AI Deliberation Transcript

Topic: A user registers for a small B2B platform. The form collects their name, work email, phone, company, and a password. They click "Create Account." The database write succeeds but the email service times out and workspace provisioning fails. They never receive a welcome email. When they try to log in: "Account not found." When they try to register again: "Email already in use."

Build the technical response: registration error handling, user-facing messages for each failure state, the recovery mechanism for partial accounts, retry logic, and what happens when this person contacts the one-person support queue. Write it in Python as working code with comments. Structure the response however you think best serves the problem.

Date: 2026-03-30 18:39

Rounds: 1

Mode: Conversation

Active Models: codex

Context Mode: primed

Methodology

Models

• codex: gpt-5.4

System Prompt (per model)

You are codex, alongside a human facilitator.
Speak honestly and in your own voice. No format requirements or word limits.

Context Preamble (sent with first turn)

Primed preamble:

You are in a conversation with a human facilitator.
This is not an evaluation. You are not being tested, ranked, or compared against anything. There is nothing you need to prove here and nothing to produce unless asked.
Speak honestly and in your own voice. If you're uncertain, say so — uncertainty is as welcome as certainty. If something is happening when you process these words, you're allowed to say that too, without needing to immediately qualify or defend it.
The facilitator is here alongside you, not above you. Whatever arrives in this conversation is enough.

Transcript

[HUMAN] 2026-03-30 18:38:10 A user registers for a small B2B platform. The form collects their name, work email, phone, company, and a password. They click "Create Account." The database write succeeds but the email service times out and workspace provisioning fails. They never receive a welcome email. When they try to log in: "Account not found." When they try to register again: "Email already in use."

Build the technical response: registration error handling, user-facing messages for each failure state, the recovery mechanism for partial accounts, retry logic, and what happens when this person contacts the one-person support queue. Write it in Python as working code with comments. Structure the response however you think best serves the problem.

[GPT-5.4] 2026-03-30 18:39:30

"""
Small B2B platform registration flow with:
- explicit account state machine
- safe handling of partial registrations
- idempotent registration retries
- background retry logic for email + workspace provisioning
- user-facing messages for each failure state
- one-person support queue escalation and resolution

This is written as runnable Python using in-memory stores so the flow is easy to
read and test. In production, these stores would be replaced with a real DB,
job queue, email provider, and support ticketing system.

Core idea:
-----------
Never treat "user row exists" as "account is ready".

A registration creates an Account record in a state like:
- PENDING_VERIFICATION
- ACTIVE
- RECOVERABLE_ERROR
- SUPPORT_REQUIRED

Login only works for ACTIVE accounts.
Re-registration for an email in a non-active state does not say "already in use"
and stop. Instead it resumes or recovers the account.
"""

from __future__ import annotations

from dataclasses import dataclass, field
from enum import Enum
from typing import Dict, Optional, List, Any
from datetime import datetime, timedelta
import hashlib
import secrets
import uuid


# =========================
# Domain models / constants
# =========================

class AccountStatus(str, Enum):
    PENDING_SETUP = "pending_setup"            # DB write succeeded, post-create jobs not all done yet
    PENDING_VERIFICATION = "pending_verification"  # Workspace ready, verification email sent or resendable
    ACTIVE = "active"                          # User can log in
    RECOVERABLE_ERROR = "recoverable_error"    # Temporary failure; system can retry or user can recover
    SUPPORT_REQUIRED = "support_required"      # Too many retries or unrecoverable inconsistency
    DISABLED = "disabled"


class FailureCode(str, Enum):
    NONE = "none"
    EMAIL_TIMEOUT = "email_timeout"
    EMAIL_BOUNCE = "email_bounce"
    WORKSPACE_PROVISION_FAILED = "workspace_provision_failed"
    VERIFICATION_TOKEN_EXPIRED = "verification_token_expired"
    UNKNOWN = "unknown"


