Add multi-user auth, admin panel, and timezone support; rename to Yolkbook

- Rename app from Eggtracker to Yolkbook throughout - Add JWT-based authentication (python-jose, passlib/bcrypt) - Add users table; all data tables gain user_id FK for full data isolation - Super admin credentials sourced from ADMIN_USERNAME/ADMIN_PASSWORD env vars, synced on every startup; orphaned rows auto-assigned to admin post-migration - Login page with self-registration; JWT stored in localStorage (30-day expiry) - Admin panel (/admin): list users, reset passwords, disable/enable, delete, and impersonate (Login As) with Return to Admin banner - Settings modal (gear icon in nav): timezone selector and change password - Timezone stored per-user; stats date windows computed in user's timezone; date input setToday() respects user timezone via Intl API - migrate_v2.sql for existing single-user installs - Auto-migration adds timezone column to users on startup - Updated README with full setup, auth, admin, and migration docs Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-03-17 23:19:29 -07:00
parent 7d50af0054
commit aa12648228
31 changed files with 1572 additions and 140 deletions
--- a/README.md
+++ b/README.md
@@ -1,16 +1,19 @@
-# Eggtracker
+# Yolkbook

-A self-hosted web app for backyard chicken keepers to track egg production, flock size, feed costs, and egg economics over time.
+A self-hosted, multi-user web app for backyard chicken keepers to track egg production, flock size, feed costs, and egg economics over time.

 ## Features

- **Dashboard** — at-a-glance stats: total eggs, 7/30-day totals, average eggs per day and per hen
+- **Dashboard** — at-a-glance stats: total eggs, 7/30-day totals, average eggs per day and per hen, cost per egg and per dozen
 - **Daily log** — record egg collections with one entry per day
 - **History** — browse, edit, and delete past egg collection records
 - **Flock management** — track changes to your flock size over time so per-hen averages stay accurate
 - **Feed tracking** — log feed purchases (bags + price per bag)
 - **Budget** — cost per egg and cost per dozen, all-time and over the last 30 days
 - **Monthly summary** — month-by-month breakdown of production, averages, feed cost, and cost per egg
+- **Multi-user** — each user has their own isolated data; self-registration on the login page
+- **Admin panel** — view all users, reset passwords, disable/enable accounts, delete accounts, and log in as any user
+- **Timezone support** — each user sets their own timezone so dates and stat windows are always accurate

 ## Tech Stack

@@ -38,49 +41,118 @@ A self-hosted web app for backyard chicken keepers to track egg production, floc

 2. Create a `.env` file in the project root:
   ```env
+   # MySQL
   MYSQL_ROOT_PASSWORD=your_root_password
   MYSQL_DATABASE=eggtracker
   MYSQL_USER=eggtracker
-   MYSQL_PASSWORD=your_password
+   MYSQL_PASSWORD=your_db_password
+
+   # Super admin account (created/synced automatically on every startup)
+   ADMIN_USERNAME=admin
+   ADMIN_PASSWORD=your_admin_password
+
+   # JWT signing secret — generate with: openssl rand -hex 32
+   JWT_SECRET=your_long_random_secret
   ```

 3. Start the stack:
   ```bash
-   docker compose up -d
+   docker compose up -d --build
   ```

-4. Open your browser at `http://localhost:8056`
+4. Open your browser at `http://localhost:8056/login` and sign in with the admin credentials you set in `.env`.

-The database schema is applied automatically on first start via `mysql/init.sql`.
+The database schema is applied automatically on first start via `mysql/init.sql`. The admin user is created (or synced) automatically every time the API starts.
+
+## Authentication
+
+- **Login / Register** — the landing page (`/login`) has both a sign-in form and a self-registration link so users can create their own accounts.
+- **JWT tokens** — stored in `localStorage`, valid for 30 days.
+- **Admin password** — always sourced from the `ADMIN_PASSWORD` env var. Changing it in `.env` and restarting will update the admin's password.
+
+## Admin Panel
+
+Accessible at `/admin` for admin accounts. Features:
+
+| Action | Description |
+|--------|-------------|
+| Reset password | Set a new password for any user |
+| Disable / Enable | Block or restore a user's access |
+| Delete | Permanently remove a user and all their data |
+| Login As | Impersonate a user to view or edit their data directly |
+
+When impersonating a user, an amber banner appears in the nav with a **Return to Admin** button.
+
+## User Settings
+
+The gear icon (⚙) in the top-right nav opens the Settings panel:
+
+- **Timezone** — choose from a full list of IANA timezones or click *Detect automatically*. Affects what "today" is when pre-filling date fields and the 30-day/7-day windows on the dashboard and budget pages.
+- **Change Password** — update your own password (requires current password).
+
+## Migrating an Existing Install (pre-multi-user)
+
+If you have an existing single-user install, run the migration script before rebuilding:
+
+```bash
+# 1. Run the migration while the database is still running
+docker compose exec db mysql -u root -p"${MYSQL_ROOT_PASSWORD}" eggtracker < mysql/migrate_v2.sql
+
+# 2. Rebuild and restart
+docker compose up -d --build
+```
+
+All existing data will be automatically assigned to the admin account on first startup.

 ## API

 The FastAPI backend is available at `/api`. Interactive docs (Swagger UI) are at `/api/docs`.

 | Prefix           | Description                              |
-|---------------|--------------------------|
+|------------------|------------------------------------------|
+| `/api/auth`      | Login, register, change password, timezone |
+| `/api/admin`     | User management (admin only)             |
 | `/api/eggs`      | Egg collection records                   |
 | `/api/flock`     | Flock size history                       |
 | `/api/feed`      | Feed purchase records                    |
-| `/api/stats`  | Dashboard, budget, and monthly summary stats |
+| `/api/other`     | Other purchases (bedding, snacks, etc.)  |
+| `/api/stats`     | Dashboard, budget, and monthly summary   |
+
+All data endpoints require a valid JWT (`Authorization: Bearer <token>`). Data is always scoped to the authenticated user.

 ## Project Structure

 ```
-eggtracker/
+yolkbook/
 ├── backend/
-│   ├── main.py          # FastAPI app entry point
+│   ├── main.py           # FastAPI app entry point + startup seeding
+│   ├── auth.py           # JWT utilities, password hashing, auth dependencies
 │   ├── models.py         # SQLAlchemy models
 │   ├── schemas.py        # Pydantic schemas
 │   ├── database.py       # DB connection
-│   ├── routers/         # Route handlers (eggs, flock, feed, stats)
+│   ├── routers/
+│   │   ├── auth_router.py  # /api/auth — login, register, settings
+│   │   ├── admin.py        # /api/admin — user management
+│   │   ├── eggs.py
+│   │   ├── flock.py
+│   │   ├── feed.py
+│   │   ├── other.py
+│   │   └── stats.py
 │   ├── requirements.txt
 │   └── Dockerfile
 ├── nginx/
 │   ├── html/             # Frontend (HTML, CSS, JS)
+│   │   ├── login.html
+│   │   ├── admin.html
+│   │   ├── index.html    # Dashboard
+│   │   ├── js/
+│   │   │   ├── api.js    # Shared fetch helpers
+│   │   │   └── auth.js   # Auth utilities, nav, settings modal
+│   │   └── css/style.css
 │   └── nginx.conf
 ├── mysql/
-│   └── init.sql         # Schema applied on first start
+│   ├── init.sql          # Schema for fresh installs
+│   └── migrate_v2.sql    # Migration for pre-multi-user installs
 ├── docker-compose.yml
 └── .env                  # Secrets — not committed
 ```
--- a/backend/auth.py
+++ b/backend/auth.py
@@ -0,0 +1,72 @@
+import os
+from datetime import datetime, timedelta, timezone
+from typing import Optional
+
+from jose import JWTError, jwt
+from passlib.context import CryptContext
+from fastapi import Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordBearer
+from sqlalchemy.orm import Session
+
+from database import get_db
+from models import User
+
+SECRET_KEY = os.environ["JWT_SECRET"]
+ALGORITHM = "HS256"
+ACCESS_TOKEN_EXPIRE_DAYS = 30
+
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/api/auth/login")
+
+
+def verify_password(plain_password: str, hashed_password: str) -> bool:
+    return pwd_context.verify(plain_password, hashed_password)
+
+
+def hash_password(password: str) -> str:
+    return pwd_context.hash(password)
+
+
+def create_access_token(user_id: int, username: str, is_admin: bool, user_timezone: str = "UTC") -> str:
+    expire = datetime.now(timezone.utc) + timedelta(days=ACCESS_TOKEN_EXPIRE_DAYS)
+    payload = {
+        "sub": str(user_id),
+        "username": username,
+        "is_admin": is_admin,
+        "timezone": user_timezone,
+        "exp": expire,
+    }
+    return jwt.encode(payload, SECRET_KEY, algorithm=ALGORITHM)
+
+
+async def get_current_user(
+    token: str = Depends(oauth2_scheme),
+    db: Session = Depends(get_db),
+) -> User:
+    credentials_exception = HTTPException(
+        status_code=status.HTTP_401_UNAUTHORIZED,
+        detail="Could not validate credentials",
+        headers={"WWW-Authenticate": "Bearer"},
+    )
+    try:
+        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
+        user_id_str: Optional[str] = payload.get("sub")
+        if user_id_str is None:
+            raise credentials_exception
+        user_id = int(user_id_str)
+    except (JWTError, ValueError):
+        raise credentials_exception
+
+    user = db.get(User, user_id)
+    if user is None or user.is_disabled:
+        raise credentials_exception
+    return user
+
+
+async def get_current_admin(current_user: User = Depends(get_current_user)) -> User:
+    if not current_user.is_admin:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="Admin access required",
+        )
+    return current_user
--- a/backend/main.py
+++ b/backend/main.py
@@ -1,11 +1,81 @@
+import os
+import logging
+from contextlib import asynccontextmanager
+
 from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
+from sqlalchemy import select, update, text

+from database import Base, engine, SessionLocal
+from models import User, EggCollection, FlockHistory, FeedPurchase, OtherPurchase
+from auth import hash_password
 from routers import eggs, flock, feed, stats, other
+from routers import auth_router, admin

