Add optional due time to todos, fix date not being optional

Backend:
- Add due_time (TIME, nullable) column to todos model + migration 015
- Add due_time to Create/Update/Response schemas

Frontend:
- Add due_time to Todo type
- TodoForm: add time input, convert empty strings to null before
  sending (fixes date appearing required — Pydantic rejected '' as date)
- TodoItem: display clock icon + time when due_time is set

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/alembic/versions/015_add_todo_due_time.py

@@ -0,0 +1,24 @@
+"""Add due_time column to todos
+
+Revision ID: 015
+Revises: 014
+Create Date: 2026-02-23
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = "015"
+down_revision = "014"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.add_column("todos", sa.Column("due_time", sa.Time(), nullable=True))
+
+
+def downgrade() -> None:
+    op.drop_column("todos", "due_time")

backend/app/models/todo.py

@@ -1,6 +1,6 @@
-from sqlalchemy import String, Text, Boolean, Date, Integer, ForeignKey, func
+from sqlalchemy import String, Text, Boolean, Date, Time, Integer, ForeignKey, func
 from sqlalchemy.orm import Mapped, mapped_column, relationship
-from datetime import datetime, date
+from datetime import datetime, date, time
 from typing import Optional
 from app.database import Base
 
@@ -13,6 +13,7 @@ class Todo(Base):
     description: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
     priority: Mapped[str] = mapped_column(String(20), default="medium")
     due_date: Mapped[Optional[date]] = mapped_column(Date, nullable=True)
+    due_time: Mapped[Optional[time]] = mapped_column(Time, nullable=True)
     completed: Mapped[bool] = mapped_column(Boolean, default=False)
     completed_at: Mapped[Optional[datetime]] = mapped_column(nullable=True)
     category: Mapped[Optional[str]] = mapped_column(String(100), nullable=True)

backend/app/schemas/todo.py

@@ -1,5 +1,5 @@
 from pydantic import BaseModel, ConfigDict
-from datetime import datetime, date
+from datetime import datetime, date, time
 from typing import Optional, Literal
 
 TodoPriority = Literal["none", "low", "medium", "high"]
@@ -10,6 +10,7 @@ class TodoCreate(BaseModel):
     description: Optional[str] = None
     priority: TodoPriority = "medium"
     due_date: Optional[date] = None
+    due_time: Optional[time] = None
     category: Optional[str] = None
     recurrence_rule: Optional[str] = None
     project_id: Optional[int] = None
@@ -20,6 +21,7 @@ class TodoUpdate(BaseModel):
     description: Optional[str] = None
     priority: Optional[TodoPriority] = None
     due_date: Optional[date] = None
+    due_time: Optional[time] = None
     completed: Optional[bool] = None
     category: Optional[str] = None
     recurrence_rule: Optional[str] = None
@@ -32,6 +34,7 @@ class TodoResponse(BaseModel):
     description: Optional[str]
     priority: str
     due_date: Optional[date]
+    due_time: Optional[time]
     completed: bool
     completed_at: Optional[datetime]
     category: Optional[str]

frontend/src/components/todos/TodoForm.tsx

@@ -29,17 +29,28 @@ export default function TodoForm({ todo, onClose }: TodoFormProps) {
     description: todo?.description || '',
     priority: todo?.priority || 'medium',
     due_date: todo?.due_date || '',
+    due_time: todo?.due_time ? todo.due_time.slice(0, 5) : '',
     category: todo?.category || '',
     recurrence_rule: todo?.recurrence_rule || '',
   });
 
   const mutation = useMutation({
     mutationFn: async (data: typeof formData) => {
+      // Convert empty strings to null for optional fields
+      const payload = {
+        title: data.title,
+        description: data.description || null,
+        priority: data.priority,
+        due_date: data.due_date || null,
+        due_time: data.due_time || null,
+        category: data.category || null,
+        recurrence_rule: data.recurrence_rule || null,
+      };
       if (todo) {
-        const response = await api.put(`/todos/${todo.id}`, data);
+        const response = await api.put(`/todos/${todo.id}`, payload);
         return response.data;
       } else {
-        const response = await api.post('/todos', data);
+        const response = await api.post('/todos', payload);
         return response.data;
       }
     },
@@ -104,6 +115,18 @@ export default function TodoForm({ todo, onClose }: TodoFormProps) {
                 </Select>
               </div>
 
+              <div className="space-y-2">
+                <Label htmlFor="category">Category</Label>
+                <Input
+                  id="category"
+                  value={formData.category}
+                  onChange={(e) => setFormData({ ...formData, category: e.target.value })}
+                  placeholder="e.g., Work, Personal"
+                />
+              </div>
+            </div>
+
+            <div className="grid grid-cols-2 gap-4">
               <div className="space-y-2">
                 <Label htmlFor="due_date">Due Date</Label>
                 <Input
@@ -113,18 +136,17 @@ export default function TodoForm({ todo, onClose }: TodoFormProps) {
                   onChange={(e) => setFormData({ ...formData, due_date: e.target.value })}
                 />
               </div>
-            </div>
 
-            <div className="grid grid-cols-2 gap-4">
               <div className="space-y-2">
-                <Label htmlFor="category">Category</Label>
+                <Label htmlFor="due_time">Due Time</Label>
                 <Input
-                  id="category"
+                  id="due_time"
-                  value={formData.category}
+                  type="time"
-                  onChange={(e) => setFormData({ ...formData, category: e.target.value })}
+                  value={formData.due_time}
-                  placeholder="e.g., Work, Personal"
+                  onChange={(e) => setFormData({ ...formData, due_time: e.target.value })}
                 />
               </div>
+            </div>
 
             <div className="space-y-2">
               <Label htmlFor="recurrence">Recurrence</Label>
@@ -140,7 +162,6 @@ export default function TodoForm({ todo, onClose }: TodoFormProps) {
               </Select>
             </div>
           </div>
-          </div>
 
           <SheetFooter>
             <Button type="button" variant="outline" onClick={onClose}>

frontend/src/components/todos/TodoItem.tsx

@@ -1,6 +1,6 @@
 import { useMutation, useQueryClient } from '@tanstack/react-query';
 import { toast } from 'sonner';
-import { Trash2, Pencil, Calendar, AlertCircle, RefreshCw } from 'lucide-react';
+import { Trash2, Pencil, Calendar, Clock, AlertCircle, RefreshCw } from 'lucide-react';
 import { format, isToday, isPast, parseISO, startOfDay } from 'date-fns';
 import api from '@/lib/api';
 import type { Todo } from '@/types';
@@ -138,6 +138,13 @@ export default function TodoItem({ todo, onEdit }: TodoItemProps) {
             </div>
           )}
 
+          {todo.due_time && (
+            <div className="flex items-center gap-1 text-xs text-muted-foreground">
+              <Clock className="h-3 w-3" />
+              {todo.due_time.slice(0, 5)}
+            </div>
+          )}
+
           {showResetInfo && (
             <div className="flex items-center gap-1 text-xs text-purple-400">
               <RefreshCw className="h-3 w-3" />

frontend/src/types/index.ts

@@ -27,6 +27,7 @@ export interface Todo {
   completed_at?: string;
   priority: 'none' | 'low' | 'medium' | 'high';
   due_date?: string;
+  due_time?: string;
   category?: string;
   recurrence_rule?: string;
   reset_at?: string;