update giao diện web

orangepi-server/requirements.txt

@@ -2,3 +2,4 @@ fastapi>=0.110.0
 uvicorn[standard]>=0.29.0
 websockets>=11.0
 aiohttp>=3.8.0
+aiosqlite>=0.18.0

orangepi-server/static/app.js

@@ -52,6 +52,19 @@ const I18N = {
         edit_zone_y1: "Y1",
         edit_zone_x2: "X2",
         edit_zone_y2: "Y2",
+
+        tab_radar:   "Radar",
+        tab_history: "Lịch sử",
+        history_title: "Lịch sử phát hiện",
+        history_summary_empty: "Chưa có dữ liệu — hãy vẫy tay trước radar để tạo bản ghi đầu tiên.",
+        history_summary_with: "Tổng {total} lần detect · {uniq} slot khác nhau trong ngày.",
+        history_date: "Ngày",
+        history_hour: "Giờ",
+        history_refresh: "Tải lại",
+        history_hour_bucket: "{hh}h — {n} lần detect",
+        history_no_data: "Không có bản ghi nào trong khoảng thời gian đã chọn",
+        history_detected: "Phát hiện",
+        history_xy: "Tọa độ",
     },
     en: {
         page_title: "ESP32 LD2453 — Radar Web Visualizer",
@@ -100,6 +113,19 @@ const I18N = {
         edit_zone_y1: "Y1",
         edit_zone_x2: "X2",
         edit_zone_y2: "Y2",
+
+        tab_radar:   "Radar",
+        tab_history: "History",
+        history_title: "Detection history",
+        history_summary_empty: "No records yet — wave in front of the radar to create the first row.",
+        history_summary_with: "Total {total} detections · {uniq} different slots for the day.",
+        history_date: "Date",
+        history_hour: "Hour",
+        history_refresh: "Refresh",
+        history_hour_bucket: "{hh}:00 — {n} detections",
+        history_no_data: "No detections in the selected window",
+        history_detected: "Detected",
+        history_xy: "Coordinates",
     },
 };
 
