Add edit check-in functionality

app/routers/checkins.py

@@ -33,6 +33,7 @@ async def new_checkin_page(request: Request, user: User = Depends(get_current_us
     return templates.TemplateResponse(request, "checkin_new.html", {
         "user": user,
         "today": date.today().isoformat(),
+        "action": "/checkins/new",
     })
 
 
@@ -63,3 +64,63 @@ async def new_checkin(
         await session.commit()
 
     return RedirectResponse(url="/checkins", status_code=303)
+
+
+@router.get("/checkins/{checkin_id}/edit", response_class=HTMLResponse)
+async def edit_checkin_page(
+    request: Request,
+    checkin_id: int,
+    user: User = Depends(get_current_user),
+):
+    async with async_session() as session:
+        result = await session.execute(
+            select(Checkin).where(
+                Checkin.id == checkin_id,
+                Checkin.user_id == user.id,
+            )
+        )
+        checkin = result.scalar_one_or_none()
+        if not checkin:
+            return templates.TemplateResponse(request, "404.html", status_code=404)
+
+    return templates.TemplateResponse(request, "checkin_new.html", {
+        "user": user,
+        "checkin": checkin,
+        "action": f"/checkins/{checkin_id}/edit",
+    })
+
+
+@router.post("/checkins/{checkin_id}/edit")
+async def edit_checkin(
+    request: Request,
+    checkin_id: int,
+    user: User = Depends(get_current_user),
+    date: str = Form(),
+    feeling: str = Form(default=""),
+    weight_lb: float = Form(default=None),
+    calories: int = Form(default=None),
+    steps: int = Form(default=None),
+    sleep_hours: float = Form(default=None),
+    notes: str = Form(default=""),
+):
+    async with async_session() as session:
+        result = await session.execute(
+            select(Checkin).where(
+                Checkin.id == checkin_id,
+                Checkin.user_id == user.id,
+            )
+        )
+        checkin = result.scalar_one_or_none()
+        if not checkin:
+            return templates.TemplateResponse(request, "404.html", status_code=404)
+
+        checkin.date = date
+        checkin.feeling = feeling
+        checkin.weight_lb = weight_lb
+        checkin.calories = calories
+        checkin.steps = steps
+        checkin.sleep_hours = sleep_hours
+        checkin.notes = notes
+        await session.commit()
+
+    return RedirectResponse(url="/checkins", status_code=303)

app/templates/checkin_new.html

@@ -1,46 +1,49 @@
 {% extends "base.html" %}
-{% block title %}Morning Check-in{% endblock %}
+{% block title %}{% if checkin %}Edit{% else %}New{% endif %} Morning Check-in{% endblock %}
 {% block content %}
-<h1>Morning Check-in</h1>
+<h1>{% if checkin %}Edit{% else %}New{% endif %} Morning Check-in</h1>
 <p><small>All fields are optional — fill in whatever you have each morning.</small></p>
-<form method="post" action="/checkins/new">
+<form method="post" action="{{ action }}">
     <label>
         Date
-        <input type="date" name="date" value="{{ today }}" required>
+        <input type="date" name="date" value="{{ checkin.date if checkin else today }}" required>
         <small>Morning of this check-in</small>
     </label>
     <label>
         Feeling
-        <input type="text" name="feeling" placeholder="e.g., Good, Tired, Sore">
+        <input type="text" name="feeling" value="{{ checkin.feeling or '' }}" placeholder="e.g., Good, Tired, Sore">
         <small>How are you feeling this morning?</small>
     </label>
     <div class="grid">
         <label>
             Weight (lb)
-            <input type="number" name="weight_lb" step="0.1">
+            <input type="number" name="weight_lb" step="0.1" value="{{ checkin.weight_lb or '' }}">
             <small>Morning weight</small>
         </label>
         <label>
             Calories
-            <input type="number" name="calories">
+            <input type="number" name="calories" value="{{ checkin.calories or '' }}">
             <small>Yesterday's total</small>
         </label>
         <label>
             Steps
-            <input type="number" name="steps">
+            <input type="number" name="steps" value="{{ checkin.steps or '' }}">
             <small>Yesterday's total</small>
         </label>
         <label>
             Sleep (hours)
-            <input type="number" name="sleep_hours" step="0.5">
+            <input type="number" name="sleep_hours" step="0.5" value="{{ checkin.sleep_hours or '' }}">
             <small>Last night</small>
         </label>
     </div>
     <label>
         Notes
-        <textarea name="notes" rows="3" placeholder="Anything else to note?"></textarea>
+        <textarea name="notes" rows="3" placeholder="Anything else to note?">{{ checkin.notes or '' }}</textarea>
         <small>Optional notes about yesterday or today</small>
     </label>
-    <button type="submit">Save Check-in</button>
+    <button type="submit">{% if checkin %}Update{% else %}Save{% endif %} Check-in</button>
 </form>
+{% if checkin %}
+<a href="/checkins">Back to Check-ins</a>
+{% endif %}
 {% endblock %}

app/templates/checkins.html

@@ -15,6 +15,7 @@
             <th>Calories <small>(yesterday)</small></th>
             <th>Steps <small>(yesterday)</small></th>
             <th>Sleep</th>
+            <th></th>
         </tr>
     </thead>
     <tbody>
@@ -26,6 +27,7 @@
             <td>{{ c.calories or '—' }}</td>
             <td>{{ c.steps or '—' }}</td>
             <td>{{ c.sleep_hours or '—' }}</td>
+            <td><a href="/checkins/{{ c.id }}/edit">Edit</a></td>
         </tr>
         {% endfor %}
     </tbody>