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+ "async-trait",
+ "axum",
+ "base64",
+ "bytes",
+ "h2",
+ "http",
+ "http-body",
+ "http-body-util",
+ "hyper",
+ "hyper-timeout",
+ "hyper-util",
+ "percent-encoding",
+ "pin-project",
+ "socket2",
+ "sync_wrapper",
+ "tokio",
+ "tokio-stream",
+ "tower",
+ "tower-layer",
+ "tower-service",
+ "tracing",
+]
+
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+]
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+ "futures-core",
+ "futures-util",
+ "indexmap",
+ "pin-project-lite",
+ "slab",
+ "sync_wrapper",
+ "tokio",
+ "tokio-util",
+ "tower-layer",
+ "tower-service",
+ "tracing",
+]
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+[[package]]
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+ "log",
+ "pin-project-lite",
+ "tracing-attributes",
+ "tracing-core",
+]
+
+[[package]]
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+ "quote",
+ "syn",
+]
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+[[package]]
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+]
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+ "try-lock",
+]
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
+ "windows-link",
+]
+
+[[package]]
+name = "zmij"
+version = "1.0.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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diff --git a/graphs/Cargo.toml b/graphs/Cargo.toml
new file mode 100644
index 0000000..ff1ae7c
--- /dev/null
+++ b/graphs/Cargo.toml
@@ -0,0 +1,16 @@
+[package]
+name = "analytics-graphs"
+version = "0.1.0"
+edition = "2024"
+
+[workspace]
+
+[dependencies]
+axum = "0.8"
+prost = "0.14.4"
+prost-types = "0.14.4"
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+tokio = { version = "1", features = ["macros", "rt-multi-thread", "net"] }
+tonic = "0.14.6"
+tonic-prost = "0.14.6"
diff --git a/graphs/README.md b/graphs/README.md
new file mode 100644
index 0000000..f9f7c59
--- /dev/null
+++ b/graphs/README.md
@@ -0,0 +1,28 @@
+# Analytics graphs
+
+A small Rust web server that forwards SQL queries to `AnalyticsService.ExecuteAnalyticsQuery`
+and displays the streamed result with ECharts.
+
+## Run
+
+Start the main komp_ac gRPC server, then run:
+
+```sh
+cargo run
+```
+
+Open <http://127.0.0.1:3000>. The default gRPC endpoint is
+`http://[::1]:50051`. Both addresses can be changed:
+
+```sh
+ANALYTICS_GRPC_ENDPOINT=http://127.0.0.1:50051 \
+LISTEN_ADDRESS=127.0.0.1:8080 \
+cargo run
+```
+
+The first SQL result column is used for category labels. Bar and line charts use
+all remaining columns as numeric series, pie uses the second column, and scatter
+uses the first two columns. Table view displays every returned value.
+
+ECharts is loaded from jsDelivr, so the browser needs network access when opening
+the page.
diff --git a/graphs/src/main.rs b/graphs/src/main.rs
new file mode 100644
index 0000000..f2a755e
--- /dev/null
+++ b/graphs/src/main.rs
@@ -0,0 +1,195 @@
+use std::{env, net::SocketAddr};
+
+use axum::{
+    Json, Router,
+    extract::State,
+    http::StatusCode,
+    response::Html,
+    routing::{get, post},
+};
+mod analytics {
+    include!(concat!(
+        env!("CARGO_MANIFEST_DIR"),
+        "/../common/src/proto/komp_ac.analytics.rs"
+    ));
+}
+
+use analytics::{
+    AnalyticsResultColumn, AnalyticsValue, ExecuteAnalyticsQueryRequest,
+    analytics_service_client::AnalyticsServiceClient, analytics_value,
+};
+use serde::{Deserialize, Serialize};
+use serde_json::{Value, json};
+use tonic::{Request, metadata::MetadataValue, transport::Channel};
+
+const INDEX_HTML: &str = include_str!("../static/index.html");
+
+#[derive(Clone)]
+struct AppState {
+    analytics: AnalyticsServiceClient<Channel>,
+}
+
+#[derive(Deserialize)]
+struct QueryInput {
+    profile_name: String,
+    sql: String,
+    #[serde(default)]
+    token: String,
+    #[serde(default = "default_max_rows")]
+    max_rows: u32,
+}
+
+fn default_max_rows() -> u32 {
+    1_000
+}
+
+#[derive(Serialize)]
+struct QueryOutput {
+    columns: Vec<ColumnOutput>,
+    rows: Vec<Vec<Value>>,
