Restore accidentally removed files, a few forecast tweaks

inventory-server/db/daily-deals-schema.sql

@@ -0,0 +1,17 @@
+-- Daily Deals schema for local PostgreSQL
+-- Synced from production MySQL product_daily_deals + product_current_prices
+
+CREATE TABLE IF NOT EXISTS product_daily_deals (
+    deal_id serial PRIMARY KEY,
+    deal_date date NOT NULL,
+    pid bigint NOT NULL,
+    price_id bigint NOT NULL,
+    -- Denormalized from product_current_prices so we don't need to sync that whole table
+    deal_price numeric(10,3),
+    created_at timestamptz DEFAULT NOW(),
+    CONSTRAINT fk_daily_deals_pid FOREIGN KEY (pid) REFERENCES products(pid) ON DELETE CASCADE
+);
+
+CREATE INDEX IF NOT EXISTS idx_daily_deals_date ON product_daily_deals(deal_date);
+CREATE INDEX IF NOT EXISTS idx_daily_deals_pid ON product_daily_deals(pid);
+CREATE UNIQUE INDEX IF NOT EXISTS idx_daily_deals_unique ON product_daily_deals(deal_date, pid);