diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..7f93ebf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+venv
+__pycache__
diff --git a/main.py b/main.py
new file mode 100755
index 0000000..4caac51
--- /dev/null
+++ b/main.py
@@ -0,0 +1,134 @@
+from fastapi import FastAPI, Depends, HTTPException
+from sqlmodel import SQLModel, Session, create_engine, select
+from models import Elevator, Demand, Floor
+import uvicorn
+
+app = FastAPI(title="Elevator Model")
+
+DATABASE_URL = "sqlite:///./elevator.db"
+engine = create_engine(DATABASE_URL)
+
+def get_session():
+    with Session(engine) as session:
+        yield session
+
+SQLModel.metadata.create_all(engine)
+
+@app.post("/elevator/")
+def create_elevator(elevator: Elevator, session: Session = Depends(get_session)):
+    db_elevator = Elevator.model_validate(elevator)
+    session.add(db_elevator)
+    session.commit()
+    for floor in range(db_elevator.min_floor, db_elevator.max_floor+1):
+        db_floor = Floor(floor=floor, elevator_id=db_elevator.id)
+        session.add(db_floor)
+        session.commit()
+    session.refresh(db_elevator)
+    return db_elevator
+
+@app.get("/elevator/{elevator_id}")
+def get_elevator_status(elevator_id: int, session: Session = Depends(get_session)):
+    elevator = session.get(Elevator, elevator_id)
+    if not elevator:
+        raise HTTPException(status_code=404, detail="Elevator not found")
+    return elevator
+
+@app.get("floors/{elevator_id}")
+def get_floors_status(elevator_id: int, session: Session = Depends(get_session)):
+    statement = select(Floor) \
+        .where(Floor.elevator_id == elevator_id) \
+        .where(Floor.is_demanded == True)
+    floors = session.exec(statement)
+    if len(floors) == 0:
+        raise HTTPException(status_code=404, detail="No floors demanded.")
+    return floors
+
+def get_next_stop(elevator: Elevator, session: Session = Depends(get_session)):
+    if elevator.motion_status == "ascending":
+        next_up = session.exec(select(Floor) \
+            .where(Floor.elevator_id == elevator.id) \
+            .where(Floor.floor > elevator.current_floor) \
+            .order_by(Floor.floor)).first()
+        if next_up:
+            return next_up.floor
+        else:
+            next_down = session.exec(select(Floor) \
+                .where(Floor.elevator_id == elevator.id) \
+                .where(Floor.floor < elevator.current_floor) \
+                .order_by(Floor.floor)).last()
+            return next_down
+    elif elevator.motion_status == "ascending":
+        next_down = session.exec(select(Floor) \
+            .where(Floor.elevator_id == elevator.id) \
+            .where(Floor.floor < elevator.current_floor) \
+            .order_by(Floor.floor)).last()
+        if next_down:
+            return next_down.floor
+        else:
+            next_up = session.exec(select(Floor) \
+                .where(Floor.elevator_id == elevator.id) \
+                .where(Floor.floor > elevator.current_floor) \
+                .order_by(Floor.floor)).first()
+            return next_up.floor
+    else:
+        next = session.exec(select(Floor) \
+            .where(Floor.elevator_id == elevator.id)).first()
+        return next.floor
+
+def change_demand_status(elevator_id: int, floor: int, new_status: bool, session: Session = Depends(get_session)):
+    statement = select(Floor) \
+        .where(Floor.elevator_id == elevator_id)\
+        .where(Floor.floor == floor)
+    floor = session.exec(statement).first()
+    if floor:
+        raise HTTPException(status_code=404, detail="Floor not found for the elevator.")
