.length != array2.length) return false;
+    for(let e of array1) {
+        if(!array2.includes(e)) return false;
+    }
+    return true;
+}
+
+import { ItemTree, treeInit, treeMerge, treeCutBranches, treeSort } from "./item_tree";
+const itemDict = new Map()
+
+async function itemList() {
+    const response = await fetch("https://raw.communitydragon.org/latest/plugins/rcp-be-lol-game-data/global/default/v1/items.json")
+    const list = await response.json()
+    return list
+}
+
+type Rune = {
+    count: number
+    primaryStyle: number
+    secondaryStyle: number
+    selections: Array<number>
+    pickrate?: number
+};
+type Builds = {
+    tree: ItemTree
+    start: Array<{data: number, count: number}>
+    bootsFirst: number
+    boots: Array<{data: number, count: number}>
+    lateGame: Array<{data: number, count: number}>
+}
+
+async function championInfos(client, patch: number, championId: number) {
+    const database = client.db("matches");
+    const matches = database.collection(patch)
+    const allMatches = matches.find()
+    
+    let winningMatches = 0;
+    let losingMatches = 0;
+    let totalMatches = 0;
+    const runes : Array<Rune> = [];
+    const builds : Builds = {tree:treeInit(), start: [], bootsFirst: 0, boots: [], lateGame: []}
+    for await (let match of allMatches) {
+        totalMatches += 1;
+        let participantIndex = 0;
+        for(let participant of match.info.participants) {
+            participantIndex += 1
+            if(participant.championId != championId) continue;
+            
+            // Winrate
+            if(participant.win)
+                winningMatches += 1;
+            else
+                losingMatches += 1;
+
+            // Runes
+            const primaryStyle = participant.perks.styles[0].style
+            const secondaryStyle = participant.perks.styles[1].style
+            const selections : Array<number> = []
+            for(let style of participant.perks.styles) {
+                for(let perk of style.selections) {
+                    selections.push(perk.perk)
+                }
+            }
+            const gameRunes : Rune = {count:1, primaryStyle: primaryStyle, secondaryStyle: secondaryStyle, selections: selections};
+            let addRunes = true;
+            for(let rune of runes) {
+                if(rune.primaryStyle == gameRunes.primaryStyle 
+                    && rune.secondaryStyle == gameRunes.secondaryStyle
+                    && sameArrays(rune.selections, gameRunes.selections)) {
+                    rune.count++; addRunes = false; break;
+                }
+            }
+            if(addRunes) runes.push(gameRunes)
+            
+            // Items
+            const items : Array<number> = []
+            for(let frame of match.timeline.info.frames) {
+                for(let event of frame.events) {
+                    if(event.participantId != participantIndex) continue;
+                    if(event.type == "ITEM_UNDO") {
+                        if(items.length > 0 && items[items.length - 1] == event.beforeId) {
+                            items.pop()
+                        }
+                        continue;
+                    }
+                    if(event.type != "ITEM_PURCHASED") continue;
+
+                    let itemInfo = itemDict.get(event.itemId)
+
+                    // Handle boots differently
+                    if(itemInfo.categories.includes("Boots")){
+                        if(itemInfo.to.length == 0 || event.itemId == 3006) {
+                            // Check for bootsFirst
+                            if(items.length < 2) {
+                                builds.bootsFirst += 1
+                            }
+
+                            // Add to boots
+                            const already = builds.boots.find((x) => x.data == event.itemId)
+                            if(already == undefined) builds.boots.push({count:1, data:event.itemId})
+                            else already.count += 1
+                        }
+
+                        continue;
+                    }
+
+                    // Check if item should be included
+                    if(itemInfo.categories.includes("Consumable")) continue;
+                    if(itemInfo.categories.includes("Trinket")) continue;
+
+                    // Ignore Cull as not-first item
+                    if(event.itemId == 1083 && items.length >= 1) continue;
+
+                    // Ignore non-final items, except when first item bought
+                    if(itemInfo.to.length != 0 && items.length >= 1) continue;
