-- Migration 118: Inventory snapshots table
-- Lightweight per-product tracking for sales velocity estimation
-- Part of Real-Time Inventory Tracking feature

CREATE TABLE IF NOT EXISTS inventory_snapshots (
  id BIGSERIAL PRIMARY KEY,
  dispensary_id INT NOT NULL REFERENCES dispensaries(id) ON DELETE CASCADE,
  product_id TEXT NOT NULL,           -- provider_product_id (normalized across platforms)
  captured_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),

  -- Platform (for debugging/filtering)
  platform TEXT NOT NULL,             -- 'dutchie' | 'jane' | 'treez'

  -- Inventory fields (normalized from all platforms)
  quantity_available INT,             -- Dutchie: quantityAvailable, Jane: quantity, Treez: quantityAvailable
  is_below_threshold BOOLEAN,         -- Dutchie: isBelowThreshold, Jane: computed, Treez: lowInventory
  status TEXT,                        -- Active/Inactive/available

  -- Price fields (normalized)
  price_rec NUMERIC(10,2),            -- recreational price
  price_med NUMERIC(10,2),            -- medical price (if different)

  -- Denormalized for fast queries
  brand_name TEXT,
  category TEXT,
  product_name TEXT
);

-- Primary query: get snapshots for a store over time
CREATE INDEX idx_inv_snap_store_time ON inventory_snapshots(dispensary_id, captured_at DESC);

-- Delta calculation: get consecutive snapshots for a product
CREATE INDEX idx_inv_snap_product_time ON inventory_snapshots(dispensary_id, product_id, captured_at DESC);

-- Brand-level analytics
CREATE INDEX idx_inv_snap_brand_time ON inventory_snapshots(brand_name, captured_at DESC) WHERE brand_name IS NOT NULL;

-- Platform filtering
CREATE INDEX idx_inv_snap_platform ON inventory_snapshots(platform, captured_at DESC);

-- Retention cleanup (30 days) - simple index, cleanup job handles the WHERE
CREATE INDEX IF NOT EXISTS idx_inv_snap_cleanup ON inventory_snapshots(captured_at);

-- Comments
COMMENT ON TABLE inventory_snapshots IS 'Lightweight inventory snapshots for sales velocity tracking. Retained 30 days.';
COMMENT ON COLUMN inventory_snapshots.product_id IS 'Provider product ID, normalized across platforms';
COMMENT ON COLUMN inventory_snapshots.platform IS 'Menu platform: dutchie, jane, or treez';
COMMENT ON COLUMN inventory_snapshots.quantity_available IS 'Current quantity in stock (Dutchie: quantityAvailable, Jane: quantity)';