Feature/new archiving (#2335)

* Change archiving config page layout

I've changed some wording and moved actions into a
maintenance section.

* Update purge action

Now we have more control on the purge action. The configuration allows
us to choose what to keep and what to discard in a more precise way.
At the moment, the configuration applies for all feeds.

* Add purge configuration on feed level

Now the extend purge configuration is available on feed level.
It is stored as attributes and will be used in the purge action.

* Update purge action

Now the purge action uses the feed configuration if it exists and
defaults on user configuration if not.

* Add empty option in period list

* Fix configuration warnings

* Add archiving configuration on categories

See #2369

* Add user info back

* Add explanations in UI

* Fixes for SQLite + error + misc.

* Fix invalid feed reference

* Short array syntax

Only for new code, so far

* Fix prefix error

* Query performance, default values

Work in progress

* Fix default values and confirm before leaving

Form cancel and confirm changes before leaving were broken.
And start taking advantage of the short echo syntax `<?= ?>` as we have
moved to PHP 5.4+

* More work

* Tuning SQL

* Fix MariaDB + performance issue

* SQL performance

* Fix SQLite bug

* Fix some attributes JSON encoding bugs

Especially for SQLite export/import

* More uniform, fix bugs

More uniform between global, category, feed settings

* Drop special cases for old articles during refresh

Instead will use lastSeen date with the new archiving logic.
This was generating problems anyway
https://github.com/FreshRSS/FreshRSS/issues/2154

* Draft drop index keep_history

Not needed anymore

* MySQL typo

Now properly tested with MySQL, PostgreSQL, SQLite

* More work for legacy values

Important to avoid overriding user's preference and risking deleting
data erroneously

* Fix PHP 7.3 / 7.4 warnings

@aledeg "Trying to use values of type null, bool, int, float or resource
as an array (such as $null["key"]) will now generate a notice. "
https://php.net/migration74.incompatible

* Reintroduce min articles and take care of legacy parameters

* A few changes forgotten

* Draft of migration + DROP of feed.keep_history

* Fix several errors

And give up using const for SQL to allow multiple database types (and we
cannot redefine a const)

* Add keep_min to categories + factorise archiving logic

* Legacy fix

* Fix bug yield from

* Minor: Use JSON_UNESCAPED_SLASHE for attributes

And make more uniform

* Fix sign and missing variable

* Fine tune the logic

3 files changed, 309 insertions, 30 deletions

diff --git a/app/views/configure/archiving.phtml b/app/views/configure/archiving.phtml
index 09be55fd9..0387a2b96 100644
--- a/app/views/configure/archiving.phtml
+++ b/app/views/configure/archiving.phtml
@@ -9,23 +9,6 @@
 		<p><?php echo _i('help'); ?> <?php echo _t('conf.archiving.help'); ?></p>
 
 		<div class="form-group">
-			<label class="group-name" for="old_entries"><?php echo _t('conf.archiving.delete_after'); ?></label>
-			<div class="group-controls">
-				<input type="number" id="old_entries" name="old_entries" min="1" max="1200" value="<?php echo FreshRSS_Context::$user_conf->old_entries; ?>" data-leave-validation="<?php echo FreshRSS_Context::$user_conf->old_entries; ?>"/> <?php echo _t('gen.date.month'); ?>
-				  <a class="btn confirm" href="<?php echo _url('entry', 'purge'); ?>"><?php echo _t('conf.archiving.purge_now'); ?></a>
-			</div>
-		</div>
-		<div class="form-group">
-			<label class="group-name" for="keep_history_default"><?php echo _t('conf.archiving.keep_history_by_feed'); ?></label>
-			<div class="group-controls">
-				<select class="number" name="keep_history_default" id="keep_history_default" required="required" data-leave-validation="<?php echo FreshRSS_Context::$user_conf->keep_history_default; ?>"><?php
-					foreach (array('' => '', 0 => '0', 10 => '10', 50 => '50', 100 => '100', 500 => '500', 1000 => '1 000', 5000 => '5 000', 10000 => '10 000', FreshRSS_Feed::KEEP_HISTORY_INFINITE => '∞') as $v => $t) {
-						echo '<option value="' . $v . (FreshRSS_Context::$user_conf->keep_history_default == $v ? '" selected="selected' : '') . '">' . $t . ' </option>';
-					}
-				?></select> (<?php echo _t('gen.short.by_default'); ?>)
-			</div>
-		</div>
-		<div class="form-group">
 			<label class="group-name" for="ttl_default"><?php echo _t('conf.archiving.ttl'); ?></label>
 			<div class="group-controls">
 				<select class="number" name="ttl_default" id="ttl_default" required="required" data-leave-validation="<?php echo FreshRSS_Context::$user_conf->ttl_default; ?>"><?php
@@ -47,6 +30,76 @@
 			</div>
 		</div>
 
