= 1.6.0 =

* Multisite: put the settings and statistics panels on the main site only.

= 1.5.7 =

* Flush the cache immediately after any software installation or upgrade operation.
* To eliminate state data delete all transients from the database on activation and deactivation.
* Add a Help tab and hyperlink to the statistics display.

= 1.5.6 =

* Fix a warning while generating diagnostic info.
* Update wp-config.php more robustly.

= 1.5.5 =

* Some diagnostic data now appears in Site Health - Info.
* The drop-in no longer attempts to load translations early, to eliminate an unterminated recursion.
* A problem with index creation on ancient SQLite versions is corrected.

= 1.5.4 =

* Handle non-persistent groups, get_multiple cache misses, and MS-DOS line breaks correctly.

= 1.5.2 =

* Correct a regression in object fetching (failure to clone when needed).
* Correct wrong display of Use APCu checkbox immediately after setting change

= 1.5.1 =

* Provide APCu opt-in on the settings page.

= 1.5.0 =

* Use APCu to increase performance if it is available and if WP_SQLITE_OBJECT_CACHE_APCU is defined.

= 1.4.1 =

* More efficient testing for drop-in validity.
* More accurate least-recently-updated cleanup.

= 1.4.0 =

* Add WP-CLI support.
* Make sure to close .sqlite files to avoid file-descriptor leaks in long-running processes. Props to Matt Jones.

= 1.3.8 =

Add some support for new SQLite WAL2 write-ahead logging.
Support WordPress 6.5.

= 1.3.7 =

Bug fix: Not all versions of SQLite can do DELETE ... LIMIT, so do transaction-size-limited DELETEs a different way.

= 1.3.6 =

* Clean up in chunks in an attempt to reduce contention delays and timeouts.
* Do PRAGMA wal_checkpoint(RESTART) when cleaning up, and also occasionally, to prevent the write-ahead log from growing without bound on busy systems.
* Retry three times if cache updates time out.
* Increase default cache size to 16MiB for new users.

= 1.3.5 =

* php 8.1, php 8.2 compatibility.
* Support for WordFence and other code using the object cache after shutdown.

= 1.3.4 =

* Support SQLite Memory-Mapped I/O.
* Reduce contention delays by limiting the number of get_multiple, set_multiple, add_multiple, and delete_multiple items in each transaction.
* Reduce index page fragmentation by using key order for set_multiple and add_multiple operations.
* Fix initialization defect in cache deletion. Props to @gRoberts84.

= 1.3.2 =

* Avoid VACUUM except on cache flush, and do it only with maintenance mode enabled.

= 1.3.1 =

* Look for a too-large cache with a 0.001 probability on every pageview, and purge it. This works around disabled or too-infrequent WP_Cron operations.

= 1.3.0 =

* Optimize wp_cache_get_multiple, using SQL BETWEEN to fetch consecutive cache entries.
* Do not expire old entries. Instead control cache size by purging least recently changed entries.

= 1.2.3 =

* Sanitize the WP_CACHE_KEY_SALT value.
* Avoid using up all the RAM when reporting on many statistics.

= 1.2.2 =

* Fix exception-handling bug.
* In the size display on the Statistics panel, summarize repetitive WooCommerce cache groups.

= 1.2.1 =

* Implement wp_cache_flush_runtime() correctly.

= 1.2.0 =

* Better exception handling.
* More secure storage of database files.

= 1.1.1 =

* Switch from MEMORY to WAL for SQLite's journaling mode.
* Implement some wp-config.php settings:

  WP_SQLITE_OBJECT_CACHE_DB_FILE. sqlite file pathname. Default: …/wp-content/.ht.object_cache.sqlite .

  WP_SQLITE_OBJECT_CACHE_TIMEOUT SQLite timeout. Default: 5000 milliseconds.

  WP_SQLITE_OBJECT_CACHE_JOURNAL_MODE Default: ‘WAL’. Possible values DELETE | TRUNCATE | PERSIST | MEMORY | WAL | NONE. See https://www.sqlite.org/pragma.html#pragma_journal_mode

= 1.1.0 =

* Increase the SQLite wait timeout from 0.5sec to 5.0sec, trying to deal with rare long wait to perform an SQLite operation. #10.
* Switch SQLite's journaling mode from MEMORY to WAL trying to reduce contention between readers and writers.
* Show p1 first-percentile and p99 99th-percentile times in the Statistics panel along with p5, median, mean, p95.
* Add wp-config.php settings for timeout and journaliing mode along with filename.
* Test with WordPress 5.5, the earliest version that does not require the obsolete mysql extension.
* Change performance logging from time-based to random sampling to reduce overhead.
* Fix a race condition upserting cached values under load in pre-3.24 SQLite.
* Show availability of the space-saving igbinary serialization on dashboard panels.

This application of SQLite puts its concurrency-handling code to the test.

= 1.0.0 =

1. Use `.ht.object-cache.sqlite` for cached data to prevent downloading it via the web server.
2. Add support for the `WP_SQLITE_OBJECT_CACHE_DB_FILE` constant.
3. It's possible for the sqlite cache file to become corrupt if a server process crashes. When detecting that kind of situation, the plugin now deletes and rebuilds it.

= 0.1.7 = First release