+                    
+                    items.push(event.itemId)
+                }
+            }
+            
+            // Core items
+            treeMerge(builds.tree, items.slice(1, 4))
+            
+            // Start items
+            const already = builds.start.find((x) => x.data == items[0])
+            if(already == undefined) builds.start.push({count:1, data:items[0]})
+            else already.count += 1
+            
+            // Late game items
+            for(let item of items.slice(4)) {
+                const already = builds.lateGame.find((x) => x.data == item)
+                if(already == undefined) builds.lateGame.push({count:1, data:item})
+                else already.count += 1
+            }
+
+            break;
+        }
+    }
+
+    // Filter runes to keep 3 most played
+    const maxes = [0, 0, 0] // 24, 2, 1 -> 18 > 1 -> 24, 2, 2 -> 18 > 2 -> 24, 24, 2
+    const maxRunes : Array<Rune | null> = [null, null, null]
+    for(let rune of runes) {
+        let maxcount = 2;
+        if(rune.count <= maxes[maxcount]) continue;
+        
+        while(maxcount > 0 && rune.count > maxes[maxcount]) {
+            maxes[maxcount] = maxes[maxcount - 1];
+            maxRunes[maxcount] = maxRunes[maxcount - 1];
+            maxcount--;
+        }
+
+        rune.pickrate = rune.count / (winningMatches + losingMatches)
+        if(rune.count <= maxes[maxcount]) maxcount++;
+        maxes[maxcount] = rune.count
+        maxRunes[maxcount] = rune
+    }
+
+    // Cut item tree branches to keep only 4 branches every time and with percentage threshold
+    builds.tree.count = (winningMatches + losingMatches)
+    treeCutBranches(builds.tree, 4, 0.05)
+    treeSort(builds.tree)
+
+    // Cut item start, to only 4 and with percentage threshold
+    while(builds.start.length > 4) {
+        let leastUsedItem = builds.start.reduce((a, b) => Math.min(a.count, b.count) == a.count ? a : b, {data:undefined, count: +Infinity})
+        builds.start.splice(builds.start.indexOf(leastUsedItem), 1)
+    }
+    let toRemove : Array<{data: number, count:number}> = []
+    for(let item of builds.start) {
+        if((item.count/(winningMatches + losingMatches)) < 0.05) {
+            toRemove.push(item)
+        }
+    }
+    for(let tr of toRemove) {
+        builds.start.splice(builds.start.indexOf(tr), 1)
+    }
+    builds.start.sort((a, b) => b.count - a.count)
+    builds.boots.sort((a, b) => b.count - a.count)
+    builds.bootsFirst /= (winningMatches + losingMatches)
+    builds.lateGame.sort((a, b) => b.count - a.count)
+
+    return {id: championId,
+            winrate:winningMatches / (winningMatches + losingMatches), 
+            gameCount:(winningMatches + losingMatches),
+            pickrate:(winningMatches + losingMatches)/totalMatches,
+            runes: maxRunes.filter((x) => x != null),
+            builds: builds
+            };
+}
+
+async function makeChampionStat(client, patch, championId) {
+    const championInfo = await championInfos(client, patch, championId)
+    const database = client.db("champions")
+    const collection = database.collection(patch)
+    await collection.updateOne({id: championInfo.id}, {$set: championInfo}, { upsert: true })
+}
+
+async function championList() {
+    const response = await fetch("https://raw.communitydragon.org/latest/plugins/rcp-be-lol-game-data/global/default/v1/champion-summary.json");
+    const list = await response.json()
+    return list.slice(1)
+}
+
+async function makeChampionsStats(client, patch) {
+    var globalItems = await itemList()
+    for(let item of globalItems) {
+        itemDict.set(item.id, item)
+    }
+
+    const list = await championList()
+    console.log("Generating stats for " + list.length + " champions")
+    let i = 0;
+    for(let champion of list) {
+        console.log("Entry " + i + "/" + list.length + " (" + champion.name + ")...")
+        await makeChampionStat(client, patch, champion.id)
+        i += 1
+    }
+
+    const database = client.db("champions")
+    const collection = database.collection(patch)
+    await collection.createIndex({id:1})
+}
+
+export default {makeChampionsStats}
diff --git a/match_collector/index.js b/match_collector/index.ts
similarity index 67%
rename from match_collector/index.js
rename to match_collector/index.ts
index e67e830..06bb7ea 100644
--- a/match_collector/index.js
+++ b/match_collector/index.ts
@@ -2,7 +2,9 @@ const base = "https://euw1.api.riotgames.com"
 const api_key = process.env.RIOT_API_KEY
 const sleep_minutes = 3
 
