morz-infoboard/docs/SCHEMA.md

Info-Board Neu - Schema-Entwurf

Ziel

Dieses Dokument bringt das fachliche Datenmodell in eine konkrete, relationale Form.

Es ist noch kein finales Migrationsskript, aber bereits so strukturiert, dass daraus spaeter direkt PostgreSQL-Tabellen und Migrationen abgeleitet werden koennen.

Grundannahmen

• Ziel-Datenbank: PostgreSQL
• IDs als UUID oder technisch gleichwertige stabile Primärschluessel
• Zeitstempel in UTC
• Status- und Typwerte zunaechst als textuelle Enum-Werte oder PostgreSQL-Enums

Konventionen

• Primärschluessel: id
• Fremdschluessel: <bezug>_id
• Zeitstempel: created_at, updated_at
• nullable Felder nur dort, wo fachlich wirklich noetig

Zentrale Tabellen

tenants

Zweck:

• abgeschottete Firmen- oder Inhaltsbereiche

Spalten:

id uuid primary key
slug text not null unique
name text not null
active boolean not null default true
created_at timestamptz not null
updated_at timestamptz not null

users

Zweck:

• Admin- und Tenant-Benutzer

Spalten:

id uuid primary key
tenant_id uuid null references tenants(id) on delete set null
username text not null unique
email text not null unique
password_hash text not null
role text not null
active boolean not null default true
last_login_at timestamptz null
created_at timestamptz not null
updated_at timestamptz not null

Regeln:

• role in v1: admin, tenant_user

screen_groups

Zweck:

• logische Gruppen wie wall-all oder vertretungsplan-all

Spalten:

id uuid primary key
slug text not null unique
name text not null
description text null
created_at timestamptz not null
updated_at timestamptz not null

screens

Zweck:

• physische Displays bzw. Player-Geraete

Spalten:

id uuid primary key
tenant_id uuid null references tenants(id) on delete set null
slug text not null unique
name text not null
description text null
location text null
hardware_name text null
screen_class text not null
enabled boolean not null default true
orientation text not null
rotation integer not null default 0
resolution_width integer null
resolution_height integer null
fallback_dir text not null
snapshot_interval_seconds integer not null default 60
offline_overlay_enabled boolean not null default true
created_at timestamptz not null
updated_at timestamptz not null

Regeln:

• orientation in v1: portrait, landscape
• rotation in v1: 0, 90, 180, 270
• screen_class in v1 z. B. info_wall_display, single_info_display, vertretungsplan_display

screen_group_members

Zweck:

• Zuordnung von Screens zu Gruppen

Spalten:

id uuid primary key
screen_group_id uuid not null references screen_groups(id) on delete cascade
screen_id uuid not null references screens(id) on delete cascade
created_at timestamptz not null

Unique:

unique (screen_group_id, screen_id)

screen_registrations

Zweck:

• technische Registrierung und Wiedererkennung eines Geraets

Spalten:

id uuid primary key
screen_id uuid not null unique references screens(id) on delete cascade
device_uuid text not null unique
hostname text null
api_token_hash text not null
mqtt_client_id text not null unique
last_seen_at timestamptz null
last_ip inet null
player_version text null
os_version text null
created_at timestamptz not null
updated_at timestamptz not null

provisioning_jobs

Zweck:

• technische Erstinstallation und Re-Provisionierung von Screens

Spalten:

id uuid primary key
screen_id uuid not null references screens(id) on delete cascade
requested_by_user_id uuid not null references users(id) on delete restrict
target_ip inet not null
target_port integer not null default 22
remote_user text not null default 'root'
auth_mode text not null
provided_secret_ref text null
ssh_key_fingerprint text null
status text not null
stage text not null
log_excerpt text null
error_message text null
started_at timestamptz null
finished_at timestamptz null
created_at timestamptz not null
updated_at timestamptz not null

Regeln:

• Passwort nicht direkt in dieser Tabelle speichern
• status in v1: queued, running, succeeded, failed, cancelled

media_assets

Zweck:

• verwaltete Medien und Web-Referenzen

Spalten:

id uuid primary key
tenant_id uuid not null references tenants(id) on delete cascade
screen_id uuid null references screens(id) on delete set null
title text not null
description text null
type text not null
source_kind text not null
storage_path text null
original_url text null
mime_type text null
checksum text null
size_bytes bigint null
enabled boolean not null default true
created_by_user_id uuid not null references users(id) on delete restrict
created_at timestamptz not null
updated_at timestamptz not null

Regeln:

• type in v1: image, video, pdf, web
• source_kind in v1: upload, remote_url

playlists

Zweck:

• tenantbezogene Hauptplaylist eines Screens

Spalten:

id uuid primary key
tenant_id uuid not null references tenants(id) on delete cascade
screen_id uuid not null references screens(id) on delete cascade
name text not null
is_active boolean not null default true
default_duration_seconds integer not null default 20
fallback_enabled boolean not null default true
fallback_dir text not null
shuffle_enabled boolean not null default false
created_at timestamptz not null
updated_at timestamptz not null

Unique:

unique (screen_id, is_active) where is_active = true

playlist_items

Zweck:

• Elemente einer tenantbezogenen Playlist

Spalten:

id uuid primary key
playlist_id uuid not null references playlists(id) on delete cascade
media_asset_id uuid null references media_assets(id) on delete set null
order_index integer not null
type text not null
src text not null
title text null
duration_seconds integer not null
load_timeout_seconds integer not null default 15
cache_policy text not null default 'prefer_cache'
on_error text not null default 'skip'
retry_count integer not null default 0
valid_from timestamptz null
valid_until timestamptz null
enabled boolean not null default true
created_at timestamptz not null
updated_at timestamptz not null

playlist_item_dir_rules

Zweck:

• Zusatzregeln fuer dir-Items

Spalten:

id uuid primary key
playlist_item_id uuid not null unique references playlist_items(id) on delete cascade
directory_path text not null
sort_mode text not null default 'name_asc'
per_item_duration_seconds integer not null default 20
recursive boolean not null default false
file_filter text null

Kampagnen- und Template-Tabellen

display_templates

Zweck:

• globale Templates fuer adminseitige Uebersteuerungen

Spalten:

id uuid primary key
slug text not null unique
name text not null
description text null
template_type text not null
enabled boolean not null default true
created_by_user_id uuid not null references users(id) on delete restrict
created_at timestamptz not null
updated_at timestamptz not null

template_scenes

Zweck:

• konkrete Szenen eines Templates fuer Screens, Gruppen oder Slots

Spalten:

id uuid primary key
display_template_id uuid not null references display_templates(id) on delete cascade
screen_id uuid null references screens(id) on delete cascade
screen_group_id uuid null references screen_groups(id) on delete cascade
screen_slot text null
orientation text null
type text not null
src text not null
duration_seconds integer not null default 20
load_timeout_seconds integer not null default 15
cache_policy text not null default 'prefer_cache'
on_error text not null default 'skip'
layout_json jsonb not null default '{}'::jsonb
created_at timestamptz not null
updated_at timestamptz not null

Hinweis:

• orientation erlaubt z. B. getrennte Portrait-/Landscape-Szenen innerhalb einer Kampagne

campaigns

Zweck:

• aktivierbare Instanzen globaler Templates

Spalten:

id uuid primary key
display_template_id uuid not null references display_templates(id) on delete cascade
name text not null
description text null
priority integer not null default 100
active boolean not null default false
valid_from timestamptz null
valid_until timestamptz null
override_mode text not null default 'replace_tenant_content'
created_by_user_id uuid not null references users(id) on delete restrict
created_at timestamptz not null
updated_at timestamptz not null

template_assignments

Zweck:

• explizite Zielzuordnung einer Kampagne
• Gruppen werden in v1 serverseitig in konkrete Screen-Zuordnungen expandiert

Spalten:

id uuid primary key
campaign_id uuid not null references campaigns(id) on delete cascade
screen_id uuid not null references screens(id) on delete cascade
enabled boolean not null default true
created_at timestamptz not null
updated_at timestamptz not null

Unique:

unique (campaign_id, screen_id)

Laufzeit- und Betriebsdaten

screen_status

Zweck:

• aktueller verdichteter Laufzeitstatus pro Screen

Spalten:

screen_id uuid primary key references screens(id) on delete cascade
online boolean not null default false
server_connected boolean not null default false
mqtt_connected boolean not null default false
last_heartbeat_at timestamptz null
last_sync_at timestamptz null
current_playlist_id uuid null references playlists(id) on delete set null
current_playlist_item_id uuid null references playlist_items(id) on delete set null
current_content_source text null
current_campaign_id uuid null references campaigns(id) on delete set null
current_item_type text null
current_item_label text null
current_item_started_at timestamptz null
current_item_duration_seconds integer null
cache_state text not null default 'ok'
overlay_state text not null default 'online'
error_code text null
error_message text null
player_version text null
uptime_seconds bigint null
free_disk_bytes bigint null
temperature_celsius numeric(5,2) null
updated_at timestamptz not null

screen_snapshots

Zweck:

• Screenshots fuer Vorschau und Diagnose

Spalten:

id uuid primary key
screen_id uuid not null references screens(id) on delete cascade
captured_at timestamptz not null
storage_path text not null
width integer null
height integer null
mime_type text not null
source text not null

device_commands

Zweck:

• nachvollziehbare Fernsteuerbefehle an Screens

Spalten:

id uuid primary key
screen_id uuid not null references screens(id) on delete cascade
command_type text not null
payload_json jsonb not null default '{}'::jsonb
requested_by_user_id uuid not null references users(id) on delete restrict
requested_at timestamptz not null
delivery_state text not null
delivered_at timestamptz null
acknowledged_at timestamptz null
result_code text null
result_message text null

sync_state

Zweck:

• letzter bekannter Synchronisationsstand pro Screen

Spalten:

screen_id uuid primary key references screens(id) on delete cascade
config_revision bigint not null default 0
playlist_revision bigint not null default 0
media_revision bigint not null default 0
campaign_revision bigint not null default 0
last_successful_sync_at timestamptz null
last_failed_sync_at timestamptz null
last_error_message text null

Wichtige Indizes

Empfohlen mindestens:

create index idx_screens_tenant_id on screens(tenant_id);
create index idx_media_assets_tenant_id on media_assets(tenant_id);
create index idx_playlists_screen_id on playlists(screen_id);
create index idx_playlist_items_playlist_id_order on playlist_items(playlist_id, order_index);
create index idx_campaigns_active_validity on campaigns(active, valid_from, valid_until);
create index idx_template_assignments_screen_id on template_assignments(screen_id);
create index idx_provisioning_jobs_screen_id on provisioning_jobs(screen_id);
create index idx_provisioning_jobs_status on provisioning_jobs(status);
create index idx_screen_snapshots_screen_id_captured_at on screen_snapshots(screen_id, captured_at desc);
create index idx_device_commands_screen_id_requested_at on device_commands(screen_id, requested_at desc);

Prioritaetslogik in relationaler Form

Ein Screen zeigt in dieser Reihenfolge:

1. aktive Kampagne mit passender Assignment-Zuordnung
2. aktive tenantbezogene Playlist-Eintraege
3. Fallback-Verzeichnis

Eine Kampagne ist aktiv, wenn:

• campaigns.active = true
• valid_from is null or valid_from <= now()
• valid_until is null or valid_until > now()
• template_assignments.enabled = true

Ein Playlist-Item ist aktiv, wenn:

• enabled = true
• valid_from is null or valid_from <= now()
• valid_until is null or valid_until > now()

Offene spaetere Erweiterungen

• Historientabellen fuer Heartbeats und Status als Zeitreihe
• Versionierung von Playlists und Templates
• Medienkonvertierung oder serverseitige Derivate
• mehrere aktive Kampagnen mit Kollisionsregeln
• Slot-Topologien fuer unterschiedlich grosse Wandsysteme

Verbindliche Architekturentscheidungen fuer v1

• playlist_items enthalten keinen direkten screen_id-Fremdschluessel
• Kampagnengruppen werden serverseitig in template_assignments auf konkrete Screens expandiert
• message_wall wird nicht im Player segmentiert, sondern serverseitig aufbereitet