multiple media upload and smartphone preview

config/migrate_add_media_items.sql

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+-- Migration: Add multi-media support to generated_posts
+-- Date: 2026-02-11
+-- Description: Adds media_items JSONB array to support up to 3 images or 1 video per post
+
+-- Add media_items column
+ALTER TABLE generated_posts ADD COLUMN IF NOT EXISTS media_items JSONB DEFAULT '[]'::JSONB;
+
+-- Add GIN index for performance on JSONB queries
+CREATE INDEX IF NOT EXISTS idx_generated_posts_media_items ON generated_posts USING GIN (media_items);
+
+-- Migrate existing image_url to media_items array
+UPDATE generated_posts
+SET media_items = jsonb_build_array(
+    jsonb_build_object(
+        'type', 'image',
+        'url', image_url,
+        'order', 0,
+        'content_type', 'image/jpeg',
+        'uploaded_at', NOW()
+    )
+)
+WHERE image_url IS NOT NULL AND media_items = '[]'::JSONB;
+
+-- Note: image_url column is kept for backward compatibility
+-- New code should use media_items, but existing code still works
+
+COMMENT ON COLUMN generated_posts.media_items IS 'JSONB array of media items (images/videos). Max 3 items. Structure: [{type, url, order, content_type, uploaded_at, metadata}]';