+    row_count: u64,
+    elapsed_ms: u64,
+    truncated: bool,
+}
+
+#[derive(Serialize)]
+struct ColumnOutput {
+    name: String,
+    data_type: String,
+}
+
+#[derive(Serialize)]
+struct ErrorOutput {
+    error: String,
+}
+
+type ApiResult<T> = Result<Json<T>, (StatusCode, Json<ErrorOutput>)>;
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let grpc_endpoint =
+        env::var("ANALYTICS_GRPC_ENDPOINT").unwrap_or_else(|_| "http://[::1]:50051".into());
+    let listen_address = env::var("LISTEN_ADDRESS")
+        .unwrap_or_else(|_| "127.0.0.1:3000".into())
+        .parse::<SocketAddr>()?;
+
+    let channel = Channel::from_shared(grpc_endpoint.clone())?.connect_lazy();
+    let state = AppState {
+        analytics: AnalyticsServiceClient::new(channel),
+    };
+
+    let app = Router::new()
+        .route("/", get(index))
+        .route("/api/query", post(run_query))
+        .with_state(state);
+
+    let listener = tokio::net::TcpListener::bind(listen_address).await?;
+    println!("Analytics graphs: http://{listen_address}");
+    println!("Analytics gRPC endpoint: {grpc_endpoint}");
+    axum::serve(listener, app).await?;
+    Ok(())
+}
+
+async fn index() -> Html<&'static str> {
+    Html(INDEX_HTML)
+}
+
+async fn run_query(State(state): State<AppState>, Json(input): Json<QueryInput>) -> ApiResult<QueryOutput> {
+    if input.profile_name.trim().is_empty() || input.sql.trim().is_empty() {
+        return Err(api_error(
+            StatusCode::BAD_REQUEST,
+            "Profile name and SQL are required",
+        ));
+    }
+
+    let mut request = Request::new(ExecuteAnalyticsQueryRequest {
+        profile_name: input.profile_name,
+        sql: input.sql,
+        max_rows: input.max_rows,
+    });
+
+    if !input.token.trim().is_empty() {
+        let value = MetadataValue::try_from(format!("Bearer {}", input.token.trim()))
+            .map_err(|_| api_error(StatusCode::BAD_REQUEST, "The bearer token is invalid"))?;
+        request.metadata_mut().insert("authorization", value);
+    }
+
+    let mut client = state.analytics;
+    let mut stream = client
+        .execute_analytics_query(request)
+        .await
+        .map_err(grpc_error)?
+        .into_inner();
+
+    let mut columns = Vec::new();
+    let mut rows = Vec::new();
+    let mut row_count = 0;
+    let mut elapsed_ms = 0;
+    let mut truncated = false;
+
+    while let Some(batch) = stream.message().await.map_err(grpc_error)? {
+        if !batch.columns.is_empty() {
+            columns = batch.columns.into_iter().map(column_output).collect();
+        }
+        rows.extend(batch.rows.into_iter().map(|row| {
+            row.values.into_iter().map(value_output).collect::<Vec<_>>()
+        }));
+
+        if batch.is_final {
+            row_count = batch.row_count;
+            elapsed_ms = batch.elapsed_ms;
+            truncated = batch.truncated;
+        }
+    }
+
+    Ok(Json(QueryOutput {
+        columns,
+        rows,
+        row_count,
+        elapsed_ms,
+        truncated,
+    }))
+}
+
+fn column_output(column: AnalyticsResultColumn) -> ColumnOutput {
+    ColumnOutput {
+        name: column.name,
+        data_type: column.data_type,
+    }
+}
+
+fn value_output(value: AnalyticsValue) -> Value {
+    match value.kind {
+        None | Some(analytics_value::Kind::NullValue(_)) => Value::Null,
+        Some(analytics_value::Kind::BoolValue(value)) => json!(value),
+        Some(analytics_value::Kind::Int64Value(value)) => json!(value),
+        Some(analytics_value::Kind::Uint64Value(value)) => json!(value),
+        Some(analytics_value::Kind::DoubleValue(value)) => json!(value),
+        Some(analytics_value::Kind::StringValue(value)) => json!(value),
+        Some(analytics_value::Kind::BytesValue(value)) => {
+            Value::String(value.iter().map(|byte| format!("{byte:02x}")).collect())
+        }
+    }
+}
+
+fn grpc_error(error: tonic::Status) -> (StatusCode, Json<ErrorOutput>) {
+    let status = match error.code() {
