Track age and weight

README.md

@@ -1,6 +1,7 @@
 # puppy-tracker
 
-A tiny offline-first PWA for tracking your puppy's sleep, meals, pees, and poos.
+A tiny offline-first PWA for tracking your puppy's sleep, meals, pees, poos, and
+weight.
 The browser is the primary client; a small Go server provides a shared
 source-of-truth and sync between devices.
 
@@ -16,6 +17,12 @@ source-of-truth and sync between devices.
   merged set.
 - Service worker bypasses cache for `/api/*` so writes always hit the server
   when online; static assets are still cached for offline use.
+- The puppy's name and birthday are a shared profile stored on the host
+  (`GET`/`PUT /api/config`), so a new device picks them up automatically instead
+  of being configured per-client. The client caches the last-seen values in
+  `localStorage` for offline/instant paint and reconciles with the server by
+  last-write-wins on `updatedAt`. The age shown in the header (in weeks and
+  months) is derived from the birthday.
 
 A status pill in the header shows `syncing…` / `synced 2m ago` / `pending` /
 `sync error` / `offline`. Tap it to force-sync.

server/main.go

@@ -22,6 +22,7 @@ type Event struct {
 	At        int64   `json:"at"`
 	Note      string  `json:"note"`
 	PhotoID   string  `json:"photoId,omitempty"`
+	Weight    float64 `json:"weight,omitempty"` // kilograms, for "weight" events
 	UpdatedAt int64   `json:"updatedAt"`
 	Deleted   bool    `json:"deleted,omitempty"`
 }
@@ -30,6 +31,84 @@ var uuidRE = regexp.MustCompile(`^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4
 
 func validUUID(s string) bool { return uuidRE.MatchString(s) }
 
+var birthdayRE = regexp.MustCompile(`^\d{4}-\d{2}-\d{2}$`)
+
+func validBirthday(s string) bool { return s == "" || birthdayRE.MatchString(s) }
+
+// Config is the shared puppy profile (name + birthday). It lives on the host so
+// every client sees the same values without configuring each device. UpdatedAt
+// drives last-write-wins, mirroring how events sync.
+type Config struct {
+	Name      string `json:"name"`
+	Birthday  string `json:"birthday"`
+	UpdatedAt int64  `json:"updatedAt"`
+}
+
+type ConfigStore struct {
+	path string
+	mu   sync.Mutex
+	cfg  Config
+}
+
+func newConfigStore(path string) (*ConfigStore, error) {
+	cs := &ConfigStore{path: path}
+	f, err := os.Open(path)
+	if err != nil {
+		if errors.Is(err, fs.ErrNotExist) {
+			return cs, nil
+		}
+		return nil, err
+	}
+	defer f.Close()
+	if err := json.NewDecoder(f).Decode(&cs.cfg); err != nil && !errors.Is(err, io.EOF) {
+		return nil, err
+	}
+	return cs, nil
+}
+
+func (cs *ConfigStore) get() Config {
+	cs.mu.Lock()
+	defer cs.mu.Unlock()
+	return cs.cfg
+}
+
+// merge applies an incoming config with last-write-wins by UpdatedAt and
+// returns the resulting stored config (which the caller sends back).
+func (cs *ConfigStore) merge(in Config) (Config, error) {
+	cs.mu.Lock()
+	defer cs.mu.Unlock()
+	if in.UpdatedAt > cs.cfg.UpdatedAt {
+		cs.cfg = in
+		if err := cs.saveLocked(); err != nil {
+			return cs.cfg, err
+		}
+	}
+	return cs.cfg, nil
+}
+
+// Caller must hold cs.mu.
+func (cs *ConfigStore) saveLocked() error {
+	if err := os.MkdirAll(filepath.Dir(cs.path), 0o755); err != nil {
+		return err
+	}
+	tmp := cs.path + ".tmp"
+	f, err := os.Create(tmp)
+	if err != nil {
+		return err
+	}
+	enc := json.NewEncoder(f)
+	enc.SetIndent("", "  ")
+	if err := enc.Encode(cs.cfg); err != nil {
+		f.Close()
+		os.Remove(tmp)
+		return err
+	}
+	if err := f.Close(); err != nil {
+		return err
+	}
+	return os.Rename(tmp, cs.path)
+}
+
 type Store struct {
 	path string
 	mu   sync.Mutex
@@ -143,6 +222,11 @@ func main() {
 		log.Fatalf("load store: %v", err)
 	}
 