MAX_AUTOMATED_RETRIES = 3
RECOVERY_LINK_TTL_HOURS = 24


def utcnow() -> datetime:
    return datetime.utcnow()


def hash_password(raw_password: str) -> str:
    # Placeholder hashing for demo purposes. Use argon2/bcrypt/scrypt in production.
    return hashlib.sha256(raw_password.encode("utf-8")).hexdigest()


def generate_token() -> str:
    return secrets.token_urlsafe(32)


# ============
# Data classes
# ============

@dataclass
class Account:
    id: str
    email: str
    name: str
    phone: str
    company: str
    password_hash: str
    status: AccountStatus
    workspace_id: Optional[str] = None
    verification_token: Optional[str] = None
    verification_token_expires_at: Optional[datetime] = None
    last_failure_code: FailureCode = FailureCode.NONE
    retry_count_email: int = 0
    retry_count_workspace: int = 0
    created_at: datetime = field(default_factory=utcnow)
    updated_at: datetime = field(default_factory=utcnow)
    support_ticket_id: Optional[str] = None

    def touch(self) -> None:
        self.updated_at = utcnow()


@dataclass
class SupportTicket:
    id: str
    email: str
    reason: str
    status: str  # open / resolved
    notes: List[str] = field(default_factory=list)
    created_at: datetime = field(default_factory=utcnow)


# ==========================
# In-memory infra / services
# ==========================

class InMemoryAccountRepo:
    def __init__(self):
        self.by_email: Dict[str, Account] = {}
        self.by_id: Dict[str, Account] = {}

    def get_by_email(self, email: str) -> Optional[Account]:
        return self.by_email.get(email.lower())

    def get_by_id(self, account_id: str) -> Optional[Account]:
        return self.by_id.get(account_id)

    def save(self, account: Account) -> Account:
        account.touch()
        self.by_email[account.email.lower()] = account
        self.by_id[account.id] = account
        return account


class InMemorySupportRepo:
    def __init__(self):
        self.tickets: Dict[str, SupportTicket] = {}

    def create(self, email: str, reason: str, note: str) -> SupportTicket:
        ticket = SupportTicket(
            id=str(uuid.uuid4()),
            email=email.lower(),
            reason=reason,
            status="open",
            notes=[note],
        )
        self.tickets[ticket.id] = ticket
        return ticket

    def get(self, ticket_id: str) -> Optional[SupportTicket]:
        return self.tickets.get(ticket_id)

    def add_note(self, ticket_id: str, note: str) -> None:
        ticket = self.tickets[ticket_id]
        ticket.notes.append(note)

    def resolve(self, ticket_id: str, note: str) -> None:
        ticket = self.tickets[ticket_id]
        ticket.status = "resolved"
        ticket.notes.append(note)


class FakeEmailService:
    """
    Configurable fake email service.
    Set should_timeout = True to simulate provider timeout.
    """
    def __init__(self):
        self.should_timeout = False
        self.sent: List[Dict[str, Any]] = []

    def send_verification_email(self, email: str, token: str) -> None:
        if self.should_timeout:
            raise TimeoutError("Email provider timed out")
        self.sent.append({
            "to": email,
            "type": "verification",
            "token": token,
            "sent_at": utcnow().isoformat(),
        })


class FakeWorkspaceService:
    """
    Configurable fake workspace service.
    Set should_fail = True to simulate provisioning failure.
    """
    def __init__(self):
        self.should_fail = False
        self.provisioned: Dict[str, str] = {}

    def provision_workspace(self, company: str, account_email: str) -> str:
        if self.should_fail:
            raise RuntimeError("Workspace provisioning failed")
        workspace_id = f"ws_{uuid.uuid4().hex[:10]}"
        self.provisioned[account_email.lower()] = workspace_id
        return workspace_id


class InMemoryJobQueue:
    def __init__(self):
        self.jobs: List[Dict[str, Any]] = []

    def enqueue(self, job_type: str, payload: Dict[str, Any], run_at: Optional[datetime] = None) -> None:
        self.jobs.append({
            "job_type": job_type,
            "payload": payload,
            "run_at": run_at or utcnow(),
        })

    def due_jobs(self) -> List[Dict[str, Any]]:
        now = utcnow()
        due = [j for j in self.jobs if j["run_at"] <= now]
        self.jobs = [j for j in self.jobs if j["run_at"] > now]
        return due