+        tonic::Code::InvalidArgument => StatusCode::BAD_REQUEST,
+        tonic::Code::Unauthenticated => StatusCode::UNAUTHORIZED,
+        tonic::Code::PermissionDenied => StatusCode::FORBIDDEN,
+        tonic::Code::NotFound => StatusCode::NOT_FOUND,
+        tonic::Code::ResourceExhausted => StatusCode::TOO_MANY_REQUESTS,
+        tonic::Code::Unavailable => StatusCode::SERVICE_UNAVAILABLE,
+        _ => StatusCode::BAD_GATEWAY,
+    };
+    api_error(status, error.message())
+}
+
+fn api_error(status: StatusCode, message: impl Into<String>) -> (StatusCode, Json<ErrorOutput>) {
+    (
+        status,
+        Json(ErrorOutput {
+            error: message.into(),
+        }),
+    )
+}
diff --git a/graphs/static/index.html b/graphs/static/index.html
new file mode 100644
index 0000000..b9220d6
--- /dev/null
+++ b/graphs/static/index.html
@@ -0,0 +1,167 @@
+<!doctype html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <title>Analytics graphs</title>
+  <script src="https://cdn.jsdelivr.net/npm/echarts@6/dist/echarts.min.js"></script>
+  <style>
+    * { box-sizing: border-box; }
+    body { margin: 0; font: 14px system-ui, sans-serif; color: #17202a; background: #f4f6f8; }
+    main { width: min(1200px, calc(100% - 32px)); margin: 24px auto; }
+    h1 { margin: 0 0 18px; font-size: 24px; }
+    .panel { padding: 18px; border: 1px solid #dfe4ea; border-radius: 10px; background: white; }
+    .row { display: grid; grid-template-columns: 1fr 1fr 180px 120px; gap: 12px; margin-bottom: 12px; }
+    label { display: grid; gap: 5px; color: #4b5563; font-size: 12px; }
+    input, select, textarea, button { font: inherit; }
+    input, select, textarea { width: 100%; border: 1px solid #cfd6dd; border-radius: 6px; padding: 9px; background: white; }
+    textarea { min-height: 130px; resize: vertical; font-family: ui-monospace, monospace; line-height: 1.45; }
+    .actions { display: flex; align-items: center; gap: 12px; margin-top: 12px; }
+    button { border: 0; border-radius: 6px; padding: 10px 18px; color: white; background: #2563eb; cursor: pointer; }
+    button:disabled { opacity: .55; cursor: wait; }
+    #status { color: #667085; }
+    #status.error { color: #b42318; }
+    #chart { height: 560px; margin-top: 18px; }
+    .table-wrap { display: none; max-height: 560px; overflow: auto; margin-top: 18px; }
+    table { width: 100%; border-collapse: collapse; background: white; }
+    th, td { padding: 9px 11px; border: 1px solid #e4e7ec; text-align: left; white-space: nowrap; }
+    th { position: sticky; top: 0; background: #f9fafb; }
+    @media (max-width: 760px) { .row { grid-template-columns: 1fr; } main { width: calc(100% - 20px); } }
+  </style>
+</head>
+<body>
+  <main>
+    <h1>Analytics graphs</h1>
+    <form id="query-form" class="panel">
+      <div class="row">
+        <label>Profile<input id="profile" required autocomplete="off"></label>
+        <label>Bearer token<input id="token" type="password" autocomplete="off"></label>
+        <label>Chart
+          <select id="chart-type">
+            <option value="bar">Bar</option>
+            <option value="line">Line</option>
+            <option value="pie">Pie</option>
+            <option value="scatter">Scatter</option>
+            <option value="table">Table</option>
+          </select>
+        </label>
+        <label>Max rows<input id="max-rows" type="number" min="1" value="1000"></label>
+      </div>
+      <label>SQL<textarea id="sql" required spellcheck="false" placeholder="SELECT category, SUM(amount) AS total FROM sales GROUP BY category"></textarea></label>
+      <div class="actions">
+        <button id="run" type="submit">Run query</button>
+        <span id="status"></span>
+      </div>
+    </form>
+    <div id="chart"></div>
+    <div id="table-wrap" class="table-wrap"><table id="table"></table></div>
+  </main>
+  <script>
+    const form = document.querySelector('#query-form');
+    const status = document.querySelector('#status');
+    const runButton = document.querySelector('#run');
+    const chartElement = document.querySelector('#chart');
