added postgres support

Dockerfile

@@ -23,7 +23,9 @@ COPY pyproject.toml README.md ./
 COPY src/ ./src/
 
 # Install Python dependencies including all optional dependencies
-# This makes the image self-contained and ready for any configuration
+# This makes the image self-contained and ready for any configuration:
+# - Redis support (redis extra)
+# - PostgreSQL support (postgres extra)
 RUN uv sync --no-dev --all-extras
 
 # Add virtual environment to PATH

README.md

@@ -82,12 +82,13 @@ uv run uvicorn src.baby_monitor.main:app --reload --host 0.0.0.0 --port 8000
 ### Environment Variables
 
 | Variable         | Default      | Description                                   |
-| ---------------- | ------------ | ------------------------------------------- |
+| ---------------- | ------------ | --------------------------------------------- |
 | `ENVIRONMENT`    | `production` | Set to `development` to enable API docs       |
 | `ADMIN_PASSWORD` | _(required)_ | Admin user password                           |
 | `ADMIN_USERNAME` | `admin`      | Admin username                                |
-| `DATA_DIR`       | `/data`      | Directory for SQLite database               |
+| `DATA_DIR`       | `/data`      | Directory for SQLite database (SQLite only)   |
 | `REDIS_URI`      | _(optional)_ | Redis connection URI for distributed tokens   |
+| `POSTGRES_URI`   | _(optional)_ | PostgreSQL connection URI for database storage|
 
 ### Storage Options
 
@@ -96,18 +97,26 @@ uv run uvicorn src.baby_monitor.main:app --reload --host 0.0.0.0 --port 8000
 - Automatic setup, no configuration needed
 - Data stored in `/data/baby_monitor.db`
 - Perfect for single-server deployments
+- Timezone-aware datetimes stored as naive UTC
 
-**Redis (Optional)**
+**Redis (Optional - Token Storage)**
 
 ```bash
-# Enable Redis token storage
+# Enable Redis token storage for distributed deployments
 export REDIS_URI=redis://localhost:6379
 ```
 
-**PostgreSQL (Future)**
+**PostgreSQL (Optional - Database)**
 
-- Repository interface ready
-- Swap implementation in `dependencies.py`
+```bash
+# Enable PostgreSQL for production database
+export POSTGRES_URI=postgresql://user:password@localhost:5432/baby_monitor
+```
+
+- Supports timezone-aware datetimes natively
+- Recommended for production deployments
+- Better performance for concurrent access
+- Supports database migrations and backups
 
 ## 📁 Project Structure
 

docker-compose.prod.yml

@@ -17,7 +17,7 @@ services:
       # Use Redis for token storage
       - REDIS_URI=redis://redis:6379/0
       # Use PostgreSQL for database
-      - DATABASE_URL=postgresql://baby_monitor:securepassword@postgres:5432/baby_monitor_db
+      - POSTGRES_URI=postgresql://baby_monitor:securepassword@postgres:5432/baby_monitor_db
     command: ["--host", "0.0.0.0", "--port", "8000"]
     restart: unless-stopped
     depends_on:

src/baby_monitor/models/db/child.py

@@ -19,9 +19,11 @@ class Child(Base):
 
     id = Column(Integer, primary_key=True, index=True)
     name = Column(String, nullable=False)
-    birth_time = Column(DateTime, nullable=False)
+    birth_time = Column(DateTime(timezone=True), nullable=False)
     birth_weight = Column(Float, nullable=False)  # in grams
-    created_at = Column(DateTime, default=datetime.utcnow, nullable=False)
+    created_at = Column(
+        DateTime(timezone=True), default=datetime.utcnow, nullable=False
+    )
 
     def __repr__(self) -> str:
         return f"<Child(id={self.id}, name='{self.name}')>"

src/baby_monitor/models/db/child_parent.py

@@ -20,7 +20,9 @@ class ChildParent(Base):
     id = Column(Integer, primary_key=True, index=True)
     child_id = Column(Integer, ForeignKey("children.id"), nullable=False)
     user_id = Column(Integer, ForeignKey("users.id"), nullable=False)
-    created_at = Column(DateTime, default=datetime.utcnow, nullable=False)
+    created_at = Column(
+        DateTime(timezone=True), default=datetime.utcnow, nullable=False
+    )
 
     def __repr__(self) -> str:
         return (

src/baby_monitor/models/db/diaper_change.py

@@ -19,12 +19,14 @@ class DiaperChange(Base):
 
     id = Column(Integer, primary_key=True, index=True)
     child_id = Column(Integer, ForeignKey("children.id"), nullable=False)
-    change_time = Column(DateTime, nullable=False)
+    change_time = Column(DateTime(timezone=True), nullable=False)
     poop_amount = Column(String, nullable=True)  # stores PoopAmount enum
     poop_color = Column(String, nullable=True)  # stores PoopColor enum
     pee_amount = Column(String, nullable=True)  # stores PeeAmount enum
     pee_color = Column(String, nullable=True)  # stores PeeColor enum
-    created_at = Column(DateTime, default=datetime.now(UTC), nullable=False)
+    created_at = Column(
+        DateTime(timezone=True), default=datetime.now(UTC), nullable=False
+    )
 
