FastAPI, column computers.id does not exist - fastapi

Question

Here is the code of my main.py in FastAPI:
from typing import List, Union
import datetime
import databases
import sqlalchemy
from fastapi import FastAPI
from pydantic import BaseModel
DATABASE_URL = "postgresql://username:password#localhost/collector"
database = databases.Database(DATABASE_URL)
metadata = sqlalchemy.MetaData()
computers = sqlalchemy.Table(
"computers",
metadata,
sqlalchemy.Column("id", sqlalchemy.Integer, primary_key=True, index=True),
sqlalchemy.Column("computername", sqlalchemy.String),
sqlalchemy.Column("computerip", sqlalchemy.String),
sqlalchemy.Column("computerexternalip", sqlalchemy.String),
sqlalchemy.Column("time", sqlalchemy.DateTime),
)
engine = sqlalchemy.create_engine(
DATABASE_URL
)
metadata.create_all(engine)
class ComputerBase(BaseModel):
computername: str
computerip: str
computerexternalip: str
time: str = datetime.datetime
class ComputerIn(ComputerBase):
pass
class Computer(ComputerBase):
id: int
class Config:
orm_mode = True
app = FastAPI()
#app.on_event("startup")
async def startup():
await database.connect()
#app.on_event("shutdown")
async def shutdown():
await database.disconnect()
#app.get("/computers/", response_model=List[Computer])
async def read_computers():
query = computers.select()
print(query)
return await database.fetch_all(query)
#app.post("/computers/", response_model=Computer)
async def create_computer(computer: ComputerIn):
current_time = datetime.datetime.utcnow
query = computers.insert().values(computername=computer.computername, computerip=computer.computerip, computerexternalip=computer.computerexternalip, time=current_time)
last_record_id = await database.execute(query)
return {**computer.dict(), "id": last_record_id}
When I go on https://localhost:8000/computers, I get this error:
asyncpg.exceptions.UndefinedColumnError: column computers.id does not
exist
Which I don't understand since I declare a table names "computers" with an id column at the begining of my code.
Any idea ?
Thank you