Obsidian Insights

Goals:

• Extract & load Northwind via REST API to MotherDuck using dlt.
• Transform using SQLMesh.
• Model the silver layer according to The Hook Cookbook.
• Model the gold layer as a Unified Star Schema.
• Add GitHub Actions for CI/CD and daily ELT.
• Add Apache Iceberg as an alternative to MotherDuck.

How To Run

1. Clone the repo.
2. Run pip install uv, followed by uv sync.
3. Decide if you want to use DuckDB (local) or MotherDuck (remote) as gateway.
   • DuckDB (default)
     1. Add the gateway var in .env: gateway=duckdb. (fallback is this)
     2. Add the duckdb_path var in .env: duckdb_path=your_db.duckdb. (default is ./obsidian_insights.duckdb)
   • MotherDuck
     1. Add the gateway var in .env: gateway=motherduck. (fallback is duckdb)
     2. Create an account on MotherDuck.
     3. Create a database called obsidian_insights.
     4. Create a token.
     5. Add the motherduck_token var in .env: motherduck_token=your_token.
4. Run init_warehouse.sh and follow the prompts.
5. Then run elt.sh whenever you want to refresh the warehouse.

Architecture

graph LR
    %% Source Systems
    source_1[(Northwind)]
    %%source_2[(Adventure Works)]
    
    %% Processing Layer - Using ([text]) for servers
    extract(dlt)
    transform(SQLMesh)
    
    %% Data Warehouse - MotherDuck
    subgraph warehouse[MotherDuck]
        bronze[("BRONZE: Raw → Snapshot")]
        silver[("SILVER: Hook Model")]
        gold[("GOLD: Unified Star Schema")]
    end
    
    %% BI
    bi((BI/ML etc.))
    
    %% Connections
    source_1 --> extract
    %%source_2 --> extract
    extract --> bronze
    bronze --> silver
    silver --> gold
    gold --> bi
    transform -.- bronze
    transform -.- silver
    transform -.- gold

Formulas

!NOTE

I'm using this definition of what a measure is:

A measure is a raw quantifiable value representing a specific aspect of performance, status, or characteristics that must include a temporal anchor specifying the exact point or period in time to which it refers.

I.e., a measure must be associated with a date.

E.g., the amount on an invoice is associated with three dates; incoive date, due date, and payment date. That means there will be three measures: amount invoiced, amount due, amount payed.

Key Performance Indicators

Measures

Measures In The Unified Star Schema

Instead of building a regular bridge, we will turn it into an event based bridge. This will allow us to stack measures in the same graph and on a common date dimension.

This is the normal bridge:

We then add the measurements, along with their corresponding date.

• I.e., # Orders Shipped would set the date to shipped_date.

What happened is that every row got duplicated, with one line per measurement. We can do better than this, we can group it by date.

So, how many orders were placed, required, and shipped per day, for customer X?

Lineage / DAG

flowchart LR
    subgraph obsidian_insights.bronze["obsidian_insights.bronze"]
        direction LR
        raw__northwind__categories(["raw__northwind__categories"])
        raw__northwind__category_details(["raw__northwind__category_details"])
        raw__northwind__customers(["raw__northwind__customers"])
        raw__northwind__employee_territories(["raw__northwind__employee_territories"])
        raw__northwind__employees(["raw__northwind__employees"])
        raw__northwind__order_details(["raw__northwind__order_details"])
        raw__northwind__orders(["raw__northwind__orders"])
        raw__northwind__products(["raw__northwind__products"])
        raw__northwind__regions(["raw__northwind__regions"])
        raw__northwind__shippers(["raw__northwind__shippers"])
        raw__northwind__suppliers(["raw__northwind__suppliers"])
        raw__northwind__territories(["raw__northwind__territories"])
        snp__northwind__categories(["snp__northwind__categories"])
        snp__northwind__category_details(["snp__northwind__category_details"])
        snp__northwind__customers(["snp__northwind__customers"])
        snp__northwind__employee_territories(["snp__northwind__employee_territories"])
        snp__northwind__employees(["snp__northwind__employees"])
        snp__northwind__order_details(["snp__northwind__order_details"])
        snp__northwind__orders(["snp__northwind__orders"])
        snp__northwind__products(["snp__northwind__products"])
        snp__northwind__regions(["snp__northwind__regions"])
        snp__northwind__shippers(["snp__northwind__shippers"])
        snp__northwind__suppliers(["snp__northwind__suppliers"])
        snp__northwind__territories(["snp__northwind__territories"])
    end