+		<p class="alert alert-warn">
+			<?= _t('conf.archiving.policy_warning') ?>
+		</p>
+
+		<div class="form-group">
+			<label class="group-name"><?= _t('conf.archiving.policy') ?><br /><small>(<?= _t('gen.short.by_default') ?>)</small></label>
+			<div class="group-controls">
+				<label class="checkbox" for="enable_keep_max">
+					<input type="checkbox" name="enable_keep_max" id="enable_keep_max" value="1"<?= empty(FreshRSS_Context::$user_conf->archiving['keep_max']) ? '' : ' checked="checked"' ?> data-leave-validation="<?= empty(FreshRSS_Context::$user_conf->archiving['keep_max']) ? 0 : 1 ?>"/>
+					<?= _t('conf.archiving.keep_max') ?>
+					<?php $keepMax = empty(FreshRSS_Context::$user_conf->archiving['keep_max']) ? 200 : FreshRSS_Context::$user_conf->archiving['keep_max']; ?>
+					<input type="number" id="keep_max" name="keep_max" min="0" value="<?= $keepMax ?>" data-leave-validation="<?= $keepMax ?>"/>
+				</label>
+			</div>
+		</div>
+
+		<div class="form-group">
+			<div class="group-controls">
+				<label class="checkbox" for="enable_keep_period">
+					<input type="checkbox" name="enable_keep_period" id="enable_keep_period" value="1"<?= FreshRSS_Context::$user_conf->volatile['enable_keep_period'] ? ' checked="checked"' : '' ?> data-leave-validation="<?= FreshRSS_Context::$user_conf->volatile['enable_keep_period'] ? 1 : 0 ?>"/>
+					<?= _t('conf.archiving.keep_period') ?>
+					<input type="number" id="keep_period_count" name="keep_period_count" min="0" value="<?= FreshRSS_Context::$user_conf->volatile['keep_period_count'] ?>" data-leave-validation="<?= FreshRSS_Context::$user_conf->volatile['keep_period_count'] ?>"/>
+					<select class="number" name="keep_period_unit" id="keep_period_unit" data-leave-validation="<?= FreshRSS_Context::$user_conf->volatile['keep_period_unit'] ?>">
+						<option></option>
+						<option value="P1Y" <?= 'P1Y' === FreshRSS_Context::$user_conf->volatile['keep_period_unit'] ? 'selected="selected"' : '' ?>><?= _t('gen.period.years') ?></option>
+						<option value="P1M" <?= 'P1M' === FreshRSS_Context::$user_conf->volatile['keep_period_unit'] ? 'selected="selected"' : '' ?>><?= _t('gen.period.months') ?></option>
+						<option value="P1W" <?= 'P1W' === FreshRSS_Context::$user_conf->volatile['keep_period_unit'] ? 'selected="selected"' : '' ?>><?= _t('gen.period.weeks') ?></option>
+						<option value="P1D" <?= 'P1D' === FreshRSS_Context::$user_conf->volatile['keep_period_unit'] ? 'selected="selected"' : '' ?>><?= _t('gen.period.days') ?></option>
+						<option value="PT1H" <?= 'PT1H' === FreshRSS_Context::$user_conf->volatile['keep_period_unit'] ? 'selected="selected"' : '' ?>><?= _t('gen.period.hours') ?></option>
+					</select>
+				</label>
+			</div>
+		</div>
+
+		<div class="form-group">
+			<label class="group-name"><?= _t('conf.archiving.exception') ?><br /><small>(<?= _t('gen.short.by_default') ?>)</small></label>
+			<div class="group-controls">
+				<label class="checkbox" for="keep_favourites">
+					<input type="checkbox" name="keep_favourites" id="keep_favourites" value="1"<?= FreshRSS_Context::$user_conf->archiving['keep_favourites'] !== false ? ' checked="checked"' : '' ?> data-leave-validation="<?= FreshRSS_Context::$user_conf->archiving['keep_favourites'] !== false ? 1 : 0 ?>"/>
+					<?= _t('conf.archiving.keep_favourites') ?>
+				</label>
+			</div>
+		</div>
+
+		<div class="form-group">
+			<div class="group-controls">
+				<label class="checkbox" for="keep_labels">
+					<input type="checkbox" name="keep_labels" id="keep_labels" value="1"<?= FreshRSS_Context::$user_conf->archiving['keep_labels'] !== false ? ' checked="checked"' : '' ?> data-leave-validation="<?= FreshRSS_Context::$user_conf->archiving['keep_labels'] !== false ? 1 : 0 ?>"/>
+					<?= _t('conf.archiving.keep_labels') ?>
+				</label>
+			</div>
+		</div>
+
+		<div class="form-group">
+			<div class="group-controls">
+				<label class="checkbox" for="keep_unreads">
+					<input type="checkbox" name="keep_unreads" id="keep_unreads" value="1"<?= FreshRSS_Context::$user_conf->archiving['keep_unreads'] ? ' checked="checked"' : '' ?> data-leave-validation="<?= FreshRSS_Context::$user_conf->archiving['keep_unreads'] ? 1 : 0 ?>"/>
+					<?= _t('conf.archiving.keep_unreads') ?>
+				</label>
+			</div>
+		</div>
+
+		<div class="form-group">
+			<div class="group-controls">
+				<label for="keep_min_default"><?php echo _t('conf.archiving.keep_min_by_feed'); ?>
+					<input type="number" id="keep_min_default" name="keep_min_default" min="0" value="<?= FreshRSS_Context::$user_conf->archiving['keep_min'] ?>" data-leave-validation="<?= FreshRSS_Context::$user_conf->archiving['keep_min'] ?>">
+				</label>
+			</div>
+		</div>
+
 		<div class="form-group form-actions">
 			<div class="group-controls">
 				<button type="submit" class="btn btn-important"><?php echo _t('gen.action.submit'); ?></button>
@@ -55,9 +108,9 @@
 		</div>
 	</form>
 
