diff --git a/.gitignore b/.gitignore
index bee8a64..be2ac13 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 __pycache__
+gatekeeper.db
diff --git a/main.py b/main.py
index 8e3dfea..200e02b 100644
--- a/main.py
+++ b/main.py
@@ -1,7 +1,56 @@
-from fastapi import FastAPI
+from fastapi import FastAPI, Depends, HTTPException
+from sqlalchemy.orm import Session
+from typing import List
+
+from models import User
+from schemas import UserCreate, User as UserSchema
+from services import SessionLocal, engine
 
 app = FastAPI()
 
-@app.get("/")
-async def root():
-    return {"message": "Hello World"}
\ No newline at end of file
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
+
+@app.post("/users/", response_model=UserSchema)
+def create_user(user: UserCreate, db: Session = Depends(get_db)):
+    db_user = User(**user.dict())
+    db.add(db_user)
+    db.commit()
+    db.refresh(db_user)
+    return db_user
+
+@app.get("/users/", response_model=List[UserSchema])
+def read_users(db: Session = Depends(get_db)):
+    users = db.query(User).all()
+    return users
+
+@app.get("/users/{user_id}", response_model=UserSchema)
+def read_user(user_id: int, db: Session = Depends(get_db)):
+    db_user = db.query(User).filter(User.id == user_id).first()
+    if db_user is None:
+        raise HTTPException(status_code=404, detail="User not found")
+    return db_user
+
+@app.put("/users/{user_id}", response_model=UserSchema)
+def update_user(user_id: int, user: UserCreate, db: Session = Depends(get_db)):
+    db_user = db.query(User).filter(User.id == user_id).first()
+    if db_user is None:
+        raise HTTPException(status_code=404, detail="User not found")
+    for key, value in user.dict().items():
+        setattr(db_user, key, value)
+    db.commit()
+    db.refresh(db_user)
+    return db_user
+
+@app.delete("/users/{user_id}")
+def delete_user(user_id: int, db: Session = Depends(get_db)):
+    db_user = db.query(User).filter(User.id == user_id).first()
+    if db_user is None:
+        raise HTTPException(status_code=404, detail="User not found")
+    db.delete(db_user)
+    db.commit()
+    return {"message": "User deleted successfully"}
\ No newline at end of file
diff --git a/models.py b/models.py
new file mode 100644
index 0000000..0fdf035
--- /dev/null
+++ b/models.py
@@ -0,0 +1,13 @@
+from sqlalchemy import Column, Integer, String, Boolean
+from sqlalchemy.ext.declarative import declarative_base
+
+Base = declarative_base()
+
+class User(Base):
+    __tablename__ = "users"
+
+    id = Column(Integer, primary_key=True, index=True)
+    name = Column(String, index=True)
+    email = Column(String, nullable=True)
+    password = Column(String)
+    is_admin = Column(Boolean, default=False)
\ No newline at end of file
diff --git a/schemas.py b/schemas.py
new file mode 100644
index 0000000..6e35a63
--- /dev/null
+++ b/schemas.py
@@ -0,0 +1,14 @@
+from pydantic import BaseModel
+
+class UserBase(BaseModel):
+    name: str
+    email: str | None
+    is_admin: bool
+
+class UserCreate(UserBase):
+    password: str
+    
+class User(UserBase):
+    id: int
+    class Config:
+        from_attributes = True
\ No newline at end of file
diff --git a/services.py b/services.py
new file mode 100644
index 0000000..8fc97bb
--- /dev/null
+++ b/services.py
@@ -0,0 +1,12 @@
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+
+SQLALCHEMY_DATABASE_URL = "sqlite:///./gatekeeper.db"
+
+engine = create_engine(
+    SQLALCHEMY_DATABASE_URL, connect_args={"check_same_thread": False}
+)
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+from models import Base
+Base.metadata.create_all(bind=engine)
\ No newline at end of file