+	configStore, err := newConfigStore(filepath.Join(filepath.Dir(*dataPath), "config.json"))
+	if err != nil {
+		log.Fatalf("load config: %v", err)
+	}
+
 	photosDir := filepath.Join(filepath.Dir(*dataPath), "photos")
 	if err := os.MkdirAll(photosDir, 0o755); err != nil {
 		log.Fatalf("mkdir photos: %v", err)
@@ -174,6 +258,43 @@ func main() {
 		})
 	})
 
+	// GET  /api/config — return the shared puppy profile.
+	// PUT  /api/config — update it (last-write-wins by updatedAt).
+	mux.HandleFunc("/api/config", func(w http.ResponseWriter, r *http.Request) {
+		writeConfig := func(c Config) {
+			w.Header().Set("Content-Type", "application/json")
+			w.Header().Set("Cache-Control", "no-store")
+			_ = json.NewEncoder(w).Encode(c)
+		}
+		switch r.Method {
+		case http.MethodGet:
+			writeConfig(configStore.get())
+		case http.MethodPut, http.MethodPost:
+			var in Config
+			if err := json.NewDecoder(io.LimitReader(r.Body, 1<<16)).Decode(&in); err != nil {
+				http.Error(w, "bad json: "+err.Error(), http.StatusBadRequest)
+				return
+			}
+			in.Name = strings.TrimSpace(in.Name)
+			if len(in.Name) > 100 {
+				in.Name = in.Name[:100]
+			}
+			if !validBirthday(in.Birthday) {
+				http.Error(w, "invalid birthday (want YYYY-MM-DD)", http.StatusBadRequest)
+				return
+			}
+			merged, err := configStore.merge(in)
+			if err != nil {
+				log.Printf("config save: %v", err)
+				http.Error(w, "server error", http.StatusInternalServerError)
+				return
+			}
+			writeConfig(merged)
+		default:
+			http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
+		}
+	})
+
 	mux.HandleFunc("/healthz", func(w http.ResponseWriter, r *http.Request) {
 		w.Write([]byte("ok"))
 	})

src/app.js

@@ -2,6 +2,7 @@
   "use strict";
 
   const STORAGE_KEY = "puppy-tracker:events:v1";
+  const CONFIG_KEY  = "puppy-tracker:config:v1";
   const SYNC_URL = "api/events/sync";
   const SYNC_DEBOUNCE_MS = 1200;
   const SYNC_POLL_MS = 60_000;
@@ -12,6 +13,7 @@
     "eat":         "Ate",
     "pee":         "Pee",
     "poo":         "Poo",
+    "weight":      "Weigh-in",
   };
 
   // ---------- photos: IndexedDB store ----------
@@ -198,7 +200,56 @@
     return loadAll().filter(e => !e.deleted);
   }
 