-var champion_stat = require("./champion_stat")
+import { MongoClient } from 'mongodb'
+
+import champion_stat from "./champion_stat"
 
 main()
 
@@ -15,32 +17,34 @@ async function main() {
     const alreadySeenGameList = await alreadySeenGames(client, latestPatch);
     console.log("We already have " + alreadySeenGameList.length + " matches for this patch !")
     
-    const challengerLeague = await fetchChallengerLeague();
-    console.log("ChallengerLeague: got " + challengerLeague.entries.length + " entries");
+    if(process.env.RIOT_API_KEY != null && process.env.RIOT_API_KEY != undefined && process.env.RIOT_API_KEY != "") {
+        const challengerLeague = await fetchChallengerLeague();
+        console.log("ChallengerLeague: got " + challengerLeague.entries.length + " entries");
 
-    const gameList = [];
-    let i = 0;
-    for(let challenger of challengerLeague.entries) {
-        console.log("Entry " + i + "/" + challengerLeague.entries.length + " ...")
-        const puuid = await summonerPuuid(challenger.summonerId);
-        const challengerGameList = await summonerGameList(puuid, latestPatchTime);
-        for(let game of challengerGameList) {
-            if(!gameList.includes(game) && !alreadySeenGameList.includes(game)) {
-                gameList.push(game)
+        const gameList = [];
+        let i = 0;
+        for(let challenger of challengerLeague.entries) {
+            console.log("Entry " + i + "/" + challengerLeague.entries.length + " ...")
+            const puuid = await summonerPuuid(challenger.summonerId);
+            const challengerGameList = await summonerGameList(puuid, latestPatchTime);
+            for(let game of challengerGameList) {
+                if(!gameList.includes(game) && !alreadySeenGameList.includes(game)) {
+                    gameList.push(game)
+                }
             }
+            i++;
+        }
+        
+        console.log("Games: got " + gameList.length + " entries");
+        i = 0;
+        for(let game of gameList) {
+            console.log("Entry " + i + "/" + gameList.length + " ...")
+            const gameMatch = await match(game)
+            const gameTimeline = await matchTimeline(game)
+            gameMatch.timeline = gameTimeline
+            await saveMatch(client, gameMatch, latestPatch)
+            i++;
         }
-        i++;
-    }
-    
-    console.log("Games: got " + gameList.length + " entries");
-    i = 0;
-    for(let game of gameList) {
-        console.log("Entry " + i + "/" + gameList.length + " ...")
-        const gameMatch = await match(game)
-        const gameTimeline = await matchTimeline(game)
-        gameMatch.timeline = gameTimeline
-        await saveMatch(client, gameMatch, latestPatch)
-        i++;
     }
 
     console.log("Generating stats...");
@@ -50,17 +54,17 @@ async function main() {
     await client.close()
 }
 
