diff --git a/app/builders/v2/reports/inbox_leads_summary_builder.rb b/app/builders/v2/reports/inbox_leads_summary_builder.rb
new file mode 100644
index 000000000..053b53596
--- /dev/null
+++ b/app/builders/v2/reports/inbox_leads_summary_builder.rb
@@ -0,0 +1,111 @@
+class V2::Reports::InboxLeadsSummaryBuilder
+  include DateRangeHelper
+
+  ALLOWED_GROUP_BY = %w[day week month].freeze
+  RETURN_THRESHOLD = '24 hours'.freeze
+
+  attr_reader :account, :params
+
+  def initialize(account, params)
+    @account = account
+    @params = params
+  end
+
+  def build
+    return [] if range.blank? || inbox.blank?
+
+    rows = ActiveRecord::Base.connection.exec_query(
+      ActiveRecord::Base.sanitize_sql_array([sql, sql_bindings])
+    )
+
+    rows.map do |row|
+      {
+        period: row['period'].iso8601,
+        new_leads: row['new_leads'].to_i,
+        returning: row['returning'].to_i,
+        others: row['others'].to_i
+      }
+    end
+  end
+
+  private
+
+  def inbox
+    @inbox ||= account.inboxes.find_by(id: params[:inbox_id])
+  end
+
+  def group_by
+    value = params[:group_by].to_s
+    ALLOWED_GROUP_BY.include?(value) ? value : 'day'
+  end
+
+  def sql_bindings
+    {
+      account_id: account.id,
+      inbox_id: inbox.id,
+      since: range.begin,
+      until_t: range.end,
+      group_by: group_by,
+      return_threshold: RETURN_THRESHOLD
+    }
+  end
+
+  # Single CTE to classify each conversation in the period as:
+  #   * new_leads:  contact has no prior conversation in any inbox of the account
+  #   * returning:  contact had a prior conversation whose latest 'conversation_resolved'
+  #                 event occurred more than 24h before the new conversation
+  #   * others:     prior conversation existed but was not resolved or was resolved <24h ago
+  # rubocop:disable Metrics/MethodLength
+  def sql
+    <<~SQL.squish
+      WITH period_conversations AS (
+        SELECT id, contact_id, created_at
+        FROM conversations
+        WHERE account_id = :account_id
+          AND inbox_id = :inbox_id
+          AND created_at >= :since
+          AND created_at < :until_t
+      ),
+      classified AS (
+        SELECT
+          c.id,
+          c.created_at,
+          EXISTS (
+            SELECT 1 FROM conversations prev
+            WHERE prev.contact_id = c.contact_id
+              AND prev.account_id = :account_id
+              AND prev.id < c.id
+          ) AS has_prior,
+          (
+            SELECT MAX(re.created_at)
+            FROM reporting_events re
+            INNER JOIN conversations prev ON prev.id = re.conversation_id
+            WHERE re.name = 'conversation_resolved'
+              AND prev.contact_id = c.contact_id
+              AND prev.account_id = :account_id
+              AND prev.id < c.id
+          ) AS latest_prior_resolution_at
+        FROM period_conversations c
+      )
+      SELECT
+        date_trunc(:group_by, created_at) AS period,
+        COUNT(*) FILTER (WHERE NOT has_prior) AS new_leads,
+        COUNT(*) FILTER (
+          WHERE has_prior
+            AND latest_prior_resolution_at IS NOT NULL
+            AND latest_prior_resolution_at < created_at - (:return_threshold)::interval
+        ) AS returning,
+        COUNT(*) FILTER (
+          WHERE has_prior
+            AND (
+              latest_prior_resolution_at IS NULL
+              OR latest_prior_resolution_at >= created_at - (:return_threshold)::interval
+            )
+        ) AS others
+      FROM classified
+      GROUP BY period
+      ORDER BY period
+    SQL
+  end
+  # rubocop:enable Metrics/MethodLength
+end
diff --git a/app/controllers/api/v2/accounts/reports_controller.rb b/app/controllers/api/v2/accounts/reports_controller.rb
index 192b3619c..4fe1656e0 100644
--- a/app/controllers/api/v2/accounts/reports_controller.rb
+++ b/app/controllers/api/v2/accounts/reports_controller.rb
@@ -87,6 +87,13 @@ class Api::V2::Accounts::ReportsController < Api::V1::Accounts::BaseController
     render json: builder.build
   end
 
+  def inbox_leads_summary
+    return head :unprocessable_entity if params[:inbox_id].blank?