-  function addEvent(type, note, at, photoId) {
+  // ---------- config (puppy name + birthday) ----------
+  // The shared profile lives on the host so every client sees the same values.
+  // localStorage is just a cache for instant paint + offline; the server is the
+  // source of truth, reconciled by last-write-wins on updatedAt (see syncConfig).
+  function loadConfig() {
+    try {
+      const parsed = JSON.parse(localStorage.getItem(CONFIG_KEY));
+      if (!parsed || typeof parsed !== "object") return { name: "", birthday: "", updatedAt: 0 };
+      return {
+        name: parsed.name || "",
+        birthday: parsed.birthday || "",
+        updatedAt: Number.isFinite(parsed.updatedAt) ? parsed.updatedAt : 0,
+      };
+    } catch {
+      return { name: "", birthday: "", updatedAt: 0 };
+    }
+  }
+
+  function saveConfig(cfg) {
+    localStorage.setItem(CONFIG_KEY, JSON.stringify(cfg));
+  }
+
+  // Age in whole days / weeks / calendar months from a "YYYY-MM-DD" birthday.
+  // Returns null for a missing/invalid/future birthday.
+  function ageParts(birthday) {
+    if (!birthday) return null;
+    const [y, mo, d] = birthday.split("-").map(Number);
+    if (!y || !mo || !d) return null;
+    const birth = startOfDay(new Date(y, mo - 1, d));
+    const now   = startOfDay(new Date());
+    if (birth > now) return null;
+    const days  = Math.floor((now - birth) / 86_400_000);
+    const weeks = Math.floor(days / 7);
+    let months = (now.getFullYear() - birth.getFullYear()) * 12 +
+                 (now.getMonth() - birth.getMonth());
+    if (now.getDate() < birth.getDate()) months--;
+    if (months < 0) months = 0;
+    return { days, weeks, months };
+  }
+
+  function formatAge(birthday) {
+    const a = ageParts(birthday);
+    if (!a) return "";
+    const wk = `${a.weeks} week${a.weeks === 1 ? "" : "s"}`;
+    if (a.months < 1) return `${wk} old`;
+    const mo = `${a.months} month${a.months === 1 ? "" : "s"}`;
+    return `${wk} · ${mo} old`;
+  }
+
+  function addEvent(type, note, at, photoId, weight) {
     const events = loadAll();
     const now = Date.now();
     events.push({
@@ -207,6 +258,7 @@
       at: Number.isFinite(at) ? at : now,
       note: note || "",
       photoId: photoId || "",
+      weight: Number.isFinite(weight) ? weight : undefined,
       updatedAt: now,
     });
     saveAll(events);
@@ -283,6 +335,11 @@
     return `${h}h ${m}m`;
   }
 
+  // kg with up to 2 decimals, trailing zeros stripped (5.20 -> "5.2 kg").
+  function formatWeight(kg) {
+    return `${Math.round(kg * 100) / 100} kg`;
+  }
+
   function formatRelative(ts) {
     if (!ts) return "—";
     const diff = Date.now() - ts;
@@ -646,7 +703,12 @@
         <span class="label">${EVENT_LABELS[ev.type] || ev.type}</span>
         <span class="note"></span>
       `;
-      li.querySelector(".note").textContent = ev.note || "";
+      const noteEl = li.querySelector(".note");
+      if (ev.type === "weight" && Number.isFinite(ev.weight)) {
+        noteEl.textContent = ev.note ? `${formatWeight(ev.weight)} · ${ev.note}` : formatWeight(ev.weight);
+      } else {
+        noteEl.textContent = ev.note || "";
+      }
       li.addEventListener("click", () => openEditDialog(ev));
 
