pulse-signage/docs/schema.md

Database Schema

This app creates and maintains its schema at startup through src/db/index.js. The sections below summarize the current tables and their purpose.

Tables generally use a numeric auto-increment id primary key. The relationship table d_announcement_screens intentionally uses the composite (announcement_id, screen_id) primary key instead. Natural and relationship keys remain as unique constraints where needed. Timestamps are stored as created_at and modified_at when a table supports auditing.

Admin

• a_users - admin user accounts and password hashes.
• a_roles - named role definitions.
• a_permissions - permission catalog seeded from the application constants.
• a_role_permissions - many-to-many mapping between roles and permissions.
• a_user_roles - many-to-many mapping between users and roles.
• a_sessions - persisted admin session tokens.

a_users

• id, name, username, password_hash, password_salt, password_iterations, must_change_password, account_locked, created_at, created_by, modified_at, modified_by
• username is unique.

a_roles

• id, role_key, name, description, created_at, created_by, modified_at, modified_by
• role_key is unique.
• name is unique.

a_permissions

• id, permission_key, name, section_name, description, created_at, modified_at
• permission_key is unique.

a_role_permissions

• id, role_id, permission_id, created_at, modified_at
• Foreign keys: - role_id -> a_roles.id - permission_id -> a_permissions.id
• Unique key: (role_id, permission_id)

a_user_roles

• id, user_id, role_id, created_at, modified_at
• Foreign keys: - user_id -> a_users.id - role_id -> a_roles.id
• Unique key: (user_id, role_id)

a_sessions

• id, session_hash, user_id, ip_address, user_agent, expires_at, created_at, created_by, last_used_at, modified_by
• session_hash is unique.
• Foreign key: - user_id -> a_users.id

Content

• c_canvas_sizes - reusable canvas presets for templates.
• c_playlists - playlist definitions, playback options, and canvas assignment.
• c_templates - slide templates with canvas and background settings.
• c_template_regions - template region layout and metadata.
• c_slides - slide records with template binding, JSON content, and thumbnail path.
• c_playlist_slides - ordered playlist items and timing.
• c_playlist_slide_schedule_rules - rule rows attached to playlist slides.

c_canvas_sizes

• id, name, width, height, created_at, created_by, modified_at, modified_by
• (width, height) is unique.

c_playlists

• id, name, fade_between_slides, skip_unavailable_rtmp, canvas_id, created_at, created_by, modified_at, modified_by
• Foreign key: - canvas_id -> c_canvas_sizes.id with ON DELETE SET NULL

c_templates

• id, name, canvas_size_id, background_image_path, background_color, background_gradient, created_at, created_by, modified_at, modified_by
• background_gradient stores normalized linear gradient settings as JSON text, including angle and colour stops.
• Foreign key: - canvas_size_id -> c_canvas_sizes.id with ON DELETE SET NULL

c_template_regions

• id, template_id, region_key, region_type, label, font_family, lock_ratio, animation_json, x, y, width, height, z_index, created_at, created_by, modified_at, modified_by
• Foreign key: - template_id -> c_templates.id with ON DELETE CASCADE

c_slides

• id, title, template_id, content_json, thumbnail_path, created_at, created_by, modified_at, modified_by
• Foreign key: - template_id -> c_templates.id with ON DELETE SET NULL

c_playlist_slides

• id, playlist_id, slide_id, position, duration_seconds, use_video_duration, disable_audio, created_at, created_by, modified_at, modified_by
• Foreign keys: - playlist_id -> c_playlists.id with ON DELETE CASCADE - slide_id -> c_slides.id with ON DELETE CASCADE

c_playlist_slide_schedule_rules

• id, playlist_slide_id, position, start_datetime, end_datetime, start_time, end_time, schedule_days_json, created_at, created_by, modified_at, modified_by

• Foreign key: - playlist_slide_id -> c_playlist_slides.id with ON DELETE CASCADE

• Index: - (playlist_slide_id, position)

• Each playlist slide can have zero or more schedule rules.

