Add init-scripts/postgres/01_init_dw.sql

init-scripts/postgres/01_init_dw.sql

@@ -0,0 +1,265 @@
+-- ============================================================
+-- INIT SCRIPT: PostgreSQL Data Warehouse
+-- Star Schema for Olist E-commerce
+-- ============================================================
+
+-- Create additional database for Airflow
+SELECT 'CREATE DATABASE airflow_db' WHERE NOT EXISTS (SELECT FROM pg_database WHERE datname = 'airflow_db')\gexec
+
+-- Switch to main DW database
+\c ecommerce_dw;
+
+-- ============================================================
+-- DIMENSION TABLES
+-- ============================================================
+
+CREATE TABLE IF NOT EXISTS dim_time (
+    date_key        INTEGER PRIMARY KEY,
+    full_date       DATE NOT NULL,
+    day_of_week     SMALLINT NOT NULL,      -- 0=Monday, 6=Sunday
+    day_name        VARCHAR(10) NOT NULL,
+    day_of_month    SMALLINT NOT NULL,
+    week_of_year    SMALLINT NOT NULL,
+    month           SMALLINT NOT NULL,
+    month_name      VARCHAR(10) NOT NULL,
+    quarter         SMALLINT NOT NULL,
+    year            SMALLINT NOT NULL,
+    is_weekend      BOOLEAN NOT NULL DEFAULT FALSE,
+    is_holiday      BOOLEAN NOT NULL DEFAULT FALSE
+);
+
+CREATE TABLE IF NOT EXISTS dim_geography (
+    geo_key             SERIAL PRIMARY KEY,
+    zip_code_prefix     VARCHAR(10) NOT NULL,
+    city                VARCHAR(100),
+    state               CHAR(2),
+    state_name          VARCHAR(50),
+    region              VARCHAR(20),
+    latitude            DOUBLE PRECISION,
+    longitude           DOUBLE PRECISION,
+    UNIQUE(zip_code_prefix)
+);
+
+CREATE TABLE IF NOT EXISTS dim_customer (
+    customer_key        SERIAL PRIMARY KEY,
+    customer_id         VARCHAR(50) NOT NULL,
+    customer_unique_id  VARCHAR(50) NOT NULL,
+    zip_code            VARCHAR(10),
+    city                VARCHAR(100),
+    state               CHAR(2),
+    segment             VARCHAR(20) DEFAULT 'standard',
+    lifetime_value      DECIMAL(12, 2) DEFAULT 0,
+    order_count         INTEGER DEFAULT 0,
+    first_order_date    TIMESTAMP,
+    last_order_date     TIMESTAMP,
+    created_at          TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    updated_at          TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    UNIQUE(customer_id)
+);
+
+CREATE TABLE IF NOT EXISTS dim_product (
+    product_key         SERIAL PRIMARY KEY,
+    product_id          VARCHAR(50) NOT NULL,
+    category_pt         VARCHAR(100),
+    category_en         VARCHAR(100),
+    weight_g            INTEGER,
+    length_cm           INTEGER,
+    height_cm           INTEGER,
+    width_cm            INTEGER,
+    photos_qty          SMALLINT,
+    name_length         INTEGER,
+    desc_length         INTEGER,
+    UNIQUE(product_id)
+);
+
+CREATE TABLE IF NOT EXISTS dim_seller (
+    seller_key          SERIAL PRIMARY KEY,
+    seller_id           VARCHAR(50) NOT NULL,
+    zip_code            VARCHAR(10),
+    city                VARCHAR(100),
+    state               CHAR(2),
+    total_orders        INTEGER DEFAULT 0,
+    avg_rating          DECIMAL(3, 2) DEFAULT 0,
+    total_revenue       DECIMAL(14, 2) DEFAULT 0,
+    category_focus      VARCHAR(100),
+    UNIQUE(seller_id)
+);
+
+-- ============================================================
+-- FACT TABLES
+-- ============================================================
+
+CREATE TABLE IF NOT EXISTS fact_orders (