       if (ev.photoId) {
@@ -859,6 +921,129 @@
     drawCountsChart(days);
   }
 
+  // ---------- weight ----------
+  // Pick a "nice" kg axis that frames the data with a little headroom rather
+  // than forcing 0-based (a puppy going 5→8 kg would otherwise look flat).
+  function niceWeightAxis(min, max) {
+    if (!(max > 0)) return { lo: 0, hi: 1, steps: 1 };
+    if (min === max) { min = Math.max(0, min - 0.5); max = max + 0.5; }
+    const span = max - min;
+    let lo = Math.max(0, min - span * 0.15);
+    let hi = max + span * 0.15;
+    const rawStep = (hi - lo) / 4;
+    const mag  = Math.pow(10, Math.floor(Math.log10(rawStep)));
+    const norm = rawStep / mag;
+    const step = (norm <= 1 ? 1 : norm <= 2 ? 2 : norm <= 2.5 ? 2.5 : norm <= 5 ? 5 : 10) * mag;
+    lo = Math.floor(lo / step) * step;
+    hi = Math.ceil(hi / step) * step;
+    return { lo, hi, steps: Math.max(1, Math.round((hi - lo) / step)) };
+  }
+
+  function drawWeightChart(weights) {
+    const svg = document.getElementById("chart-weight");
+    const W = 320, H = 180;
+    const ML = 30, MR = 8, MT = 10, MB = 24;
+    const innerW = W - ML - MR;
+    const innerH = H - MT - MB;
+
+    if (weights.length === 0) { svg.innerHTML = ""; return; }
+
+    const vals = weights.map(w => w.weight);
+    const { lo, hi, steps } = niceWeightAxis(Math.min(...vals), Math.max(...vals));
+
+    const t0 = weights[0].at;
+    const t1 = weights[weights.length - 1].at;
+    const tSpan = t1 - t0;
+    const xOf = (t) => tSpan > 0 ? ML + ((t - t0) / tSpan) * innerW : ML + innerW / 2;
+    const yOf = (v) => MT + innerH * (1 - (v - lo) / (hi - lo));
+
+    const parts = [];
+    for (let i = 0; i <= steps; i++) {
+      const v = lo + (hi - lo) * i / steps;
+      const y = yOf(v);
+      parts.push(`<line class="grid" x1="${ML}" y1="${y}" x2="${W - MR}" y2="${y}"/>`);
+      parts.push(`<text x="${ML - 4}" y="${y + 3}" text-anchor="end">${Math.round(v * 10) / 10}</text>`);
+    }
+
+    if (weights.length > 1) {
+      const d = weights
+        .map((w, i) => `${i === 0 ? "M" : "L"}${xOf(w.at).toFixed(1)} ${yOf(w.weight).toFixed(1)}`)
+        .join(" ");
+      parts.push(`<path class="weight-line" d="${d}"/>`);
+    }
+
+    weights.forEach(w => {
+      const title = `${new Date(w.at).toLocaleDateString(undefined, { weekday: "short", month: "short", day: "numeric" })} — ${formatWeight(w.weight)}`;
+      parts.push(
+        `<circle class="weight-dot" cx="${xOf(w.at).toFixed(1)}" cy="${yOf(w.weight).toFixed(1)}" r="3.5">` +
+        `<title>${escapeText(title)}</title></circle>`
+      );
+    });
+
+    const fmtX = (t) => new Date(t).toLocaleDateString(undefined, { month: "short", day: "numeric" });
+    parts.push(`<text x="${ML}" y="${H - MB + 16}" text-anchor="start">${escapeText(fmtX(t0))}</text>`);
+    if (tSpan > 0) {
+      parts.push(`<text x="${W - MR}" y="${H - MB + 16}" text-anchor="end">${escapeText(fmtX(t1))}</text>`);
+    }
+
+    svg.innerHTML = parts.join("");
+  }
+
+  function renderWeight(events) {
+    const weights = events
+      .filter(e => e.type === "weight" && Number.isFinite(e.weight))
+      .sort((a, b) => a.at - b.at);
+
+    const empty    = document.getElementById("weight-empty");
+    const latestEl = document.getElementById("weight-latest");
+    const changeEl = document.getElementById("weight-change");
+    const list     = document.getElementById("weight-list");
+
+    list.innerHTML = "";
+    changeEl.classList.remove("up", "down");
+
+    if (weights.length === 0) {
+      empty.hidden = false;
+      latestEl.textContent = "—";
+      changeEl.textContent = "—";
+      drawWeightChart([]);
+      return;
+    }
+    empty.hidden = true;
+
+    const latest = weights[weights.length - 1];
+    latestEl.textContent = formatWeight(latest.weight);
+
+    if (weights.length >= 2) {
+      const d = latest.weight - weights[weights.length - 2].weight;
+      const rounded = Math.round(d * 100) / 100;
+      const arrow = d > 0 ? "▲" : d < 0 ? "▼" : "▬";
+      changeEl.textContent = `${arrow} ${d > 0 ? "+" : ""}${rounded} kg`;
+      changeEl.classList.toggle("up", d > 0);
+      changeEl.classList.toggle("down", d < 0);
+    } else {
+      changeEl.textContent = "—";
+    }
+
+    // Most-recent-first log; tap a row to edit that weigh-in.
+    for (const w of [...weights].reverse()) {
+      const li = document.createElement("li");
+      li.className = "ww weight-ww";
+      const date = document.createElement("span");
+      date.className = "ww-range";
+      date.textContent = new Date(w.at).toLocaleDateString(undefined, { month: "short", day: "numeric" });
+      const val = document.createElement("span");
+      val.className = "ww-dur";
+      val.textContent = formatWeight(w.weight);
+      li.appendChild(date);
+      li.appendChild(val);
+      li.addEventListener("click", () => openEditDialog(w));
+      list.appendChild(li);
+    }
+
+    drawWeightChart(weights);
+  }
+
   function renderDayBar() {
     const day = selectedDay();
     const isToday = ymd(day) === ymd(new Date());
@@ -872,8 +1057,20 @@
     }
   }
 
