architecture-beta

    group datasource(internet)[External Data Source]
    group backend(cloud)[Backend]
    group etl(server)[ETL] in backend
    group frontend(internet)[Frontend]

    %% External
    service overpass(internet)[Overpass API] in datasource

    %% Backend - ETL
    service extract(cloud)[Extract] in etl
    service transform(server)[Transform] in etl
    service load(disk)[Load] in etl

    %% Backend - Database
    service postgres(database)[PostgreSQL] in backend
    service postgis(disk)[PostGIS] in backend

    %% Backend - API
    service api(server)[Backend API] in backend
    service scoring(server)[Proccessing] in backend

    %% Frontend
    service web(internet)[Web App] in frontend
    service map(server)[Interactive Map] in frontend


    %% Data Flow
    overpass:R --> L:extract

    extract:R --> L:transform
    transform:R --> L:load
    load:B --> T:postgres

    postgis:T --> B:postgres
    postgres:R --> L:api
    api:L --> R:postgres

    api:R <--> L:web


    api:B --> T:scoring
    scoring:T --> B:api
    map:T --> B:web

erDiagram
    types ||--o{ green_areas : "categorizes"
    vertices ||--o{ ways : "defines source"
    vertices ||--o{ ways : "defines target"

    types {
        INTEGER id PK
        VARCHAR type
    }

    green_areas {
        INTEGER id PK
        BIGINT osm_id
        TEXT name
        INTEGER type_id FK
        GEOMETRY(MultiPolygon) geometry
    }

    vertices {
        INTEGER id PK
        GEOMETRY(Point) geometry
    }

    ways {
        INTEGER id PK
        BIGINT osm_id
        FLOAT length_m
        INTEGER source FK
        INTEGER target FK
        FLOAT cost
        FLOAT reverse_cost
        GEOMETRY(LineString) geometry
    }

    feedback {
        SERIAL id PK
        DOUBLE lat
        DOUBLE lon
        BOOLEAN liked
        DOUBLE accessibility_score
        DOUBLE proximity_score
        DOUBLE quantity_score
        DOUBLE area_score
        DOUBLE diversity_score
        TIMESTAMP timestamp
    }