-app = FastAPI(title="Eggtracker API")
+logger = logging.getLogger("yolkbook")
+
+
+def _seed_admin():
+    """Create or update the admin user from environment variables.
+    Also assigns any records with NULL user_id to the admin (post-migration).
+    """
+    admin_username = os.environ["ADMIN_USERNAME"]
+    admin_password = os.environ["ADMIN_PASSWORD"]
+
+    with SessionLocal() as db:
+        admin_user = db.scalars(
+            select(User).where(User.username == admin_username)
+        ).first()
+
+        if admin_user is None:
+            admin_user = User(
+                username=admin_username,
+                hashed_password=hash_password(admin_password),
+                is_admin=True,
+            )
+            db.add(admin_user)
+            db.commit()
+            db.refresh(admin_user)
+            logger.info("Admin user '%s' created.", admin_username)
+        else:
+            # Always sync password + admin flag from env vars
+            admin_user.hashed_password = hash_password(admin_password)
+            admin_user.is_admin = True
+            db.commit()
+
+        # Assign orphaned records (from pre-migration data) to admin
+        for model in [EggCollection, FlockHistory, FeedPurchase, OtherPurchase]:
+            db.execute(
+                update(model)
+                .where(model.user_id == None)  # noqa: E711
+                .values(user_id=admin_user.id)
+            )
+        db.commit()
+
+
+def _run_migrations():
+    """Apply incremental schema changes that create_all won't handle on existing tables."""
+    with SessionLocal() as db:
+        # v2.1 — timezone column on users
+        try:
+            db.execute(text(
+                "ALTER TABLE users ADD COLUMN timezone VARCHAR(64) NOT NULL DEFAULT 'UTC'"
+            ))
+            db.commit()
+        except Exception:
+            db.rollback()  # column already exists — safe to ignore
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    Base.metadata.create_all(bind=engine)
+    _run_migrations()
+    _seed_admin()
+    yield
+
+
+app = FastAPI(title="Yolkbook API", lifespan=lifespan)

-# Allow requests from the Nginx frontend (same host, different port internally)
 app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
@@ -13,6 +83,8 @@ app.add_middleware(
    allow_headers=["*"],
 )

+app.include_router(auth_router.router)
+app.include_router(admin.router)
 app.include_router(eggs.router)
 app.include_router(flock.router)
 app.include_router(feed.router)
--- a/backend/models.py
+++ b/backend/models.py
@@ -1,13 +1,27 @@
 from datetime import date, datetime
-from sqlalchemy import Integer, Date, DateTime, Text, Numeric, func
+from sqlalchemy import Boolean, Integer, Date, DateTime, Text, Numeric, String, ForeignKey, UniqueConstraint, func
 from sqlalchemy.orm import Mapped, mapped_column
 from database import Base


-class EggCollection(Base):
-    __tablename__ = "egg_collections"
+class User(Base):
+    __tablename__ = "users"

    id:              Mapped[int]      = mapped_column(Integer, primary_key=True, autoincrement=True)
+    username:        Mapped[str]      = mapped_column(String(64), unique=True, nullable=False, index=True)
+    hashed_password: Mapped[str]      = mapped_column(String(255), nullable=False)
+    is_admin:        Mapped[bool]     = mapped_column(Boolean, default=False, nullable=False)
+    is_disabled:     Mapped[bool]     = mapped_column(Boolean, default=False, nullable=False)
+    timezone:        Mapped[str]      = mapped_column(String(64), nullable=False, default='UTC')
+    created_at:      Mapped[datetime] = mapped_column(DateTime, server_default=func.now())
+
+
+class EggCollection(Base):
+    __tablename__ = "egg_collections"
+    __table_args__ = (UniqueConstraint("user_id", "date", name="uq_user_date"),)
+
+    id:         Mapped[int]      = mapped_column(Integer, primary_key=True, autoincrement=True)
+    user_id:    Mapped[int]      = mapped_column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True)
    date:       Mapped[date]     = mapped_column(Date, nullable=False, index=True)
    eggs:       Mapped[int]      = mapped_column(Integer, nullable=False)
    notes:      Mapped[str]      = mapped_column(Text, nullable=True)
@@ -18,6 +32,7 @@ class FlockHistory(Base):
    __tablename__ = "flock_history"

    id:            Mapped[int]      = mapped_column(Integer, primary_key=True, autoincrement=True)
+    user_id:       Mapped[int]      = mapped_column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True)
    date:          Mapped[date]     = mapped_column(Date, nullable=False, index=True)
    chicken_count: Mapped[int]      = mapped_column(Integer, nullable=False)
    notes:         Mapped[str]      = mapped_column(Text, nullable=True)
@@ -28,6 +43,7 @@ class FeedPurchase(Base):
    __tablename__ = "feed_purchases"

    id:            Mapped[int]      = mapped_column(Integer, primary_key=True, autoincrement=True)
+    user_id:       Mapped[int]      = mapped_column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True)
    date:          Mapped[date]     = mapped_column(Date, nullable=False, index=True)
    bags:          Mapped[float]    = mapped_column(Numeric(5, 2), nullable=False)
    price_per_bag: Mapped[float]    = mapped_column(Numeric(10, 2), nullable=False)
@@ -39,6 +55,7 @@ class OtherPurchase(Base):
    __tablename__ = "other_purchases"

    id:         Mapped[int]      = mapped_column(Integer, primary_key=True, autoincrement=True)
+    user_id:    Mapped[int]      = mapped_column(Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True)
    date:       Mapped[date]     = mapped_column(Date, nullable=False, index=True)
    total:      Mapped[float]    = mapped_column(Numeric(10, 2), nullable=False)
    notes:      Mapped[str]      = mapped_column(Text, nullable=True)
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -4,3 +4,6 @@ sqlalchemy==2.0.36
 pymysql==1.1.1
 cryptography==43.0.3
 pydantic==2.9.2
+python-jose[cryptography]==3.3.0
+passlib[bcrypt]==1.7.4
+bcrypt==4.0.1
--- a/backend/routers/admin.py
+++ b/backend/routers/admin.py
@@ -0,0 +1,111 @@
+from fastapi import APIRouter, Depends, HTTPException
+from sqlalchemy import select
+from sqlalchemy.orm import Session
+
+from database import get_db
+from models import User
+from schemas import UserCreate, UserOut, ResetPasswordRequest, TokenResponse
+from auth import hash_password, create_access_token, get_current_admin, get_current_user
+
+router = APIRouter(prefix="/api/admin", tags=["admin"])
+
+
+@router.get("/users", response_model=list[UserOut])
+def list_users(
+    _: User = Depends(get_current_admin),
+    db: Session = Depends(get_db),
+):
+    return db.scalars(select(User).order_by(User.created_at)).all()
+
+
+@router.post("/users", response_model=UserOut, status_code=201)
+def create_user(
+    body: UserCreate,
+    _: User = Depends(get_current_admin),
+    db: Session = Depends(get_db),
+):
+    existing = db.scalars(select(User).where(User.username == body.username)).first()
+    if existing:
+        raise HTTPException(status_code=409, detail="Username already taken")
+    user = User(
+        username=body.username,
+        hashed_password=hash_password(body.password),
+        is_admin=False,
+    )
+    db.add(user)
+    db.commit()
+    db.refresh(user)
+    return user
+
+
+@router.post("/users/{user_id}/reset-password")
+def reset_password(
+    user_id: int,
+    body: ResetPasswordRequest,
+    current_admin: User = Depends(get_current_admin),
+    db: Session = Depends(get_db),
+):
+    user = db.get(User, user_id)
+    if not user:
+        raise HTTPException(status_code=404, detail="User not found")
+    user.hashed_password = hash_password(body.new_password)
+    db.commit()
+    return {"detail": f"Password reset for {user.username}"}
+
+
+@router.post("/users/{user_id}/disable")
+def disable_user(
+    user_id: int,
+    current_admin: User = Depends(get_current_admin),
+    db: Session = Depends(get_db),
+):
+    user = db.get(User, user_id)
+    if not user:
+        raise HTTPException(status_code=404, detail="User not found")
+    if user.id == current_admin.id:
+        raise HTTPException(status_code=400, detail="Cannot disable your own account")
+    user.is_disabled = True
+    db.commit()
+    return {"detail": f"User {user.username} disabled"}
+
+
+@router.post("/users/{user_id}/enable")
+def enable_user(
+    user_id: int,
+    _: User = Depends(get_current_admin),
+    db: Session = Depends(get_db),
+):
+    user = db.get(User, user_id)
+    if not user:
+        raise HTTPException(status_code=404, detail="User not found")
+    user.is_disabled = False
+    db.commit()
+    return {"detail": f"User {user.username} enabled"}
+
+
+@router.delete("/users/{user_id}", status_code=204)
+def delete_user(
+    user_id: int,
+    current_admin: User = Depends(get_current_admin),
+    db: Session = Depends(get_db),
+):
+    user = db.get(User, user_id)
+    if not user:
+        raise HTTPException(status_code=404, detail="User not found")
+    if user.id == current_admin.id:
+        raise HTTPException(status_code=400, detail="Cannot delete your own account")
+    db.delete(user)
+    db.commit()
+
+
+@router.post("/users/{user_id}/impersonate", response_model=TokenResponse)
+def impersonate_user(
+    user_id: int,
+    _: User = Depends(get_current_admin),
+    db: Session = Depends(get_db),
+):
+    user = db.get(User, user_id)
+    if not user:
+        raise HTTPException(status_code=404, detail="User not found")
+    token = create_access_token(user.id, user.username, user.is_admin, user.timezone)
+    return TokenResponse(access_token=token)
--- a/backend/routers/auth_router.py
+++ b/backend/routers/auth_router.py
@@ -0,0 +1,85 @@
+from zoneinfo import ZoneInfo, ZoneInfoNotFoundError
+
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy import select
+from sqlalchemy.orm import Session
+
+from database import get_db
+from models import User
+from schemas import LoginRequest, TokenResponse, UserOut, UserCreate, ChangePasswordRequest, TimezoneUpdate
+from auth import verify_password, hash_password, create_access_token, get_current_user
+
+router = APIRouter(prefix="/api/auth", tags=["auth"])
+
+
+def _make_token(user: User) -> str:
+    return create_access_token(user.id, user.username, user.is_admin, user.timezone)
+
+
+@router.post("/login", response_model=TokenResponse)
+def login(body: LoginRequest, db: Session = Depends(get_db)):
+    user = db.scalars(select(User).where(User.username == body.username)).first()
+    if not user or not verify_password(body.password, user.hashed_password):
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Invalid username or password",
+        )
+    if user.is_disabled:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="Account is disabled. Contact your administrator.",
+        )
+    return TokenResponse(access_token=_make_token(user))
+
+
+@router.post("/register", response_model=TokenResponse, status_code=201)
+def register(body: UserCreate, db: Session = Depends(get_db)):
+    existing = db.scalars(select(User).where(User.username == body.username)).first()
+    if existing:
+        raise HTTPException(status_code=409, detail="Username already taken")
+    # Default timezone to UTC; user can change it in settings
+    user = User(
+        username=body.username,
+        hashed_password=hash_password(body.password),
+        is_admin=False,
+        timezone="UTC",
+    )
+    db.add(user)
+    db.commit()
+    db.refresh(user)
+    return TokenResponse(access_token=_make_token(user))
+
+
+@router.get("/me", response_model=UserOut)
+def me(current_user: User = Depends(get_current_user)):
+    return current_user
+
+
+@router.post("/change-password")
+def change_password(
+    body: ChangePasswordRequest,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    if not verify_password(body.current_password, current_user.hashed_password):
+        raise HTTPException(status_code=400, detail="Current password is incorrect")
+    current_user.hashed_password = hash_password(body.new_password)
+    db.commit()
+    return {"detail": "Password updated"}
+
+
+@router.put("/timezone", response_model=TokenResponse)
+def update_timezone(
+    body: TimezoneUpdate,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    try:
+        ZoneInfo(body.timezone)  # validate it's a real IANA timezone
+    except ZoneInfoNotFoundError:
+        raise HTTPException(status_code=400, detail=f"Unknown timezone: {body.timezone}")
+    current_user.timezone = body.timezone
+    db.commit()
+    db.refresh(current_user)
+    # Return a fresh token with the updated timezone embedded
+    return TokenResponse(access_token=_make_token(current_user))
--- a/backend/routers/eggs.py
+++ b/backend/routers/eggs.py
@@ -6,8 +6,9 @@ from sqlalchemy.exc import IntegrityError
 from sqlalchemy.orm import Session

 from database import get_db
-from models import EggCollection
+from models import EggCollection, User
 from schemas import EggCollectionCreate, EggCollectionUpdate, EggCollectionOut
+from auth import get_current_user

 router = APIRouter(prefix="/api/eggs", tags=["eggs"])

