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ARQUITECTURE.md – MC Cars stack

A thorough walkthrough of how the MC Cars system is wired. Complements AGENT.md (operational notes) and README.md (how to run).

1. High-level diagram

                         Browser (<host>)
                   │                │
       :55580 (nginx)        :55521 (Kong)          :55530 (Studio)
             │                      │                         │
      ┌──────┴──────┐                │                         │
      │   web       │                │                         │
      │  (static)   │                │                         │
      └─────────────┘                │                         │
                                     │                         │
           ┌─────────────────────────┼─────────────────────────┤
           │            │            │             │           │
        /auth/v1    /rest/v1    /realtime/v1    /storage/v1   /pg/
           │            │            │             │           │
      ┌────┴───┐  ┌─────┴────┐  ┌────┴────┐  ┌─────┴────┐ ┌────┴───┐
      │ gotrue │  │ postgrest│  │ realtime│  │ storage  │ │  meta  │
      └────┬───┘  └─────┬────┘  └────┬────┘  └─────┬────┘ └────┬───┘
           │            │            │             │           │
           └──────────┬─┴────────────┴─────────────┴───────────┘
                      │
                 ┌────┴─────┐       ┌───────────┐
                 │ postgres │       │ imgproxy  │
                 │ (wal:    │       │  (resize) │
                 │ logical) │       └───────────┘
                 └──────────┘              ▲
                      │                    │
          /mnt/.../data/db      /mnt/.../data/storage

Dashed lifetime services (exit 0 once done): post-init.

Network: single user-defined bridge mccars. No host networking, no ingress controller — everything is container-to-container DNS (db, auth, kong, …).

2. Request flows

2.1 Public visitor reads cars

browser → :55580/index.html            (nginx, static)
browser → :55521/rest/v1/vehicles?select=*&is_active=eq.true
        → Kong → rest (PostgREST) → postgres
        → RLS: "vehicles_select_active" (for anon, is_active=true only)
        ← JSON

No auth header except the anon apikey. Kong strips the key and forwards with the service's internal Auth context.

2.2 Public visitor submits booking

browser → supabase.rpc('create_lead', {p_name, p_email, p_phone, p_vehicle_id,
             p_vehicle_label, p_date_from, p_date_to, p_message, p_source,
             p_ip_address, p_ip_country})
        → :55521/rest/v1/rpc/create_lead  (POST, apikey=anon)
        → PostgREST → postgres.public.create_lead(...)
        → internally calls calculate_price() → computes pricing
        → INSERT INTO leads (with pricing columns)
        ← lead uuid

No price parameters are accepted from the client — all pricing is computed server-side. This prevents price-tampering. The frontend never reads leads back. If the RPC fails (validation, RLS), the UI shows a localized failure string.

2.3 Admin login

browser(admin.html) → supabase.auth.signInWithPassword
        → :55521/auth/v1/token?grant_type=password
        → Kong → gotrue → postgres(auth.users)
        ← access_token (JWT, aud=authenticated), refresh_token
        ← user.raw_user_meta_data.must_change_password (true on bootstrap)

if must_change_password:
    user blocked in "Passwort setzen" screen
    supabase.auth.updateUser({password, data:{must_change_password:false}})
        → :55521/auth/v1/user  (PUT with Bearer access_token)
        → gotrue updates auth.users

2.4 Admin qualifies a lead

admin.js → supabase.rpc('qualify_lead', {p_lead_id, p_notes})
        → PostgREST → postgres.public.qualify_lead(uuid,text)
        (SECURITY INVOKER, role=authenticated, auth.uid()=admin)
        BEGIN
          SELECT ... FOR UPDATE on leads
          UPDATE leads SET status='qualified', is_active=false, ...
          INSERT INTO customers (lead_id, name, email, phone, ...)
        COMMIT
        ← customers row