• Rules are evaluated with OR across rows and with AND across the fields inside a single rule.

Devices

• d_players - player registry and connection metadata.
• d_screens - screen records and playlist assignment.
• d_onboarding_devices - device-to-screen bindings and onboarded client names.

d_players

• id, identifier, public_base_url, internal_base_url, last_seen_at, created_at, modified_at
• id is the primary key.
• identifier is unique and is the stable player identity used by the app.

d_screens

• id, name, slug, playlist_id, created_at, created_by, modified_at, modified_by

• slug is unique.

• Foreign keys: - playlist_id -> c_playlists.id with ON DELETE SET NULL

• Screens are no longer tied to a player foreign key directly; player registration and live connection metadata are tracked separately in d_players.

d_onboarding_devices

• id, device_id, client_name, screen_id, created_at, created_by, modified_at, modified_by
• device_id is unique.
• Foreign key: - screen_id -> d_screens.id with ON DELETE SET NULL

Onboarding

• The onboarding flow uses d_onboarding_devices to bind a device to a screen and persist the client name.

Announcements

• d_announcements - announcement content and display metadata.
• d_announcement_screens - announcement-to-screen assignments.

d_announcements

• id, message, short_label, announcement_type, color_key, icon_key, duration_seconds, expires_at, created_at, created_by, modified_at, modified_by
• announcement_type defaults to lower-third.

d_announcement_screens

• announcement_id, screen_id, created_at, created_by, modified_at, modified_by
• Foreign keys: - announcement_id -> d_announcements.id with ON DELETE CASCADE - screen_id -> d_screens.id with ON DELETE CASCADE
• Unique key: (announcement_id, screen_id)

Integrations

• i_rss_feeds - RSS feed definitions and refresh cadence.
• i_rss_feed_items - cached RSS feed items.
• i_api_sources - API source definitions and last response snapshot.
• i_timetable_groups - grouped timetable definitions used by the timetable region.
• i_timetable_entries - dated entries that belong to a timetable group.

i_rss_feeds

• id, name, feed_url, update_interval_value, update_interval_unit, item_limit, enabled, last_pulled_at, created_at, created_by, modified_at, modified_by

i_rss_feed_items

• id, rss_feed_id, position, item_json, created_at, created_by, modified_at, modified_by
• Foreign key: - rss_feed_id -> i_rss_feeds.id with ON DELETE CASCADE
• Unique key: - (rss_feed_id, position)

i_api_sources

• id, name, api_url, auth_method, auth_username, auth_password, auth_bearer_token, auth_header_name, auth_header_value, items_path, update_interval_value, update_interval_unit, enabled, last_pulled_at, last_pull_error, last_response_status, last_response_content_type, last_response_json, created_at, created_by, modified_at, modified_by

i_weather_locations

• id, name, location_label, latitude, longitude, timezone, provider, temperature_unit, wind_unit, precipitation_unit, update_interval_value, update_interval_unit, enabled, last_pulled_at, last_pull_error, last_response_json, created_at, created_by, modified_at, modified_by
• Stores configured weather locations and the most recent provider response used for forecast previews and weather regions.

i_timetable_groups

• id, name, short_description, timezone, created_at, created_by, modified_at, modified_by
• timezone defaults to Europe/London.

i_timetable_entries

• id, schedule_group_id, title, short_description, start_datetime, end_datetime, created_at, created_by, modified_at, modified_by
• Foreign key: - schedule_group_id -> i_timetable_groups.id with ON DELETE CASCADE
• Index: - (schedule_group_id, start_datetime)

Operations

• o_background_tasks - queue and history for background jobs.
• o_app_state - generic app state and version markers stored as key/value pairs.
• o_app_settings - administrator-configurable application settings stored by key.
• o_audit_events - retained audit events for administrator activity and system changes.