     def __repr__(self) -> str:
         return f"<DiaperChange(id={self.id}, child_id={self.child_id})>"

src/baby_monitor/models/db/feeding.py

@@ -19,10 +19,12 @@ class Feeding(Base):
 
     id = Column(Integer, primary_key=True, index=True)
     child_id = Column(Integer, ForeignKey("children.id"), nullable=False)
-    start_time = Column(DateTime, nullable=False)
-    end_time = Column(DateTime, nullable=True)
+    start_time = Column(DateTime(timezone=True), nullable=False)
+    end_time = Column(DateTime(timezone=True), nullable=True)
     feeding_type = Column(String, nullable=False)  # stores FeedingType enum
-    created_at = Column(DateTime, default=datetime.now(UTC), nullable=False)
+    created_at = Column(
+        DateTime(timezone=True), default=datetime.now(UTC), nullable=False
+    )
 
     def __repr__(self) -> str:
         return f"<Feeding(id={self.id}, child_id={self.child_id})>"

src/baby_monitor/models/db/sleep.py

@@ -19,9 +19,11 @@ class Sleep(Base):
 
     id = Column(Integer, primary_key=True, index=True)
     child_id = Column(Integer, ForeignKey("children.id"), nullable=False)
-    start_time = Column(DateTime, nullable=False)
-    end_time = Column(DateTime, nullable=True)
-    created_at = Column(DateTime, default=datetime.now(UTC), nullable=False)
+    start_time = Column(DateTime(timezone=True), nullable=False)
+    end_time = Column(DateTime(timezone=True), nullable=True)
+    created_at = Column(
+        DateTime(timezone=True), default=datetime.now(UTC), nullable=False
+    )
 
     def __repr__(self) -> str:
         return f"<Sleep(id={self.id}, child_id={self.child_id})>"

src/baby_monitor/models/db/user.py

@@ -21,7 +21,9 @@ class User(Base):
     username = Column(String, unique=True, index=True, nullable=False)
     hashed_password = Column(String, nullable=False)
     is_admin = Column(Boolean, default=False, nullable=False)
-    created_at = Column(DateTime, default=datetime.utcnow, nullable=False)
+    created_at = Column(
+        DateTime(timezone=True), default=datetime.utcnow, nullable=False
+    )
 
     def __repr__(self) -> str:
         return f"<User(id={self.id}, username='{self.username}')>"

src/baby_monitor/repositories/dependencies/get_database.py

@@ -10,12 +10,24 @@ from sqlalchemy.orm import declarative_base, sessionmaker, Session
 if TYPE_CHECKING:
     from sqlalchemy.orm import DeclarativeBase
 
-# Database directory
+# Database directory (used for SQLite)
 DATA_DIR = Path(os.getenv("DATA_DIR", "/data"))
 
-# SQLite database URL
-DATABASE_URL = f"sqlite:///{DATA_DIR}/baby_monitor.db"
+# Check for PostgreSQL URI, otherwise use SQLite
+POSTGRES_URI = os.getenv("POSTGRES_URI")
 
+if POSTGRES_URI:
+    # Use PostgreSQL
+    DATABASE_URL = POSTGRES_URI
+    # PostgreSQL doesn't need special connect_args
+    engine = create_engine(
+        DATABASE_URL,
+        echo=False,  # Set to True for SQL query logging
+        pool_pre_ping=True,  # Verify connections before using them
+    )
+else:
+    # Use SQLite (default)
+    DATABASE_URL = f"sqlite:///{DATA_DIR}/baby_monitor.db"
     # Create engine with check_same_thread=False for SQLite
     engine = create_engine(
         DATABASE_URL,
@@ -78,15 +90,23 @@ def init_db() -> None:
     # This must be done before create_all() is called
     from baby_monitor.models.db.user import User  # noqa: F401
     from baby_monitor.models.db.child import Child  # noqa: F401
-    from baby_monitor.models.db.child_parent import ChildParent  # noqa: F401
+    from baby_monitor.models.db.child_parent import (  # noqa: F401
+        ChildParent,
+    )
     from baby_monitor.models.db.feeding import Feeding  # noqa: F401
-    from baby_monitor.models.db.diaper_change import DiaperChange  # noqa: F401
+    from baby_monitor.models.db.diaper_change import (  # noqa: F401
+        DiaperChange,
+    )
     from baby_monitor.models.db.sleep import Sleep  # noqa: F401
     from baby_monitor.models.invitation import Invitation  # noqa: F401
-    from baby_monitor.models.child_invitation import ChildInvitation  # noqa: F401
+    from baby_monitor.models.child_invitation import (  # noqa: F401
+        ChildInvitation,
+    )
 
-    # Ensure data directory exists
+    # Ensure data directory exists (only needed for SQLite)
+    if not POSTGRES_URI:
         DATA_DIR.mkdir(parents=True, exist_ok=True)
+
     Base.metadata.create_all(bind=engine)
 
     # Create admin user if it doesn't exist