@@ -803,6 +829,139 @@ function loop() {
     requestAnimationFrame(loop);
 }
 
+/* ---------- Tab wiring + History tab ---------- */
+function switchTab(tabName) {
+    if (!["radar", "history"].includes(tabName)) tabName = "radar";
+    State.activeTab = tabName;
+    localStorage.setItem("activeTab", tabName);
+
+    $$(".tab-btn").forEach(b => {
+        const active = (b.dataset.tab === tabName);
+        b.classList.toggle("tab-active", active);
+        b.setAttribute("aria-selected", String(active));
+    });
+    $$("[data-tab-panel]").forEach(p => {
+        p.hidden = (p.dataset.tabPanel !== tabName);
+    });
+
+    if (tabName === "history") refreshHistory();
+}
+
+function pad2(n) { return String(n).padStart(2, "0"); }
+function todayIso() {
+    const d = new Date();
+    return `${d.getFullYear()}-${pad2(d.getMonth()+1)}-${pad2(d.getDate())}`;
+}
+
+function getHistoryFilters() {
+    const dateEl = $("#historyDate");
+    const hs = $("#hourStart").value;
+    const he = $("#hourEnd").value;
+    return {
+        date: dateEl && dateEl.value ? dateEl.value : todayIso(),
+        hour_start: hs === "" || Number.isNaN(+hs) ? null : Math.min(23, Math.max(0, +hs | 0)),
+        hour_end:   he === "" || Number.isNaN(+he) ? null : Math.min(23, Math.max(0, +he | 0)),
+    };
+}
+
+async function refreshHistory() {
+    const summary = $("#historySummary");
+    const listEl = $("#historyList");
+    const hourlyEl = $("#historyHourly");
+    if (!listEl || !summary) return;
+
+    const f = getHistoryFilters();
+    const params = new URLSearchParams();
+    params.set("date", f.date);
+    if (f.hour_start != null) params.set("hour_start", String(f.hour_start));
+    if (f.hour_end   != null) params.set("hour_end",   String(f.hour_end));
+    params.set("limit", "500");
+
+    try {
+        listEl.innerHTML = "";
+        hourlyEl.innerHTML = "";
+        summary.textContent = i18n("history_summary_empty");
+        const res = await fetch("/api/history?" + params.toString());
+        if (!res.ok) throw new Error("HTTP " + res.status);
+        const data = await res.json();
+        renderHistory(data);
+    } catch (err) {
+        console.error(err);
+        listEl.innerHTML = `<div class="history-empty">${err.message || err}</div>`;
+    }
+}
+
+function renderHistory(data) {
+    const summary = $("#historySummary");
+    const listEl = $("#historyList");
+    const hourlyEl = $("#historyHourly");
+    if (!summary || !listEl || !hourlyEl) return;
+
+    const total = (data.total_detections | 0);
+    const uniq  = (data.unique_slots | 0);
+    if (total <= 0) {
+        summary.textContent = i18n("history_summary_empty");
+    } else {
+        summary.textContent = i18n("history_summary_with")
+            .replace("{total}", String(total))
+            .replace("{uniq}", String(uniq));
+    }
+
+    /* 24-hour bars */
+    hourlyEl.innerHTML = "";
+    const hourly = Array.isArray(data.hourly) ? data.hourly : [];
+    const maxCount = hourly.reduce((m, h) => Math.max(m, h.count | 0), 0);
+    hourly.forEach(h => {
+        const hh = pad2(h.hour | 0);
+        const count = h.count | 0;
+        const pct = maxCount > 0 ? Math.max(4, Math.round((count / maxCount) * 100)) : 0;
+        const el = document.createElement("div");
+        el.className = "hour-bar";
+        el.dataset.count = String(count);
+        el.style.height = (count > 0 ? pct : 2) + "%";
+        el.title = i18n("history_hour_bucket")
+            .replace("{hh}", hh)
+            .replace("{n}", String(count));
+        hourlyEl.appendChild(el);
+    });
+
+    /* Row list */
+    const rows = Array.isArray(data.rows) ? data.rows : [];
+    if (!rows.length) {
+        listEl.innerHTML = `<div class="history-empty">${i18n("history_no_data")}</div>`;
+        return;
+    }
+    const frag = document.createDocumentFragment();
+    rows.forEach(r => {
+        const iso = String(r.ts_local || "");
+        const dt = new Date(iso.includes("T") ? iso : new Date((r.unixtime|0) * 1000).toISOString());
+        const hh = pad2(dt.getHours());
+        const mm = pad2(dt.getMinutes());
+        const ss = pad2(dt.getSeconds());
+        const slot = (r.slot | 0);
+        const x = (r.x_mm | 0);
+        const y = (r.y_mm | 0);
+        const dist = Number(r.distance_mm) || 0;
+        const ang  = Number(r.angle_deg) || 0;
+        const spd  = (r.speed_cm_s | 0);
+
+        const row = document.createElement("div");
+        row.className = "detect";
+        row.innerHTML = `
+            <div class="detect-time">${hh}:${mm}:${ss}</div>
+            <div class="detect-slot s${Math.min(3, Math.max(1, slot))}">T${slot}</div>
+            <div class="detect-meta">
+                <span class="kv"><span>${i18n("history_xy")}:</span><b>(${x}, ${y})mm</b></span>
+                <span class="kv"><span>${i18n("angle")}:</span><b>${ang.toFixed(1)}°</b></span>
+                <span class="kv"><span>${i18n("speed")}:</span><b>${spd > 0 ? "+" : ""}${spd} cm/s</b></span>
+            </div>
+            <div class="detect-dist">${(dist/1000).toFixed(2)} m</div>
+        `;
+        frag.appendChild(row);
+    });
+    listEl.appendChild(frag);
+}
+
 /* ---------- Wiring up ---------- */
 function initUI() {
     /* Theme toggle */
@@ -818,7 +977,6 @@ function initUI() {
         localStorage.setItem("lang", State.lang);
         applyI18n();
         refreshPanels();
-        buildEditorInputs();
     });
 
     /* Tool toggles */
@@ -826,38 +984,22 @@ function initUI() {
     $("#chkTrails").addEventListener("change", e => State.options.trails = e.target.checked);
     $("#chkLabels").addEventListener("change", e => State.options.labels = e.target.checked);
 