@@ -17,8 +18,13 @@ def list_eggs(
    start: Optional[date] = None,
    end:   Optional[date] = None,
    db:    Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
 ):
-    q = select(EggCollection).order_by(EggCollection.date.desc())
+    q = (
+        select(EggCollection)
+        .where(EggCollection.user_id == current_user.id)
+        .order_by(EggCollection.date.desc())
+    )
    if start:
        q = q.where(EggCollection.date >= start)
    if end:
@@ -27,8 +33,12 @@ def list_eggs(


@router.post("", response_model=EggCollectionOut, status_code=201)
-def create_egg_collection(body: EggCollectionCreate, db: Session = Depends(get_db)):
-    record = EggCollection(**body.model_dump())
+def create_egg_collection(
+    body: EggCollectionCreate,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    record = EggCollection(**body.model_dump(), user_id=current_user.id)
    db.add(record)
    try:
        db.commit()
@@ -44,8 +54,12 @@ def update_egg_collection(
    record_id: int,
    body: EggCollectionUpdate,
    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
 ):
-    record = db.get(EggCollection, record_id)
+    record = db.scalars(
+        select(EggCollection)
+        .where(EggCollection.id == record_id, EggCollection.user_id == current_user.id)
+    ).first()
    if not record:
        raise HTTPException(status_code=404, detail="Record not found")
    for field, value in body.model_dump(exclude_none=True).items():
@@ -54,14 +68,21 @@ def update_egg_collection(
        db.commit()
    except IntegrityError:
        db.rollback()
-        raise HTTPException(status_code=409, detail=f"An entry for that date already exists.")
+        raise HTTPException(status_code=409, detail="An entry for that date already exists.")
    db.refresh(record)
    return record


@router.delete("/{record_id}", status_code=204)
-def delete_egg_collection(record_id: int, db: Session = Depends(get_db)):
-    record = db.get(EggCollection, record_id)
+def delete_egg_collection(
+    record_id: int,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    record = db.scalars(
+        select(EggCollection)
+        .where(EggCollection.id == record_id, EggCollection.user_id == current_user.id)
+    ).first()
    if not record:
        raise HTTPException(status_code=404, detail="Record not found")
    db.delete(record)
--- a/backend/routers/feed.py
+++ b/backend/routers/feed.py
@@ -5,8 +5,9 @@ from sqlalchemy import select
 from sqlalchemy.orm import Session

 from database import get_db
-from models import FeedPurchase
+from models import FeedPurchase, User
 from schemas import FeedPurchaseCreate, FeedPurchaseUpdate, FeedPurchaseOut
+from auth import get_current_user

 router = APIRouter(prefix="/api/feed", tags=["feed"])

@@ -16,8 +17,13 @@ def list_feed_purchases(
    start: Optional[date] = None,
    end:   Optional[date] = None,
    db:    Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
 ):
-    q = select(FeedPurchase).order_by(FeedPurchase.date.desc())
+    q = (
+        select(FeedPurchase)
+        .where(FeedPurchase.user_id == current_user.id)
+        .order_by(FeedPurchase.date.desc())
+    )
    if start:
        q = q.where(FeedPurchase.date >= start)
    if end:
@@ -26,8 +32,12 @@ def list_feed_purchases(


@router.post("", response_model=FeedPurchaseOut, status_code=201)
-def create_feed_purchase(body: FeedPurchaseCreate, db: Session = Depends(get_db)):
-    record = FeedPurchase(**body.model_dump())
+def create_feed_purchase(
+    body: FeedPurchaseCreate,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    record = FeedPurchase(**body.model_dump(), user_id=current_user.id)
    db.add(record)
    db.commit()
    db.refresh(record)
@@ -39,8 +49,12 @@ def update_feed_purchase(
    record_id: int,
    body: FeedPurchaseUpdate,
    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
 ):
-    record = db.get(FeedPurchase, record_id)
+    record = db.scalars(
+        select(FeedPurchase)
+        .where(FeedPurchase.id == record_id, FeedPurchase.user_id == current_user.id)
+    ).first()
    if not record:
        raise HTTPException(status_code=404, detail="Record not found")
    for field, value in body.model_dump(exclude_none=True).items():
@@ -51,8 +65,15 @@ def update_feed_purchase(


@router.delete("/{record_id}", status_code=204)
-def delete_feed_purchase(record_id: int, db: Session = Depends(get_db)):
-    record = db.get(FeedPurchase, record_id)
+def delete_feed_purchase(
+    record_id: int,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    record = db.scalars(
+        select(FeedPurchase)
+        .where(FeedPurchase.id == record_id, FeedPurchase.user_id == current_user.id)
+    ).first()
    if not record:
        raise HTTPException(status_code=404, detail="Record not found")
    db.delete(record)
--- a/backend/routers/flock.py
+++ b/backend/routers/flock.py
@@ -5,30 +5,49 @@ from sqlalchemy import select
 from sqlalchemy.orm import Session

 from database import get_db
-from models import FlockHistory
+from models import FlockHistory, User
 from schemas import FlockHistoryCreate, FlockHistoryUpdate, FlockHistoryOut
+from auth import get_current_user

 router = APIRouter(prefix="/api/flock", tags=["flock"])


@router.get("", response_model=list[FlockHistoryOut])
-def list_flock_history(db: Session = Depends(get_db)):
-    q = select(FlockHistory).order_by(FlockHistory.date.desc())
+def list_flock_history(
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    q = (
+        select(FlockHistory)
+        .where(FlockHistory.user_id == current_user.id)
+        .order_by(FlockHistory.date.desc())
+    )
    return db.scalars(q).all()


@router.get("/current", response_model=Optional[FlockHistoryOut])
-def get_current_flock(db: Session = Depends(get_db)):
-    """Returns the most recent flock entry — the current flock size."""
-    q = select(FlockHistory).order_by(FlockHistory.date.desc()).limit(1)
+def get_current_flock(
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    q = (
+        select(FlockHistory)
+        .where(FlockHistory.user_id == current_user.id)
+        .order_by(FlockHistory.date.desc())
+        .limit(1)
+    )
    return db.scalars(q).first()


@router.get("/at/{target_date}", response_model=Optional[FlockHistoryOut])
-def get_flock_at_date(target_date: date, db: Session = Depends(get_db)):
-    """Returns the flock size that was in effect on a given date."""
+def get_flock_at_date(
+    target_date: date,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
    q = (
        select(FlockHistory)
+        .where(FlockHistory.user_id == current_user.id)
        .where(FlockHistory.date <= target_date)
        .order_by(FlockHistory.date.desc())
        .limit(1)
@@ -37,8 +56,12 @@ def get_flock_at_date(target_date: date, db: Session = Depends(get_db)):


@router.post("", response_model=FlockHistoryOut, status_code=201)
-def create_flock_entry(body: FlockHistoryCreate, db: Session = Depends(get_db)):
-    record = FlockHistory(**body.model_dump())
+def create_flock_entry(
+    body: FlockHistoryCreate,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    record = FlockHistory(**body.model_dump(), user_id=current_user.id)
    db.add(record)
    db.commit()
    db.refresh(record)
@@ -50,8 +73,12 @@ def update_flock_entry(
    record_id: int,
    body: FlockHistoryUpdate,
    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
 ):
-    record = db.get(FlockHistory, record_id)
+    record = db.scalars(
+        select(FlockHistory)
+        .where(FlockHistory.id == record_id, FlockHistory.user_id == current_user.id)
+    ).first()
    if not record:
        raise HTTPException(status_code=404, detail="Record not found")
    for field, value in body.model_dump(exclude_none=True).items():
@@ -62,8 +89,15 @@ def update_flock_entry(


@router.delete("/{record_id}", status_code=204)
-def delete_flock_entry(record_id: int, db: Session = Depends(get_db)):
-    record = db.get(FlockHistory, record_id)
+def delete_flock_entry(
+    record_id: int,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    record = db.scalars(
+        select(FlockHistory)
+        .where(FlockHistory.id == record_id, FlockHistory.user_id == current_user.id)
+    ).first()
    if not record:
        raise HTTPException(status_code=404, detail="Record not found")
    db.delete(record)
--- a/backend/routers/other.py
+++ b/backend/routers/other.py
@@ -5,8 +5,9 @@ from sqlalchemy import select
 from sqlalchemy.orm import Session

 from database import get_db
-from models import OtherPurchase
+from models import OtherPurchase, User
 from schemas import OtherPurchaseCreate, OtherPurchaseUpdate, OtherPurchaseOut
+from auth import get_current_user

 router = APIRouter(prefix="/api/other", tags=["other"])

@@ -16,8 +17,13 @@ def list_other_purchases(
    start: Optional[date] = None,
    end:   Optional[date] = None,
    db:    Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
 ):
-    q = select(OtherPurchase).order_by(OtherPurchase.date.desc())
+    q = (
+        select(OtherPurchase)
+        .where(OtherPurchase.user_id == current_user.id)
+        .order_by(OtherPurchase.date.desc())
+    )
    if start:
        q = q.where(OtherPurchase.date >= start)
    if end:
@@ -26,8 +32,12 @@ def list_other_purchases(


@router.post("", response_model=OtherPurchaseOut, status_code=201)
-def create_other_purchase(body: OtherPurchaseCreate, db: Session = Depends(get_db)):
-    record = OtherPurchase(**body.model_dump())
+def create_other_purchase(
+    body: OtherPurchaseCreate,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    record = OtherPurchase(**body.model_dump(), user_id=current_user.id)
    db.add(record)
    db.commit()
    db.refresh(record)
@@ -39,8 +49,12 @@ def update_other_purchase(
    record_id: int,
    body: OtherPurchaseUpdate,
    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
 ):
-    record = db.get(OtherPurchase, record_id)
+    record = db.scalars(
+        select(OtherPurchase)
+        .where(OtherPurchase.id == record_id, OtherPurchase.user_id == current_user.id)
+    ).first()
    if not record:
        raise HTTPException(status_code=404, detail="Record not found")
    for field, value in body.model_dump(exclude_none=True).items():
@@ -51,8 +65,15 @@ def update_other_purchase(