+    
+    floor.is_demanded = new_status
+    session.add(floor)
+    session.commit()
+
+@app.post("elevator/{elevator_id}")
+def move_elevator(elevator_id: int, session: Session = Depends(get_session)):
+    # moves elevator to the next stop
+    elevator = session.get(Elevator, elevator_id)
+    if not elevator:
+        raise HTTPException(status_code=404, detail="Elevator not found")
+    if elevator.next_stop != None:
+        elevator.current_floor = elevator.next_stop
+        elevator.next_stop = get_next_stop(elevator)
+        change_demand_status(elevator.elevator_id, elevator.current_floor, False)
+        if elevator.next_stop:
+            if elevator.next_stop > elevator.current_floor:
+                elevator.motion_status = "ascending"
+            else:
+                elevator.motion_status = "descending"
+        elevator.motion_status = "still"
+        session.add(elevator)
+        session.commit()
+        session.refresh(elevator)
+    else:
+        raise HTTPException(status_code=400, detail="No floors demanded")
+    return elevator
+
+@app.post("/demand/")
+def create_demand(demand: Demand, session: Session = Depends(get_session)):
+    db_demand = Demand.model_validate(demand)
+    db_floor = session.exec(select(Floor)
+                            .where(Floor.elevator_id == db_demand.elevator_id)
+                            .where(Floor.floor == db_demand.target_floor)).first()
+    db_floor.is_demanded = True
+    session.add(db_floor)
+    session.add(db_demand)
+    session.commit()
+    session.refresh(db_demand)
+    return db_demand
+
+@app.get("/demand/{demand_id}")
+def get_demand(demand_id: int, session: Session = Depends(get_session)):
+    demand = session.get(Demand, demand_id)
+    if not demand:
+        raise HTTPException(status_code=404, detail="Demand not found")
+    return demand
+
+if __name__ == "__main__":
+    uvicorn.run("main:app", host="0.0.0.0", port=8000, reload=True)
diff --git a/models.py b/models.py
new file mode 100755
index 0000000..801d5b4
--- /dev/null
+++ b/models.py
@@ -0,0 +1,33 @@
+from sqlmodel import Field, SQLModel
+import datetime
+
+
+class Elevator(SQLModel, table=True):
+    id: int | None = Field(default=None, primary_key=True)
+    max_floor: int = Field(default=10)
+    min_floor: int = Field(default=0)
+    current_floor: int = Field(default=0)
+    next_stop: int | None = Field(default=0)
+    motion_status: str = Field(default="still")
+    # min_floor <= current_floor <= max_floor
+    # motion_status = "still" | "ascending" | "descending"
+
+class Floor(SQLModel, table=True):
+    id: int | None = Field(default=None, primary_key=True)
+    floor: int = Field(default=None)
+    elevator_id: int = Field(default=None, foreign_key="elevator.id")
+    is_demanded: bool = Field(default=False)
+
+class Demand(SQLModel, table=True):
+    id: int | None = Field(default=None, primary_key=True)
+    elevator_id: int = Field(default=None, foreign_key="elevator.id")
+    created_at: datetime.datetime = Field(default_factory=datetime.datetime.now)
+    source: str = Field(default=None)
+    target_floor: int = Field(default=None)
+
+    # source = "inside" | "outside"
+    # elevator_id must exist
+    # elevator.min_floor <= target_floor <= elevator.max_floor
+
+
+
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..485bac5
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,26 @@
+annotated-types==0.7.0
+anyio==4.9.0
+certifi==2025.1.31
+charset-normalizer==3.4.1
+click==8.1.8
+fastapi==0.115.12
+greenlet==3.1.1
+h11==0.14.0
+httpcore==1.0.7
+httpx==0.28.1
+idna==3.10
+iniconfig==2.1.0
+packaging==24.2
+pluggy==1.5.0
+pydantic==2.11.2
+pydantic_core==2.33.1
+pytest==8.3.5
+requests==2.32.3
+sniffio==1.3.1
+SQLAlchemy==2.0.40
+sqlmodel==0.0.24
+starlette==0.46.1
+typing-inspection==0.4.0
+typing_extensions==4.13.1
+urllib3==2.3.0
+uvicorn==0.34.0
diff --git a/tests.py b/tests.py
new file mode 100644
index 0000000..4a5da5a
--- /dev/null
+++ b/tests.py
@@ -0,0 +1,116 @@
+import pytest
+from fastapi.testclient import TestClient
+from sqlmodel import Session, SQLModel, create_engine
