Initial commit: Parking Manager

Features:
- Manager-centric parking spot management
- Fair assignment algorithm (parking/presence ratio)
- Presence tracking calendar
- Closing days (specific & weekly recurring)
- Guarantees and exclusions
- Authelia/LLDAP integration for SSO

Stack:
- FastAPI backend
- SQLite database
- Vanilla JS frontend
- Docker deployment

database/connection.py

@@ -0,0 +1,39 @@
+"""
+Database Connection Management
+"""
+from contextlib import contextmanager
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+from app import config
+
+engine = create_engine(
+    config.DATABASE_URL,
+    connect_args={"check_same_thread": False} if "sqlite" in config.DATABASE_URL else {}
+)
+
+SessionLocal = sessionmaker(bind=engine)
+
+
+def get_db():
+    """Database session for FastAPI dependency injection"""
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
+
+
+@contextmanager
+def get_db_session():
+    """Database session for regular Python code"""
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
+
+
+def init_db():
+    """Create all tables"""
+    from database.models import Base
+    Base.metadata.create_all(bind=engine)