    subgraph obsidian_insights.silver["obsidian_insights.silver"]
        direction LR
        bag__northwind__categories(["bag__northwind__categories"])
        bag__northwind__customers(["bag__northwind__customers"])
        bag__northwind__employee_territories(["bag__northwind__employee_territories"])
        bag__northwind__employees(["bag__northwind__employees"])
        bag__northwind__order_details(["bag__northwind__order_details"])
        bag__northwind__orders(["bag__northwind__orders"])
        bag__northwind__products(["bag__northwind__products"])
        bag__northwind__regions(["bag__northwind__regions"])
        bag__northwind__shippers(["bag__northwind__shippers"])
        bag__northwind__suppliers(["bag__northwind__suppliers"])
        bag__northwind__territories(["bag__northwind__territories"])
        int__measures__order_details(["int__measures__order_details"])
        int__measures__orders(["int__measures__orders"])
        int__uss_bridge(["int__uss_bridge"])
        int__uss_bridge__categories(["int__uss_bridge__categories"])
        int__uss_bridge__customers(["int__uss_bridge__customers"])
        int__uss_bridge__employee_territories(["int__uss_bridge__employee_territories"])
        int__uss_bridge__employees(["int__uss_bridge__employees"])
        int__uss_bridge__order_details(["int__uss_bridge__order_details"])
        int__uss_bridge__orders(["int__uss_bridge__orders"])
        int__uss_bridge__products(["int__uss_bridge__products"])
        int__uss_bridge__regions(["int__uss_bridge__regions"])
        int__uss_bridge__shippers(["int__uss_bridge__shippers"])
        int__uss_bridge__suppliers(["int__uss_bridge__suppliers"])
        int__uss_bridge__territories(["int__uss_bridge__territories"])
    end

    subgraph obsidian_insights.gold["obsidian_insights.gold"]
        direction LR
        _bridge(["_bridge"])
        calendar(["calendar"])
        categories(["categories"])
        customers(["customers"])
        employees(["employees"])
        order_details(["order_details"])
        orders(["orders"])
        products(["products"])
        regions(["regions"])
        shippers(["shippers"])
        suppliers(["suppliers"])
        territories(["territories"])
    end

    %% obsidian_insights.bronze -> obsidian_insights.bronze
    raw__northwind__categories --> snp__northwind__categories
    raw__northwind__category_details --> snp__northwind__category_details
    raw__northwind__customers --> snp__northwind__customers
    raw__northwind__employee_territories --> snp__northwind__employee_territories
    raw__northwind__employees --> snp__northwind__employees
    raw__northwind__order_details --> snp__northwind__order_details
    raw__northwind__orders --> snp__northwind__orders
    raw__northwind__products --> snp__northwind__products
    raw__northwind__regions --> snp__northwind__regions
    raw__northwind__shippers --> snp__northwind__shippers
    raw__northwind__suppliers --> snp__northwind__suppliers
    raw__northwind__territories --> snp__northwind__territories

    %% obsidian_insights.bronze -> obsidian_insights.silver
    snp__northwind__category_details --> bag__northwind__categories
    snp__northwind__customers --> bag__northwind__customers
    snp__northwind__employee_territories --> bag__northwind__employee_territories
    snp__northwind__employees --> bag__northwind__employees
    snp__northwind__order_details --> bag__northwind__order_details
    snp__northwind__orders --> bag__northwind__orders
    snp__northwind__products --> bag__northwind__products
    snp__northwind__regions --> bag__northwind__regions
    snp__northwind__shippers --> bag__northwind__shippers
    snp__northwind__suppliers --> bag__northwind__suppliers
    snp__northwind__territories --> bag__northwind__territories

    %% obsidian_insights.silver -> obsidian_insights.silver
    bag__northwind__categories --> int__uss_bridge__categories
    bag__northwind__categories --> int__uss_bridge__order_details
    bag__northwind__customers --> int__uss_bridge__customers
    bag__northwind__customers --> int__uss_bridge__order_details
    bag__northwind__customers --> int__uss_bridge__orders
    bag__northwind__employee_territories --> int__uss_bridge__employee_territories
    bag__northwind__employees --> int__uss_bridge__employee_territories
    bag__northwind__employees --> int__uss_bridge__employees
    bag__northwind__employees --> int__uss_bridge__order_details
    bag__northwind__employees --> int__uss_bridge__orders
    bag__northwind__order_details --> int__measures__order_details
    bag__northwind__order_details --> int__uss_bridge__order_details
    bag__northwind__orders --> int__measures__order_details
    bag__northwind__orders --> int__measures__orders
    bag__northwind__orders --> int__uss_bridge__order_details
    bag__northwind__orders --> int__uss_bridge__orders
    bag__northwind__products --> int__uss_bridge__order_details
    bag__northwind__products --> int__uss_bridge__products
    bag__northwind__regions --> int__uss_bridge__employee_territories
    bag__northwind__regions --> int__uss_bridge__regions
    bag__northwind__regions --> int__uss_bridge__territories
    bag__northwind__shippers --> int__uss_bridge__order_details
    bag__northwind__shippers --> int__uss_bridge__orders
    bag__northwind__shippers --> int__uss_bridge__shippers
    bag__northwind__suppliers --> int__uss_bridge__order_details
    bag__northwind__suppliers --> int__uss_bridge__products
    bag__northwind__suppliers --> int__uss_bridge__suppliers
    bag__northwind__territories --> int__uss_bridge__employee_territories
    bag__northwind__territories --> int__uss_bridge__territories
    int__measures__order_details --> int__uss_bridge__order_details
    int__measures__orders --> int__uss_bridge__orders
    int__uss_bridge__categories --> int__uss_bridge
    int__uss_bridge__customers --> int__uss_bridge
    int__uss_bridge__employee_territories --> int__uss_bridge
    int__uss_bridge__employees --> int__uss_bridge
    int__uss_bridge__order_details --> int__uss_bridge
    int__uss_bridge__orders --> int__uss_bridge
    int__uss_bridge__products --> int__uss_bridge
    int__uss_bridge__regions --> int__uss_bridge
    int__uss_bridge__shippers --> int__uss_bridge
    int__uss_bridge__suppliers --> int__uss_bridge
    int__uss_bridge__territories --> int__uss_bridge