+  function renderHeader() {
+    const cfg   = loadConfig();
+    const title = document.getElementById("app-title");
+    const ageEl = document.getElementById("puppy-age");
+    title.textContent = cfg.name ? `🐶 ${cfg.name}` : "🐶 Puppy Tracker";
+    document.title = cfg.name ? `${cfg.name} · Puppy Tracker` : "Puppy Tracker";
+    const ageText = formatAge(cfg.birthday);
+    ageEl.textContent = ageText;
+    ageEl.hidden = !ageText;
+  }
+
   function render() {
     const events = live();
+    renderHeader();
     renderDayBar();
     renderBigClock(events);
     renderStats(events);
@@ -882,6 +1079,7 @@
     renderSleepWindows(events);
     renderWakeWindows(events);
     renderWeekly(events);
+    renderWeight(events);
     renderHistory(events);
   }
 
@@ -978,6 +1176,50 @@
     }
   }
 
+  // ---------- config sync ----------
+  // Reconcile the local config cache with the host. Whichever side has the
+  // newer updatedAt wins: adopt the server's copy, or push ours if it's ahead
+  // (e.g. edited on this device while another client hadn't changed it). This
+  // self-heals a failed push — the local copy stays newer and re-pushes next tick.
+  async function syncConfig() {
+    if (!navigator.onLine) return;
+    const local = loadConfig();
+    try {
+      const res = await fetch("api/config");
+      if (!res.ok) throw new Error(`HTTP ${res.status}`);
+      const body = await res.json();
+      const server = {
+        name: body.name || "",
+        birthday: body.birthday || "",
+        updatedAt: Number.isFinite(body.updatedAt) ? body.updatedAt : 0,
+      };
+      if (server.updatedAt > local.updatedAt) {
+        saveConfig(server);
+        renderHeader();
+      } else if (local.updatedAt > server.updatedAt) {
+        await pushConfig(local);
+      }
+    } catch (err) {
+      console.warn("config sync failed:", err);
+    }
+  }
+
+  async function pushConfig(cfg) {
+    if (!navigator.onLine) return;
+    const res = await fetch("api/config", {
+      method: "PUT",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify(cfg),
+    });
+    if (!res.ok) throw new Error(`HTTP ${res.status}`);
+    const body = await res.json();
+    // Adopt the server's answer if it turned out to be newer (another client won).
+    if (Number.isFinite(body.updatedAt) && body.updatedAt > cfg.updatedAt) {
+      saveConfig({ name: body.name || "", birthday: body.birthday || "", updatedAt: body.updatedAt });
+      renderHeader();
+    }
+  }
+
   // ---------- dialogs ----------
   const noteDialog       = document.getElementById("note-dialog");
   const noteForm         = document.getElementById("note-form");
@@ -989,6 +1231,8 @@
   const notePhotoBtn     = document.getElementById("note-photo-btn");
   const notePhotoClear   = document.getElementById("note-photo-clear");
   const notePhotoPreview = document.getElementById("note-photo-preview");
+  const noteWeightField  = document.getElementById("note-weight-field");
+  const noteWeight       = document.getElementById("note-weight");
   let pendingType        = null;
   let notePhotoBlob      = null; // pending blob for the dialog (not yet committed)
   let notePhotoURL       = null; // current preview object URL
@@ -1010,9 +1254,12 @@
     noteDate.value = toDateInput(now);
     noteTime.value = toTimeInput(now);
     noteTitle.textContent = `Log ${EVENT_LABELS[type]}`;
+    const isWeight = type === "weight";
+    noteWeightField.hidden = !isWeight;
+    noteWeight.value = "";
     clearNotePhoto();
     noteDialog.showModal();
-    setTimeout(() => noteInput.focus(), 50);
+    setTimeout(() => (isWeight ? noteWeight : noteInput).focus(), 50);
   }
 