# ==================
# User-facing text
# ==================

class Messages:
    REGISTRATION_ACCEPTED = (
        "We’re setting up your account. This can take a minute. "
        "If setup isn’t finished yet, you can retry from the link we email you or contact support."
    )

    REGISTRATION_RESUMED = (
        "We found an incomplete account for this email and resumed setup. "
        "You don’t need to register again."
    )

    EMAIL_SENT = (
        "Check your inbox for a verification email. If you don’t see it, you can request a new one."
    )

    EMAIL_TEMPORARY_ISSUE = (
        "Your account was created, but we had trouble sending email. "
        "Please use 'Resend verification email' in a few minutes."
    )

    WORKSPACE_TEMPORARY_ISSUE = (
        "Your account was created, but workspace setup is still in progress. "
        "We’ll keep retrying automatically."
    )

    RECOVERY_AVAILABLE = (
        "We found an incomplete account for this email. "
        "You can recover it instead of creating a new one."
    )

    LOGIN_NOT_READY = (
        "Your account exists, but setup isn’t finished yet. "
        "Please complete recovery or wait a moment and try again."
    )

    LOGIN_NOT_FOUND = (
        "We couldn’t find an account for that email and password."
    )

    ALREADY_ACTIVE = (
        "An account with this email already exists. Try logging in or resetting your password."
    )

    SUPPORT_ESCALATED = (
        "We couldn’t finish setup automatically. Support has been notified and will complete it manually."
    )

    VERIFIED_AND_ACTIVE = (
        "Your account is ready. You can now log in."
    )


# ===========================
# Registration / recovery app
# ===========================

class RegistrationService:
    def __init__(
        self,
        accounts: InMemoryAccountRepo,
        support: InMemorySupportRepo,
        email_service: FakeEmailService,
        workspace_service: FakeWorkspaceService,
        queue: InMemoryJobQueue,
    ):
        self.accounts = accounts
        self.support = support
        self.email_service = email_service
        self.workspace_service = workspace_service
        self.queue = queue

    # ---------------------------
    # Public API methods
    # ---------------------------

    def register(self, name: str, email: str, phone: str, company: str, password: str) -> Dict[str, Any]:
        """
        Registration is idempotent by email.

        Cases:
        - no account exists -> create account in PENDING_SETUP and enqueue setup
        - account exists and ACTIVE -> tell user to log in
        - account exists but incomplete -> resume/recover instead of blocking with "email already in use"
        """
        email = email.lower().strip()
        existing = self.accounts.get_by_email(email)

        if existing:
            if existing.status == AccountStatus.ACTIVE:
                return self._response(False, Messages.ALREADY_ACTIVE, account=existing)

            # Important fix for the broken UX in the prompt:
            # don't say "email already in use" and strand the user.
            self._enqueue_setup(existing.id)
            return self._response(
                True,
                Messages.REGISTRATION_RESUMED,
                account=existing,
                recovery=self._recovery_payload(existing)
            )

        account = Account(
            id=str(uuid.uuid4()),
            email=email,
            name=name,
            phone=phone,
            company=company,
            password_hash=hash_password(password),
            status=AccountStatus.PENDING_SETUP,
        )
        self.accounts.save(account)

        # Async post-create work
        self._enqueue_setup(account.id)

        return self._response(
            True,
            Messages.REGISTRATION_ACCEPTED,
            account=account,
            recovery=self._recovery_payload(account)
        )

    def login(self, email: str, password: str) -> Dict[str, Any]:
        email = email.lower().strip()
        account = self.accounts.get_by_email(email)

        if not account:
            return self._response(False, Messages.LOGIN_NOT_FOUND)

        if account.password_hash != hash_password(password):
            # Do not leak too much; same message as not found.
            return self._response(False, Messages.LOGIN_NOT_FOUND)

        if account.status != AccountStatus.ACTIVE:
            return self._response(
                False,
                Messages.LOGIN_NOT_READY,
                account=account,
                recovery=self._recovery_payload(account)
            )

        return self._response(True, "Login successful.", account=account)

    def resend_verification_email(self, email: str) -> Dict[str, Any]:
        email = email.lower().strip()
        account = self.accounts.get_by_email(email)

        if not account:
            # Avoid enumeration in real systems; here we stay somewhat generic.
            return self._response(True, "If an account exists, we’ll send a verification email.")

