-- Database migration for eamco_scraper
-- Creates company_prices table for storing historical oil price data

-- Create company_prices table
CREATE TABLE IF NOT EXISTS company_prices (
    id SERIAL PRIMARY KEY,
    company_name VARCHAR(255) NOT NULL,
    town VARCHAR(100),
    price_decimal DECIMAL(6,3) NOT NULL,
    scrape_date DATE NOT NULL,
    zone VARCHAR(50) NOT NULL DEFAULT 'zone10',
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
);

-- Create indexes for efficient querying
CREATE INDEX IF NOT EXISTS idx_company_prices_company ON company_prices(company_name);
CREATE INDEX IF NOT EXISTS idx_company_prices_scrape_date ON company_prices(scrape_date);
CREATE INDEX IF NOT EXISTS idx_company_prices_zone ON company_prices(zone);
CREATE INDEX IF NOT EXISTS idx_company_prices_company_date ON company_prices(company_name, scrape_date);
CREATE INDEX IF NOT EXISTS idx_company_prices_zone_date ON company_prices(zone, scrape_date);

-- Add comment to table
COMMENT ON TABLE company_prices IS 'Historical oil price data scraped from New England Oil website';
COMMENT ON COLUMN company_prices.company_name IS 'Name of the oil company';
COMMENT ON COLUMN company_prices.town IS 'Town where the company operates';
COMMENT ON COLUMN company_prices.price_decimal IS 'Price per gallon in dollars';
COMMENT ON COLUMN company_prices.scrape_date IS 'Date when the price was listed on the website';
COMMENT ON COLUMN company_prices.zone IS 'Geographic zone (e.g., zone10 for Central Massachusetts)';
COMMENT ON COLUMN company_prices.created_at IS 'Timestamp when the record was inserted into database';