-    /* Zone editor */
-    $("#btnEditZones").addEventListener("click", () => {
-        buildEditorInputs();
-        $("#zoneEditor").hidden = false;
-    });
-    $("#btnCancelZones").addEventListener("click", () => {
-        $("#zoneEditor").hidden = true;
-    });
-    $("#btnResetZones").addEventListener("click", () => {
-        DEFAULT_ZONES.forEach((def, idx) => {
-            const z = State.radar.zones[idx];
-            z.x1 = def.x1; z.y1 = def.y1; z.x2 = def.x2; z.y2 = def.y2;
-        });
-        buildEditorInputs();
-    });
-    $("#zoneEditor").addEventListener("submit", async (e) => {
-        e.preventDefault();
-        const payload = collectEditorPayload();
-        try {
-            const res = await fetch("/api/zones", {
-                method: "POST",
-                headers: { "Content-Type": "application/json" },
-                body: JSON.stringify(payload),
-            });
-            if (!res.ok) throw new Error("HTTP " + res.status);
-            toast(i18n("zone_saved"), "success");
-            $("#zoneEditor").hidden = true;
-        } catch (err) {
-            console.error(err);
-            toast(i18n("zone_save_error") + ": " + err.message, "error");
-        }
+    /* Tabs: Radar / History */
+    $$(".tab-btn").forEach(btn => {
+        btn.addEventListener("click", () => switchTab(btn.dataset.tab));
     });
+    State.activeTab = localStorage.getItem("activeTab") || "radar";
+    switchTab(State.activeTab);
+
+    /* History filters */
+    const dateEl = $("#historyDate");
+    if (dateEl) dateEl.value = todayIso();
+    if (dateEl) dateEl.addEventListener("change", () => refreshHistory());
+    const hs = $("#hourStart"), he = $("#hourEnd");
+    if (hs) hs.addEventListener("change", () => refreshHistory());
+    if (he) he.addEventListener("change", () => refreshHistory());
+    const btnRef = $("#btnRefreshHistory");
+    if (btnRef) btnRef.addEventListener("click", () => refreshHistory());
 
     /* Canvas resize */
     window.addEventListener("resize", resizeCanvas);

orangepi-server/static/style.css

@@ -184,6 +184,7 @@ input, button { font-family: inherit; color: inherit; }
     .app-main { padding: 12px; gap: 14px; }
     .status-chip span:last-child { display: none; }
     .status-chip { padding: 6px 8px; }
+    .legend { display: none !important; }
 }
 