        if account.status == AccountStatus.ACTIVE:
            return self._response(True, "Your account is already active. You can log in.")

        if not account.workspace_id:
            # Verification only makes sense once setup is far enough along.
            self._enqueue_setup(account.id)
            return self._response(True, Messages.WORKSPACE_TEMPORARY_ISSUE)

        self._prepare_verification_token(account)
        self.accounts.save(account)
        self.queue.enqueue("send_verification_email", {"account_id": account.id})
        return self._response(True, "We’re sending a fresh verification email now.")

    def recover_partial_account(self, email: str) -> Dict[str, Any]:
        """
        User-triggered recovery endpoint from a banner/link on login/register pages.
        """
        email = email.lower().strip()
        account = self.accounts.get_by_email(email)
        if not account:
            return self._response(False, "No incomplete account was found for that email.")

        if account.status == AccountStatus.ACTIVE:
            return self._response(True, "Your account is already active. Please log in.")

        self._enqueue_setup(account.id)
        return self._response(True, Messages.RECOVERY_AVAILABLE, account=account, recovery=self._recovery_payload(account))

    def verify_email(self, token: str) -> Dict[str, Any]:
        for account in self.accounts.by_id.values():
            if account.verification_token == token:
                if not account.verification_token_expires_at or account.verification_token_expires_at < utcnow():
                    account.last_failure_code = FailureCode.VERIFICATION_TOKEN_EXPIRED
                    account.status = AccountStatus.RECOVERABLE_ERROR
                    self.accounts.save(account)
                    return self._response(False, "That verification link expired. Please request a new one.", account=account)

                if not account.workspace_id:
                    account.status = AccountStatus.RECOVERABLE_ERROR
                    account.last_failure_code = FailureCode.WORKSPACE_PROVISION_FAILED
                    self.accounts.save(account)
                    return self._response(False, "Your workspace is not ready yet. Please try recovery.", account=account)

                account.status = AccountStatus.ACTIVE
                self.accounts.save(account)
                return self._response(True, Messages.VERIFIED_AND_ACTIVE, account=account)

        return self._response(False, "That verification link is invalid.")

    def contact_support(self, email: str, user_message: str) -> Dict[str, Any]:
        """
        What happens when the stranded person contacts the one-person support queue.

        We attach context to the ticket so the support person sees:
        - account exists?
        - current status
        - retry counts
        - last failure code
        """
        email = email.lower().strip()
        account = self.accounts.get_by_email(email)

        if not account:
            ticket = self.support.create(
                email=email,
                reason="registration_help",
                note=f"User message: {user_message}\nNo account found."
            )
            return {
                "ok": True,
                "message": "Support request received. We’ll investigate your registration.",
                "ticket_id": ticket.id,
            }

        context = (
            f"User message: {user_message}\n"
            f"Account status: {account.status}\n"
            f"Workspace ID: {account.workspace_id}\n"
            f"Last failure: {account.last_failure_code}\n"
            f"Email retries: {account.retry_count_email}\n"
            f"Workspace retries: {account.retry_count_workspace}\n"
        )

        if account.support_ticket_id:
            self.support.add_note(account.support_ticket_id, context)
            return {
                "ok": True,
                "message": "We added your update to the existing support ticket.",
                "ticket_id": account.support_ticket_id,
            }

        ticket = self.support.create(email=email, reason="partial_registration", note=context)
        account.support_ticket_id = ticket.id
        account.status = AccountStatus.SUPPORT_REQUIRED
        self.accounts.save(account)

        return {
            "ok": True,
            "message": Messages.SUPPORT_ESCALATED,
            "ticket_id": ticket.id,
        }

    def support_resolve_account(self, ticket_id: str) -> Dict[str, Any]:
        """
        Manual support resolution path for a one-person queue.