@router.delete("/{record_id}", status_code=204)
-def delete_other_purchase(record_id: int, db: Session = Depends(get_db)):
-    record = db.get(OtherPurchase, record_id)
+def delete_other_purchase(
+    record_id: int,
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    record = db.scalars(
+        select(OtherPurchase)
+        .where(OtherPurchase.id == record_id, OtherPurchase.user_id == current_user.id)
+    ).first()
    if not record:
        raise HTTPException(status_code=404, detail="Record not found")
    db.delete(record)
--- a/backend/routers/stats.py
+++ b/backend/routers/stats.py
@@ -1,25 +1,30 @@
 import calendar
-from datetime import date, timedelta
+from datetime import date, datetime, timedelta
 from decimal import Decimal
+from zoneinfo import ZoneInfo, ZoneInfoNotFoundError
 from fastapi import APIRouter, Depends
 from sqlalchemy import select, func
 from sqlalchemy.orm import Session

 from database import get_db
-from models import EggCollection, FlockHistory, FeedPurchase, OtherPurchase
+from models import EggCollection, FlockHistory, FeedPurchase, OtherPurchase, User
 from schemas import DashboardStats, BudgetStats, MonthlySummary
+from auth import get_current_user

 router = APIRouter(prefix="/api/stats", tags=["stats"])


-def _avg_per_hen_30d(db: Session, start_30d: date) -> float | None:
-    """
-    For each collection in the last 30 days, look up the flock size that was
-    in effect on that date using a correlated subquery, then average eggs/hen
-    across those days. This gives an accurate result even when flock size changed.
-    """
+def _today(user_timezone: str) -> date:
+    try:
+        return datetime.now(ZoneInfo(user_timezone)).date()
+    except ZoneInfoNotFoundError:
+        return date.today()
+
+
+def _avg_per_hen_30d(db: Session, user_id: int, start_30d: date) -> float | None:
    flock_at_date = (
        select(FlockHistory.chicken_count)
+        .where(FlockHistory.user_id == user_id)
        .where(FlockHistory.date <= EggCollection.date)
        .order_by(FlockHistory.date.desc())
        .limit(1)
@@ -29,6 +34,7 @@ def _avg_per_hen_30d(db: Session, start_30d: date) -> float | None:

    rows = db.execute(
        select(EggCollection.eggs, flock_at_date.label('flock_count'))
+        .where(EggCollection.user_id == user_id)
        .where(EggCollection.date >= start_30d)
    ).all()

@@ -38,15 +44,18 @@ def _avg_per_hen_30d(db: Session, start_30d: date) -> float | None:
    return round(sum(e / f for e, f in valid) / len(valid), 3)


-def _current_flock(db: Session) -> int | None:
+def _current_flock(db: Session, user_id: int) -> int | None:
    row = db.scalars(
-        select(FlockHistory).order_by(FlockHistory.date.desc()).limit(1)
+        select(FlockHistory)
+        .where(FlockHistory.user_id == user_id)
+        .order_by(FlockHistory.date.desc())
+        .limit(1)
    ).first()
    return row.chicken_count if row else None


-def _total_eggs(db: Session, start: date | None = None, end: date | None = None) -> int:
-    q = select(func.coalesce(func.sum(EggCollection.eggs), 0))
+def _total_eggs(db: Session, user_id: int, start: date | None = None, end: date | None = None) -> int:
+    q = select(func.coalesce(func.sum(EggCollection.eggs), 0)).where(EggCollection.user_id == user_id)
    if start:
        q = q.where(EggCollection.date >= start)
    if end:
@@ -54,10 +63,10 @@ def _total_eggs(db: Session, start: date | None = None, end: date | None = None)
    return db.scalar(q)


-def _total_feed_cost(db: Session, start: date | None = None, end: date | None = None):
+def _total_feed_cost(db: Session, user_id: int, start: date | None = None, end: date | None = None):
    q = select(
        func.coalesce(func.sum(FeedPurchase.bags * FeedPurchase.price_per_bag), 0)
-    )
+    ).where(FeedPurchase.user_id == user_id)
    if start:
        q = q.where(FeedPurchase.date >= start)
    if end:
@@ -65,8 +74,8 @@ def _total_feed_cost(db: Session, start: date | None = None, end: date | None =
    return db.scalar(q)


-def _total_other_cost(db: Session, start: date | None = None, end: date | None = None):
-    q = select(func.coalesce(func.sum(OtherPurchase.total), 0))
+def _total_other_cost(db: Session, user_id: int, start: date | None = None, end: date | None = None):
+    q = select(func.coalesce(func.sum(OtherPurchase.total), 0)).where(OtherPurchase.user_id == user_id)
    if start:
        q = q.where(OtherPurchase.date >= start)
    if end:
@@ -75,29 +84,33 @@ def _total_other_cost(db: Session, start: date | None = None, end: date | None =


@router.get("/dashboard", response_model=DashboardStats)
-def dashboard_stats(db: Session = Depends(get_db)):
-    today      = date.today()
+def dashboard_stats(
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    uid = current_user.id
+    today     = _today(current_user.timezone)
    start_30d = today - timedelta(days=30)
    start_7d  = today - timedelta(days=7)

-    total_alltime = _total_eggs(db)
-    total_30d     = _total_eggs(db, start=start_30d)
-    total_7d      = _total_eggs(db, start=start_7d)
-    flock         = _current_flock(db)
+    total_alltime = _total_eggs(db, uid)
+    total_30d     = _total_eggs(db, uid, start=start_30d)
+    total_7d      = _total_eggs(db, uid, start=start_7d)
+    flock         = _current_flock(db, uid)

-    # Count how many distinct days have a collection logged
    days_tracked = db.scalar(
        select(func.count(func.distinct(EggCollection.date)))
+        .where(EggCollection.user_id == uid)
    )

-    # Average eggs per day over the last 30 days (only counting days with data)
    days_with_data_30d = db.scalar(
        select(func.count(func.distinct(EggCollection.date)))
+        .where(EggCollection.user_id == uid)
        .where(EggCollection.date >= start_30d)
    )

    avg_per_day = round(total_30d / days_with_data_30d, 2) if days_with_data_30d else None
-    avg_per_hen = _avg_per_hen_30d(db, start_30d)
+    avg_per_hen = _avg_per_hen_30d(db, uid, start_30d)

    return DashboardStats(
        current_flock=flock,
@@ -111,10 +124,13 @@ def dashboard_stats(db: Session = Depends(get_db)):


@router.get("/monthly", response_model=list[MonthlySummary])
-def monthly_stats(db: Session = Depends(get_db)):
+def monthly_stats(
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    uid = current_user.id
    MONTH_NAMES = ['Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec']

-    # Monthly egg totals
    egg_rows = db.execute(
        select(
            func.year(EggCollection.date).label('year'),
@@ -122,6 +138,7 @@ def monthly_stats(db: Session = Depends(get_db)):
            func.sum(EggCollection.eggs).label('total_eggs'),
            func.count(EggCollection.date).label('days_logged'),
        )
+        .where(EggCollection.user_id == uid)
        .group_by(func.year(EggCollection.date), func.month(EggCollection.date))
        .order_by(func.year(EggCollection.date).desc(), func.month(EggCollection.date).desc())
    ).all()
@@ -129,25 +146,25 @@ def monthly_stats(db: Session = Depends(get_db)):
    if not egg_rows:
        return []

-    # Monthly feed costs
    feed_rows = db.execute(
        select(
            func.year(FeedPurchase.date).label('year'),
            func.month(FeedPurchase.date).label('month'),
            func.sum(FeedPurchase.bags * FeedPurchase.price_per_bag).label('feed_cost'),
        )
+        .where(FeedPurchase.user_id == uid)
        .group_by(func.year(FeedPurchase.date), func.month(FeedPurchase.date))
    ).all()

    feed_map = {(r.year, r.month): r.feed_cost for r in feed_rows}

-    # Monthly other costs
    other_rows = db.execute(
        select(
            func.year(OtherPurchase.date).label('year'),
            func.month(OtherPurchase.date).label('month'),
            func.sum(OtherPurchase.total).label('other_cost'),
        )
+        .where(OtherPurchase.user_id == uid)
        .group_by(func.year(OtherPurchase.date), func.month(OtherPurchase.date))
    ).all()

@@ -159,9 +176,9 @@ def monthly_stats(db: Session = Depends(get_db)):
        last_day  = calendar.monthrange(y, m)[1]
        month_end = date(y, m, last_day)

-        # Flock size in effect at the end of this month
        flock_row = db.scalars(
            select(FlockHistory)
+            .where(FlockHistory.user_id == uid)
            .where(FlockHistory.date <= month_end)
            .order_by(FlockHistory.date.desc())
            .limit(1)
@@ -201,16 +218,20 @@ def monthly_stats(db: Session = Depends(get_db)):


@router.get("/budget", response_model=BudgetStats)
-def budget_stats(db: Session = Depends(get_db)):
-    today     = date.today()
+def budget_stats(
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+):
+    uid = current_user.id
+    today     = _today(current_user.timezone)
    start_30d = today - timedelta(days=30)

-    total_feed_cost      = _total_feed_cost(db)
-    total_feed_cost_30d  = _total_feed_cost(db, start=start_30d)
-    total_other_cost     = _total_other_cost(db)
-    total_other_cost_30d = _total_other_cost(db, start=start_30d)
-    total_eggs           = _total_eggs(db)
-    total_eggs_30d       = _total_eggs(db, start=start_30d)
+    total_feed_cost      = _total_feed_cost(db, uid)
+    total_feed_cost_30d  = _total_feed_cost(db, uid, start=start_30d)
+    total_other_cost     = _total_other_cost(db, uid)
+    total_other_cost_30d = _total_other_cost(db, uid, start=start_30d)
+    total_eggs           = _total_eggs(db, uid)
+    total_eggs_30d       = _total_eggs(db, uid, start=start_30d)

    def cost_per_egg(cost, eggs):
        if not eggs or not cost:
--- a/backend/schemas.py
+++ b/backend/schemas.py
@@ -4,6 +4,44 @@ from typing import Optional
 from pydantic import BaseModel, Field


+# ── Auth ──────────────────────────────────────────────────────────────────────
+
+class LoginRequest(BaseModel):
+    username: str
+    password: str
+
+class TokenResponse(BaseModel):
+    access_token: str
+    token_type: str = "bearer"
+
+class ChangePasswordRequest(BaseModel):
+    current_password: str
+    new_password: str = Field(min_length=6)
+
+class ResetPasswordRequest(BaseModel):
+    new_password: str = Field(min_length=6)
+
+class TimezoneUpdate(BaseModel):
+    timezone: str = Field(min_length=1, max_length=64)
+
+
+# ── Users ─────────────────────────────────────────────────────────────────────
+
+class UserCreate(BaseModel):
+    username: str = Field(min_length=2, max_length=64)
+    password: str = Field(min_length=6)
+
+class UserOut(BaseModel):
+    id:          int
+    username:    str
+    is_admin:    bool
+    is_disabled: bool
+    timezone:    str
+    created_at:  datetime
+
+    model_config = {"from_attributes": True}
+
+
 # ── Egg Collections ───────────────────────────────────────────────────────────

 class EggCollectionCreate(BaseModel):
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -29,6 +29,9 @@ services:
    env_file: .env
    environment:
      DATABASE_URL:     mysql+pymysql://${MYSQL_USER}:${MYSQL_PASSWORD}@db/${MYSQL_DATABASE}
+      ADMIN_USERNAME:   ${ADMIN_USERNAME}
+      ADMIN_PASSWORD:   ${ADMIN_PASSWORD}
+      JWT_SECRET:       ${JWT_SECRET}
    depends_on:
      db:
        condition: service_healthy   # wait for MySQL to be ready before starting
--- a/mysql/init.sql
+++ b/mysql/init.sql
@@ -1,4 +1,4 @@
-- Eggtracker schema
+-- Eggtracker schema — multi-user edition
 -- This file runs automatically on first container startup only.
 -- To re-run it, remove the mysql_data volume: docker compose down -v

