add: torrent soft deletion support

HDInnovations/UNIT3D-Community-Edition#3927

src/scheduler/torrent_update.rs

@@ -155,18 +155,6 @@ impl Queue {
             .await
             .map(|result| result.rows_affected());
 
-        if rows_affected_res.is_ok() {
-            // When torrent records are upserted after they have been deleted
-            // since the last flush interval, the record gets unintentionally
-            // re-inserted. So, we need to delete it again. All re-inserted
-            // records would have an info_hash of 20 bytes worth of binary 0.
-            let _ = sqlx::query!(
-                r#"DELETE from torrents WHERE info_hash = '\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0'"#
-            )
-            .execute(db)
-            .await;
-        }
-
         rows_affected_res
     }
 }

src/tracker/torrent.rs

@@ -76,6 +76,8 @@ impl Map {
                     0 as `is_deleted: bool`
                 FROM
                     torrents
+                WHERE
+                    torrents.deleted_at IS NULL
             "#
         )
         .fetch_all(db)

src/tracker/torrent/infohash2id.rs

@@ -36,6 +36,8 @@ impl Map {
                     torrents.info_hash as `info_hash: InfoHash`
                 FROM
                     torrents
+                WHERE
+                    torrents.deleted_at IS NULL
             "#
         )
         .fetch_all(db)