+    const tableWrap = document.querySelector('#table-wrap');
+    const table = document.querySelector('#table');
+    const chart = echarts.init(chartElement);
+    let lastResult = null;
+
+    form.addEventListener('submit', async (event) => {
+      event.preventDefault();
+      runButton.disabled = true;
+      setStatus('Running…');
+      try {
+        const response = await fetch('/api/query', {
+          method: 'POST',
+          headers: { 'content-type': 'application/json' },
+          body: JSON.stringify({
+            profile_name: document.querySelector('#profile').value,
+            token: document.querySelector('#token').value,
+            sql: document.querySelector('#sql').value,
+            max_rows: Number(document.querySelector('#max-rows').value)
+          })
+        });
+        const result = await response.json();
+        if (!response.ok) throw new Error(result.error || `Request failed (${response.status})`);
+        lastResult = result;
+        render(result);
+        setStatus(`${result.row_count} rows in ${result.elapsed_ms} ms${result.truncated ? ' (truncated)' : ''}`);
+      } catch (error) {
+        setStatus(error.message, true);
+      } finally {
+        runButton.disabled = false;
+      }
+    });
+
+    document.querySelector('#chart-type').addEventListener('change', () => {
+      if (lastResult) render(lastResult);
+    });
+    window.addEventListener('resize', () => chart.resize());
+
+    function render(result) {
+      const type = document.querySelector('#chart-type').value;
+      if (type === 'table') return renderTable(result);
+      tableWrap.style.display = 'none';
+      chartElement.style.display = 'block';
+      if (!result.columns.length) {
+        chart.clear();
+        return;
+      }
+
+      const names = result.columns.map(column => column.name);
+      const rows = result.rows;
+      let option;
+      if (type === 'pie') {
+        option = {
+          tooltip: { trigger: 'item' },
+          legend: { type: 'scroll', bottom: 0 },
+          series: [{ type: 'pie', radius: ['25%', '68%'], data: rows.map(row => ({ name: String(row[0] ?? ''), value: numeric(row[1]) })) }]
+        };
+      } else if (type === 'scatter') {
+        option = {
+          tooltip: { trigger: 'item' },
+          xAxis: { name: names[0], type: 'value' },
+          yAxis: { name: names[1], type: 'value' },
+          series: [{ name: names[1], type: 'scatter', data: rows.map(row => [numeric(row[0]), numeric(row[1])]) }]
+        };
+      } else {
+        option = {
+          tooltip: { trigger: 'axis' },
+          legend: { type: 'scroll', bottom: 0 },
+          grid: { left: 55, right: 25, top: 35, bottom: 70, containLabel: true },
+          xAxis: { type: 'category', data: rows.map(row => String(row[0] ?? '')) },
+          yAxis: { type: 'value' },
+          series: names.slice(1).map((name, index) => ({ name, type, data: rows.map(row => numeric(row[index + 1])), smooth: type === 'line' }))
+        };
+      }
+      chart.setOption(option, true);
+      chart.resize();
+    }
+
+    function renderTable(result) {
+      chartElement.style.display = 'none';
+      tableWrap.style.display = 'block';
+      const header = `<thead><tr>${result.columns.map(column => `<th>${escapeHtml(column.name)}</th>`).join('')}</tr></thead>`;
+      const body = `<tbody>${result.rows.map(row => `<tr>${row.map(value => `<td>${escapeHtml(value ?? '')}</td>`).join('')}</tr>`).join('')}</tbody>`;
+      table.innerHTML = header + body;
+    }
+
+    function numeric(value) {
+      const number = Number(value);
+      return Number.isFinite(number) ? number : null;
+    }
+
+    function escapeHtml(value) {
+      const element = document.createElement('div');
+      element.textContent = String(value);
+      return element.innerHTML;
+    }
+
+    function setStatus(message, error = false) {
+      status.textContent = message;
+      status.classList.toggle('error', error);
+    }
+  </script>
+</body>
+</html>
+