    %% obsidian_insights.silver -> obsidian_insights.gold
    bag__northwind__categories --> categories
    bag__northwind__customers --> customers
    bag__northwind__employees --> employees
    bag__northwind__order_details --> order_details
    bag__northwind__orders --> orders
    bag__northwind__products --> products
    bag__northwind__regions --> regions
    bag__northwind__shippers --> shippers
    bag__northwind__suppliers --> suppliers
    bag__northwind__territories --> territories
    int__uss_bridge --> _bridge
    int__uss_bridge --> calendar

ERDs

bronze.*

bronze.raw__northwind__*

flowchart LR
    raw__northwind__orders("raw__northwind__orders")
    raw__northwind__order_details("raw__northwind__order_details")
    raw__northwind__products("raw__northwind__products")
    
    raw__northwind__category_details(["raw__northwind__category_details"])
    raw__northwind__customers(["raw__northwind__customers"])
    raw__northwind__employee_territories(["raw__northwind__employee_territories"])
    raw__northwind__employees(["raw__northwind__employees"])
    raw__northwind__region(["raw__northwind__region"])
    raw__northwind__shippers(["raw__northwind__shippers"])
    raw__northwind__suppliers(["raw__northwind__suppliers"])
    raw__northwind__territories(["raw__northwind__territories"])

    raw__northwind__order_details --> raw__northwind__orders
    raw__northwind__order_details --> raw__northwind__products
    raw__northwind__products --> raw__northwind__category_details
    raw__northwind__products --> raw__northwind__suppliers
    raw__northwind__orders --> raw__northwind__employees
    raw__northwind__orders --> raw__northwind__customers
    raw__northwind__orders --> raw__northwind__shippers
    raw__northwind__territories --> raw__northwind__region
    raw__northwind__employee_territories --> raw__northwind__territories
    raw__northwind__employee_territories --> raw__northwind__employees

silver.*

flowchart LR
        _hook__reference__category(["_hook__reference__category"])
        _hook__reference__region(["_hook__reference__region"])
        _hook__reference__territory(["_hook__reference__territory"])
        _hook__customer(["_hook__customer"])
        _hook__employee(["_hook__employee"])
        _hook__order(["_hook__order"])
        _hook__product(["_hook__product"])
        _hook__shipper(["_hook__shipper"])
        _hook__supplier(["_hook__supplier"])
 
        bag__northwind__categories[("bag__northwind__categories")]
        bag__northwind__customers[("bag__northwind__customers")]
        bag__northwind__employees[("bag__northwind__employees")]
        bag__northwind__employee_territories[("bag__northwind__employee_territories")]
        bag__northwind__orders[("bag__northwind__orders")]
        bag__northwind__order_details[("bag__northwind__order_details")]
        bag__northwind__products[("bag__northwind__products")]
        bag__northwind__regions[("bag__northwind__regions")]
        bag__northwind__shippers[("bag__northwind__shippers")]
        bag__northwind__suppliers[("bag__northwind__suppliers")]
        bag__northwind__territories[("bag__northwind__territories")]

    bag__northwind__order_details --> _hook__order --> bag__northwind__orders
    bag__northwind__order_details --> _hook__product --> bag__northwind__products
    bag__northwind__products --> _hook__reference__category --> bag__northwind__categories
    bag__northwind__products --> _hook__supplier --> bag__northwind__suppliers
    bag__northwind__orders --> _hook__employee --> bag__northwind__employees
    bag__northwind__orders --> _hook__customer --> bag__northwind__customers
    bag__northwind__orders --> _hook__shipper --> bag__northwind__shippers
    bag__northwind__territories --> _hook__reference__region --> bag__northwind__regions
    bag__northwind__employee_territories --> _hook__reference__territory --> bag__northwind__territories
    bag__northwind__employee_territories --> _hook__employee

gold.*

flowchart LR
    _bridge("_bridge")

    categories(["categories"])
    customers(["customers"])
    employees(["employees"])
    order_details(["order_details"])
    orders(["orders"])
    products(["products"])
    regions(["regions"])
    shippers(["shippers"])
    suppliers(["suppliers"])
    territories(["territories"])
    calendar(["calendar"])

    _bridge --> categories
    _bridge --> customers
    _bridge --> employees
    _bridge --> order_details
    _bridge --> orders
    _bridge --> products
    _bridge --> regions
    _bridge --> shippers
    _bridge --> suppliers
    _bridge --> territories
    _bridge --> calendar