 /* ---------- Panels ---------- */
@@ -460,6 +461,140 @@ input, button { font-family: inherit; color: inherit; }
     box-shadow: 0 4px 14px color-mix(in srgb, var(--accent-blue) 30%, transparent);
 }
 .btn-primary:hover { box-shadow: 0 6px 18px color-mix(in srgb, var(--accent-blue) 40%, transparent); }
+.btn-sm { padding: 6px 10px; font-size: 11px; border-radius: 8px; }
+
+/* Tabs (Radar / History) */
+.tabs-row {
+    display: flex; gap: 6px; padding: 6px;
+    background: var(--bg-elev-1);
+    border: 1px solid var(--border);
+    border-radius: var(--radius-lg);
+    margin-bottom: 12px;
+}
+.tab-btn {
+    flex: 1 1 0;
+    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
+    padding: 8px 12px;
+    background: transparent; color: var(--text-muted);
+    border: none; border-radius: 10px;
+    font-size: 13px; font-weight: 600; cursor: pointer;
+    transition: all .2s;
+}
+.tab-btn:hover { color: var(--text); }
+.tab-btn.tab-active {
+    background: var(--surface); color: var(--text);
+    border: 1px solid var(--border);
+    box-shadow: var(--shadow-sm);
+}
+.tab-dot { width: 8px; height: 8px; border-radius: 50%; display: inline-block; }
+.tab-panel { display: flex; flex-direction: column; gap: 16px; }
+
+/* History card + filters */
+.history-toolbar {
+    display: grid; grid-template-columns: auto 1fr; gap: 16px; align-items: start;
+    margin-bottom: 16px;
+}
+.history-toolbar-title h3 { margin-bottom: 4px; }
+.history-summary { font-size: 12px; color: var(--text-muted); }
+.history-filters {
+    display: flex; flex-wrap: wrap; gap: 10px; align-items: flex-end;
+    justify-content: flex-end;
+}
+.field { display: inline-flex; flex-direction: column; gap: 4px; }
+.field > span { font-size: 11px; color: var(--text-muted); font-weight: 600; }
+.field input {
+    height: 34px; padding: 0 10px;
+    border-radius: 8px; border: 1px solid var(--border);
+    background: var(--bg-elev-1); color: var(--text);
+    font-size: 12px; font-family: "JetBrains Mono", monospace;
+}
+.field-range .range { display: inline-flex; align-items: center; gap: 6px; }
+.field-range .range input { width: 68px; }
+.field-range .sep { color: var(--text-dim); font-size: 12px; }
+
+/* 24-hour bar summary */
+.history-hourly {
+    display: grid; grid-template-columns: repeat(24, 1fr);
+    gap: 3px; align-items: end;
+    height: 90px; margin-bottom: 18px;
+    padding: 8px 6px;
+    background: var(--bg-elev-1);
+    border: 1px solid var(--border);
+    border-radius: var(--radius-sm);
+}
+.hour-bar {
+    position: relative;
+    width: 100%;
+    background: linear-gradient(180deg, var(--accent-blue), color-mix(in srgb, var(--accent-mauve) 60%, var(--accent-blue)));
+    border-radius: 3px 3px 0 0;
+    min-height: 2px;
+    max-height: 100%;
+    transition: transform .2s;
+    cursor: help;
+}
+.hour-bar:hover { transform: scaleY(1.1); }
+.hour-bar[data-count="0"] { background: var(--bg-elev-2); opacity: .6; }
+.hour-bar[title]::after {
+    content: attr(title);
+    position: absolute; bottom: calc(100% + 6px); left: 50%;
+    transform: translateX(-50%);
+    background: var(--surface); border: 1px solid var(--border);
+    color: var(--text); font-size: 11px; padding: 2px 6px; border-radius: 6px;
+    white-space: nowrap; display: none; box-shadow: var(--shadow-sm);
+}
+.hour-bar:hover[title]::after { display: block; }
+
+/* Detection list items */
+.history-list {
+    display: flex; flex-direction: column; gap: 8px;
+    max-height: 560px; overflow: auto;
+    padding-right: 4px;
+}
+.history-empty {
+    padding: 22px 14px; text-align: center;
+    color: var(--text-muted); font-size: 13px;
+    border: 1px dashed var(--border); border-radius: 10px;
+}
+.detect {
+    display: grid; grid-template-columns: auto auto 1fr auto;
+    gap: 10px 14px; align-items: center;
+    padding: 10px 12px;
+    background: var(--bg-elev-1);
+    border: 1px solid var(--border);
+    border-radius: var(--radius-sm);
+    transition: background .2s;
+}
+.detect:hover { background: var(--bg-elev-2); }
+.detect-time {
+    font-family: "JetBrains Mono", monospace;
+    font-size: 12px; color: var(--accent-blue); font-weight: 700;
+}
+.detect-slot {
+    width: 36px; height: 36px; border-radius: 10px;
+    display: inline-flex; align-items: center; justify-content: center;
+    font-weight: 800; font-size: 14px;
+    border: 1px solid;
+}
+.detect-slot.s1 { background: color-mix(in srgb, var(--z1) 30%, transparent); color: var(--z1); border-color: color-mix(in srgb, var(--z1) 60%, transparent); }
+.detect-slot.s2 { background: color-mix(in srgb, var(--z2) 30%, transparent); color: var(--z2); border-color: color-mix(in srgb, var(--z2) 60%, transparent); }
+.detect-slot.s3 { background: color-mix(in srgb, var(--z3) 30%, transparent); color: var(--z3); border-color: color-mix(in srgb, var(--z3) 60%, transparent); }
+.detect-meta {
+    display: flex; flex-wrap: wrap; gap: 10px 14px;
+    font-size: 12px; color: var(--text-muted);
+}
+.detect-meta .kv { display: inline-flex; gap: 4px; align-items: baseline; }
+.detect-meta .kv b { color: var(--text); font-weight: 600; font-family: "JetBrains Mono", monospace; }
+.detect-dist {
+    font-weight: 700; color: var(--text); font-size: 14px;
+    font-family: "JetBrains Mono", monospace;
+}
+
+@media (max-width: 600px) {
+    .history-toolbar { grid-template-columns: 1fr; }
+    .history-filters { justify-content: flex-start; }
+    .detect { grid-template-columns: auto 1fr auto; row-gap: 6px; }
+    .detect-time { grid-column: 1 / -1; }
+}
 