-	<form method="post" action="<?php echo _url('entry', 'optimize'); ?>">
+	<legend><?php echo _t('conf.archiving.maintenance'); ?></legend>
+	<form method="post" action="<?php echo _url('entry', 'purge'); ?>">
 		<input type="hidden" name="_csrf" value="<?php echo FreshRSS_Auth::csrfToken(); ?>" />
-		<legend><?php echo _t('conf.archiving.advanced'); ?></legend>
 
 		<div class="form-group">
 			<label class="group-name"><?php echo _t('conf.user.current'); ?></label>
@@ -66,21 +119,30 @@
 			</div>
 		</div>
 
-		<?php if (FreshRSS_Auth::hasAccess('admin')) { ?>
 		<div class="form-group">
-			<label class="group-name"><?php echo _t('conf.user.users'); ?></label>
 			<div class="group-controls">
-				<?php echo format_bytes($this->size_total); ?>
+				<button type="submit" class="btn btn-important confirm"><?php echo _t('conf.archiving.purge_now'); ?></button>
 			</div>
 		</div>
+	</form>
 
-		<div class="form-group form-actions">
+	<form method="post" action="<?php echo _url('entry', 'optimize'); ?>">
+		<input type="hidden" name="_csrf" value="<?php echo FreshRSS_Auth::csrfToken(); ?>" />
+		<div class="form-group">
 			<div class="group-controls">
 				<input type="hidden" name="optimiseDatabase" value="1" />
 				<button type="submit" class="btn btn-important"><?php echo _t('conf.archiving.optimize'); ?></button>
 				<?php echo _i('help'); ?> <?php echo _t('conf.archiving.optimize_help'); ?>
 			</div>
 		</div>
-		<?php } ?>
 	</form>
+
+	<?php if (FreshRSS_Auth::hasAccess('admin')): ?>
+	<div class="form-group">
+		<label class="group-name"><?php echo _t('conf.user.users'); ?></label>
+		<div class="group-controls">
+			<?php echo format_bytes($this->size_total); ?>
+		</div>
+	</div>
+	<?php endif; ?>
 </div>
diff --git a/app/views/helpers/category/update.phtml b/app/views/helpers/category/update.phtml
index b64bd786a..31482f163 100644
--- a/app/views/helpers/category/update.phtml
+++ b/app/views/helpers/category/update.phtml
@@ -33,5 +33,121 @@
 				<?php endif;?>
 			</div>
 		</div>
+
+		<legend><?php echo _t('sub.category.archiving'); ?></legend>
+		<?php
+			$archiving = $this->category->attributes('archiving');
+			if (empty($archiving)) {
+				$archiving = [ 'default' => true ];
+			} else {
+				$archiving['default'] = false;
+			}
+			$volatile = [
+				'enable_keep_period' => false,
+				'keep_period_count' => '3',
+				'keep_period_unit' => 'P1M',
+			];
+			if (!empty($archiving['keep_period'])) {
+				if (preg_match('/^PT?(?P<count>\d+)[YMWDH]$/', $archiving['keep_period'], $matches)) {
+					$volatile['enable_keep_period'] = true;
+					$volatile['keep_period_count'] = $matches['count'];
+					$volatile['keep_period_unit'] = str_replace($matches['count'], '1', $archiving['keep_period']);
+				}
+			}
+			//Defaults
+			if (!isset($archiving['keep_max'])) {
+				$archiving['keep_max'] = false;
+			}
+			if (!isset($archiving['keep_favourites'])) {
+				$archiving['keep_favourites'] = true;
+			}
+			if (!isset($archiving['keep_labels'])) {
+				$archiving['keep_labels'] = true;
+			}
+			if (!isset($archiving['keep_unreads'])) {
+				$archiving['keep_unreads'] = false;
+			}
+			if (!isset($archiving['keep_min'])) {
+				$archiving['keep_min'] = 50;
+			}
+		?>
+
+		<p class="alert alert-warn">
+			<?= _t('conf.archiving.policy_warning') ?>
+		</p>
+
+		<div class="form-group">