-async function handleRateLimit(url) {
+async function handleRateLimit(url : URL) : Promise<Response> {
     let response = await fetch(url)
     if(response.status == 429) {
         await new Promise(resolve => setTimeout(resolve, sleep_minutes * 60 * 1000))
-        response = handleRateLimit(url)
+        response = await handleRateLimit(url)
     }
 
     return response
 }
 
-function handleError(response) {
+function handleError(response : Response) {
     if(!response.ok) {
         console.log("Error during fetch(" + response.url + "): STATUS " + response.status + " (" + response.statusText + ")");
         process.exit(1);
@@ -68,7 +72,6 @@ function handleError(response) {
 }
 
 async function connectToDatabase() {
-    const { MongoClient, ServerApiVersion } = require("mongodb");
     // Create a MongoClient with a MongoClientOptions object to set the Stable API version
     const client = new MongoClient(`mongodb://${process.env.MONGO_USER}:${process.env.MONGO_PASS}@mongo:27017`)
     await client.connect()
@@ -87,7 +90,7 @@ async function fetchChallengerLeague() {
     const endpoint = `/lol/league/v4/challengerleagues/by-queue/${queue}`
     const url = `${base}${endpoint}?api_key=${api_key}`
 
-    const challengerLeagueResponse = await handleRateLimit(url);
+    const challengerLeagueResponse = await handleRateLimit(new URL(url));
     
     handleError(challengerLeagueResponse)
 
@@ -99,7 +102,7 @@ async function summonerPuuid(summonerId) {
     const endpoint = `/lol/summoner/v4/summoners/${summonerId}`
     const url = `${base}${endpoint}?api_key=${api_key}`
 
-    const puuidResponse = await handleRateLimit(url);
+    const puuidResponse = await handleRateLimit(new URL(url));
     handleError(puuidResponse)
     const puuidJson = await puuidResponse.json();
 
@@ -110,7 +113,7 @@ async function summonerGameList(puuid, startTime) {
     const endpoint = `/lol/match/v5/matches/by-puuid/${puuid}/ids`;
     const url = `${base}${endpoint}?queue=420&type=ranked&startTime=${startTime}&api_key=${api_key}`
 
-    const gameListResponse = await handleRateLimit(url);
+    const gameListResponse = await handleRateLimit(new URL(url));
     handleError(gameListResponse)
     const gameList = await gameListResponse.json();
 
@@ -122,7 +125,7 @@ async function match(matchId) {
     const endpoint = `/lol/match/v5/matches/${matchId}`
     const url = `${base}${endpoint}?api_key=${api_key}`
 
-    const matchResponse = await handleRateLimit(url)
+    const matchResponse = await handleRateLimit(new URL(url))
     handleError(matchResponse)
     const match = await matchResponse.json();
 
@@ -134,7 +137,7 @@ async function matchTimeline(matchId) {
     const endpoint = `/lol/match/v5/matches/${matchId}/timeline`
     const url = `${base}${endpoint}?api_key=${api_key}`
 
-    const timelineResponse = await handleRateLimit(url)
+    const timelineResponse = await handleRateLimit(new URL(url))
     handleError(timelineResponse)
     const timeline = await timelineResponse.json();
 