   function noteDialogAt() {
@@ -1047,6 +1294,12 @@
   document.getElementById("note-save").addEventListener("click", async (e) => {
     e.preventDefault();
     if (!pendingType) { noteDialog.close(); return; }
+    let weight;
+    if (pendingType === "weight") {
+      weight = parseFloat(noteWeight.value);
+      if (!(weight > 0)) { alert("Enter a weight in kilograms."); return; }
+      weight = Math.round(weight * 100) / 100;
+    }
     let photoId = "";
     if (notePhotoBlob) {
       photoId = uuid();
@@ -1056,7 +1309,7 @@
         return;
       }
     }
-    addEvent(pendingType, noteInput.value.trim(), noteDialogAt(), photoId);
+    addEvent(pendingType, noteInput.value.trim(), noteDialogAt(), photoId, weight);
     pendingType = null;
     clearNotePhoto();
     noteDialog.close();
@@ -1079,6 +1332,8 @@
   const editPhotoBtn     = document.getElementById("edit-photo-btn");
   const editPhotoClear   = document.getElementById("edit-photo-clear");
   const editPhotoPreview = document.getElementById("edit-photo-preview");
+  const editWeightField  = document.getElementById("edit-weight-field");
+  const editWeight       = document.getElementById("edit-weight");
   let editingId          = null;
   let editPhotoId        = "";      // current photoId for this event
   let editPhotoBlob      = null;    // new blob chosen in this session
@@ -1102,6 +1357,8 @@
     editDate.value = toDateInput(ev.at);
     editTime.value = toTimeInput(ev.at);
     editNote.value = ev.note || "";
+    editWeightField.hidden = ev.type !== "weight";
+    editWeight.value = (ev.type === "weight" && Number.isFinite(ev.weight)) ? ev.weight : "";
     editPhotoId = ev.photoId || "";
     editPhotoCleared = false;
     clearEditPhotoLocalState();
@@ -1150,6 +1407,11 @@
       at: Number.isFinite(newAt) ? newAt : undefined,
       note: editNote.value.trim(),
     };
+    if (!editWeightField.hidden) {
+      const kg = parseFloat(editWeight.value);
+      if (!(kg > 0)) { alert("Enter a weight in kilograms."); return; }
+      patch.weight = Math.round(kg * 100) / 100;
+    }
     if (editPhotoBlob) {
       const newId = uuid();
       try { await putPhoto(newId, editPhotoBlob, false); }
@@ -1181,6 +1443,44 @@
     editDialog.close();
   });
 
+  // Settings dialog (puppy name + birthday)
+  const settingsDialog   = document.getElementById("settings-dialog");
+  const settingsForm     = document.getElementById("settings-form");
+  const settingsName     = document.getElementById("settings-name");
+  const settingsBirthday = document.getElementById("settings-birthday");
+
+  function openSettingsDialog() {
+    const cfg = loadConfig();
+    settingsName.value     = cfg.name;
+    settingsBirthday.value = cfg.birthday;
+    settingsDialog.showModal();
+    setTimeout(() => settingsName.focus(), 50);
+  }
+
+  document.getElementById("settings-btn").addEventListener("click", openSettingsDialog);
+
+  settingsForm.querySelector('button[value="save"]').addEventListener("click", async (e) => {
+    e.preventDefault();
+    const cfg = {
+      name: settingsName.value.trim(),
+      birthday: settingsBirthday.value,
+      updatedAt: Date.now(),
+    };
+    saveConfig(cfg);       // cache locally for instant + offline paint
+    renderHeader();
+    settingsDialog.close();
+    try {
+      await pushConfig(cfg);
+    } catch (err) {
+      console.warn("config save failed:", err);
+      // Kept locally; syncConfig retries automatically once the host is reachable.
+    }
+  });
+  settingsForm.querySelector('button[value="cancel"]').addEventListener("click", (e) => {
+    e.preventDefault();
+    settingsDialog.close();
+  });
+
   // ---------- wiring ----------
   document.querySelectorAll("button.action").forEach(btn => {
     btn.addEventListener("click", () => openNoteDialog(btn.dataset.type));
@@ -1207,12 +1507,13 @@
   statusEl.title = "Click to sync now";
   statusEl.addEventListener("click", () => { clearTimeout(syncTimer); sync(); });
 