Realtime publication fires:
  postgres_changes(table=leads,     event=UPDATE, ...) → admin.js channel
  postgres_changes(table=customers, event=INSERT, ...) → admin.js channel
        → admin UI reloads tabs, badges update

2.5 Photo upload

admin.js → supabase.storage.from('vehicle-photos').upload(path, file)
        → :55521/storage/v1/object/vehicle-photos/<path>
        → Kong → storage-api → /mnt/.../data/storage
        ← public URL served via imgproxy for on-the-fly transforms
admin.js → UPDATE vehicles SET photo_url = <public url>

Bucket is public-read, write-authenticated, MIME-restricted to image/*, 50 MB cap.

2.6 Server-side price calculation

app.js → supabase.rpc('calculate_price', {p_vehicle_id, p_date_from, p_date_to})
       → :55521/rest/v1/rpc/calculate_price  (POST, apikey=anon)
       → PostgREST → postgres.public.calculate_price(uuid, date, date)
       ← jsonb {daily_subtotal, weekend_subtotal, subtotal_eur, vat_eur, total_eur,
                deposit_eur, total_days, weekday_count, weekend_day_count}

Pricing logic lives only in the database — the frontend never computes prices. create_lead also calls calculate_price internally to store an immutable pricing snapshot on the lead row.

2.7 Lead submission (server-computed prices)

app.js → supabase.rpc('create_lead', {p_name, p_email, p_phone, p_vehicle_id,
             p_vehicle_label, p_date_from, p_date_to, p_message, p_source,
             p_ip_address, p_ip_country})
       → PostgREST → postgres.public.create_lead(...)
       → internally calls calculate_price → stores pricing on lead row
       ← lead uuid

No price parameters are accepted from the client. This prevents price-tampering attacks.

2.8 Site settings & configurable hero image

app.js → supabase.from('site_settings').select('value').eq('key','hero_image_url').single()
       → :55521/rest/v1/site_settings?key=eq.hero_image_url&select=value
       → RLS: anon SELECT allowed
       ← { value: '/images/ferrari-main-car.png' }
       → app.js sets CSS variable --hero-bg on .hero element

Admin upload flow:

admin.js → supabase.storage.from('vehicle-photos').upload('site/hero.ext', file, {upsert:true})
         → storage API writes to bucket
         ← public URL
admin.js → supabase.from('site_settings').upsert({key:'hero_image_url', value: publicUrl})
         → PostgREST → UPDATE site_settings
         ← 200

The CSS uses var(--hero-bg, url('images/ferrari-main-car.png')) so the default hero image is shown until JavaScript loads and overrides it.

3. Database layout

postgres (database = "postgres")
├── auth schema           (GoTrue)
├── storage schema        (Storage API)
├── _realtime schema      (Realtime bookkeeping)
└── public schema
    ├── vehicles              (fleet)
    ├── leads                 (form submissions, server-computed pricing)
    ├── lead_attachments      (id_document, income_proof per lead)
    ├── customers             (spawned from qualified leads)
    ├── customer_attachments  (admin-uploaded docs for customers)
    ├── sales_orders          (rental orders linked to customer+lead)
    ├── sales_order_attachments
    ├── site_settings         (key-value config, e.g. hero_image_url)
    ├── tg_touch_updated_at()       trigger fn
    ├── calculate_price()           RPC (public, read-only pricing)
    ├── create_lead()               RPC (server-side price computation)
    ├── qualify_lead()              RPC
    ├── disqualify_lead()           RPC
    ├── reopen_lead()               RPC
    ├── sales_order_toggle_kaution()   RPC
    ├── sales_order_toggle_rental()    RPC
    ├── sales_order_toggle_complete()  RPC
    ├── customer_update_private_notes() RPC
    ├── sales_order_update_private_notes() RPC
    └── sales_order_upload_attachment()    RPC

