[update] added migration scripts for migrating news data to articles, geographic and category tagging, and default sharing templates

backend-rust/migrations/007_migrate_data_from_news_to_articles.down.sql

@@ -0,0 +1,39 @@
+-- Remove migrated data (this will remove all articles and tags created from migration)
+-- WARNING: This will delete all migrated data
+
+-- Remove legacy migration records
+DELETE
+FROM legacy_migration
+WHERE old_filter_type IN ('country', 'category');
+
+-- Remove article-tag associations for migrated data (non-AI generated)
+DELETE
+FROM article_tags
+WHERE ai_generated = 0;
+
+-- Remove migrated geographic tags (only those created from country data)
+DELETE
+FROM tags
+WHERE tags.category = 'geographic'
+  AND EXISTS (SELECT 1 FROM news WHERE news.country = tags.name);
+
+-- Remove migrated content tags (only those created from category data)
+DELETE
+FROM tags
+WHERE tags.category = 'content'
+  AND EXISTS (SELECT 1 FROM news WHERE news.category = tags.name);
+
+-- Remove migrated articles (only those that match news entries)
+DELETE
+FROM articles
+WHERE EXISTS (SELECT 1
+              FROM news
+              WHERE news.url = articles.url
+                AND news.title = articles.title
+                AND articles.source_type = 'rss');
+
+-- Reset tag usage counts
+UPDATE tags
+SET usage_count = (SELECT COUNT(*)
+                   FROM article_tags
+                   WHERE tag_id = tags.id);