+
+    builder = V2::Reports::InboxLeadsSummaryBuilder.new(Current.account, inbox_leads_summary_params)
+    render json: builder.build
+  end
+
   private
 
   def generate_csv(filename, template)
@@ -188,4 +195,13 @@ class Api::V2::Accounts::ReportsController < Api::V1::Accounts::BaseController
       until: params[:until]
     }
   end
+
+  def inbox_leads_summary_params
+    {
+      inbox_id: params[:inbox_id],
+      group_by: params[:group_by],
+      since: params[:since],
+      until: params[:until]
+    }
+  end
 end
diff --git a/app/javascript/dashboard/api/reports.js b/app/javascript/dashboard/api/reports.js
index 00f040f8e..55cf25bc8 100644
--- a/app/javascript/dashboard/api/reports.js
+++ b/app/javascript/dashboard/api/reports.js
@@ -108,6 +108,18 @@ class ReportsAPI extends ApiClient {
       },
     });
   }
+
+  getInboxLeadsSummary({ inboxId, from, to, groupBy } = {}) {
+    return axios.get(`${this.url}/inbox_leads_summary`, {
+      params: {
+        inbox_id: inboxId,
+        since: from,
+        until: to,
+        group_by: groupBy,
+        timezone_offset: getTimeOffset(),
+      },
+    });
+  }
 }
 
 export default new ReportsAPI();
diff --git a/app/javascript/dashboard/i18n/locale/en/report.json b/app/javascript/dashboard/i18n/locale/en/report.json
index 2ffa0ef11..003cb72af 100644
--- a/app/javascript/dashboard/i18n/locale/en/report.json
+++ b/app/javascript/dashboard/i18n/locale/en/report.json
@@ -281,6 +281,33 @@
     "FILTER_DROPDOWN_LABEL": "Select Inbox",
     "ALL_INBOXES": "All Inboxes",
     "SEARCH_INBOX": "Search Inbox",
+    "TABS": {
+      "OVERVIEW": "Overview",
+      "LEADS": "New × Returning"
+    },
+    "LEADS": {
+      "EMPTY": "No conversations in this period.",
+      "TOTAL": "Total conversations in the period: {count}",
+      "METRICS": {
+        "NEW_LEADS": {
+          "LABEL": "New leads",
+          "INFO": "Conversations from contacts who never spoke to any inbox of the network before."
+        },
+        "RETURNING": {
+          "LABEL": "Returning",
+          "INFO": "Conversations from contacts whose most recent prior conversation was resolved more than 24h ago."
+        },
+        "OTHERS": {
+          "LABEL": "Others",
+          "INFO": "Conversations from contacts whose prior conversation is still open or was resolved less than 24h ago."
+        }
+      },
+      "CHART": {
+        "NEW_LEADS": "New",
+        "RETURNING": "Returning",
+        "OTHERS": "Others"
+      }
+    },
     "FILTERS": {
       "INPUT_PLACEHOLDER": {
         "INBOXES": "Search inboxes"
diff --git a/app/javascript/dashboard/i18n/locale/pt_BR/report.json b/app/javascript/dashboard/i18n/locale/pt_BR/report.json
index 426e895c1..de38aaf93 100644
--- a/app/javascript/dashboard/i18n/locale/pt_BR/report.json
+++ b/app/javascript/dashboard/i18n/locale/pt_BR/report.json
@@ -269,8 +269,35 @@
     "NO_ENOUGH_DATA": "Não existem dados suficientes para gerar o relatório. Tente novamente mais tarde.",
     "DOWNLOAD_INBOX_REPORTS": "Baixar relatórios de entrada",
     "FILTER_DROPDOWN_LABEL": "Selecionar caixa de entrada",
-    "ALL_INBOXES": "All Inboxes",
-    "SEARCH_INBOX": "Search Inbox",
+    "ALL_INBOXES": "Todas as caixas",
+    "SEARCH_INBOX": "Buscar caixa",
+    "TABS": {
+      "OVERVIEW": "Visão Geral",
+      "LEADS": "Novas × Retorno"
+    },
+    "LEADS": {
+      "EMPTY": "Sem conversas no período.",
+      "TOTAL": "Total de conversas no período: {count}",
+      "METRICS": {
+        "NEW_LEADS": {
+          "LABEL": "Leads novos",
+          "INFO": "Conversas de contatos que nunca falaram em nenhuma caixa da rede antes."