diff --git a/match_collector/item_tree.ts b/match_collector/item_tree.ts
new file mode 100644
index 0000000..399bb99
--- /dev/null
+++ b/match_collector/item_tree.ts
@@ -0,0 +1,89 @@
+type ItemTree = {
+    data: any
+    count: number
+    children: Array<ItemTree>
+};
+
+function treeInit() : ItemTree {
+    return {data:undefined, count:0, children:[]}
+}
+
+
+function treeNode(data : number, count : number) : ItemTree {
+    return {data:data, count:count, children:[]}
+}
+
+/*
+* Merge a node with an item tree
+*/
+function nodeMerge(itemtree : ItemTree, node : ItemTree) {
+    const item = node.data;
+    const count = node.count;
+    let next : ItemTree | null = null;
+
+    // Try to find an existing node in this tree level with same item
+    for(let node of itemtree.children) {
+        if(node.data == item) {
+            node.count += 1;
+            next = node;
+            break;
+        }
+    }
+
+    // If not found, add item node at this level
+    if(next == null) {
+        next = treeNode(item, count)
+        itemtree.children.push(next)
+    }
+
+    return next;
+}
+
+/* 
+* Merge a full build path with an existing item tree 
+*/
+function treeMerge(itemtree : ItemTree, items : Array<number>) {
+    let current = itemtree;
+
+    for(let item of items) {
+        current = nodeMerge(current, {data: item, count:1, children:[]})
+    }
+}
+
+function treeCutBranches(itemtree : ItemTree, thresholdCount : number, thresholdPerc : number) {
+    // Remove branches that are above threshold count
+    while(itemtree.children.length > thresholdCount) {
+        let leastUsedBranch = itemtree.children.reduce((a, b) => Math.min(a.count, b.count) == a.count ? a : b, {data:undefined, count: +Infinity, children: []})
+        itemtree.children.splice(itemtree.children.indexOf(leastUsedBranch), 1)
+    }
+
+    // Remove branches that are of too low usage
+    let toRemove : Array<ItemTree> = []
+    for(let child of itemtree.children) {
+        if((child.count/itemtree.count) < thresholdPerc) {
+            toRemove.push(child)
+        }
+    }
+    for(let tr of toRemove) {
+        itemtree.children.splice(itemtree.children.indexOf(tr), 1)
+    }
+
+    itemtree.children.map((x) => treeCutBranches(x, thresholdCount, thresholdPerc))
+}
+
+function treeMergeTree(itemtree1: ItemTree, itemtree2: ItemTree) {
+    for(let child of itemtree2.children) {
+        let node = nodeMerge(itemtree1, child)
+        treeMergeTree(node, child)
+    }
+}
+
+function treeSort(itemtree: ItemTree) {
+    itemtree.children.sort((a, b) => b.count - a.count)
+
+    for(let item of itemtree.children) {
+        treeSort(item)
+    }
+}
+
+export {ItemTree, treeMerge, treeInit, treeCutBranches, treeSort}
\ No newline at end of file
diff --git a/match_collector/package-lock.json b/match_collector/package-lock.json
index 4d4021e..2ca418c 100644
--- a/match_collector/package-lock.json
+++ b/match_collector/package-lock.json
@@ -1,15 +1,427 @@
 {
-  "name": "stat_collector",
+  "name": "match_collector",
   "version": "1.0.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
-      "name": "stat_collector",
+      "name": "match_collector",
       "version": "1.0.0",
       "license": "ISC",
       "dependencies": {
         "mongodb": "^6.10.0"
+      },
+      "devDependencies": {
+        "@types/node": "^22.9.1",
+        "tsx": "^4.19.2"
+      }
+    },
+    "node_modules/@esbuild/aix-ppc64": {
+      "version": "0.23.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.23.1.tgz",
+      "integrity": "sha512-6VhYk1diRqrhBAqpJEdjASR/+WVRtfjpqKuNw11cLiaWpAT/Uu+nokB+UJnevzy/P9C/ty6AOe0dwueMrGh/iQ==",
+      "cpu": [
+        "ppc64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "aix"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/android-arm": {
