Double check whether database needs to be updated

Prevents qBittorrent from being failed to start after torrents database metadata is corrupted by one of the first releases of v4.5.x series.

PR #19668.
Closes #19622.

src/base/bittorrent/dbresumedatastorage.cpp

@@ -611,10 +611,15 @@ void BitTorrent::DBResumeDataStorage::updateDB(const int fromVersion) const
 
         if (fromVersion <= 4)
         {
-            const auto alterTableTorrentsQuery = u"ALTER TABLE %1 ADD %2"_s
-                    .arg(quoted(DB_TABLE_TORRENTS), makeColumnDefinition(DB_COLUMN_INACTIVE_SEEDING_TIME_LIMIT, "INTEGER NOT NULL DEFAULT -2"));
-            if (!query.exec(alterTableTorrentsQuery))
-                throw RuntimeError(query.lastError().text());
+            const auto testQuery = u"SELECT COUNT(%1) FROM %2;"_s
+                    .arg(quoted(DB_COLUMN_INACTIVE_SEEDING_TIME_LIMIT.name), quoted(DB_TABLE_TORRENTS));
+            if (!query.exec(testQuery))
+            {
+                const auto alterTableTorrentsQuery = u"ALTER TABLE %1 ADD %2"_s
+                        .arg(quoted(DB_TABLE_TORRENTS), makeColumnDefinition(DB_COLUMN_INACTIVE_SEEDING_TIME_LIMIT, "INTEGER NOT NULL DEFAULT -2"));
+                if (!query.exec(alterTableTorrentsQuery))
+                    throw RuntimeError(query.lastError().text());
+            }
         }
 
         const QString updateMetaVersionQuery = makeUpdateStatement(DB_TABLE_META, {DB_COLUMN_NAME, DB_COLUMN_VALUE});