initialize backend with FastAPI and Docker setup

app/database.py

@@ -0,0 +1,38 @@
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+from sqlalchemy.orm import declarative_base
+
+from dotenv import load_dotenv
+import os
+
+load_dotenv()
+
+DATABASE_URL = (
+    f"mysql+pymysql://"
+    f"{os.getenv('DB_USER')}:"
+    f"{os.getenv('DB_PASSWORD')}@"
+    f"{os.getenv('DB_HOST')}:"
+    f"{os.getenv('DB_PORT')}/"
+    f"{os.getenv('DB_NAME')}"
+)
+
+engine = create_engine(
+    DATABASE_URL,
+    pool_pre_ping=True
+)
+
+SessionLocal = sessionmaker(
+    autocommit=False,
+    autoflush=False,
+    bind=engine
+)
+
+Base = declarative_base()
+
+
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()