+        },
+        "RETURNING": {
+          "LABEL": "Retorno",
+          "INFO": "Conversas de contatos cuja conversa anterior mais recente foi resolvida há mais de 24h."
+        },
+        "OTHERS": {
+          "LABEL": "Outras",
+          "INFO": "Conversas de contatos cuja conversa anterior ainda está aberta ou foi resolvida há menos de 24h."
+        }
+      },
+      "CHART": {
+        "NEW_LEADS": "Novas",
+        "RETURNING": "Retorno",
+        "OTHERS": "Outras"
+      }
+    },
     "METRICS": {
       "CONVERSATIONS": {
         "NAME": "Conversas",
diff --git a/app/javascript/dashboard/routes/dashboard/settings/reports/InboxReportsShow.vue b/app/javascript/dashboard/routes/dashboard/settings/reports/InboxReportsShow.vue
index 06b584aae..c2e4ccb10 100644
--- a/app/javascript/dashboard/routes/dashboard/settings/reports/InboxReportsShow.vue
+++ b/app/javascript/dashboard/routes/dashboard/settings/reports/InboxReportsShow.vue
@@ -1,26 +1,71 @@
 <script setup>
+import { ref } from 'vue';
 import { useRoute } from 'vue-router';
 import { useFunctionGetter } from 'dashboard/composables/store';
 
 import WootReports from './components/WootReports.vue';
+import InboxLeadsReport from './components/InboxLeadsReport.vue';
 import Spinner from 'dashboard/components-next/spinner/Spinner.vue';
 
 const route = useRoute();
 const inbox = useFunctionGetter('inboxes/getInboxById', route.params.id);
+
+const TABS = {
+  OVERVIEW: 'overview',
+  LEADS: 'leads',
+};
+
+const activeTab = ref(TABS.OVERVIEW);
 </script>
 
 <template>
-  <WootReports
-    v-if="inbox.id"
-    :key="inbox.id"
-    type="inbox"
-    getter-key="inboxes/getInboxes"
-    action-key="inboxes/get"
-    :selected-item="inbox"
-    :download-button-label="$t('INBOX_REPORTS.DOWNLOAD_INBOX_REPORTS')"
-    :report-title="$t('INBOX_REPORTS.HEADER')"
-    has-back-button
-  />
+  <div v-if="inbox.id" class="flex flex-col w-full">
+    <div class="flex items-center gap-6 px-6 pt-4 border-b border-n-weak">
+      <button
+        type="button"
+        class="py-3 text-sm font-medium border-b-2 transition-colors"
+        :class="
+          activeTab === TABS.OVERVIEW
+            ? 'border-n-brand text-n-brand'
+            : 'border-transparent text-n-slate-11 hover:text-n-slate-12'
+        "
+        @click="activeTab = TABS.OVERVIEW"
+      >
+        {{ $t('INBOX_REPORTS.TABS.OVERVIEW') }}
+      </button>
+      <button
+        type="button"
+        class="py-3 text-sm font-medium border-b-2 transition-colors"
+        :class="
+          activeTab === TABS.LEADS
+            ? 'border-n-brand text-n-brand'
+            : 'border-transparent text-n-slate-11 hover:text-n-slate-12'
+        "
+        @click="activeTab = TABS.LEADS"
+      >
+        {{ $t('INBOX_REPORTS.TABS.LEADS') }}
+      </button>
+    </div>
+
+    <div class="px-6 py-4">
+      <WootReports
+        v-if="activeTab === TABS.OVERVIEW"
+        :key="`overview-${inbox.id}`"
+        type="inbox"
+        getter-key="inboxes/getInboxes"
+        action-key="inboxes/get"
+        :selected-item="inbox"
+        :download-button-label="$t('INBOX_REPORTS.DOWNLOAD_INBOX_REPORTS')"
+        :report-title="$t('INBOX_REPORTS.HEADER')"
+        has-back-button
+      />
+      <InboxLeadsReport
+        v-else-if="activeTab === TABS.LEADS"
+        :key="`leads-${inbox.id}`"
+        :inbox-id="inbox.id"
+      />
+    </div>
+  </div>
   <div v-else class="w-full py-20">
     <Spinner class="mx-auto" />
   </div>