 /* Toast */
 .toast-container {

orangepi-server/templates/index.html

@@ -130,6 +130,23 @@
     <!-- ======= RIGHT / BOTTOM: INFO PANELS ======= -->
     <section class="panel panel-side">
 
+        <!-- ===================================================== -->
+        <!--  TOP TABS: Radar / Lịch sử                            -->
+        <!-- ===================================================== -->
+        <div class="tabs-row" role="tablist" aria-label="Views">
+            <button role="tab" class="tab-btn tab-active" data-tab="radar"   aria-selected="true">
+                <span class="tab-dot" style="background: var(--accent-green);"></span>
+                <span data-i18n="tab_radar">Radar</span>
+            </button>
+            <button role="tab" class="tab-btn" data-tab="history" aria-selected="false">
+                <span class="tab-dot" style="background: var(--accent-blue);"></span>
+                <span data-i18n="tab_history">Lịch sử</span>
+            </button>
+        </div>
+
+        <!-- Tab: Radar (stats + targets + zones) -->
+        <div class="tab-panel" data-tab-panel="radar">
+
             <!-- Stats card -->
             <div class="card stats-card">
                 <h3 data-i18n="statistics">Thống kê</h3>
@@ -161,24 +178,41 @@
                 </div>
             </div>
 
-        <!-- Zones list + editor -->
+            <!-- Zones list (editor removed per user request — defaults are final) -->
             <div class="card zones-card">
-            <div class="card-header-row">
                 <h3 data-i18n="zones">Zones</h3>
-                <button class="btn-link" id="btnEditZones" data-i18n="edit_zones">Sửa zones</button>
-            </div>
                 <div class="zones-list" id="zonesList"></div>
-
-            <!-- Zone editor (hidden by default) -->
-            <form class="zone-editor" id="zoneEditor" hidden>
-                <div class="editor-title" data-i18n="zone_editor_title">Chỉnh sửa tọa độ zone (mm)</div>
-                <div class="editor-grid" id="editorGrid"></div>
-                <div class="editor-actions">
-                    <button type="button" class="btn btn-ghost" id="btnCancelZones" data-i18n="cancel">Hủy</button>
-                    <button type="button" class="btn btn-ghost" id="btnResetZones" data-i18n="reset_default">Mặc định</button>
-                    <button type="submit" class="btn btn-primary" data-i18n="save_and_apply">Lưu & Áp dụng</button>
             </div>
-            </form>
+        </div>
+
+        <!-- Tab: History (SQLite-backed detections with date/hour filters) -->
+        <div class="tab-panel" data-tab-panel="history" hidden>
+            <div class="card history-card">
+                <div class="history-toolbar">
+                    <div class="history-toolbar-title">
+                        <h3 data-i18n="history_title">Lịch sử phát hiện</h3>
+                        <div class="history-summary" id="historySummary" data-i18n="history_summary_empty">Chưa có dữ liệu</div>
+                    </div>
+                    <div class="history-filters">
+                        <label class="field">
+                            <span data-i18n="history_date">Ngày</span>
+                            <input type="date" id="historyDate">
+                        </label>
+                        <label class="field field-range">
+                            <span data-i18n="history_hour">Giờ</span>
+                            <div class="range">
+                                <input type="number" id="hourStart" min="0" max="23" step="1" placeholder="0">
+                                <span class="sep">→</span>
+                                <input type="number" id="hourEnd" min="0" max="23" step="1" placeholder="23">
+                            </div>
+                        </label>
+                        <button class="btn btn-primary btn-sm" id="btnRefreshHistory" data-i18n="history_refresh">Tải lại</button>
+                    </div>
+                </div>
+
+                <div class="history-hourly" id="historyHourly"><!-- 24-hour bar summary --></div>
+                <div class="history-list" id="historyList"><!-- Detection cards --></div>
+            </div>
         </div>
     </section>
 

