Fix DB migration for SQLite. Backup secondary tables to avoid losing data#527
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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`.
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The table
torrust_torrentshas 8 secondary tables that reference it with a foreign key: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_torrentstable which triggers a DELETE ON CASCADE, deleting all the related records in secondary tables.The secondary tables are:
These tables store the torrent file fiel together with the master
torrust_torrents.