3.1 public.vehicles

  • id uuid pk
  • brand, model, power_hp, top_speed_kmh, acceleration, seats, daily_price_eur
  • sort_order, location
  • description_de, description_en
  • photo_url, photo_path (storage object key for deletion)
  • is_active bool — public visibility flag
  • created_at, updated_at

3.2 public.leads

  • id uuid pk
  • name, email, phone
  • vehicle_id → vehicles(id) ON DELETE SET NULL
  • vehicle_label text — denormalized at submit; survives vehicle deletion
  • date_from, date_to, message
  • Pricing (server-computed, immutable): daily_subtotal, weekend_subtotal, subtotal_eur, vat_eur, total_eur, deposit_eur, total_days, weekday_count, weekend_day_count
  • status check in ('new','qualified','disqualified') default new
  • is_active bool default true — filter for Active/Inactive tabs
  • admin_notes text
  • source text default 'website'
  • ip_address inet, ip_country text — geolocation info from submission
  • qualified_at, qualified_by → auth.users(id)

3.3 public.customers

  • id uuid pk
  • lead_id → leads(id) ON DELETE RESTRICT + unique index (exactly one customer per lead)
  • name, email, phone
  • first_contacted_at
  • notes, private_notes
  • status check in ('active','inactive')
  • created_by → auth.users(id)

3.4 public.lead_attachments

  • id uuid pk
  • lead_id → leads(id) ON DELETE CASCADE
  • bucket, file_path, file_name, mime_type
  • kind check in ('id_document', 'income_proof', 'other')
  • Unique partial index: max 1 id_document + 1 income_proof per lead

3.5 public.sales_orders

  • id uuid pk
  • customer_id → customers(id), lead_id → leads(id)
  • order_number, private_notes
  • kaution_paid, rental_paid, rental_complete (booleans + timestamps)
  • Pricing snapshot: daily_subtotal, weekend_subtotal, subtotal_eur, vat_eur, total_eur, deposit_eur
  • total_days, weekday_count, weekend_day_count, date_from, date_to, vehicle_label

3.6 public.site_settings

  • key text pk — setting identifier (e.g. hero_image_url)
  • value text — setting value (e.g. a public URL or path)
  • updated_at timestamptz
  • RLS: public SELECT for all, authenticated-only INSERT/UPDATE/DELETE

3.7 RLS matrix

Table anon authenticated
vehicles SELECT where is_active=true full CRUD
leads INSERT only full CRUD
lead_attachments INSERT only SELECT + INSERT
customers denied full CRUD
sales_orders denied full CRUD
site_settings SELECT only full CRUD

3.8 Storage buckets

Bucket Public read anon writes authenticated writes Notes
vehicle-photos yes no INSERT (MIME image/*, 50 MB) Fleet photos + site hero image
customer-documents no INSERT only SELECT + INSERT ID docs, income proofs

Anon users may only INSERT into customer-documents (no SELECT/UPDATE/DELETE). Admin can SELECT + INSERT but not DELETE (prevents accidental evidence destruction).

3.9 RPCs

Function Role required Semantics
calculate_price(uuid, date, date) anon Read-only pricing calculator. Returns jsonb: {daily_subtotal, weekend_subtotal, subtotal_eur, vat_eur, total_eur, deposit_eur, total_days, weekday_count, weekend_day_count}. Uses vehicle's daily_price_eur, applies 20% weekend surcharge, 19% VAT, 3× daily deposit.
create_lead(...) anon Creates a lead with server-computed pricing (calls calculate_price internally). Accepts: name, email, phone, vehicle_id, vehicle_label, date_from, date_to, message, source, ip_address, ip_country. No price params from client.
qualify_lead(uuid, text) authenticated Locks lead row, flips to qualified+inactive, inserts matching customer + sales_order with pricing snapshot. Idempotent: returns existing customer on second call.
disqualify_lead(uuid, text) authenticated Marks lead disqualified+inactive, stores notes.
reopen_lead(uuid) authenticated Resets lead to new+active, deletes the spawned customer if any.
sales_order_toggle_kaution(uuid) authenticated Toggles kaution_paid boolean + timestamp on a sales order.
sales_order_toggle_rental(uuid) authenticated Toggles rental_paid boolean + timestamp.
sales_order_toggle_complete(uuid) authenticated Toggles rental_complete boolean + timestamp.
customer_update_private_notes(uuid, text) authenticated Updates private_notes field on a customer.
sales_order_update_private_notes(uuid, text) authenticated Updates private_notes field on a sales order.

