little of backend

backend/app/db/database.py

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+from sqlalchemy import create_engine
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker
+import os
+
+POSTGRES_USER = os.environ.get("POSTGRES_USER", "user")
+POSTGRES_PASSWORD = os.environ.get("POSTGRES_PASSWORD", "password")
+POSTGRES_DB = os.environ.get("POSTGRES_DB", "db")
+POSTGRES_HOST = os.environ.get("POSTGRES_HOST", "postgres")
+
+
+SQLALCHEMY_DATABASE_URL = (
+    f"postgresql://{POSTGRES_USER}:{POSTGRES_PASSWORD}@{POSTGRES_HOST}/{POSTGRES_DB}"
+)
+
+engine = create_engine(SQLALCHEMY_DATABASE_URL)
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+Base = declarative_base()

backend/app/db/models.py

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+from sqlalchemy import Boolean, Column, ForeignKey, Integer, String
+from sqlalchemy.orm import relationship
+
+from .database import Base
+
+
+class User(Base):
+    __tablename__ = "users"
+
+    id = Column(Integer, primary_key=True)
+    email = Column(String, unique=True, index=True)
+    hashed_password = Column(String)
+    is_active = Column(Boolean, default=True)

backend/app/db/schemas.py

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+from typing import Union
+from pydantic import BaseModel
+
+
+class UserBase(BaseModel):
+    username: str
+    email: str
+
+
+class UserCreate(UserBase):
+    password: str
+
+
+class User(UserBase):
+    id: int
+    is_active: bool
+
+    class Config:
+        orm_mode = True