orangepi-server/visualizer.py

@@ -32,10 +32,15 @@ from typing import List, Set
 # ------------------------------------------------------------
 try:
     import websockets
-    from fastapi import FastAPI, HTTPException, WebSocket, WebSocketDisconnect
+    from fastapi import FastAPI, HTTPException, Query, WebSocket, WebSocketDisconnect
     from fastapi.responses import FileResponse
     from fastapi.staticfiles import StaticFiles
     import aiohttp
+    try:
+        import aiosqlite  # async SQLite driver (>=0.18)
+    except ImportError:  # allow fallback to stdlib sqlite3 for dev
+        aiosqlite = None
+        import sqlite3
 except ImportError as e:
     print(f"Lỗi: Thiếu thư viện. Cần cài đặt trước: pip install -r requirements.txt")
     print(f"Chi tiết: {e}")
@@ -81,6 +86,204 @@ class RadarState:
     last_update: float = 0.0
     esp32_connected: bool = False
 
+
+# ============================================================
+# SQLite-backed detection history store
+#
+# We deduplicate writes by slot: when a slot stays continuously valid
+# (e.g. a person standing still for 60 seconds), we only persist 1 row
+# every SAMPLE_EVERY_N_SECONDS instead of every heartbeat frame, which
+# keeps the database small on a Raspberry/Orange Pi flash filesystem.
+# Switching a slot from INVALID -> VALID always writes immediately so
+# entry events have accurate timestamps.
+# ============================================================
+class TargetStore:
+    SAMPLE_EVERY_N_SECONDS = 2.0  # ~30 writes/slot/minute max
+
+    def __init__(self, db_path: Path):
+        self.db_path = Path(db_path)
+        self._conn_sync: "sqlite3.Connection | None" = None
+        self._conn_async = None
+        self._last_written_ts: dict[int, float] = {}
+
+    # ---------- init / close ----------
+    async def init_db(self):
+        # Create parent folder if needed.
+        self.db_path.parent.mkdir(parents=True, exist_ok=True)
+        schema_sql = """
+        CREATE TABLE IF NOT EXISTS detections (
+            id           INTEGER PRIMARY KEY AUTOINCREMENT,
+            ts_utc       TEXT    NOT NULL,                    -- ISO8601 (UTC)
+            ts_local     TEXT    NOT NULL,                    -- ISO8601 (local tz)
+            unixtime     REAL    NOT NULL,                    -- seconds since epoch
+            slot         INTEGER NOT NULL CHECK (slot IN (1,2,3)),
+            x_mm         INTEGER NOT NULL,
+            y_mm         INTEGER NOT NULL,
+            speed_cm_s   INTEGER NOT NULL,
+            distance_mm  REAL    NOT NULL,
+            angle_deg    REAL    NOT NULL
+        );
+        CREATE INDEX IF NOT EXISTS idx_detections_dayhour
+            ON detections(slot, unixtime);
+        """
+        if aiosqlite is not None:
+            self._conn_async = await aiosqlite.connect(str(self.db_path))
+            await self._conn_async.executescript(schema_sql)
+            await self._conn_async.commit()
+        else:
+            self._conn_sync = sqlite3.connect(str(self.db_path), check_same_thread=False)
+            self._conn_sync.executescript(schema_sql)
+            self._conn_sync.commit()
+
+    async def close(self):
+        if self._conn_async is not None:
+            try:
+                await self._conn_async.close()
+            finally:
+                self._conn_async = None
+        if self._conn_sync is not None:
+            try:
+                self._conn_sync.close()
+            finally:
+                self._conn_sync = None
+
+    # ---------- internal runner (async preferred, sync fallback) ----------
+    async def _run_write(self, sql: str, params: tuple) -> None:
+        if aiosqlite is not None and self._conn_async is not None:
+            await self._conn_async.execute(sql, params)
+            await self._conn_async.commit()
+            return
+        if self._conn_sync is None:
+            return
+        def _job():
+            assert self._conn_sync is not None
+            self._conn_sync.execute(sql, params)
+            self._conn_sync.commit()
+        await asyncio.to_thread(_job)
+
+    async def _run_read(self, sql: str, params: tuple) -> list[dict]:
+        if aiosqlite is not None and self._conn_async is not None:
+            conn = self._conn_async
+            conn.row_factory = aiosqlite.Row  # type: ignore[union-attr]
+            async with conn.execute(sql, params) as cur:
+                rows = await cur.fetchall()
+            return [dict(r) for r in rows]
+        if self._conn_sync is None:
+            return []
+        def _job():
+            assert self._conn_sync is not None
+            self._conn_sync.row_factory = sqlite3.Row
+            cur = self._conn_sync.execute(sql, params)
+            return [dict(r) for r in cur.fetchall()]
+        return await asyncio.to_thread(_job)