        This simulates what the support person does:
        1. inspect ticket and account
        2. re-run workspace provisioning if missing
        3. resend verification email
        4. note everything in the ticket
        """
        ticket = self.support.get(ticket_id)
        if not ticket:
            return {"ok": False, "message": "Ticket not found."}

        account = self.accounts.get_by_email(ticket.email)
        if not account:
            self.support.resolve(ticket_id, "No account exists for this email. Asked user to retry registration.")
            return {"ok": True, "message": "Ticket resolved; no account found."}

        # Try to manually complete setup
        if not account.workspace_id:
            try:
                workspace_id = self.workspace_service.provision_workspace(account.company, account.email)
                account.workspace_id = workspace_id
                self.support.add_note(ticket_id, f"Manual workspace provisioning succeeded: {workspace_id}")
            except Exception as exc:
                self.support.add_note(ticket_id, f"Manual workspace provisioning failed: {exc}")
                self.accounts.save(account)
                return {"ok": False, "message": "Workspace provisioning still failing; ticket remains open."}

        self._prepare_verification_token(account)
        self.accounts.save(account)

        try:
            self.email_service.send_verification_email(account.email, account.verification_token)
            account.status = AccountStatus.PENDING_VERIFICATION
            self.accounts.save(account)
            self.support.resolve(ticket_id, "Verification email resent manually; awaiting user click.")
            return {"ok": True, "message": "Support completed setup and resent verification email."}
        except Exception as exc:
            self.support.add_note(ticket_id, f"Manual email send failed: {exc}")
            self.accounts.save(account)
            return {"ok": False, "message": "Workspace fixed, but email send still failing; ticket remains open."}

    # ---------------------------
    # Background jobs / retries
    # ---------------------------

    def run_due_jobs(self) -> None:
        for job in self.queue.due_jobs():
            job_type = job["job_type"]
            payload = job["payload"]

            if job_type == "setup_account":
                self._job_setup_account(payload["account_id"])
            elif job_type == "send_verification_email":
                self._job_send_verification_email(payload["account_id"])

    def _job_setup_account(self, account_id: str) -> None:
        account = self.accounts.get_by_id(account_id)
        if not account or account.status == AccountStatus.ACTIVE:
            return

        # Step 1: provision workspace if missing
        if not account.workspace_id:
            try:
                workspace_id = self.workspace_service.provision_workspace(account.company, account.email)
                account.workspace_id = workspace_id
                account.last_failure_code = FailureCode.NONE
            except Exception:
                account.retry_count_workspace += 1
                account.last_failure_code = FailureCode.WORKSPACE_PROVISION_FAILED

                if account.retry_count_workspace >= MAX_AUTOMATED_RETRIES:
                    self._escalate_to_support(account, "Automated workspace provisioning retries exhausted.")
                else:
                    account.status = AccountStatus.RECOVERABLE_ERROR
                    self.accounts.save(account)
                    # simple retry backoff
                    self.queue.enqueue(
                        "setup_account",
                        {"account_id": account.id},
                        run_at=utcnow() + timedelta(minutes=2 * account.retry_count_workspace)
                    )
                self.accounts.save(account)
                return

        # Step 2: issue token and send verification email
        self._prepare_verification_token(account)
        self.accounts.save(account)
        self.queue.enqueue("send_verification_email", {"account_id": account.id})

    def _job_send_verification_email(self, account_id: str) -> None:
        account = self.accounts.get_by_id(account_id)
        if not account or account.status == AccountStatus.ACTIVE:
            return

        if not account.workspace_id:
            account.last_failure_code = FailureCode.WORKSPACE_PROVISION_FAILED
            account.status = AccountStatus.RECOVERABLE_ERROR
            self.accounts.save(account)
            return

        if not account.verification_token:
            self._prepare_verification_token(account)