-  window.addEventListener("online", () => { setStatus(); sync(); });
+  window.addEventListener("online", () => { setStatus(); sync(); syncConfig(); });
   window.addEventListener("offline", () => setStatus());
 
   // Live-update relative times and (eventually) sync status text.
   setInterval(() => {
     const evs = live();
+    renderHeader();
     renderBigClock(evs);
     renderStats(evs);
     renderLasts(evs);
@@ -1228,6 +1529,7 @@
 
   // Periodic pull from server so other clients' changes show up.
   setInterval(sync, SYNC_POLL_MS);
+  setInterval(syncConfig, SYNC_POLL_MS);
 
   // Service worker
   if ("serviceWorker" in navigator) {
@@ -1240,4 +1542,5 @@
   setStatus();
   render();
   sync();
+  syncConfig();
 })();

src/index.html

@@ -12,8 +12,14 @@
   </head>
   <body>
     <header>
-      <h1>🐶 Puppy Tracker</h1>
+      <div class="title">
+        <h1 id="app-title">🐶 Puppy Tracker</h1>
+        <div id="puppy-age" class="puppy-age" hidden></div>
+      </div>
+      <div class="header-actions">
+        <button type="button" id="settings-btn" class="ghost icon-btn" aria-label="Settings" title="Settings">⚙️</button>
         <div id="online-status" class="status-pill"></div>
+      </div>
     </header>
 
     <main>
@@ -31,6 +37,7 @@
           <button class="action eat" data-type="eat">🍽️ Ate</button>
           <button class="action pee" data-type="pee">💧 Pee</button>
           <button class="action poo" data-type="poo">💩 Poo</button>
+          <button class="action weight" data-type="weight">⚖️ Weigh-in</button>
         </div>
       </section>
 
@@ -115,6 +122,26 @@
         </div>
       </section>
 
+      <section class="weight">
+        <h2>Weight</h2>
+        <div class="weight-summary">
+          <div class="stat">
+            <div class="stat-label">Latest</div>
+            <div class="stat-value" id="weight-latest">—</div>
+          </div>
+          <div class="stat">
+            <div class="stat-label">Since last</div>
+            <div class="stat-value" id="weight-change">—</div>
+          </div>
+        </div>
+        <div class="chart">
+          <div class="chart-title">Weight (kg)</div>
+          <svg id="chart-weight" class="chart-svg" viewBox="0 0 320 180" role="img" aria-label="Weight in kilograms over time"></svg>
+        </div>
+        <ul id="weight-list" class="wake-list"></ul>
+        <p id="weight-empty" class="empty">No weigh-ins logged yet.</p>
+      </section>
+
       <section class="history">
         <h2>History</h2>
         <ul id="event-list" class="event-list"></ul>
@@ -122,6 +149,22 @@
       </section>
     </main>
 
+    <dialog id="settings-dialog">
+      <form method="dialog" id="settings-form">
+        <h3>Puppy settings</h3>
+        <label>Name
+          <input type="text" id="settings-name" placeholder="e.g. Rex" autocomplete="off" />
+        </label>
+        <label>Birthday
+          <input type="date" id="settings-birthday" />
+        </label>
+        <menu>
+          <button value="cancel" class="ghost">Cancel</button>
+          <button value="save" id="settings-save">Save</button>
+        </menu>
+      </form>
+    </dialog>
+
     <dialog id="note-dialog">
       <form method="dialog" id="note-form">
         <h3 id="note-title">Add note</h3>
@@ -132,6 +175,9 @@
             <button type="button" id="note-time-now" class="ghost">Now</button>
           </div>
         </label>
+        <label id="note-weight-field" hidden>Weight (kg)
+          <input type="number" id="note-weight" inputmode="decimal" step="0.01" min="0" placeholder="e.g. 5.2" />
+        </label>
         <label>Note
           <textarea id="note-input" rows="4" placeholder="e.g. pee was instant, poo took 5min, ate 300g raw food"></textarea>
         </label>
@@ -157,6 +203,9 @@
             <input type="time" id="edit-time" lang="en-GB" />
           </div>
         </label>
+        <label id="edit-weight-field" hidden>Weight (kg)
+          <input type="number" id="edit-weight" inputmode="decimal" step="0.01" min="0" />
+        </label>
         <label>Note
           <textarea id="edit-note" rows="4"></textarea>
         </label>