@@ -8,50 +8,72 @@ CREATE DATABASE IF NOT EXISTS eggtracker

 USE eggtracker;

+-- ── Users ─────────────────────────────────────────────────────────────────────
+CREATE TABLE IF NOT EXISTS users (
+    id              INT UNSIGNED    NOT NULL AUTO_INCREMENT,
+    username        VARCHAR(64)     NOT NULL,
+    hashed_password VARCHAR(255)    NOT NULL,
+    is_admin        TINYINT(1)      NOT NULL DEFAULT 0,
+    is_disabled     TINYINT(1)      NOT NULL DEFAULT 0,
+    created_at      DATETIME        NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    PRIMARY KEY (id),
+    UNIQUE KEY uq_username (username)
+) ENGINE=InnoDB;
+
 -- ── Egg collections ───────────────────────────────────────────────────────────
 CREATE TABLE IF NOT EXISTS egg_collections (
    id          INT UNSIGNED    NOT NULL AUTO_INCREMENT,
+    user_id     INT UNSIGNED    NOT NULL,
    date        DATE            NOT NULL,
    eggs        INT UNSIGNED    NOT NULL,
    notes       TEXT,
    created_at  DATETIME        NOT NULL DEFAULT CURRENT_TIMESTAMP,
    PRIMARY KEY (id),
-    UNIQUE KEY uq_date (date)
+    UNIQUE KEY uq_user_date (user_id, date),
+    INDEX idx_user_id (user_id),
+    INDEX idx_date (date),
+    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
 ) ENGINE=InnoDB;

 -- ── Flock history ─────────────────────────────────────────────────────────────
-- Each row records a change in flock size. The count in effect for any given
-- date is the most recent row with date <= that date.
 CREATE TABLE IF NOT EXISTS flock_history (
    id             INT UNSIGNED    NOT NULL AUTO_INCREMENT,
+    user_id        INT UNSIGNED    NOT NULL,
    date           DATE            NOT NULL,
    chicken_count  INT UNSIGNED    NOT NULL,
    notes          TEXT,
    created_at     DATETIME        NOT NULL DEFAULT CURRENT_TIMESTAMP,
    PRIMARY KEY (id),
-    INDEX idx_date (date)
+    INDEX idx_user_id (user_id),
+    INDEX idx_date (date),
+    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
 ) ENGINE=InnoDB;

 -- ── Feed purchases ────────────────────────────────────────────────────────────
 CREATE TABLE IF NOT EXISTS feed_purchases (
    id             INT UNSIGNED      NOT NULL AUTO_INCREMENT,
+    user_id        INT UNSIGNED      NOT NULL,
    date           DATE              NOT NULL,
-    bags           DECIMAL(5, 2)     NOT NULL,   -- decimal for partial bags
+    bags           DECIMAL(5, 2)     NOT NULL,
    price_per_bag  DECIMAL(10, 2)    NOT NULL,
    notes          TEXT,
    created_at     DATETIME          NOT NULL DEFAULT CURRENT_TIMESTAMP,
    PRIMARY KEY (id),
-    INDEX idx_date (date)
+    INDEX idx_user_id (user_id),
+    INDEX idx_date (date),
+    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
 ) ENGINE=InnoDB;

 -- ── Other purchases ───────────────────────────────────────────────────────────
-- Catch-all for non-feed costs: bedding, snacks, shelter, etc.
 CREATE TABLE IF NOT EXISTS other_purchases (
    id         INT UNSIGNED   NOT NULL AUTO_INCREMENT,
+    user_id    INT UNSIGNED   NOT NULL,
    date       DATE           NOT NULL,
    total      DECIMAL(10, 2) NOT NULL,
    notes      TEXT,
    created_at DATETIME       NOT NULL DEFAULT CURRENT_TIMESTAMP,
    PRIMARY KEY (id),
-    INDEX idx_date (date)
+    INDEX idx_user_id (user_id),
+    INDEX idx_date (date),
+    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
 ) ENGINE=InnoDB;
--- a/mysql/migrate_v2.sql
+++ b/mysql/migrate_v2.sql
@@ -0,0 +1,50 @@
+-- Eggtracker v2 migration — adds multi-user support to an existing database.
+-- Run this ONCE on an existing install BEFORE restarting with the new image:
+--
+--   docker compose exec db mysql -u root -p"${MYSQL_ROOT_PASSWORD}" eggtracker < mysql/migrate_v2.sql
+--
+-- After running this script, restart the stack (docker compose up -d --build).
+-- The API will automatically create the admin user (from ADMIN_USERNAME /
+-- ADMIN_PASSWORD in .env) and assign all existing records to that admin account.
+--
+-- NOTE: Run this script only ONCE. Running it again will fail on the ADD COLUMN
+-- statements since the columns will already exist.
+
+USE eggtracker;
+
+-- ── Create users table ────────────────────────────────────────────────────────
+CREATE TABLE IF NOT EXISTS users (
+    id              INT UNSIGNED    NOT NULL AUTO_INCREMENT,
+    username        VARCHAR(64)     NOT NULL,
+    hashed_password VARCHAR(255)    NOT NULL,
+    is_admin        TINYINT(1)      NOT NULL DEFAULT 0,
+    is_disabled     TINYINT(1)      NOT NULL DEFAULT 0,
+    created_at      DATETIME        NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    PRIMARY KEY (id),
+    UNIQUE KEY uq_username (username)
+) ENGINE=InnoDB;
+
+-- ── Add user_id columns (nullable so existing rows remain valid) ───────────────
+ALTER TABLE egg_collections
+    ADD COLUMN user_id INT UNSIGNED NULL AFTER id,
+    ADD INDEX idx_user_id (user_id);
+
+ALTER TABLE flock_history
+    ADD COLUMN user_id INT UNSIGNED NULL AFTER id,
+    ADD INDEX idx_user_id (user_id);
+
+ALTER TABLE feed_purchases
+    ADD COLUMN user_id INT UNSIGNED NULL AFTER id,
+    ADD INDEX idx_user_id (user_id);
+
+ALTER TABLE other_purchases
+    ADD COLUMN user_id INT UNSIGNED NULL AFTER id,
+    ADD INDEX idx_user_id (user_id);
+
+-- ── Remove old single-column unique index on egg_collections.date ─────────────
+-- It will be replaced by (user_id, date) once the admin is seeded.
+ALTER TABLE egg_collections DROP INDEX uq_date;
+
+-- The API startup will:
+-- 1. Create the admin user from ADMIN_USERNAME / ADMIN_PASSWORD in .env
+-- 2. Set user_id = admin.id on all rows where user_id IS NULL
--- a/nginx/html/404.html
+++ b/nginx/html/404.html
@@ -3,7 +3,7 @@
 <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
-    <title>404 Not Found — Eggtracker</title>
+    <title>404 Not Found — Yolkbook</title>
    <link rel="stylesheet" href="/css/style.css">
    <style>
        .error-center { text-align: center; padding: 5rem 1rem; }
@@ -13,7 +13,7 @@
 </head>
 <body>
    <nav class="nav">
-        <a class="nav-brand" href="/">🥚 Eggtracker</a>
+        <a class="nav-brand" href="/">🥚 Yolkbook</a>
        <ul class="nav-links">
            <li><a href="/">Dashboard</a></li>
            <li><a href="/log">Log Eggs</a></li>
--- a/nginx/html/50x.html
+++ b/nginx/html/50x.html
@@ -3,7 +3,7 @@
 <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
-    <title>Server Error — Eggtracker</title>
+    <title>Server Error — Yolkbook</title>
    <link rel="stylesheet" href="/css/style.css">
    <style>
        .error-center { text-align: center; padding: 5rem 1rem; }
@@ -13,7 +13,7 @@
 </head>
 <body>
    <nav class="nav">
-        <a class="nav-brand" href="/">🥚 Eggtracker</a>
+        <a class="nav-brand" href="/">🥚 Yolkbook</a>
    </nav>
    <main class="container">
        <div class="error-center">
--- a/nginx/html/admin.html
+++ b/nginx/html/admin.html
@@ -0,0 +1,85 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Admin — Yolkbook</title>
+    <link rel="icon" href="/favicon.svg" type="image/svg+xml">
+    <link rel="stylesheet" href="/css/style.css">
+</head>
+<body>
+    <nav class="nav">
+        <a class="nav-brand" href="/">🥚 <span>Yolkbook</span></a>
+        <ul class="nav-links">
+            <li><a href="/">Dashboard</a></li>
+            <li><a href="/log">Log Eggs</a></li>
+            <li><a href="/history">History</a></li>
+            <li><a href="/flock">Flock</a></li>
+            <li><a href="/budget">Budget</a></li>
+            <li><a href="/summary">Summary</a></li>
+        </ul>
+    </nav>
+
+    <main class="container">
+        <h1>Admin — User Management</h1>
+
+        <div id="msg" class="message"></div>
+
+        <!-- User list -->
+        <div class="section-header">
+            <h2>All Users</h2>
+            <button class="btn btn-ghost btn-sm" onclick="loadUsers()">Refresh</button>
+        </div>
+
+        <div class="table-wrap">
+            <table>
+                <thead>
+                    <tr>
+                        <th>Username</th>
+                        <th>Role</th>
+                        <th>Status</th>
+                        <th>Created</th>
+                        <th>Actions</th>
+                    </tr>
+                </thead>
+                <tbody id="users-body">
+                    <tr class="empty-row"><td colspan="5">Loading…</td></tr>
+                </tbody>
+            </table>
+        </div>
+
+        <!-- Reset password modal -->
+        <div id="reset-modal" class="modal-overlay" style="display:none">
+            <div class="modal-box">
+                <h2>Reset Password</h2>
+                <p style="margin-bottom:1rem;color:var(--muted)">Setting new password for: <strong id="reset-username"></strong></p>
+                <div id="reset-msg" class="message"></div>
+                <div class="form-group" style="margin-bottom:1rem">
+                    <label>New Password</label>
+                    <input type="password" id="reset-password" minlength="6" placeholder="min 6 characters">
+                </div>
+                <div style="display:flex;gap:0.5rem;justify-content:flex-end">
+                    <button class="btn btn-ghost" onclick="hideResetModal()">Cancel</button>
+                    <button class="btn btn-primary" onclick="submitReset()">Set Password</button>
+                </div>
+            </div>
+        </div>
+
+        <!-- Delete confirmation modal -->
+        <div id="delete-modal" class="modal-overlay" style="display:none">
+            <div class="modal-box">
+                <h2>Delete User</h2>
+                <p style="margin-bottom:1.5rem">Delete <strong id="delete-username"></strong>? This will permanently remove their account and all associated data.</p>
+                <div style="display:flex;gap:0.5rem;justify-content:flex-end">
+                    <button class="btn btn-ghost" onclick="hideDeleteModal()">Cancel</button>
+                    <button class="btn btn-danger" onclick="submitDelete()">Delete</button>
+                </div>
+            </div>
+        </div>
+    </main>
+
+    <script src="/js/api.js?v=3"></script>
+    <script src="/js/auth.js?v=3"></script>
+    <script src="/js/admin.js?v=3"></script>
+</body>
+</html>
--- a/nginx/html/budget.html
+++ b/nginx/html/budget.html
@@ -3,13 +3,13 @@
 <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
-    <title>Budget — Eggtracker</title>
+    <title>Budget — Yolkbook</title>
    <link rel="icon" href="/favicon.svg" type="image/svg+xml">
    <link rel="stylesheet" href="/css/style.css">
 </head>
 <body>
    <nav class="nav">
-        <a class="nav-brand" href="/">🥚 <span>Eggtracker</span></a>
+        <a class="nav-brand" href="/">🥚 <span>Yolkbook</span></a>
        <ul class="nav-links">
            <li><a href="/">Dashboard</a></li>
            <li><a href="/log">Log Eggs</a></li>
@@ -123,7 +123,8 @@
        </div>
    </main>