diff --git a/app/javascript/dashboard/routes/dashboard/settings/reports/components/InboxLeadsReport.vue b/app/javascript/dashboard/routes/dashboard/settings/reports/components/InboxLeadsReport.vue
new file mode 100644
index 000000000..80bfa08a0
--- /dev/null
+++ b/app/javascript/dashboard/routes/dashboard/settings/reports/components/InboxLeadsReport.vue
@@ -0,0 +1,156 @@
+<script setup>
+import { computed, ref, watch } from 'vue';
+import { useStore } from 'vuex';
+import { useI18n } from 'vue-i18n';
+import { format } from 'date-fns';
+import ReportFilters from './ReportFilters.vue';
+import ReportMetricCard from './ReportMetricCard.vue';
+import BarChart from 'shared/components/charts/BarChart.vue';
+import Spinner from 'dashboard/components-next/spinner/Spinner.vue';
+
+const props = defineProps({
+  inboxId: {
+    type: [Number, String],
+    required: true,
+  },
+});
+
+const store = useStore();
+const { t } = useI18n();
+
+const filters = ref({
+  from: null,
+  to: null,
+  groupBy: { id: 1, period: 'day' },
+});
+
+const isFetching = computed(() => store.getters.getInboxLeadsSummaryFetching);
+const rows = computed(() => store.getters.getInboxLeadsSummary || []);
+
+const totals = computed(() => {
+  return rows.value.reduce(
+    (acc, row) => {
+      acc.new_leads += row.new_leads || 0;
+      acc.returning += row.returning || 0;
+      acc.others += row.others || 0;
+      return acc;
+    },
+    { new_leads: 0, returning: 0, others: 0 }
+  );
+});
+
+const totalConversations = computed(
+  () => totals.value.new_leads + totals.value.returning + totals.value.others
+);
+
+const formatPeriodLabel = (iso, period) => {
+  const date = new Date(iso);
+  if (period === 'month') return format(date, 'MMM/yy');
+  if (period === 'week') return format(date, "'S'II/yy");
+  return format(date, 'dd/MM');
+};
+
+const chartCollection = computed(() => {
+  const period = filters.value.groupBy?.period || 'day';
+  return {
+    labels: rows.value.map(r => formatPeriodLabel(r.period, period)),
+    datasets: [
+      {
+        label: t('INBOX_REPORTS.LEADS.CHART.NEW_LEADS'),
+        backgroundColor: '#10B981',
+        data: rows.value.map(r => r.new_leads),
+      },
+      {
+        label: t('INBOX_REPORTS.LEADS.CHART.RETURNING'),
+        backgroundColor: '#3B82F6',
+        data: rows.value.map(r => r.returning),
+      },
+      {
+        label: t('INBOX_REPORTS.LEADS.CHART.OTHERS'),
+        backgroundColor: '#9CA3AF',
+        data: rows.value.map(r => r.others),
+      },
+    ],
+  };
+});
+
+const chartOptions = {
+  plugins: {
+    legend: { display: true, position: 'bottom' },
+  },
+  scales: {
+    x: { stacked: true, grid: { drawOnChartArea: false } },
+    y: { stacked: true, beginAtZero: true, ticks: { stepSize: 1 } },
+  },
+};
+
+const fetchData = () => {
+  if (!filters.value.from || !filters.value.to) return;
+  store.dispatch('fetchInboxLeadsSummary', {
+    inboxId: props.inboxId,
+    from: filters.value.from,
+    to: filters.value.to,
+    groupBy: filters.value.groupBy?.period || 'day',
+  });
+};
+
+const onFilterChange = payload => {
+  filters.value = {
+    from: payload.from,
+    to: payload.to,
+    groupBy: payload.groupBy || filters.value.groupBy,
+  };
+  fetchData();
+};
+
+watch(
+  () => props.inboxId,
+  () => fetchData()
+);
+</script>
+
+<template>
+  <div class="flex flex-col gap-6">
+    <ReportFilters
+      filter-type="inboxes"
+      :selected-item="{ id: Number(inboxId) }"
+      :show-business-hours="false"
+      :show-entity-filter="false"
+      @filter-change="onFilterChange"
+    />
+
+    <div class="grid grid-cols-1 gap-4 sm:grid-cols-3">