src/style.css

@@ -9,7 +9,9 @@
   --eat: #ff9b3d;
   --pee: #ffd23f;
   --poo: #8a5a3b;
+  --weight: #2bb3a3;
   --danger: #d64545;
+  --gain: #2e9e5b;
   --border: #e9e6f5;
   --radius: 12px;
   --shadow: 0 1px 2px rgba(20, 14, 60, 0.05), 0 4px 16px rgba(20, 14, 60, 0.05);
@@ -57,6 +59,32 @@ h1 {
   margin: 0;
 }
 
+.title {
+  display: flex;
+  flex-direction: column;
+  gap: 2px;
+  min-width: 0;
+}
+
+.puppy-age {
+  font-size: 0.8rem;
+  color: var(--muted);
+  font-variant-numeric: tabular-nums;
+}
+
+.header-actions {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  flex-shrink: 0;
+}
+
+.icon-btn {
+  padding: 6px 10px;
+  font-size: 1.1rem;
+  line-height: 1;
+}
+
 h2 {
   font-size: 1rem;
   text-transform: uppercase;
@@ -156,6 +184,7 @@ button.action.sleep { background: var(--sleep); }
 button.action.eat   { background: var(--eat); }
 button.action.pee   { background: var(--pee); color: #2b240a; }
 button.action.poo   { background: var(--poo); }
+button.action.weight { background: var(--weight); }
 
 button.ghost {
   background: transparent;
@@ -227,7 +256,7 @@ button.danger { background: var(--danger); }
 
 .history-controls label { color: var(--muted); font-size: 0.85rem; }
 
-input[type="date"], input[type="datetime-local"], textarea {
+input[type="date"], input[type="datetime-local"], input[type="text"], input[type="number"], textarea {
   font: inherit;
   background: var(--bg);
   color: var(--text);
@@ -313,6 +342,7 @@ textarea { resize: vertical; }
 .event[data-type="eat"] .dot { background: var(--eat); }
 .event[data-type="pee"] .dot { background: var(--pee); }
 .event[data-type="poo"] .dot { background: var(--poo); }
+.event[data-type="weight"] .dot { background: var(--weight); }
 
 .event .time { font-variant-numeric: tabular-nums; color: var(--muted); min-width: 60px; }
 .event .label { font-weight: 600; min-width: 110px; }
@@ -459,6 +489,19 @@ dialog menu {
 .chart-svg .bar-pee   { fill: var(--pee); }
 .chart-svg .bar-poo   { fill: var(--poo); }
 .chart-svg .bar-eat   { fill: var(--eat); }
+.chart-svg .weight-line { stroke: var(--weight); stroke-width: 2; fill: none; }
+.chart-svg .weight-dot  { fill: var(--weight); }
+
+.weight-summary {
+  display: grid;
+  grid-template-columns: repeat(2, 1fr);
+  gap: 10px;
+  margin-bottom: 16px;
+}
+.weight-summary .stat-value.up   { color: var(--gain); }
+.weight-summary .stat-value.down { color: var(--danger); }
+.ww.weight-ww { cursor: pointer; }
+.ww.weight-ww .ww-dur { text-align: right; }
 
 .legend {
   display: flex;

src/sw.js

@@ -1,4 +1,4 @@
-const CACHE = "puppy-tracker-v1";
+const CACHE = "puppy-tracker-v4";
 const PHOTO_CACHE = "puppy-tracker-photos-v1";
 const ASSETS = [
   "./",