-    <script src="/js/api.js?v=2"></script>
+    <script src="/js/api.js?v=3"></script>
+    <script src="/js/auth.js?v=3"></script>
    <script src="/js/budget.js?v=3"></script>
 </body>
 </html>
--- a/nginx/html/css/style.css
+++ b/nginx/html/css/style.css
@@ -173,6 +173,7 @@ label { font-size: 0.875rem; font-weight: 500; }
 input[type="text"],
 input[type="number"],
 input[type="date"],
+input[type="password"],
 textarea,
 select {
    padding: 0.5rem 0.75rem;
@@ -259,4 +260,120 @@ td input[type="date"] {
    .nav-links { overflow-x: auto; scrollbar-width: none; }
    .nav-links::-webkit-scrollbar { display: none; }
    .nav-links a { padding: 0.4rem 0.55rem; font-size: 0.82rem; white-space: nowrap; }
+    .nav-username { display: none; }
+}
+
+/* ── Nav user section ─────────────────────────────────────────────────────── */
+.nav-user {
+    margin-left: auto;
+    display: flex;
+    align-items: center;
+    gap: 0.5rem;
+    flex-shrink: 0;
+}
+
+.nav-username {
+    color: rgba(255,255,255,0.85);
+    font-size: 0.88rem;
+    white-space: nowrap;
+}
+
+.nav-impersonating {
+    color: #ffe08a;
+    font-size: 0.85rem;
+    white-space: nowrap;
+}
+
+.nav-admin-btn {
+    color: rgba(255,255,255,0.85) !important;
+    border-color: rgba(255,255,255,0.35) !important;
+}
+.nav-admin-btn:hover {
+    background: rgba(255,255,255,0.15) !important;
+    color: #fff !important;
+}
+
+.btn-amber { background: var(--amber); color: #fff; }
+.btn-amber:hover { background: #b8720a; }
+
+/* ── Login page ───────────────────────────────────────────────────────────── */
+.login-body {
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    min-height: 100vh;
+    background: var(--bg);
+}
+
+.login-container {
+    width: 100%;
+    max-width: 380px;
+    padding: 0 1rem;
+}
+
+.login-brand {
+    text-align: center;
+    font-size: 1.6rem;
+    font-weight: 700;
+    color: var(--green);
+    margin-bottom: 1.5rem;
+}
+
+.login-card { padding: 2rem; }
+
+.login-title {
+    text-align: center;
+    font-size: 1.3rem;
+    margin-bottom: 1.25rem;
+}
+
+/* ── Modals ───────────────────────────────────────────────────────────────── */
+.modal-overlay {
+    position: fixed;
+    inset: 0;
+    background: rgba(0,0,0,0.45);
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    z-index: 500;
+    padding: 1rem;
+}
+
+.modal-box {
+    background: var(--card-bg);
+    border-radius: var(--radius);
+    padding: 1.75rem;
+    width: 100%;
+    max-width: 420px;
+    box-shadow: 0 8px 32px rgba(0,0,0,0.18);
+}
+
+.modal-box h2 { margin-bottom: 1rem; }
+
+/* ── Badges ───────────────────────────────────────────────────────────────── */
+.badge {
+    display: inline-block;
+    padding: 0.2rem 0.55rem;
+    border-radius: 99px;
+    font-size: 0.75rem;
+    font-weight: 600;
+}
+
+.badge-admin    { background: #d4edff; color: #0055aa; }
+.badge-user     { background: #e8f5e9; color: #2e6b3e; }
+.badge-active   { background: #d4edda; color: #155724; }
+.badge-disabled { background: #f8d7da; color: #721c24; }
+
+/* ── Settings modal extras ────────────────────────────────────────────────── */
+.settings-section-title {
+    font-size: 0.95rem;
+    font-weight: 600;
+    color: var(--green-dark);
+    margin-bottom: 0.75rem;
+}
+
+.settings-divider {
+    border: none;
+    border-top: 1px solid var(--border);
+    margin: 1.25rem 0;
 }
--- a/nginx/html/flock.html
+++ b/nginx/html/flock.html
@@ -3,13 +3,13 @@
 <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
-    <title>Flock — Eggtracker</title>
+    <title>Flock — Yolkbook</title>
    <link rel="icon" href="/favicon.svg" type="image/svg+xml">
    <link rel="stylesheet" href="/css/style.css">
 </head>
 <body>
    <nav class="nav">
-        <a class="nav-brand" href="/">🥚 <span>Eggtracker</span></a>
+        <a class="nav-brand" href="/">🥚 <span>Yolkbook</span></a>
        <ul class="nav-links">
            <li><a href="/">Dashboard</a></li>
            <li><a href="/log">Log Eggs</a></li>
@@ -80,7 +80,8 @@
        </div>
    </main>

-    <script src="/js/api.js"></script>
+    <script src="/js/api.js?v=3"></script>
+    <script src="/js/auth.js?v=3"></script>
    <script src="/js/flock.js"></script>
 </body>
 </html>
--- a/nginx/html/history.html
+++ b/nginx/html/history.html
@@ -3,13 +3,13 @@
 <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
-    <title>History — Eggtracker</title>
+    <title>History — Yolkbook</title>
    <link rel="icon" href="/favicon.svg" type="image/svg+xml">
    <link rel="stylesheet" href="/css/style.css">
 </head>
 <body>
    <nav class="nav">
-        <a class="nav-brand" href="/">🥚 <span>Eggtracker</span></a>
+        <a class="nav-brand" href="/">🥚 <span>Yolkbook</span></a>
        <ul class="nav-links">
            <li><a href="/">Dashboard</a></li>
            <li><a href="/log">Log Eggs</a></li>
@@ -63,7 +63,8 @@
        </div>
    </main>

-    <script src="/js/api.js"></script>
+    <script src="/js/api.js?v=3"></script>
+    <script src="/js/auth.js?v=3"></script>
    <script src="/js/history.js"></script>
 </body>
 </html>
--- a/nginx/html/index.html
+++ b/nginx/html/index.html
@@ -3,13 +3,13 @@
 <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
-    <title>Dashboard — Eggtracker</title>
+    <title>Dashboard — Yolkbook</title>
    <link rel="icon" href="/favicon.svg" type="image/svg+xml">
    <link rel="stylesheet" href="/css/style.css">
 </head>
 <body>
    <nav class="nav">
-        <a class="nav-brand" href="/">🥚 <span>Eggtracker</span></a>
+        <a class="nav-brand" href="/">🥚 <span>Yolkbook</span></a>
        <ul class="nav-links">
            <li><a href="/">Dashboard</a></li>
            <li><a href="/log">Log Eggs</a></li>
@@ -73,7 +73,8 @@
    </main>