o_background_tasks

• id, task_key, task_type, title, category, status, payload_json, metadata_json, attempts, created_at, created_by, started_at, finished_at, error_message
• Indexed by status, task_key, and task_type.

o_app_state

• id, state_key, state_value, created_at, modified_at
• state_key is unique.
• schema_version is stored here so startup can detect the previously recorded schema version before deciding whether migrations need to run.

o_app_settings

• id, setting_key, setting_value, created_at, created_by, modified_at, modified_by
• setting_key is unique.
• Values are stored as JSON and validated against the application setting definitions in src/data/app-settings.js.

o_audit_events

• id, occurred_at, category, event_type, actor_user_id, target_type, target_id, target_label, ip_address, user_agent, details_json
• Indexed by occurrence time, category and event type, actor, and target.

Notes

• The schema is initialized with CREATE TABLE IF NOT EXISTS, so new installs can start from an empty database.
• src/db/bootstrap.js seeds the canvas size defaults, default permissions, and the default administrator role.
• src/db/migrations.js records the current schema version in o_app_state during startup so later launches can tell whether an update is happening.

erDiagram
        A_USERS {
        }
        A_ROLES {
        }
        A_PERMISSIONS {
        }
        A_ROLE_PERMISSIONS {
        }
        A_USER_ROLES {
        }
        A_SESSIONS {
        }
        C_CANVAS_SIZES {
        }
        C_PLAYLISTS {
        }
        C_TEMPLATES {
        }
        C_TEMPLATE_REGIONS {
        }
        C_SLIDES {
        }
        C_PLAYLIST_SLIDES {
        }
        C_PLAYLIST_SLIDE_SCHEDULE_RULES {
        }
        D_PLAYERS {
        }
        D_SCREENS {
        }
        D_ONBOARDING_DEVICES {
        }
        D_ANNOUNCEMENTS {
        }
        D_ANNOUNCEMENT_SCREENS {
        }
        I_RSS_FEEDS {
        }
        I_RSS_FEED_ITEMS {
        }
        I_API_SOURCES {
        }
        I_TIMETABLE_GROUPS {
        }
        I_TIMETABLE_ENTRIES {
        }
        O_APP_STATE {
        }
        O_APP_SETTINGS {
        }
        O_BACKGROUND_TASKS {
        }
        O_AUDIT_EVENTS {
        }

        A_USERS ||--o{ A_USER_ROLES : has
        A_ROLES ||--o{ A_USER_ROLES : assigned_to
        A_ROLES ||--o{ A_ROLE_PERMISSIONS : has
        A_PERMISSIONS ||--o{ A_ROLE_PERMISSIONS : granted_to
        A_USERS ||--o{ A_SESSIONS : owns
        A_USERS ||--o{ O_AUDIT_EVENTS : acts

        C_CANVAS_SIZES ||--o{ C_TEMPLATES : used_by
        C_CANVAS_SIZES ||--o{ C_PLAYLISTS : used_by
        C_TEMPLATES ||--o{ C_TEMPLATE_REGIONS : contains
        C_TEMPLATES ||--o{ C_SLIDES : used_by
        C_PLAYLISTS ||--o{ C_PLAYLIST_SLIDES : contains
        C_SLIDES ||--o{ C_PLAYLIST_SLIDES : included_in
        C_PLAYLIST_SLIDES ||--o{ C_PLAYLIST_SLIDE_SCHEDULE_RULES : has_rules

        C_PLAYLISTS ||--o{ D_SCREENS : uses
        D_SCREENS ||--o{ D_ONBOARDING_DEVICES : binds
        D_ANNOUNCEMENTS ||--o{ D_ANNOUNCEMENT_SCREENS : targets
        D_SCREENS ||--o{ D_ANNOUNCEMENT_SCREENS : receives

        I_RSS_FEEDS ||--o{ I_RSS_FEED_ITEMS : caches
        I_TIMETABLE_GROUPS ||--o{ I_TIMETABLE_ENTRIES : contains