+      <ReportMetricCard
+        :label="$t('INBOX_REPORTS.LEADS.METRICS.NEW_LEADS.LABEL')"
+        :value="String(totals.new_leads)"
+        :info-text="$t('INBOX_REPORTS.LEADS.METRICS.NEW_LEADS.INFO')"
+      />
+      <ReportMetricCard
+        :label="$t('INBOX_REPORTS.LEADS.METRICS.RETURNING.LABEL')"
+        :value="String(totals.returning)"
+        :info-text="$t('INBOX_REPORTS.LEADS.METRICS.RETURNING.INFO')"
+      />
+      <ReportMetricCard
+        :label="$t('INBOX_REPORTS.LEADS.METRICS.OTHERS.LABEL')"
+        :value="String(totals.others)"
+        :info-text="$t('INBOX_REPORTS.LEADS.METRICS.OTHERS.INFO')"
+      />
+    </div>
+
+    <div
+      class="bg-n-solid-1 border border-n-weak rounded-lg p-4 min-h-[320px] flex items-center justify-center"
+    >
+      <Spinner v-if="isFetching" />
+      <div v-else-if="rows.length === 0" class="text-sm text-n-slate-11">
+        {{ $t('INBOX_REPORTS.LEADS.EMPTY') }}
+      </div>
+      <div v-else class="w-full h-[320px]">
+        <BarChart :collection="chartCollection" :chart-options="chartOptions" />
+      </div>
+    </div>
+
+    <div class="text-xs text-n-slate-11">
+      {{ $t('INBOX_REPORTS.LEADS.TOTAL', { count: totalConversations }) }}
+    </div>
+  </div>
+</template>
diff --git a/app/javascript/dashboard/store/modules/reports.js b/app/javascript/dashboard/store/modules/reports.js
index bb62a9b17..2118a163d 100644
--- a/app/javascript/dashboard/store/modules/reports.js
+++ b/app/javascript/dashboard/store/modules/reports.js
@@ -67,6 +67,10 @@ const state = {
     agentConversationMetric: [],
     teamConversationMetric: [],
   },
+  inboxLeadsSummary: {
+    isFetching: false,
+    data: [],
+  },
 };
 
 const getters = {
@@ -103,6 +107,12 @@ const getters = {
   getOverviewUIFlags($state) {
     return $state.overview.uiFlags;
   },
+  getInboxLeadsSummary(_state) {
+    return _state.inboxLeadsSummary.data;
+  },
+  getInboxLeadsSummaryFetching(_state) {
+    return _state.inboxLeadsSummary.isFetching;
+  },
 };
 
 export const actions = {
@@ -286,6 +296,20 @@ export const actions = {
         console.error(error);
       });
   },
+  fetchInboxLeadsSummary({ commit }, reportObj) {
+    commit(types.default.TOGGLE_INBOX_LEADS_SUMMARY_LOADING, true);
+    return Report.getInboxLeadsSummary(reportObj)
+      .then(response => {
+        commit(types.default.SET_INBOX_LEADS_SUMMARY, response.data || []);
+      })
+      .catch(error => {
+        console.error(error);
+        commit(types.default.SET_INBOX_LEADS_SUMMARY, []);
+      })
+      .finally(() => {
+        commit(types.default.TOGGLE_INBOX_LEADS_SUMMARY_LOADING, false);
+      });
+  },
   downloadAccountConversationHeatmap(_, reportObj) {
     Report.getConversationTrafficCSV({ daysBefore: reportObj.daysBefore })
       .then(response => {
@@ -357,6 +381,12 @@ const mutations = {
   [types.default.TOGGLE_TEAM_CONVERSATION_METRIC_LOADING](_state, flag) {
     _state.overview.uiFlags.isFetchingTeamConversationMetric = flag;
   },
+  [types.default.SET_INBOX_LEADS_SUMMARY](_state, data) {
+    _state.inboxLeadsSummary.data = data;
+  },
+  [types.default.TOGGLE_INBOX_LEADS_SUMMARY_LOADING](_state, flag) {
+    _state.inboxLeadsSummary.isFetching = flag;
+  },
 };
 
 export default {
diff --git a/app/javascript/dashboard/store/mutation-types.js b/app/javascript/dashboard/store/mutation-types.js
index 80fb98ea7..1082f95f6 100644
--- a/app/javascript/dashboard/store/mutation-types.js
+++ b/app/javascript/dashboard/store/mutation-types.js
@@ -209,6 +209,8 @@ export default {