All three are SECURITY INVOKER, so auth.uid() is the live admin and RLS applies.

4. Realtime

  • Postgres runs with wal_level=logical, max_wal_senders=10, max_replication_slots=10.
  • supabase/realtime:v2.30.23 on internal :4000, DB_USER=postgres (no supabase_admin on plain postgres).
  • Publication supabase_realtime dynamically adds leads, customers, vehicles.
  • replica identity full on all three — delivers the full row on updates (needed so the admin UI can show changed fields without re-fetching).
  • Frontend joins a single channel (mccars-admin) and attaches three postgres_changes handlers.

5. API gateway (Kong)

Declarative config in supabase/kong.yml. One consumer per role:

Consumer apikey ACL groups Routes accessible
anon ANON_KEY anon /auth/v1/*, /rest/v1/* (rls-gated), /realtime/v1/*, /storage/v1/object/public/*
service_role SERVICE_ROLE_KEY admin all of the above + /pg/* (postgres-meta), write paths

Plugins pipeline: cors → key-auth → acl → proxy. Public routes (storage public objects) are whitelisted without key-auth.

Host port mapping: 55521:8000 (8000 blocked by Docker Desktop's wslrelay on Windows; 555xx range avoids collisions on busy Docker hosts).

6. Frontend architecture

frontend/
├── nginx.conf              (serves /, gzip, cache headers)
├── index.html  app.js      (public site, anon key, persistSession:false)
├── admin.html  admin.js    (admin CRM + settings, persistSession:true)
├── i18n.js                 (DE/EN)
├── styles.css              (copper/charcoal palette, CSS-variable hero image)
├── impressum.html
└── datenschutz.html
  • config.js is generated at container start by an inline entrypoint: command in docker-compose.yml. It writes window.MCCARS_CONFIG={SUPABASE_URL,SUPABASE_ANON_KEY} from the container's environment variables. No separate script file is used — Unraid's filesystem does not preserve Unix execute bits on bind mounts, so a mounted .sh file would be silently ignored.
  • config.js is git-ignored. The repo never ships a file with hardcoded URLs.
  • Both index.html and admin.html load config.js with ?v=<timestamp> appended via an inline document.write snippet, ensuring proxies and browsers never cache a stale URL.
  • The web service uses nginx:1.27-alpine directly with bind-mounted files (no build: step). This is Portainer-compatible: updating the frontend is git pull + docker compose up -d --force-recreate web.
  • admin.js is ES modules, imports @supabase/supabase-js from esm.sh (CDN, pinned version). One Supabase client per page.
  • State lives in a single state object. Admin re-renders the active tab on realtime events.
  • Admin tabs: Aktive Leads, Inaktive Leads, Kunden, Fahrzeuge, Einstellungen (site settings: hero image upload).
  • Force-password-change modal is the only state that can preempt the rest of the admin UI after login.
  • Public site hero image is loaded dynamically from site_settings table at boot and applied via CSS variable --hero-bg. Fallback default is baked into styles.css.

7. Deployment

Host root: /mnt/user/appdata/mc-cars

All bind mounts in docker-compose.yml use absolute paths under that root. The compose has no build: steps — every image is pulled from a registry, making it Portainer-compatible.