+			<label class="group-name"><?= _t('conf.archiving.policy') ?></label>
+			<div class="group-controls">
+				<label class="checkbox">
+					<input type="checkbox" name="use_default_purge_options" id="use_default_purge_options" value="1"<?= $archiving['default'] ? ' checked="checked"' : '' ?> data-leave-validation="<?= $archiving['default'] ? 1 : 0 ?>" />
+					<?= _t('gen.short.by_default') ?>
+				</label>
+			</div>
+		</div>
+		<div class="form-group archiving"<?= $archiving['default'] ? ' hidden="hidden"' : '' ?>>
+			<div class="group-controls">
+				<label class="checkbox" for="enable_keep_max">
+					<input type="checkbox" name="enable_keep_max" id="enable_keep_max" value="1"<?= empty($archiving['keep_max']) ? '' : ' checked="checked"' ?> data-leave-validation="<?= empty($archiving['keep_max']) ? 0 : 1 ?>"/>
+					<?= _t('conf.archiving.keep_max') ?>
+					<input type="number" id="keep_max" name="keep_max" min="0" value="<?= empty($archiving['keep_max']) ? 200 : $archiving['keep_max'] ?>" data-leave-validation="<?= empty($archiving['keep_max']) ? 200 : $archiving['keep_max'] ?>"/>
+				</label>
+			</div>
+		</div>
+		<div class="form-group archiving"<?= $archiving['default'] ? ' hidden="hidden"' : '' ?>>
+			<div class="group-controls">
+				<label class="checkbox" for="enable_keep_period">
+					<input type="checkbox" name="enable_keep_period" id="enable_keep_period" value="1"<?= $volatile['enable_keep_period'] ? ' checked="checked"' : '' ?> data-leave-validation="<?= $volatile['enable_keep_period'] ? 1 : 0 ?>"/>
+					<?= _t('conf.archiving.keep_period') ?>
+					<input type="number" id="keep_period_count" name="keep_period_count" min="0" value="<?= $volatile['keep_period_count'] ?>" data-leave-validation="<?= $volatile['keep_period_count'] ?>"/>
+					<select class="number" name="keep_period_unit" id="keep_period_unit" data-leave-validation="<?= $volatile['keep_period_unit'] ?>">
+						<option></option>
+						<option value="P1Y" <?= 'P1Y' === $volatile['keep_period_unit'] ? 'selected="selected"' : '' ?>><?= _t('gen.period.years') ?></option>
+						<option value="P1M" <?= 'P1M' === $volatile['keep_period_unit'] ? 'selected="selected"' : '' ?>><?= _t('gen.period.months') ?></option>
+						<option value="P1W" <?= 'P1W' === $volatile['keep_period_unit'] ? 'selected="selected"' : '' ?>><?= _t('gen.period.weeks') ?></option>
+						<option value="P1D" <?= 'P1D' === $volatile['keep_period_unit'] ? 'selected="selected"' : '' ?>><?= _t('gen.period.days') ?></option>
+						<option value="PT1H" <?= 'PT1H' === $volatile['keep_period_unit'] ? 'selected="selected"' : '' ?>><?= _t('gen.period.hours') ?></option>
+					</select>
+				</label>
+			</div>
+		</div>
+		<div class="form-group archiving"<?= $archiving['default'] ? ' hidden="hidden"' : '' ?>>
+			<label class="group-name"><?= _t('conf.archiving.exception') ?></label>
+			<div class="group-controls">
+				<label class="checkbox" for="keep_favourites">
+					<input type="checkbox" name="keep_favourites" id="keep_favourites" value="1"<?= $archiving['keep_favourites'] ? ' checked="checked"' : '' ?> data-leave-validation="<?= $archiving['keep_favourites'] ? 1 : 0 ?>"/>
+					<?= _t('conf.archiving.keep_favourites') ?>
+				</label>
+			</div>
+		</div>
+		<div class="form-group archiving"<?= $archiving['default'] ? ' hidden="hidden"' : '' ?>>
+			<div class="group-controls">
