Added pytest configuration and first 4 unit tests

app/utils/database.py

@@ -1,12 +1,12 @@
 import os
 import boto3
+from app.models import Base
 from .constants import AWS_REGION
 from sqlalchemy import create_engine
 from sqlalchemy.ext.declarative import declarative_base
 from sqlalchemy.orm import sessionmaker
 from functools import lru_cache
 
-@lru_cache(maxsize=1)
 def get_db_credentials():
     """Fetch and cache DB credentials from environment or SSM Parameter Store"""
     if os.getenv("MOCK_AUTH", "").lower() == "true":
@@ -25,14 +25,14 @@ def get_db_credentials():
     except Exception as e:
         raise RuntimeError(f"Failed to fetch DB credentials from SSM: {str(e)}")
 
+# Initialize engine and session maker
 engine = create_engine(get_db_credentials())
-
-# Create all tables
-from app.models import Base
-Base.metadata.create_all(bind=engine)
-
 SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
 
+def init_db():
+    """Initialize database by creating all tables"""
+    Base.metadata.create_all(bind=engine)
+
 def get_db():
     """Dependency for getting database session"""
     db = SessionLocal()