+    order_key               BIGSERIAL PRIMARY KEY,
+    order_id                VARCHAR(50) NOT NULL,
+    customer_key            INTEGER REFERENCES dim_customer(customer_key),
+    seller_key              INTEGER REFERENCES dim_seller(seller_key),
+    product_key             INTEGER REFERENCES dim_product(product_key),
+    date_key                INTEGER REFERENCES dim_time(date_key),
+    geography_key           INTEGER REFERENCES dim_geography(geo_key),
+    
+    -- Order attributes
+    order_status            VARCHAR(20) NOT NULL,
+    item_count              SMALLINT DEFAULT 1,
+    
+    -- Financial measures
+    total_price             DECIMAL(12, 2),
+    total_freight           DECIMAL(12, 2),
+    total_payment           DECIMAL(12, 2),
+    
+    -- Payment details
+    payment_type            VARCHAR(20),
+    payment_installments    SMALLINT,
+    
+    -- Review measures
+    review_score            SMALLINT,
+    review_has_text         BOOLEAN DEFAULT FALSE,
+    
+    -- Delivery measures
+    delivery_days           INTEGER,
+    estimated_delivery_days INTEGER,
+    delivery_delay_days     INTEGER,
+    is_late_delivery        BOOLEAN DEFAULT FALSE,
+    
+    -- Timestamps
+    purchase_timestamp      TIMESTAMP,
+    approved_timestamp      TIMESTAMP,
+    shipped_timestamp       TIMESTAMP,
+    delivered_timestamp     TIMESTAMP,
+    estimated_delivery_date TIMESTAMP,
+    review_timestamp        TIMESTAMP,
+    
+    -- Metadata
+    created_at              TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    UNIQUE(order_id)
+);
+
+CREATE TABLE IF NOT EXISTS fact_order_items (
+    item_key                BIGSERIAL PRIMARY KEY,
+    order_id                VARCHAR(50) NOT NULL,
+    order_item_id           SMALLINT NOT NULL,
+    product_key             INTEGER REFERENCES dim_product(product_key),
+    seller_key              INTEGER REFERENCES dim_seller(seller_key),
+    price                   DECIMAL(12, 2),
+    freight_value           DECIMAL(12, 2),
+    shipping_limit_date     TIMESTAMP,
+    UNIQUE(order_id, order_item_id)
+);
+
+CREATE TABLE IF NOT EXISTS fact_payments (
+    payment_key             BIGSERIAL PRIMARY KEY,
+    order_id                VARCHAR(50) NOT NULL,
+    payment_sequential      SMALLINT NOT NULL,
+    payment_type            VARCHAR(20),
+    payment_installments    SMALLINT,
+    payment_value           DECIMAL(12, 2),
+    UNIQUE(order_id, payment_sequential)
+);
+
+CREATE TABLE IF NOT EXISTS fact_reviews (
+    review_key              BIGSERIAL PRIMARY KEY,
+    review_id               VARCHAR(50) NOT NULL,
+    order_id                VARCHAR(50) NOT NULL,
+    review_score            SMALLINT,
+    review_comment_title    TEXT,
+    review_comment_message  TEXT,
+    review_creation_date    TIMESTAMP,
+    review_answer_timestamp TIMESTAMP,
+    UNIQUE(review_id)
+);
+
+-- ============================================================
+-- AGGREGATION TABLES
+-- ============================================================
+
+CREATE TABLE IF NOT EXISTS agg_daily_revenue (
+    date                DATE PRIMARY KEY,
+    total_revenue       DECIMAL(14, 2),
+    total_freight       DECIMAL(14, 2),
+    gmv                 DECIMAL(14, 2),
+    order_count         INTEGER,
+    avg_order_value     DECIMAL(10, 2),
+    unique_customers    INTEGER,
+    item_count          INTEGER
+);
+
+CREATE TABLE IF NOT EXISTS agg_category_performance (
+    id                  SERIAL PRIMARY KEY,
+    category_en         VARCHAR(100),