+				<label class="checkbox" for="keep_labels">
+					<input type="checkbox" name="keep_labels" id="keep_labels" value="1"<?= $archiving['keep_labels'] ? ' checked="checked"' : '' ?> data-leave-validation="<?= $archiving['keep_labels'] ? 1 : 0 ?>"/>
+					<?= _t('conf.archiving.keep_labels') ?>
+				</label>
+			</div>
+		</div>
+		<div class="form-group archiving"<?= $archiving['default'] ? ' hidden="hidden"' : '' ?>>
+			<div class="group-controls">
+				<label class="checkbox" for="keep_unreads">
+					<input type="checkbox" name="keep_unreads" id="keep_unreads" value="1"<?= $archiving['keep_unreads'] ? ' checked="checked"' : '' ?> data-leave-validation="<?= $archiving['keep_unreads'] ? 1 : 0 ?>"/>
+					<?= _t('conf.archiving.keep_unreads') ?>
+				</label>
+			</div>
+		</div>
+		<div class="form-group archiving"<?= $archiving['default'] ? ' hidden="hidden"' : '' ?>>
+			<div class="group-controls">
+				<label for="keep_min"><?php echo _t('sub.feed.keep_min'); ?>
+					<input type="number" id="keep_min" name="keep_min" min="0" value="<?= $archiving['keep_min'] ?>" data-leave-validation="<?= $archiving['keep_min'] ?>">
+				</label>
+			</div>
+		</div>
+		<div class="form-group form-actions">
+			<div class="group-controls">
+				<button class="btn btn-important"><?= _t('gen.action.submit') ?></button>
+				<button type="reset" class="btn"><?= _t('gen.action.cancel') ?></button>
+			</div>
+		</div>
 	</form>
 </div>
diff --git a/app/views/helpers/feed/update.phtml b/app/views/helpers/feed/update.phtml
index 620806d7b..84461ed03 100644
--- a/app/views/helpers/feed/update.phtml
+++ b/app/views/helpers/feed/update.phtml
@@ -78,6 +78,7 @@
 		<div class="form-group form-actions">
 			<div class="group-controls">
 				<button class="btn btn-important"><?php echo _t('gen.action.submit'); ?></button>
+				<button type="reset" class="btn"><?php echo _t('gen.action.cancel'); ?></button>
 				<button class="btn btn-attention confirm"
 				        data-str-confirm="<?php echo _t('gen.js.confirm_action_feed_cat'); ?>"
 				        formaction="<?php echo _url('feed', 'delete', 'id', $this->feed->id()); ?>"
@@ -97,16 +98,115 @@
 				</div>
 			</div>
 		</div>
+		<?php
+			$archiving = $this->feed->attributes('archiving');
+			if (empty($archiving)) {
+				$archiving = [ 'default' => true ];
+			} else {
+				$archiving['default'] = false;
+			}
+			$volatile = [
+				'enable_keep_period' => false,
+				'keep_period_count' => '3',
+				'keep_period_unit' => 'P1M',
+			];
+			if (!empty($archiving['keep_period'])) {
+				if (preg_match('/^PT?(?P<count>\d+)[YMWDH]$/', $archiving['keep_period'], $matches)) {
+					$volatile['enable_keep_period'] = true;
+					$volatile['keep_period_count'] = $matches['count'];
+					$volatile['keep_period_unit'] = str_replace($matches['count'], '1', $archiving['keep_period']);
+				}
+			}
+			//Defaults
+			if (!isset($archiving['keep_max'])) {
+				$archiving['keep_max'] = false;
+			}
+			if (!isset($archiving['keep_min'])) {
+				$archiving['keep_min'] = 50;
+			}
+			if (!isset($archiving['keep_favourites'])) {
+				$archiving['keep_favourites'] = true;
+			}
+			if (!isset($archiving['keep_labels'])) {
+				$archiving['keep_labels'] = true;
+			}
+			if (!isset($archiving['keep_unreads'])) {
+				$archiving['keep_unreads'] = false;
+			}
+		?>
+
+		<p class="alert alert-warn">