    <script src="https://cdn.jsdelivr.net/npm/chart.js@4.4.0/dist/chart.umd.min.js"></script>
-    <script src="/js/api.js?v=2"></script>
+    <script src="/js/api.js?v=3"></script>
+    <script src="/js/auth.js?v=3"></script>
    <script src="/js/dashboard.js?v=2"></script>
 </body>
 </html>
--- a/nginx/html/js/admin.js
+++ b/nginx/html/js/admin.js
@@ -0,0 +1,157 @@
+// admin.js — admin user management page
+
+let resetTargetId = null;
+let deleteTargetId = null;
+let currentAdminId = null;
+
+document.addEventListener('DOMContentLoaded', async () => {
+    // Verify admin access
+    const user = Auth.getUser();
+    if (!user || !user.is_admin) {
+        window.location.href = '/';
+        return;
+    }
+    currentAdminId = parseInt(user.sub);
+    await loadUsers();
+});
+
+async function loadUsers() {
+    try {
+        const users = await API.get('/api/admin/users');
+        renderUsers(users);
+    } catch (err) {
+        showMessage(document.getElementById('msg'), err.message, 'error');
+    }
+}
+
+function renderUsers(users) {
+    const tbody = document.getElementById('users-body');
+
+    if (!users.length) {
+        tbody.innerHTML = '<tr class="empty-row"><td colspan="5">No users found.</td></tr>';
+        return;
+    }
+
+    tbody.innerHTML = users.map(u => {
+        const isSelf = u.id === currentAdminId;
+        const roleLabel = u.is_admin
+            ? '<span class="badge badge-admin">Admin</span>'
+            : '<span class="badge badge-user">User</span>';
+        const statusLabel = u.is_disabled
+            ? '<span class="badge badge-disabled">Disabled</span>'
+            : '<span class="badge badge-active">Active</span>';
+        const created = new Date(u.created_at).toLocaleDateString();
+
+        const toggleBtn = u.is_disabled
+            ? `<button class="btn btn-sm btn-primary" onclick="toggleUser(${u.id}, false)">Enable</button>`
+            : `<button class="btn btn-sm btn-ghost" onclick="toggleUser(${u.id}, true)" ${isSelf ? 'disabled title="Cannot disable yourself"' : ''}>Disable</button>`;
+
+        const impersonateBtn = !isSelf
+            ? `<button class="btn btn-sm btn-ghost" onclick="impersonateUser(${u.id}, '${u.username}')">Login As</button>`
+            : '';
+
+        const deleteBtn = !isSelf
+            ? `<button class="btn btn-sm btn-danger" onclick="showDeleteModal(${u.id}, '${u.username}')">Delete</button>`
+            : '';
+
+        return `<tr>
+            <td><strong>${u.username}</strong></td>
+            <td>${roleLabel}</td>
+            <td>${statusLabel}</td>
+            <td>${created}</td>
+            <td class="actions" style="display:flex;gap:0.35rem;flex-wrap:wrap">
+                <button class="btn btn-sm btn-ghost" onclick="showResetModal(${u.id}, '${u.username}')">Reset PW</button>
+                ${toggleBtn}
+                ${impersonateBtn}
+                ${deleteBtn}
+            </td>
+        </tr>`;
+    }).join('');
+}
+
+
+function showResetModal(id, username) {
+    resetTargetId = id;
+    document.getElementById('reset-username').textContent = username;
+    document.getElementById('reset-password').value = '';
+    document.getElementById('reset-msg').className = 'message';
+    document.getElementById('reset-modal').style.display = 'flex';
+    document.getElementById('reset-password').focus();
+}
+
+function hideResetModal() {
+    document.getElementById('reset-modal').style.display = 'none';
+    resetTargetId = null;
+}
+
+async function submitReset() {
+    const password = document.getElementById('reset-password').value;
+    const msgEl = document.getElementById('reset-msg');
+
+    if (password.length < 6) {
+        msgEl.textContent = 'Password must be at least 6 characters';
+        msgEl.className = 'message error visible';
+        return;
+    }
+
+    try {
+        await API.post(`/api/admin/users/${resetTargetId}/reset-password`, { new_password: password });
+        msgEl.textContent = 'Password reset successfully.';
+        msgEl.className = 'message success visible';
+        setTimeout(hideResetModal, 1200);
+    } catch (err) {
+        msgEl.textContent = err.message;
+        msgEl.className = 'message error visible';
+    }
+}
+
+async function toggleUser(id, disable) {
+    const action = disable ? 'disable' : 'enable';
+    try {
+        await API.post(`/api/admin/users/${id}/${action}`, {});
+        await loadUsers();
+    } catch (err) {
+        showMessage(document.getElementById('msg'), err.message, 'error');
+    }
+}
+
+async function impersonateUser(id, username) {
+    try {
+        const data = await API.post(`/api/admin/users/${id}/impersonate`, {});
+        // Save admin token so user can return
+        sessionStorage.setItem('admin_token', Auth.getToken());
+        Auth.setToken(data.access_token);
+        window.location.href = '/';
+    } catch (err) {
+        showMessage(document.getElementById('msg'), err.message, 'error');
+    }
+}
+
+function showDeleteModal(id, username) {
+    deleteTargetId = id;
+    document.getElementById('delete-username').textContent = username;
+    document.getElementById('delete-modal').style.display = 'flex';
+}
+
+function hideDeleteModal() {
+    document.getElementById('delete-modal').style.display = 'none';
+    deleteTargetId = null;
+}
+
+async function submitDelete() {
+    try {
+        await API.del(`/api/admin/users/${deleteTargetId}`);
+        hideDeleteModal();
+        showMessage(document.getElementById('msg'), 'User deleted.');
+        await loadUsers();
+    } catch (err) {
+        hideDeleteModal();
+        showMessage(document.getElementById('msg'), err.message, 'error');
+    }
+}
+
+// Close modals on overlay click
+document.addEventListener('click', (e) => {
+    if (e.target.id === 'reset-modal') hideResetModal();
+    if (e.target.id === 'delete-modal') hideDeleteModal();
+});
--- a/nginx/html/js/api.js
+++ b/nginx/html/js/api.js
@@ -2,10 +2,21 @@

 const API = {
    async _fetch(url, options = {}) {
+        const token = localStorage.getItem('token');
+        const headers = { 'Content-Type': 'application/json' };
+        if (token) headers['Authorization'] = `Bearer ${token}`;
+
        const res = await fetch(url, {
-            headers: { 'Content-Type': 'application/json' },
+            headers,
            ...options,
        });
+
+        if (res.status === 401) {
+            localStorage.removeItem('token');
+            window.location.href = '/login';
+            return;
+        }
+
        if (!res.ok) {
            const err = await res.json().catch(() => ({ detail: res.statusText }));
            throw new Error(err.detail || `Request failed (${res.status})`);
@@ -27,13 +38,13 @@ function showMessage(el, text, type = 'success') {
    setTimeout(() => { el.className = 'message'; }, 4000);
 }

-// Set an input[type=date] to today's date (using local time, not UTC)
+// Set an input[type=date] to today's date in the user's configured timezone
 function setToday(inputEl) {
-    const now = new Date();
-    const y = now.getFullYear();
-    const m = String(now.getMonth() + 1).padStart(2, '0');
-    const d = String(now.getDate()).padStart(2, '0');
-    inputEl.value = `${y}-${m}-${d}`;
+    const tz = (typeof Auth !== 'undefined' && Auth.getUser()?.timezone)
+        || Intl.DateTimeFormat().resolvedOptions().timeZone
+        || 'UTC';
+    // en-CA locale produces YYYY-MM-DD which is what date inputs expect
+    inputEl.value = new Date().toLocaleDateString('en-CA', { timeZone: tz });
 }

 // Format YYYY-MM-DD → MM/DD/YYYY for display
--- a/nginx/html/js/auth.js
+++ b/nginx/html/js/auth.js
@@ -0,0 +1,232 @@
+// auth.js — authentication utilities used by every authenticated page
+
+const Auth = {
+    getToken() {
+        return localStorage.getItem('token');
+    },
+
+    setToken(token) {
+        localStorage.setItem('token', token);
+    },
+
+    removeToken() {
+        localStorage.removeItem('token');
+    },
+
+    getUser() {
+        const token = this.getToken();
+        if (!token) return null;
+        try {
+            const payload = JSON.parse(atob(token.split('.')[1]));
+            if (payload.exp < Date.now() / 1000) {
+                this.removeToken();
+                return null;
+            }
+            return payload;
+        } catch (_) {
+            return null;
+        }
+    },
+
+    requireAuth() {
+        const user = this.getUser();
+        if (!user) {
+            window.location.href = '/login';
+            return null;
+        }
+        return user;
+    },
+
+    logout() {
+        this.removeToken();
+        sessionStorage.removeItem('admin_token');
+        window.location.href = '/login';
+    },
+};
+
+function returnToAdmin() {
+    const adminToken = sessionStorage.getItem('admin_token');
+    Auth.setToken(adminToken);
+    sessionStorage.removeItem('admin_token');
+    window.location.href = '/admin';
+}
+
+// ── Timezone helpers ──────────────────────────────────────────────────────────
+
+function getUserTimezone() {
+    return Auth.getUser()?.timezone || Intl.DateTimeFormat().resolvedOptions().timeZone || 'UTC';
+}
+
+function buildTimezoneOptions(selected) {
+    let allTz;
+    try {
+        allTz = Intl.supportedValuesOf('timeZone');
+    } catch (_) {
+        // Fallback for older browsers
+        allTz = ['UTC', 'America/New_York', 'America/Chicago', 'America/Denver',
+                 'America/Los_Angeles', 'America/Anchorage', 'Pacific/Honolulu',
+                 'Europe/London', 'Europe/Paris', 'Europe/Berlin', 'Asia/Tokyo',
+                 'Asia/Shanghai', 'Australia/Sydney'];
+    }
+
+    const groups = {};
+    for (const tz of allTz) {
+        const slash = tz.indexOf('/');
+        const group = slash === -1 ? 'Other' : tz.slice(0, slash);
+        (groups[group] = groups[group] || []).push(tz);
+    }
+
+    return Object.keys(groups).sort().map(group => {
+        const options = groups[group].map(tz => {
+            const label = tz.slice(tz.indexOf('/') + 1).replace(/_/g, ' ').replace(/\//g, ' / ');
+            return `<option value="${tz}"${tz === selected ? ' selected' : ''}>${label}</option>`;
+        }).join('');
+        return `<optgroup label="${group}">${options}</optgroup>`;
+    }).join('');
+}
+
+// ── Nav + settings modal ──────────────────────────────────────────────────────
+
+function initNav() {
+    const user = Auth.requireAuth();
+    if (!user) return;
+
+    const nav = document.querySelector('.nav');
+    if (!nav) return;
+
+    const adminToken = sessionStorage.getItem('admin_token');
+    const navUser = document.createElement('div');
+    navUser.className = 'nav-user';
+
+    if (adminToken) {
+        navUser.innerHTML = `
+            <span class="nav-impersonating">Viewing as <strong>${user.username}</strong></span>
+            <button onclick="returnToAdmin()" class="btn btn-sm btn-amber">&#8617; Return to Admin</button>
+        `;
+    } else {
+        navUser.innerHTML = `
+            <span class="nav-username">${user.username}</span>
+            ${user.is_admin ? '<a href="/admin" class="btn btn-sm btn-ghost nav-admin-btn">Admin</a>' : ''}
+            <button onclick="showSettingsModal()" class="btn btn-sm btn-ghost" title="Settings">&#9881;</button>
+            <button onclick="Auth.logout()" class="btn btn-sm btn-ghost">Logout</button>
+        `;
+    }
+
+    nav.appendChild(navUser);
+
+    if (!adminToken) {
+        const tzOptions = buildTimezoneOptions(user.timezone || 'UTC');
+        document.body.insertAdjacentHTML('beforeend', `
+            <div id="settings-modal" class="modal-overlay" style="display:none">
+                <div class="modal-box">
+                    <h2>Settings</h2>
+                    <div id="settings-msg" class="message"></div>
+
+                    <h3 class="settings-section-title">Timezone</h3>
+                    <div class="form-group" style="margin-bottom:0.5rem">
+                        <label for="tz-select">Your timezone</label>
+                        <select id="tz-select">${tzOptions}</select>
+                    </div>
+                    <div style="display:flex;gap:0.5rem;align-items:center;margin-bottom:1.5rem">
+                        <button class="btn btn-sm btn-ghost" onclick="detectTimezone()">Detect automatically</button>
+                        <button class="btn btn-primary btn-sm" onclick="submitTimezone()">Save Timezone</button>
+                    </div>
+
+                    <hr class="settings-divider">
+
+                    <h3 class="settings-section-title">Change Password</h3>
+                    <div class="form-group" style="margin-bottom:0.75rem">
+                        <label>Current Password</label>
+                        <input type="password" id="pw-current" autocomplete="current-password">
+                    </div>
+                    <div class="form-group" style="margin-bottom:0.75rem">
+                        <label>New Password</label>
+                        <input type="password" id="pw-new" autocomplete="new-password" minlength="6">
+                    </div>
+                    <div class="form-group" style="margin-bottom:1rem">
+                        <label>Confirm New Password</label>
+                        <input type="password" id="pw-confirm" autocomplete="new-password">
+                    </div>
+                    <div style="display:flex;gap:0.5rem;justify-content:flex-end">
+                        <button class="btn btn-ghost" onclick="hideSettingsModal()">Close</button>
+                        <button class="btn btn-primary" onclick="submitPasswordChange()">Update Password</button>
+                    </div>
+                </div>
+            </div>
+        `);
+    }
+}
+
+function showSettingsModal() {
+    document.getElementById('settings-modal').style.display = 'flex';
+    document.getElementById('settings-msg').className = 'message';
+    document.getElementById('pw-current').value = '';
+    document.getElementById('pw-new').value = '';
+    document.getElementById('pw-confirm').value = '';
+}
+
+function hideSettingsModal() {
+    document.getElementById('settings-modal').style.display = 'none';
+}
+
+function detectTimezone() {
+    const detected = Intl.DateTimeFormat().resolvedOptions().timeZone;
+    const sel = document.getElementById('tz-select');
+    if (sel) sel.value = detected;
+}
+
+async function submitTimezone() {
+    const tz = document.getElementById('tz-select').value;
+    const msgEl = document.getElementById('settings-msg');
+    try {
+        const data = await API.put('/api/auth/timezone', { timezone: tz });
+        Auth.setToken(data.access_token);
+        msgEl.textContent = `Timezone saved: ${tz.replace(/_/g, ' ')}`;
+        msgEl.className = 'message success visible';
+        setTimeout(() => { msgEl.className = 'message'; }, 3000);
+    } catch (err) {
+        msgEl.textContent = err.message;
+        msgEl.className = 'message error visible';
+    }
+}
+
+async function submitPasswordChange() {
+    const current = document.getElementById('pw-current').value;
+    const newPw   = document.getElementById('pw-new').value;
+    const confirm = document.getElementById('pw-confirm').value;
+    const msgEl   = document.getElementById('settings-msg');
+
+    if (newPw !== confirm) {
+        msgEl.textContent = 'New passwords do not match';
+        msgEl.className = 'message error visible';
+        return;
+    }
+    if (newPw.length < 6) {
+        msgEl.textContent = 'Password must be at least 6 characters';
+        msgEl.className = 'message error visible';
+        return;
+    }
+
+    try {
+        await API.post('/api/auth/change-password', {
+            current_password: current,
+            new_password: newPw,
+        });
+        msgEl.textContent = 'Password updated!';
+        msgEl.className = 'message success visible';
+        document.getElementById('pw-current').value = '';
+        document.getElementById('pw-new').value = '';
+        document.getElementById('pw-confirm').value = '';
+        setTimeout(() => { msgEl.className = 'message'; }, 3000);
+    } catch (err) {
+        msgEl.textContent = err.message;
+        msgEl.className = 'message error visible';
+    }
+}
+
+document.addEventListener('click', (e) => {
+    const modal = document.getElementById('settings-modal');
+    if (modal && e.target === modal) hideSettingsModal();
+});
+
+document.addEventListener('DOMContentLoaded', initNav);
--- a/nginx/html/js/summary.js
+++ b/nginx/html/js/summary.js
@@ -187,7 +187,7 @@ async function exportCSV() {
        a.href     = url;
        const now      = new Date();
        const fileDate = `${now.getFullYear()}-${String(now.getMonth()+1).padStart(2,'0')}-${String(now.getDate()).padStart(2,'0')}`;
-        a.download = `egg-tracker-${fileDate}.csv`;
+        a.download = `yolkbook-${fileDate}.csv`;
        a.click();
        URL.revokeObjectURL(url);