   SET_AGENT_CONVERSATION_METRIC: 'SET_AGENT_CONVERSATION_METRIC',
   TOGGLE_AGENT_CONVERSATION_METRIC_LOADING:
     'TOGGLE_AGENT_CONVERSATION_METRIC_LOADING',
+  SET_INBOX_LEADS_SUMMARY: 'SET_INBOX_LEADS_SUMMARY',
+  TOGGLE_INBOX_LEADS_SUMMARY_LOADING: 'TOGGLE_INBOX_LEADS_SUMMARY_LOADING',
 
   // Conversation Metadata
   SET_CONVERSATION_METADATA: 'SET_CONVERSATION_METADATA',
diff --git a/config/routes.rb b/config/routes.rb
index 8e17989e3..ab55dee1d 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -515,6 +515,7 @@ Rails.application.routes.draw do
               get :inbox_label_matrix
               get :first_response_time_distribution
               get :outgoing_messages_count
+              get :inbox_leads_summary
             end
           end
           resource :year_in_review, only: [:show]
diff --git a/spec/builders/v2/reports/inbox_leads_summary_builder_spec.rb b/spec/builders/v2/reports/inbox_leads_summary_builder_spec.rb
new file mode 100644
index 000000000..dc036b4ca
--- /dev/null
+++ b/spec/builders/v2/reports/inbox_leads_summary_builder_spec.rb
@@ -0,0 +1,141 @@
+require 'rails_helper'
+
+RSpec.describe V2::Reports::InboxLeadsSummaryBuilder do
+  let(:account) { create(:account) }
+  let(:inbox)   { create(:inbox, account: account) }
+  let(:other_inbox) { create(:inbox, account: account) }
+
+  let(:since_t) { 30.days.ago.beginning_of_day }
+  let(:until_t) { Time.current.end_of_day }
+
+  let(:base_params) do
+    {
+      inbox_id: inbox.id,
+      since: since_t.to_i.to_s,
+      until: until_t.to_i.to_s,
+      group_by: 'day'
+    }
+  end
+
+  def build(params = base_params)
+    described_class.new(account, params).build
+  end
+
+  def total_for(rows, key)
+    rows.sum { |r| r[key] }
+  end
+
+  describe '#build' do
+    context 'when no inbox is provided or invalid' do
+      it 'returns empty array when inbox_id missing' do
+        expect(build(base_params.except(:inbox_id))).to eq([])
+      end
+
+      it 'returns empty array when range missing' do
+        expect(build(base_params.except(:since))).to eq([])
+      end
+
+      it 'returns empty array when inbox does not belong to account' do
+        foreign_inbox = create(:inbox, account: create(:account))
+        expect(build(base_params.merge(inbox_id: foreign_inbox.id))).to eq([])
+      end
+    end
+
+    context 'when classifying conversations' do
+      it 'counts as new_lead when contact has no prior conversation' do
+        contact = create(:contact, account: account)
+        create(:conversation, account: account, inbox: inbox, contact: contact, created_at: 2.days.ago)
+
+        rows = build
+        expect(total_for(rows, :new_leads)).to eq(1)
+        expect(total_for(rows, :returning)).to eq(0)
+        expect(total_for(rows, :others)).to eq(0)
+      end
+
+      it 'counts as returning when prior conversation was resolved >24h ago' do
+        contact = create(:contact, account: account)
+        prior = create(:conversation, account: account, inbox: other_inbox, contact: contact, created_at: 10.days.ago)
+        create(:reporting_event, account: account, inbox: other_inbox, conversation: prior,
+                                 name: 'conversation_resolved', value: 100, value_in_business_hours: 50,
+                                 created_at: 5.days.ago)
+        create(:conversation, account: account, inbox: inbox, contact: contact, created_at: 1.day.ago)
+
+        rows = build
+        expect(total_for(rows, :new_leads)).to eq(0)
+        expect(total_for(rows, :returning)).to eq(1)