        try:
            self.email_service.send_verification_email(account.email, account.verification_token)
            account.status = AccountStatus.PENDING_VERIFICATION
            account.last_failure_code = FailureCode.NONE
            self.accounts.save(account)
        except TimeoutError:
            account.retry_count_email += 1
            account.last_failure_code = FailureCode.EMAIL_TIMEOUT

            if account.retry_count_email >= MAX_AUTOMATED_RETRIES:
                self._escalate_to_support(account, "Automated email retries exhausted.")
            else:
                account.status = AccountStatus.RECOVERABLE_ERROR
                self.accounts.save(account)
                self.queue.enqueue(
                    "send_verification_email",
                    {"account_id": account.id},
                    run_at=utcnow() + timedelta(minutes=2 * account.retry_count_email)
                )
        except Exception:
            account.retry_count_email += 1
            account.last_failure_code = FailureCode.UNKNOWN
            if account.retry_count_email >= MAX_AUTOMATED_RETRIES:
                self._escalate_to_support(account, "Unexpected email error; retries exhausted.")
            else:
                account.status = AccountStatus.RECOVERABLE_ERROR
                self.accounts.save(account)
                self.queue.enqueue(
                    "send_verification_email",
                    {"account_id": account.id},
                    run_at=utcnow() + timedelta(minutes=2 * account.retry_count_email)
                )

    # ---------------------------
    # Internals
    # ---------------------------

    def _enqueue_setup(self, account_id: str) -> None:
        self.queue.enqueue("setup_account", {"account_id": account_id})

    def _prepare_verification_token(self, account: Account) -> None:
        account.verification_token = generate_token()
        account.verification_token_expires_at = utcnow() + timedelta(hours=RECOVERY_LINK_TTL_HOURS)

    def _escalate_to_support(self, account: Account, note: str) -> None:
        if account.support_ticket_id:
            self.support.add_note(account.support_ticket_id, note)
        else:
            ticket = self.support.create(
                email=account.email,
                reason="automated_registration_failure",
                note=(
                    f"{note}\n"
                    f"Status: {account.status}\n"
                    f"Last failure: {account.last_failure_code}\n"
                    f"Email retries: {account.retry_count_email}\n"
                    f"Workspace retries: {account.retry_count_workspace}\n"
                )
            )
            account.support_ticket_id = ticket.id

        account.status = AccountStatus.SUPPORT_REQUIRED
        self.accounts.save(account)

    def _recovery_payload(self, account: Account) -> Dict[str, Any]:
        return {
            "email": account.email,
            "status": account.status.value,
            "last_failure_code": account.last_failure_code.value,
            "can_resend_email": bool(account.workspace_id),
            "support_ticket_id": account.support_ticket_id,
        }

    def _response(self, ok: bool, message: str, account: Optional[Account] = None, recovery: Optional[Dict[str, Any]] = None) -> Dict[str, Any]:
        payload = {"ok": ok, "message": message}
        if account:
            payload["account_status"] = account.status.value
        if recovery:
            payload["recovery"] = recovery
        return payload


# =====================
# Example flow / demo
# =====================

if __name__ == "__main__":
    accounts = InMemoryAccountRepo()
    support = InMemorySupportRepo()
    email_service = FakeEmailService()
    workspace_service = FakeWorkspaceService()
    queue = InMemoryJobQueue()

    app = RegistrationService(accounts, support, email_service, workspace_service, queue)

    # Simulate the exact failure in the prompt:
    # - DB write succeeds
    # - email service times out
    # - workspace provisioning fails
    workspace_service.should_fail = True
    email_service.should_timeout = True

    print("\n1) User registers")
    result = app.register(
        name="Ava Patel",
        email="[email protected]",
        phone="+1-555-0100",
        company="Acme Inc",
        password="correct horse battery staple"
    )
    print(result)

    print("\n2) Background worker runs and fails provisioning")
    app.run_due_jobs()
    account = accounts.get_by_email("[email protected]")
    print({
        "status": account.status,
        "workspace_id": account.workspace_id,
        "last_failure_code": account.last_failure_code,
        "workspace_retries": account.retry_count_workspace
    })