+      "version": "0.23.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm/-/android-arm-0.23.1.tgz",
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+        "arm"
+      ],
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+      "engines": {
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+      }
+    },
+    "node_modules/@esbuild/android-arm64": {
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+      "optional": true,
+      "os": [
+        "openbsd"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/sunos-x64": {
+      "version": "0.23.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/sunos-x64/-/sunos-x64-0.23.1.tgz",
+      "integrity": "sha512-RBRT2gqEl0IKQABT4XTj78tpk9v7ehp+mazn2HbUeZl1YMdaGAQqhapjGTCe7uw7y0frDi4gS0uHzhvpFuI1sA==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "sunos"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/win32-arm64": {
+      "version": "0.23.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/win32-arm64/-/win32-arm64-0.23.1.tgz",
+      "integrity": "sha512-4O+gPR5rEBe2FpKOVyiJ7wNDPA8nGzDuJ6gN4okSA1gEOYZ67N8JPk58tkWtdtPeLz7lBnY6I5L3jdsr3S+A6A==",
+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/win32-ia32": {
+      "version": "0.23.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/win32-ia32/-/win32-ia32-0.23.1.tgz",
+      "integrity": "sha512-BcaL0Vn6QwCwre3Y717nVHZbAa4UBEigzFm6VdsVdT/MbZ38xoj1X9HPkZhbmaBGUD1W8vxAfffbDe8bA6AKnQ==",
+      "cpu": [
+        "ia32"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/win32-x64": {
+      "version": "0.23.1",
+      "resolved": "https://registry.npmjs.org/@esbuild/win32-x64/-/win32-x64-0.23.1.tgz",
+      "integrity": "sha512-BHpFFeslkWrXWyUPnbKm+xYYVYruCinGcftSBaa8zoF9hZO4BcSCFUvHVTtzpIY6YzUnYtuEhZ+C9iEXjxnasg==",
+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
+        "node": ">=18"
       }
     },
     "node_modules/@mongodb-js/saslprep": {
@@ -21,6 +433,16 @@
         "sparse-bitfield": "^3.0.3"
       }
     },
+    "node_modules/@types/node": {
+      "version": "22.9.1",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-22.9.1.tgz",
+      "integrity": "sha512-p8Yy/8sw1caA8CdRIQBG5tiLHmxtQKObCijiAa9Ez+d4+PRffM4054xbju0msf+cvhJpnFEeNjxmVT/0ipktrg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "undici-types": "~6.19.8"
+      }
+    },
     "node_modules/@types/webidl-conversions": {
       "version": "7.0.3",
       "resolved": "https://registry.npmjs.org/@types/webidl-conversions/-/webidl-conversions-7.0.3.tgz",
@@ -45,6 +467,74 @@
         "node": ">=16.20.1"
       }
     },
+    "node_modules/esbuild": {
+      "version": "0.23.1",
+      "resolved": "https://registry.npmjs.org/esbuild/-/esbuild-0.23.1.tgz",
+      "integrity": "sha512-VVNz/9Sa0bs5SELtn3f7qhJCDPCF5oMEl5cO9/SSinpE9hbPVvxbd572HH5AKiP7WD8INO53GgfDDhRjkylHEg==",
+      "dev": true,
+      "hasInstallScript": true,
+      "license": "MIT",
+      "bin": {
+        "esbuild": "bin/esbuild"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "optionalDependencies": {
+        "@esbuild/aix-ppc64": "0.23.1",
+        "@esbuild/android-arm": "0.23.1",
+        "@esbuild/android-arm64": "0.23.1",
+        "@esbuild/android-x64": "0.23.1",
+        "@esbuild/darwin-arm64": "0.23.1",
+        "@esbuild/darwin-x64": "0.23.1",
+        "@esbuild/freebsd-arm64": "0.23.1",
+        "@esbuild/freebsd-x64": "0.23.1",
+        "@esbuild/linux-arm": "0.23.1",
+        "@esbuild/linux-arm64": "0.23.1",
+        "@esbuild/linux-ia32": "0.23.1",
+        "@esbuild/linux-loong64": "0.23.1",
+        "@esbuild/linux-mips64el": "0.23.1",
+        "@esbuild/linux-ppc64": "0.23.1",
+        "@esbuild/linux-riscv64": "0.23.1",
+        "@esbuild/linux-s390x": "0.23.1",
+        "@esbuild/linux-x64": "0.23.1",
