feat(marketplace): add migrations 095-097 for products enrichment, previews, images

veza-backend-api/migrations/095_products_enrichment.sql

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+-- v0.401 M1: Add BPM, musical_key, category to products
+-- Prerequisite: products table exists (GORM or prior migration)
+
+DO $$
+BEGIN
+  IF EXISTS (SELECT 1 FROM information_schema.tables WHERE table_schema = 'public' AND table_name = 'products') THEN
+    ALTER TABLE products ADD COLUMN IF NOT EXISTS bpm INTEGER;
+    ALTER TABLE products ADD COLUMN IF NOT EXISTS musical_key VARCHAR(10);
+    ALTER TABLE products ADD COLUMN IF NOT EXISTS category VARCHAR(50);
+    CREATE INDEX IF NOT EXISTS idx_products_category ON products(category) WHERE category IS NOT NULL;
+    CREATE INDEX IF NOT EXISTS idx_products_bpm ON products(bpm) WHERE bpm IS NOT NULL;
+    CREATE INDEX IF NOT EXISTS idx_products_musical_key ON products(musical_key) WHERE musical_key IS NOT NULL AND musical_key != '';
+  END IF;
+END $$;

veza-backend-api/migrations/096_product_previews.sql

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+-- v0.401 M1: Product previews (audio demo files)
+-- Prerequisite: products table exists
+
+DO $$
+BEGIN
+  IF EXISTS (SELECT 1 FROM information_schema.tables WHERE table_schema = 'public' AND table_name = 'products') THEN
+    IF NOT EXISTS (SELECT 1 FROM information_schema.tables WHERE table_schema = 'public' AND table_name = 'product_previews') THEN
+      CREATE TABLE product_previews (
+        id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+        product_id UUID NOT NULL REFERENCES products(id) ON DELETE CASCADE,
+        file_path VARCHAR(512) NOT NULL,
+        duration_sec INTEGER,
+        created_at TIMESTAMPTZ DEFAULT NOW()
+      );
+      CREATE INDEX idx_product_previews_product_id ON product_previews(product_id);
+    END IF;
+  END IF;
+END $$;

veza-backend-api/migrations/097_product_images.sql

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+-- v0.401 M1: Product images (multiple images per product)
+-- Prerequisite: products table exists
+
+DO $$
+BEGIN
+  IF EXISTS (SELECT 1 FROM information_schema.tables WHERE table_schema = 'public' AND table_name = 'products') THEN
+    IF NOT EXISTS (SELECT 1 FROM information_schema.tables WHERE table_schema = 'public' AND table_name = 'product_images') THEN
+      CREATE TABLE product_images (
+        id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+        product_id UUID NOT NULL REFERENCES products(id) ON DELETE CASCADE,
+        url VARCHAR(512) NOT NULL,
+        sort_order INTEGER DEFAULT 0,
+        created_at TIMESTAMPTZ DEFAULT NOW()
+      );
+      CREATE INDEX idx_product_images_product_id ON product_images(product_id);
+    END IF;
+  END IF;
+END $$;