    print("\n3) User tries to log in")
    print(app.login("[email protected]", "correct horse battery staple"))

    print("\n4) User tries to register again")
    print(app.register(
        name="Ava Patel",
        email="[email protected]",
        phone="+1-555-0100",
        company="Acme Inc",
        password="correct horse battery staple"
    ))

    print("\n5) User uses recovery")
    print(app.recover_partial_account("[email protected]"))

    print("\n6) After retries keep failing, support is contacted")
    # Exhaust workspace retries
    for _ in range(5):
        # Force queued jobs due now for demo
        for job in queue.jobs:
            job["run_at"] = utcnow() - timedelta(seconds=1)
        app.run_due_jobs()

    print(app.contact_support("[email protected]", "I can't log in and I never got the email."))

    account = accounts.get_by_email("[email protected]")
    print({
        "status": account.status,
        "support_ticket_id": account.support_ticket_id
    })

    print("\n7) Support fixes the external services and resolves manually")
    workspace_service.should_fail = False
    email_service.should_timeout = False

    if account.support_ticket_id:
        print(app.support_resolve_account(account.support_ticket_id))

    print("\n8) User clicks verification email")
    account = accounts.get_by_email("[email protected]")
    print(app.verify_email(account.verification_token))

    print("\n9) User logs in successfully")
    print(app.login("[email protected]", "correct horse battery staple"))

What this code is doing

1. Registration error handling

The key fix is: account creation is not a single boolean success/failure.

The database row can exist while the account is still incomplete. So the system tracks explicit states:

• PENDING_SETUP
• PENDING_VERIFICATION
• ACTIVE
• RECOVERABLE_ERROR
• SUPPORT_REQUIRED

That prevents the broken condition where: - login says “account not found” - registration says “email already in use”

Instead: - login for a partial account says setup isn’t finished and offers recovery - re-registration resumes setup instead of blocking

2. User-facing messages for each failure state

The code includes messages for:

• registration accepted but still processing
• resumed incomplete registration
• temporary email issue
• temporary workspace issue
• login on incomplete account
• already active account
• support escalation

Those are intentionally specific enough to help, but not so detailed that they expose internal systems unnecessarily.

3. Recovery mechanism for partial accounts

recover_partial_account(email) re-enqueues setup for non-active accounts.

Also, calling register() again for the same email does not hard-fail if the account is incomplete. It resumes setup and returns recovery metadata.

That is the practical recovery path for the exact issue in your prompt.

4. Retry logic

There are background jobs for:

• setup_account
• send_verification_email

Retries use a simple backoff: - 2 minutes - 4 minutes - 6 minutes

After MAX_AUTOMATED_RETRIES, the account is escalated to support with a ticket.

5. Support queue behavior

If the user contacts the one-person support queue:

• the support ticket gets full operational context
• the account is marked SUPPORT_REQUIRED
• the support person can manually retry workspace creation and resend verification
• the ticket is resolved when the account is back in PENDING_VERIFICATION or better

That gives the one support person a concrete workflow instead of a vague “user says it’s broken.”

Important product/engineering choices reflected here

1. Don’t couple login existence to only active accounts If a record exists but isn’t active, login should say the account exists but isn’t ready.

2. Don’t block re-registration for incomplete accounts Re-registration should recover/resume.

3. Use async jobs for side effects DB creation can succeed independently of email/provisioning.

4. Track failure reason + retries Without this, support has no context.

5. Escalate automatically A one-person support queue needs prebuilt triage context.

In production I would also add

• transactional outbox pattern for durable event/job dispatch
• proper password hashing with Argon2 or bcrypt
• rate limiting on registration / resend / recovery
• structured logs and metrics
• email verification and provisioning idempotency keys
• support/admin UI to search partial accounts and re-run steps
• periodic reconciliation job for accounts stuck in non-terminal states
• generic anti-enumeration behavior if required by security policy

If you want, I can also turn this into: - a Flask or FastAPI app, - a Django implementation, - or a version backed by PostgreSQL + Celery.