+        expect(total_for(rows, :others)).to eq(0)
+      end
+
+      it 'counts as others when prior conversation was resolved <24h ago' do
+        contact = create(:contact, account: account)
+        prior = create(:conversation, account: account, inbox: inbox, contact: contact, created_at: 2.days.ago)
+        create(:reporting_event, account: account, inbox: inbox, conversation: prior,
+                                 name: 'conversation_resolved', value: 100, value_in_business_hours: 50,
+                                 created_at: 3.hours.ago)
+        create(:conversation, account: account, inbox: inbox, contact: contact, created_at: 1.hour.ago)
+
+        rows = build
+        expect(total_for(rows, :new_leads)).to eq(0)
+        expect(total_for(rows, :returning)).to eq(0)
+        expect(total_for(rows, :others)).to eq(1)
+      end
+
+      it 'counts as others when contact had prior conversation but it was never resolved' do
+        contact = create(:contact, account: account)
+        create(:conversation, account: account, inbox: inbox, contact: contact, created_at: 5.days.ago)
+        create(:conversation, account: account, inbox: inbox, contact: contact, created_at: 1.day.ago)
+
+        rows = build
+        expect(total_for(rows, :new_leads)).to eq(1) # the older one
+        expect(total_for(rows, :returning)).to eq(0)
+        expect(total_for(rows, :others)).to eq(1) # the newer one
+      end
+
+      it 'considers prior conversations from any inbox of the account (network-wide)' do
+        contact = create(:contact, account: account)
+        prior = create(:conversation, account: account, inbox: other_inbox, contact: contact, created_at: 10.days.ago)
+        create(:reporting_event, account: account, inbox: other_inbox, conversation: prior,
+                                 name: 'conversation_resolved', value: 100, value_in_business_hours: 50,
+                                 created_at: 5.days.ago)
+        create(:conversation, account: account, inbox: inbox, contact: contact, created_at: 1.day.ago)
+
+        rows = build
+        expect(total_for(rows, :new_leads)).to eq(0)
+        expect(total_for(rows, :returning)).to eq(1)
+      end
+    end
+
+    context 'when scoped to a specific inbox' do
+      it 'only counts conversations of the requested inbox' do
+        contact_a = create(:contact, account: account)
+        contact_b = create(:contact, account: account)
+        create(:conversation, account: account, inbox: inbox, contact: contact_a, created_at: 1.day.ago)
+        create(:conversation, account: account, inbox: other_inbox, contact: contact_b, created_at: 1.day.ago)
+
+        rows = build
+        expect(total_for(rows, :new_leads)).to eq(1)
+      end
+    end
+
+    context 'when filtering by period range' do
+      it 'ignores conversations outside the range' do
+        contact = create(:contact, account: account)
+        create(:conversation, account: account, inbox: inbox, contact: contact, created_at: 60.days.ago)
+
+        rows = build
+        expect(total_for(rows, :new_leads)).to eq(0)
+      end
+    end
+
+    context 'when validating response shape' do
+      it 'returns rows with iso8601 period and integer counts' do
+        contact = create(:contact, account: account)
+        create(:conversation, account: account, inbox: inbox, contact: contact, created_at: 1.day.ago)
+
+        rows = build
+        expect(rows).to all(include(:period, :new_leads, :returning, :others))
+        expect(rows.first[:period]).to match(/\d{4}-\d{2}-\d{2}T/)
+      end
+    end
+  end
+end