+    year_month          VARCHAR(7),
+    revenue             DECIMAL(14, 2),
+    order_count         INTEGER,
+    avg_review_score    DECIMAL(3, 2),
+    avg_price           DECIMAL(10, 2),
+    seller_count        INTEGER,
+    UNIQUE(category_en, year_month)
+);
+
+CREATE TABLE IF NOT EXISTS agg_seller_ranking (
+    seller_key          INTEGER PRIMARY KEY REFERENCES dim_seller(seller_key),
+    seller_id           VARCHAR(50),
+    city                VARCHAR(100),
+    state               CHAR(2),
+    total_revenue       DECIMAL(14, 2),
+    total_freight       DECIMAL(14, 2),
+    order_count         INTEGER,
+    item_count          INTEGER,
+    avg_rating          DECIMAL(3, 2),
+    avg_delivery_days   DECIMAL(5, 1),
+    late_delivery_pct   DECIMAL(5, 2),
+    category_focus      VARCHAR(100)
+);
+
+CREATE TABLE IF NOT EXISTS agg_customer_segments (
+    segment             VARCHAR(20) PRIMARY KEY,
+    customer_count      INTEGER,
+    avg_ltv             DECIMAL(10, 2),
+    avg_orders          DECIMAL(5, 2),
+    avg_review_score    DECIMAL(3, 2),
+    total_revenue       DECIMAL(14, 2)
+);
+
+-- ============================================================
+-- INDEXES
+-- ============================================================
+
+CREATE INDEX IF NOT EXISTS idx_fact_orders_purchase_ts ON fact_orders(purchase_timestamp);
+CREATE INDEX IF NOT EXISTS idx_fact_orders_status ON fact_orders(order_status);
+CREATE INDEX IF NOT EXISTS idx_fact_orders_customer ON fact_orders(customer_key);
+CREATE INDEX IF NOT EXISTS idx_fact_orders_seller ON fact_orders(seller_key);
+CREATE INDEX IF NOT EXISTS idx_fact_orders_product ON fact_orders(product_key);
+CREATE INDEX IF NOT EXISTS idx_fact_orders_date ON fact_orders(date_key);
+CREATE INDEX IF NOT EXISTS idx_fact_order_items_order ON fact_order_items(order_id);
+CREATE INDEX IF NOT EXISTS idx_fact_payments_order ON fact_payments(order_id);
+CREATE INDEX IF NOT EXISTS idx_fact_reviews_order ON fact_reviews(order_id);
+CREATE INDEX IF NOT EXISTS idx_dim_customer_unique ON dim_customer(customer_unique_id);
+CREATE INDEX IF NOT EXISTS idx_dim_customer_state ON dim_customer(state);
+CREATE INDEX IF NOT EXISTS idx_agg_daily_revenue_date ON agg_daily_revenue(date);
+
+-- ============================================================
+-- POPULATE dim_time (2016-2019)
+-- ============================================================
+
+INSERT INTO dim_time (date_key, full_date, day_of_week, day_name, day_of_month, 
+                      week_of_year, month, month_name, quarter, year, is_weekend)
+SELECT 
+    TO_CHAR(d, 'YYYYMMDD')::INTEGER as date_key,
+    d as full_date,
+    EXTRACT(DOW FROM d)::SMALLINT as day_of_week,
+    TO_CHAR(d, 'Day') as day_name,
+    EXTRACT(DAY FROM d)::SMALLINT as day_of_month,
+    EXTRACT(WEEK FROM d)::SMALLINT as week_of_year,
+    EXTRACT(MONTH FROM d)::SMALLINT as month,
+    TO_CHAR(d, 'Month') as month_name,
+    EXTRACT(QUARTER FROM d)::SMALLINT as quarter,
+    EXTRACT(YEAR FROM d)::SMALLINT as year,
+    EXTRACT(DOW FROM d) IN (0, 6) as is_weekend
+FROM generate_series('2016-01-01'::date, '2019-12-31'::date, '1 day'::interval) d
+ON CONFLICT (date_key) DO NOTHING;
+
+-- Brazilian state regions mapping
+INSERT INTO dim_geography (zip_code_prefix, city, state, state_name, region) VALUES
+('00000', 'Unknown', 'XX', 'Unknown', 'Unknown')
+ON CONFLICT (zip_code_prefix) DO NOTHING;
+
+RAISE NOTICE 'PostgreSQL Data Warehouse initialized successfully!';