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Merge #527: Fix DB migration for SQLite. Backup secondary tables to a…
…void losing data 094ab8a fix: linter errors (Jose Celano) bd935b3 fix: [#526] DB migration for SQLite. Backup secondary tables (Jose Celano) Pull request description: The table `torrust_torrents` has 8 secondary tables that reference it with a foreign key: ```sql FOREIGN KEY("torrent_id") REFERENCES "torrust_torrents"("torrent_id") ON DELETE CASCADE, ``` The migration fixed in this commit creates a new table in order to alter it and drops the old one. However, when you drop the old table, SQLite uses an implicit DELETE query for the `torrust_torrents` table which triggers a DELETE ON CASCADE, deleting all the related records in secondary tables. The secondary tables are: - torrust_torrent_files - torrust_torrent_announce_urls - torrust_torrent_info - torrust_torrent_tracker_stats - torrust_torrent_tag_links - torrust_torrent_info_hashes - torrust_torrent_http_seeds - torrust_torrent_nodes These tables store the torrent file fiel together with the master `torrust_torrents`. ACKs for top commit: josecelano: ACK 094ab8a Tree-SHA512: 631a40ac3645c67430831a681e04d91c0dc4a62efe9bb65036abb3bf992c1bb289b7af7ca3ca417c4cec0911a64c778b0e0fffedfe7dbf9f5ba1c8af28933f23
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