+        "@esbuild/netbsd-x64": "0.23.1",
+        "@esbuild/openbsd-arm64": "0.23.1",
+        "@esbuild/openbsd-x64": "0.23.1",
+        "@esbuild/sunos-x64": "0.23.1",
+        "@esbuild/win32-arm64": "0.23.1",
+        "@esbuild/win32-ia32": "0.23.1",
+        "@esbuild/win32-x64": "0.23.1"
+      }
+    },
+    "node_modules/fsevents": {
+      "version": "2.3.3",
+      "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.3.3.tgz",
+      "integrity": "sha512-5xoDfX+fL7faATnagmWPpbFtwh/R77WmMMqqHGS65C3vvB0YHrgF+B1YmZ3441tMj5n63k0212XNoJwzlhffQw==",
+      "dev": true,
+      "hasInstallScript": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": "^8.16.0 || ^10.6.0 || >=11.0.0"
+      }
+    },
+    "node_modules/get-tsconfig": {
+      "version": "4.8.1",
+      "resolved": "https://registry.npmjs.org/get-tsconfig/-/get-tsconfig-4.8.1.tgz",
+      "integrity": "sha512-k9PN+cFBmaLWtVz29SkUoqU5O0slLuHJXt/2P+tMVFT+phsSGXGkp9t3rQIqdz0e+06EHNGs3oM6ZX1s2zHxRg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "resolve-pkg-maps": "^1.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/privatenumber/get-tsconfig?sponsor=1"
+      }
+    },
     "node_modules/memory-pager": {
       "version": "1.5.0",
       "resolved": "https://registry.npmjs.org/memory-pager/-/memory-pager-1.5.0.tgz",
@@ -116,6 +606,16 @@
         "node": ">=6"
       }
     },
+    "node_modules/resolve-pkg-maps": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/resolve-pkg-maps/-/resolve-pkg-maps-1.0.0.tgz",
+      "integrity": "sha512-seS2Tj26TBVOC2NIc2rOe2y2ZO7efxITtLZcGSOnHHNOQ7CkiUBfw0Iw2ck6xkIhPwLhKNLS8BO+hEpngQlqzw==",
+      "dev": true,
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/privatenumber/resolve-pkg-maps?sponsor=1"
+      }
+    },
     "node_modules/sparse-bitfield": {
       "version": "3.0.3",
       "resolved": "https://registry.npmjs.org/sparse-bitfield/-/sparse-bitfield-3.0.3.tgz",
@@ -137,6 +637,33 @@
         "node": ">=14"
       }
     },
+    "node_modules/tsx": {
+      "version": "4.19.2",
+      "resolved": "https://registry.npmjs.org/tsx/-/tsx-4.19.2.tgz",
+      "integrity": "sha512-pOUl6Vo2LUq/bSa8S5q7b91cgNSjctn9ugq/+Mvow99qW6x/UZYwzxy/3NmqoT66eHYfCVvFvACC58UBPFf28g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "esbuild": "~0.23.0",
+        "get-tsconfig": "^4.7.5"
+      },
+      "bin": {
+        "tsx": "dist/cli.mjs"
+      },
+      "engines": {
+        "node": ">=18.0.0"
+      },
+      "optionalDependencies": {
+        "fsevents": "~2.3.3"
+      }
+    },
+    "node_modules/undici-types": {
+      "version": "6.19.8",
+      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-6.19.8.tgz",
+      "integrity": "sha512-ve2KP6f/JnbPBFyobGHuerC9g1FYGn/F8n1LWTwNxCEzd6IfqTwUQcNXgEtmmQ6DlRrC1hrSrBnCZPokRrDHjw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/webidl-conversions": {
       "version": "7.0.0",
       "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-7.0.0.tgz",
diff --git a/match_collector/package.json b/match_collector/package.json
index 8d21609..4d6dec6 100644
--- a/match_collector/package.json
+++ b/match_collector/package.json
@@ -1,8 +1,8 @@
 {
   "name": "match_collector",
   "version": "1.0.0",
-  "main": "index.js",
-  "type": "commonjs",
+  "main": "index.ts",
+  "type": "module",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1"
   },
@@ -11,5 +11,9 @@
   "description": "",
   "dependencies": {
     "mongodb": "^6.10.0"
+  },
+  "devDependencies": {
+    "@types/node": "^22.9.1",
+    "tsx": "^4.19.2"
   }
 }
diff --git a/match_collector/tsconfig.json b/match_collector/tsconfig.json
new file mode 100644
index 0000000..e9be2ed
--- /dev/null
+++ b/match_collector/tsconfig.json
@@ -0,0 +1,6 @@
+{
+    "compilerOptions": {
+      "types": ["node"]
+    },
+  }
+  
\ No newline at end of file