--- a/nginx/html/log.html
+++ b/nginx/html/log.html
@@ -3,13 +3,13 @@
 <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
-    <title>Log Eggs — Eggtracker</title>
+    <title>Log Eggs — Yolkbook</title>
    <link rel="icon" href="/favicon.svg" type="image/svg+xml">
    <link rel="stylesheet" href="/css/style.css">
 </head>
 <body>
    <nav class="nav">
-        <a class="nav-brand" href="/">🥚 <span>Eggtracker</span></a>
+        <a class="nav-brand" href="/">🥚 <span>Yolkbook</span></a>
        <ul class="nav-links">
            <li><a href="/">Dashboard</a></li>
            <li><a href="/log">Log Eggs</a></li>
@@ -66,7 +66,8 @@
        </div>
    </main>

-    <script src="/js/api.js"></script>
+    <script src="/js/api.js?v=3"></script>
+    <script src="/js/auth.js?v=3"></script>
    <script src="/js/log.js"></script>
 </body>
 </html>
--- a/nginx/html/login.html
+++ b/nginx/html/login.html
@@ -0,0 +1,161 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Login — Yolkbook</title>
+    <link rel="icon" href="/favicon.svg" type="image/svg+xml">
+    <link rel="stylesheet" href="/css/style.css">
+</head>
+<body class="login-body">
+    <div class="login-container">
+        <div class="login-brand">🥚 Yolkbook</div>
+
+        <!-- Sign In -->
+        <div class="card login-card" id="login-panel">
+            <h1 class="login-title">Sign In</h1>
+            <div id="login-msg" class="message"></div>
+            <form id="login-form">
+                <div class="form-group" style="margin-bottom:1rem">
+                    <label for="username">Username</label>
+                    <input type="text" id="username" autocomplete="username" required autofocus>
+                </div>
+                <div class="form-group" style="margin-bottom:1.5rem">
+                    <label for="password">Password</label>
+                    <input type="password" id="password" autocomplete="current-password" required>
+                </div>
+                <button type="submit" class="btn btn-primary" style="width:100%" id="login-btn">Sign In</button>
+            </form>
+            <p style="text-align:center;margin-top:1rem;font-size:0.9rem;color:var(--muted)">
+                No account? <a href="#" onclick="showRegister()">Create one</a>
+            </p>
+        </div>
+
+        <!-- Register -->
+        <div class="card login-card" id="register-panel" style="display:none">
+            <h1 class="login-title">Create Account</h1>
+            <div id="reg-msg" class="message"></div>
+            <form id="reg-form">
+                <div class="form-group" style="margin-bottom:1rem">
+                    <label for="reg-username">Username</label>
+                    <input type="text" id="reg-username" autocomplete="username" required minlength="2" maxlength="64">
+                </div>
+                <div class="form-group" style="margin-bottom:1rem">
+                    <label for="reg-password">Password</label>
+                    <input type="password" id="reg-password" autocomplete="new-password" required minlength="6" placeholder="min 6 characters">
+                </div>
+                <div class="form-group" style="margin-bottom:1.5rem">
+                    <label for="reg-confirm">Confirm Password</label>
+                    <input type="password" id="reg-confirm" autocomplete="new-password" required>
+                </div>
+                <button type="submit" class="btn btn-primary" style="width:100%" id="reg-btn">Create Account</button>
+            </form>
+            <p style="text-align:center;margin-top:1rem;font-size:0.9rem;color:var(--muted)">
+                Already have an account? <a href="#" onclick="showLogin()">Sign in</a>
+            </p>
+        </div>
+    </div>
+
+    <script>
+        // Redirect if already logged in
+        (function () {
+            const token = localStorage.getItem('token');
+            if (token) {
+                try {
+                    const payload = JSON.parse(atob(token.split('.')[1]));
+                    if (payload.exp > Date.now() / 1000) {
+                        window.location.href = '/';
+                        return;
+                    }
+                } catch (_) {}
+                localStorage.removeItem('token');
+            }
+        })();
+
+        function showLogin() {
+            document.getElementById('register-panel').style.display = 'none';
+            document.getElementById('login-panel').style.display = 'block';
+            document.getElementById('username').focus();
+        }
+
+        function showRegister() {
+            document.getElementById('login-panel').style.display = 'none';
+            document.getElementById('register-panel').style.display = 'block';
+            document.getElementById('reg-username').focus();
+        }
+
+        function showError(elId, text) {
+            const el = document.getElementById(elId);
+            el.textContent = text;
+            el.className = 'message error visible';
+        }
+
+        function showSuccess(elId, text) {
+            const el = document.getElementById(elId);
+            el.textContent = text;
+            el.className = 'message success visible';
+        }
+
+        // ── Login ──
+        document.getElementById('login-form').addEventListener('submit', async (e) => {
+            e.preventDefault();
+            const btn = document.getElementById('login-btn');
+            btn.disabled = true;
+            btn.textContent = 'Signing in…';
+            document.getElementById('login-msg').className = 'message';
+
+            const username = document.getElementById('username').value.trim();
+            const password = document.getElementById('password').value;
+
+            try {
+                const res = await fetch('/api/auth/login', {
+                    method: 'POST',
+                    headers: { 'Content-Type': 'application/json' },
+                    body: JSON.stringify({ username, password }),
+                });
+                const data = await res.json();
+                if (!res.ok) { showError('login-msg', data.detail || 'Login failed'); return; }
+                localStorage.setItem('token', data.access_token);
+                window.location.href = '/';
+            } catch (err) {
+                showError('login-msg', 'Could not reach the server. Please try again.');
+            } finally {
+                btn.disabled = false;
+                btn.textContent = 'Sign In';
+            }
+        });
+
+        // ── Register ──
+        document.getElementById('reg-form').addEventListener('submit', async (e) => {
+            e.preventDefault();
+            const btn = document.getElementById('reg-btn');
+            const username = document.getElementById('reg-username').value.trim();
+            const password = document.getElementById('reg-password').value;
+            const confirm  = document.getElementById('reg-confirm').value;
+
+            if (password !== confirm) { showError('reg-msg', 'Passwords do not match'); return; }
+
+            btn.disabled = true;
+            btn.textContent = 'Creating account…';
+            document.getElementById('reg-msg').className = 'message';
+
+            try {
+                const res = await fetch('/api/auth/register', {
+                    method: 'POST',
+                    headers: { 'Content-Type': 'application/json' },
+                    body: JSON.stringify({ username, password }),
+                });
+                const data = await res.json();
+                if (!res.ok) { showError('reg-msg', data.detail || 'Registration failed'); return; }
+                localStorage.setItem('token', data.access_token);
+                window.location.href = '/';
+            } catch (err) {
+                showError('reg-msg', 'Could not reach the server. Please try again.');
+            } finally {
+                btn.disabled = false;
+                btn.textContent = 'Create Account';
+            }
+        });
+    </script>
+</body>
+</html>
--- a/nginx/html/summary.html
+++ b/nginx/html/summary.html
@@ -3,13 +3,13 @@
 <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
-    <title>Summary — Eggtracker</title>
+    <title>Summary — Yolkbook</title>
    <link rel="icon" href="/favicon.svg" type="image/svg+xml">
    <link rel="stylesheet" href="/css/style.css">
 </head>
 <body>
    <nav class="nav">
-        <a class="nav-brand" href="/">🥚 <span>Eggtracker</span></a>
+        <a class="nav-brand" href="/">🥚 <span>Yolkbook</span></a>
        <ul class="nav-links">
            <li><a href="/">Dashboard</a></li>
            <li><a href="/log">Log Eggs</a></li>
@@ -68,7 +68,8 @@
    </main>

    <script src="https://cdn.jsdelivr.net/npm/chart.js@4.4.0/dist/chart.umd.min.js"></script>
-    <script src="/js/api.js?v=2"></script>
+    <script src="/js/api.js?v=3"></script>
+    <script src="/js/auth.js?v=3"></script>
    <script src="/js/summary.js?v=2"></script>
 </body>
 </html>