Better integration of sqlite3 database

backend/app/routers/contact.py

@@ -1,26 +1,31 @@
-# app/routers/contact.py
-from fastapi import APIRouter, HTTPException, status
+from fastapi import APIRouter, HTTPException, status, Depends
+from sqlalchemy.orm import Session
 from typing import List
-from app.data.data import contacts
-from app.models import ContactPerson
+from app.schemas import ContactPerson, ContactPersonCreate
+from app.models import ContactPerson as ContactPersonModel
+from app.dependencies import get_db
 
 router = APIRouter()
 
 @router.get("/", response_model=List[ContactPerson])
-async def get_contacts():
-    return contacts
+async def get_contacts(db: Session = Depends(get_db)):
+    return db.query(ContactPersonModel).all()
 
 @router.post("/", response_model=ContactPerson, status_code=status.HTTP_201_CREATED)
-async def create_contact(contact: ContactPerson):
-    if any(c.email == contact.email for c in contacts):
+async def create_contact(contact: ContactPersonCreate, db: Session = Depends(get_db)):
+    if db.query(ContactPersonModel).filter(ContactPersonModel.email == contact.email).first():
         raise HTTPException(
             status_code=status.HTTP_400_BAD_REQUEST,
             detail="This contact already exists."
         )
-    if contacts:
-        max_id = max(c.id for c in contacts)
-        contact.id = max_id + 1 if contact.id is None else contact.id
-    else:
-        contact.id = 1 if contact.id is None else contact.id
-    contacts.append(contact)
-    return contact
+
+    db_contact = ContactPersonModel(
+        firstname=contact.firstname,
+        lastname=contact.lastname,
+        phone_number=contact.phone_number,
+        email=contact.email
+    )
+    db.add(db_contact)
+    db.commit()
+    db.refresh(db_contact)
+    return db_contact