What's state (under /mnt/user/appdata/mc-cars/data/):

  • data/db/ — Postgres cluster
  • data/storage/ — object bucket files

What's code/config (committed):

  • docker-compose.yml, .env, supabase/, frontend/, AGENT.md, ARQUITECTURE.md, README.md, .gitattributes

Portainer deployment:

  1. Clone repo to /mnt/user/appdata/mc-cars
  2. mkdir -p data/{db,storage}
  3. Edit .env: set SITE_URL and SUPABASE_PUBLIC_URL to your domain (see below)
  4. Portainer → Stacks → Add stack → paste compose + env vars → Deploy

No chmod needed. The entrypoint that writes config.js is an inline shell command in docker-compose.yml, not a bind-mounted script, so file permissions are irrelevant.

Environment: two variables to change per environment

Variable Local dev Production (NAS)
SITE_URL http://localhost:55580 https://your.domain.com
SUPABASE_PUBLIC_URL http://localhost:55521 https://your.domain.com

All other GoTrue vars (API_EXTERNAL_URL, GOTRUE_SITE_URL, GOTRUE_URI_ALLOW_LIST) are derived from these two in docker-compose.yml.

Nginx Proxy Manager (NPM) — required settings for single-domain HTTPS:

Create one proxy host for your domain (e.g. demo.lago.dev):

Details tab:

  • Scheme: http
  • Forward Hostname / IP: <NAS IP> (e.g. 192.168.178.3)
  • Forward Port: 55580
  • Cache Assets: OFF (if left ON, NPM caches config.js and serves stale URLs)
  • Websockets Support: ON (required for Realtime)
  • Block Common Exploits: ON

SSL tab:

  • SSL Certificate: your domain cert
  • Force SSL: ON
  • HTTP/2 Support: ON

Advanced tab (⚙️) — paste this exactly:

location /auth/v1/ {
    proxy_pass http://192.168.178.3:55521;
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header X-Forwarded-Proto $scheme;
}

location /rest/v1/ {
    proxy_pass http://192.168.178.3:55521;
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header X-Forwarded-Proto $scheme;
}

location /realtime/v1/ {
    proxy_pass http://192.168.178.3:55521;
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header X-Forwarded-Proto $scheme;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";
}

location /storage/v1/ {
    proxy_pass http://192.168.178.3:55521;
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header X-Forwarded-Proto $scheme;
}

This routes https://your.domain.com/ → nginx (static site) and all API paths → Kong. Do not expose /pg/ or Studio publicly.

For real deployments:

  1. Generate a new JWT_SECRET and matching ANON_KEY / SERVICE_ROLE_KEY (see Supabase self-hosting docs).
  2. Set a strong POSTGRES_PASSWORD, ADMIN_PASSWORD.
  3. Wire real SMTP for password-reset mail (SMTP_*).
  4. Back up /mnt/user/appdata/mc-cars/data/ on a schedule.

8. Security model summary

  • No admin keys in the browser, ever. Only the anon key reaches the client.
  • Signup is disabled (GOTRUE_DISABLE_SIGNUP=true). New admins are provisioned by inserting into auth.users via post-boot.sql or Studio.
  • Bootstrap password is forced out on first login (must_change_password metadata). Frontend refuses to reuse the bootstrap value.
  • RLS is the single source of authorization. The admin UI calling .from('leads').select('*') works only because the authenticated policy allows it; without a valid Bearer JWT the same query returns zero rows.
  • RPCs are SECURITY INVOKER — no role-escalation surface.
  • Server-side pricing — create_lead computes prices internally via calculate_price. No price parameters are accepted from the client, preventing price-tampering.
  • Document security — customer-documents bucket allows anon INSERT only (upload), no SELECT/DELETE. Admin can SELECT + INSERT but not DELETE. Unique partial indexes enforce max 1 id_document + 1 income_proof per lead.
  • Storage bucket (vehicle-photos) is public-read (photos must render on the public site) but writes need authenticated, MIME-restricted, size-limited.
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