+
+    # ---------- write API (dedup per slot) ----------
+    async def maybe_record(self, targets: list[Target], now_ts: float) -> None:
+        import datetime as _dt
+        for t in targets:
+            if not t.valid:
+                # Slot went invalid; reset its timer so the *next* valid
+                # event flushes immediately (captures re-entry into the room).
+                self._last_written_ts.pop(t.slot, None)
+                continue
+            prev = self._last_written_ts.get(t.slot, None)
+            is_first_valid_entry = prev is None
+            enough_time_passed = (
+                prev is None or (now_ts - prev) >= self.SAMPLE_EVERY_N_SECONDS
+            )
+            if not (is_first_valid_entry or enough_time_passed):
+                continue
+            self._last_written_ts[t.slot] = now_ts
+            utc = _dt.datetime.fromtimestamp(now_ts, tz=_dt.timezone.utc)
+            local = _dt.datetime.fromtimestamp(now_ts).astimezone()
+            sql = (
+                "INSERT INTO detections"
+                " (ts_utc, ts_local, unixtime, slot, x_mm, y_mm,"
+                "  speed_cm_s, distance_mm, angle_deg)"
+                " VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)"
+            )
+            await self._run_write(
+                sql,
+                (
+                    utc.isoformat(timespec="seconds"),
+                    local.isoformat(timespec="seconds"),
+                    round(now_ts, 3),
+                    int(t.slot),
+                    int(t.x_mm),
+                    int(t.y_mm),
+                    int(t.speed_cm_s),
+                    round(float(t.distance_mm), 2),
+                    round(float(t.angle_deg), 4),
+                ),
+            )
+
+    # ---------- read API ----------
+    async def query(
+        self,
+        date_iso: str,
+        hour_start: int | None = None,
+        hour_end: int | None = None,
+        limit: int = 500,
+    ) -> dict:
+        """date_iso = YYYY-MM-DD in the server LOCAL timezone (matches what
+        <input type=date> returns from a browser in the same tz)."""
+        import datetime as _dt
+        try:
+            day = _dt.date.fromisoformat(date_iso)
+        except ValueError as e:
+            raise HTTPException(status_code=400, detail=f"date không hợp lệ: {e}")
+        day_start_local = _dt.datetime.combine(day, _dt.time(0, 0, 0)).astimezone()
+        day_end_local = day_start_local + _dt.timedelta(days=1)
+        unixtime_start = day_start_local.timestamp()
+        unixtime_end = day_end_local.timestamp()
+        where = ["unixtime >= ? AND unixtime < ?"]
+        params: list = [unixtime_start, unixtime_end]
+        if hour_start is not None and 0 <= hour_start <= 23:
+            where.append("CAST(strftime('%H', ts_local) AS INTEGER) >= ?")
+            params.append(int(hour_start))
+        if hour_end is not None and 0 <= hour_end <= 23:
+            where.append("CAST(strftime('%H', ts_local) AS INTEGER) <= ?")
+            params.append(int(hour_end))
+
+        # 1) Raw rows (newest first)
+        rows_sql = (
+            "SELECT id, ts_local, unixtime, slot, x_mm, y_mm,"
+            "       speed_cm_s, distance_mm, angle_deg"
+            "  FROM detections WHERE " + " AND ".join(where) +
+            " ORDER BY unixtime DESC LIMIT ?"
+        )
+        rows = await self._run_read(rows_sql, tuple(params + [int(limit)]))
+
+        # 2) 24 hourly buckets (0..23) → count+unique slots for the day filter.
+        hour_sql = (
+            "SELECT CAST(strftime('%H', ts_local) AS INTEGER) AS hh,"
+            "       COUNT(*) AS n, COUNT(DISTINCT slot) AS uniq_slots"
+            "  FROM detections WHERE " + " AND ".join(where) +
+            " GROUP BY hh ORDER BY hh ASC"
+        )
+        buckets_raw = await self._run_read(hour_sql, tuple(params))
+        hourly = [{"hour": h, "count": 0, "uniq_slots": 0} for h in range(24)]
+        for b in buckets_raw:
+            hourly[int(b["hh"])]["count"] = int(b["n"])
+            hourly[int(b["hh"])]["uniq_slots"] = int(b["uniq_slots"])
+
+        total = sum(h["count"] for h in hourly)
+        unique_slots_total = len({r["slot"] for r in rows}) if rows else 0
+        return {
+            "date": date_iso,
+            "filters": {
+                "hour_start": hour_start,
+                "hour_end": hour_end,
+                "limit": limit,
+            },
+            "total_detections": total,
+            "unique_slots": unique_slots_total,
+            "hourly": hourly,
+            "rows": rows,
+        }
+
+
+
     def to_json(self) -> dict:
         """Serialize to something the browser can render."""
         now = time.time()
@@ -182,6 +385,17 @@ class RadarState:
         self.frames_received += 1
         self.last_update = now
 