+from sqlalchemy.pool import StaticPool
+
+from main import app, get_session
+from models import Elevator, Floor, Demand
+
+# Set up in-memory database for testing
+@pytest.fixture
+def client():
+    engine = create_engine(
+        "sqlite://:memory:"
+    )
+    SQLModel.metadata.create_all(engine)
+
+    def get_session_override():
+        with Session(engine) as session:
+            yield session
+
+    app.dependency_overrides[get_session] = get_session_override
+    client = TestClient(app)
+    return client
+
+@pytest.fixture
+def db_session():
+    engine = create_engine(
+        "sqlite://:memory:"
+    )
+    SQLModel.metadata.create_all(engine)
+    with Session(engine) as session:
+        yield session
+
+def test_create_elevator(client):
+    response = client.post(
+        "/elevator/",
+        json={"max_floor": 10, "min_floor": -2, "current_floor": 0}
+    )
+    assert response.status_code == 200
+    data = response.json()
+    print(response)
+    assert data["id"] is not None
+    assert data["max_floor"] == 10
+    assert data["min_floor"] == -2
+    assert data["current_floor"] == 0
+    assert data["motion_status"] == "still"
+
+def test_get_existing_elevator(client):
+    create_response = client.post(
+        "/elevator/",
+        json={"max_floor": 10, "min_floor": 0, "current_floor": 0}
+    )
+    elevator_id = create_response.json()["id"]
+    
+    response = client.get(f"/elevator/{elevator_id}")
+    assert response.status_code == 200
+    data = response.json()
+    assert data["id"] == elevator_id
+    assert data["max_floor"] == 10
+    assert data["min_floor"] == 0
+
+def test_get_nonexistent_elevator(client):
+    response = client.get("/elevator/999")
+    assert response.status_code == 404
+    assert response.json()["detail"] == "Elevator not found"
+
+def test_create_demand(client):
+    create_elevator_response = client.post(
+        "/elevator/",
+        json={"max_floor": 10, "min_floor": 0, "current_floor": 0}
+    )
+    elevator_id = create_elevator_response.json()["id"]
+    
+    # Then create a demand
+    response = client.post(
+        "/demand/",
+        json={
+            "elevator_id": elevator_id,
+            "source": "inside",
+            "target_floor": 5
+        }
+    )
+    assert response.status_code == 200
+    data = response.json()
+    assert data["id"] is not None
+    assert data["elevator_id"] == elevator_id
+    assert data["source"] == "inside"
+    assert data["target_floor"] == 5
+
+def test_get_demand(client):
+    create_elevator_response = client.post(
+        "/elevator/",
+        json={"max_floor": 10, "min_floor": 0, "current_floor": 0}
+    )
+    elevator_id = create_elevator_response.json()["id"]
+    
+    create_demand_response = client.post(
+        "/demand/",
+        json={
+            "elevator_id": elevator_id,
+            "source": "outside",
+            "target_floor": 3
+        }
+    )
+    demand_id = create_demand_response.json()["id"]
+    
+    response = client.get(f"/demand/{demand_id}")
+    assert response.status_code == 200
+    data = response.json()
+    assert data["id"] == demand_id
+    assert data["elevator_id"] == elevator_id
+    assert data["target_floor"] == 3
+
+def test_get_nonexistent_demand(client):
+    response = client.get("/demand/999")
+    assert response.status_code == 404
diff --git a/thinking-process.md b/thinking-process.md
new file mode 100755
index 0000000..ef7b19d
--- /dev/null
+++ b/thinking-process.md
@@ -0,0 +1,25 @@
+# Goal
+Model elevator problem in order to store proper data to create machine learning models.
+
+# What are we optimizing for in a basic model?
+- get the optimized resting floor?
+- (time?, cost?)
+
+# Tasks
+- [ ] Model the problem into a storage schema (SQL DB schema or whatever you prefer)
+- [ ] CRUD some data
+- [ ] Add some flair with a business rule or two
+- [ ] Have the data in a suitable format to feed to a prediction training algorithm
+
+
+### Marking 
+- storage (sqlite, docker container, ...)
+- tests
+
+# Stack
+- sqlite (fast prototype)
+- fastapi
+- sqlmodel (sqlalchemy + pydantic)
+
+
+