Remove PostgreSQL and move to SQLite3

backend/app/routes/setup.py

@@ -0,0 +1,58 @@
+import re
+
+from fastapi import APIRouter, Depends, HTTPException, Response
+from sqlalchemy.orm import Session
+
+from ..db import get_db
+from ..models import Role, User
+from ..security import hash_password, make_session_value, set_session
+
+router = APIRouter(prefix="/setup", tags=["setup"])
+
+
+def _has_admin(db: Session) -> bool:
+    return db.query(User).filter(User.role == Role.admin.value).first() is not None
+
+
+@router.get("/status")
+def setup_status(db: Session = Depends(get_db)):
+    return {"setup_required": not _has_admin(db)}
+
+
+@router.post("/admin")
+def create_initial_admin(
+    data: dict,
+    resp: Response,
+    db: Session = Depends(get_db),
+):
+    # The setup endpoint is only open until the first admin exists.
+    if _has_admin(db):
+        raise HTTPException(status_code=409, detail="setup already completed")
+
+    email = (data.get("email") or "").lower().strip()
+    display_name = (data.get("display_name") or "").strip()
+    password = data.get("password") or ""
+
+    if not re.match(r"^[^@\s]+@[^@\s]+\.[^@\s]+$", email):
+        raise HTTPException(status_code=400, detail="valid email required")
+    if len(password) < 8:
+        raise HTTPException(status_code=400, detail="password too short (min 8)")
+    if not display_name:
+        display_name = email.split("@", 1)[0]
+
+    if db.query(User).filter(User.email == email).first():
+        raise HTTPException(status_code=409, detail="email exists")
+
+    user = User(
+        email=email,
+        password_hash=hash_password(password),
+        role=Role.admin.value,
+        display_name=display_name,
+    )
+    db.add(user)
+    db.commit()
+    db.refresh(user)
+
+    # Log the installer in immediately after successful setup.
+    set_session(resp, make_session_value(user.id))
+    return {"ok": True, "id": user.id, "email": user.email}