+        # Persist valid targets into the SQLite history (dedup per slot).
+        # We reference the singleton STORE from the FastAPI lifecycle; this
+        # indirection keeps RadarState pure (no knowledge of DB engine).
+        store = globals().get("STORE")
+        if store is not None:
+            try:
+                await store.maybe_record(self.targets, now)
+            except Exception:
+                # Never let a DB write failure break the realtime radar loop.
+                pass
+
 
 # ============================================================
 # Global app state
@@ -372,13 +586,25 @@ async def broadcast_to_browsers():
 BASE_DIR = Path(__file__).resolve().parent
 TEMPLATES_DIR = BASE_DIR / "templates"
 STATIC_DIR = BASE_DIR / "static"
+DATA_DIR = BASE_DIR / "data"
 STATIC_DIR.mkdir(exist_ok=True)
 TEMPLATES_DIR.mkdir(exist_ok=True)
+DATA_DIR.mkdir(exist_ok=True)
+
+DB_PATH = DATA_DIR / "detections.sqlite3"
+STORE: "TargetStore | None" = None  # initialized in lifespan, exported for RadarState
 
 
 @asynccontextmanager
 async def lifespan(app: FastAPI):
-    """Start background tasks when app starts, cancel them on shutdown."""
+    """Open the SQLite store, start background tasks, close store on shutdown."""
+    global STORE
+    STORE = TargetStore(DB_PATH)
+    try:
+        await STORE.init_db()
+    except Exception as e:
+        log.warning(f"Không thể khởi tạo SQLite history (tiếp tục chạy radar without DB): {e}")
+        STORE = None
     tasks = [
         asyncio.create_task(esp32_ws_forever(ESP32_HOST)),
         asyncio.create_task(heartbeat_broadcast()),
@@ -387,6 +613,11 @@ async def lifespan(app: FastAPI):
     for t in tasks:
         t.cancel()
     await asyncio.gather(*tasks, return_exceptions=True)
+    if STORE is not None:
+        try:
+            await STORE.close()
+        finally:
+            STORE = None
 
 
 app = FastAPI(
@@ -430,6 +661,30 @@ async def update_zones(payload: list):
     return await post_zones_to_esp32(ESP32_HOST, payload)
 
 
+@app.get("/api/history")
+async def get_history(
+    date: str = Query(..., description="YYYY-MM-DD theo múi giờ máy chủ (local tz)"),
+    hour_start: int | None = Query(None, ge=0, le=23),
+    hour_end: int | None = Query(None, ge=0, le=23),
+    limit: int = Query(500, ge=1, le=10000),
+):
+    """Trả về lịch sử detect target (raw + 24 buckets theo giờ)."""
+    if STORE is None:
+        raise HTTPException(status_code=503, detail="SQLite history store chưa sẵn sàng")
+    try:
+        return await STORE.query(
+            date_iso=date,
+            hour_start=hour_start,
+            hour_end=hour_end,
+            limit=limit,
+        )
+    except HTTPException:
+        raise
+    except Exception as e:
+        log.exception(f"GET /api/history failed: {e}")
+        raise HTTPException(status_code=500, detail=f"Lỗi truy vấn history: {e}")
+
+
 # --- WebSocket route for browsers -----------------------------
 @app.websocket("/ws")
 async def browser_ws_endpoint(ws: WebSocket):