+			<?= _t('conf.archiving.policy_warning') ?>
+		</p>
+
 		<div class="form-group">
-			<label class="group-name" for="keep_history"><?php echo _t('sub.feed.keep_history'); ?></label>
+			<label class="group-name"><?= _t('conf.archiving.policy') ?></label>
 			<div class="group-controls">
-				<select class="number" name="keep_history" id="keep_history" required="required"><?php
-					foreach (array('' => '', FreshRSS_Feed::KEEP_HISTORY_DEFAULT => _t('gen.short.by_default'), 0 => '0', 10 => '10', 50 => '50', 100 => '100', 500 => '500', 1000 => '1 000', 5000 => '5 000', 10000 => '10 000', FreshRSS_Feed::KEEP_HISTORY_INFINITE => '∞') as $v => $t) {
-						echo '<option value="' . $v . ($this->feed->keepHistory() === $v ? '" selected="selected' : '') . '">' . $t . '</option>';
-					}
-				?></select>
+				<label class="checkbox">
+					<input type="checkbox" name="use_default_purge_options" id="use_default_purge_options" value="1"<?= $archiving['default'] ? ' checked="checked"' : '' ?> data-leave-validation="<?= $archiving['default'] ? 1 : 0 ?>" />
+					<?= _t('gen.short.by_default') ?>
+				</label>
 			</div>
 		</div>
+		<div class="form-group archiving"<?= $archiving['default'] ? ' hidden="hidden"' : '' ?>>
+			<div class="group-controls">
+				<label class="checkbox" for="enable_keep_max">
+					<input type="checkbox" name="enable_keep_max" id="enable_keep_max" value="1"<?= empty($archiving['keep_max']) ? '' : ' checked="checked"' ?> data-leave-validation="<?= empty($archiving['keep_max']) ? 0 : 1 ?>"/>
+					<?= _t('conf.archiving.keep_max') ?>
+					<input type="number" id="keep_max" name="keep_max" min="0" value="<?= empty($archiving['keep_max']) ? 200 : $archiving['keep_max'] ?>" data-leave-validation="<?= empty($archiving['keep_max']) ? 200 : $archiving['keep_max'] ?>"/>
+				</label>
+			</div>
+		</div>
+		<div class="form-group archiving"<?= $archiving['default'] ? ' hidden="hidden"' : '' ?>>
+			<div class="group-controls">
+				<label class="checkbox" for="enable_keep_period">
+					<input type="checkbox" name="enable_keep_period" id="enable_keep_period" value="1"<?= $volatile['enable_keep_period'] ? ' checked="checked"' : '' ?> data-leave-validation="<?= $volatile['enable_keep_period'] ? 1 : 0 ?>"/>
+					<?= _t('conf.archiving.keep_period') ?>
+					<input type="number" id="keep_period_count" name="keep_period_count" min="0" value="<?= $volatile['keep_period_count'] ?>" data-leave-validation="<?= $volatile['keep_period_count'] ?>"/>
+					<select class="number" name="keep_period_unit" id="keep_period_unit" data-leave-validation="<?= $volatile['keep_period_unit'] ?>">
+						<option></option>
+						<option value="P1Y" <?= 'P1Y' === $volatile['keep_period_unit'] ? 'selected="selected"' : '' ?>><?= _t('gen.period.years') ?></option>
+						<option value="P1M" <?= 'P1M' === $volatile['keep_period_unit'] ? 'selected="selected"' : '' ?>><?= _t('gen.period.months') ?></option>
+						<option value="P1W" <?= 'P1W' === $volatile['keep_period_unit'] ? 'selected="selected"' : '' ?>><?= _t('gen.period.weeks') ?></option>
+						<option value="P1D" <?= 'P1D' === $volatile['keep_period_unit'] ? 'selected="selected"' : '' ?>><?= _t('gen.period.days') ?></option>
+						<option value="PT1H" <?= 'PT1H' === $volatile['keep_period_unit'] ? 'selected="selected"' : '' ?>><?= _t('gen.period.hours') ?></option>
+					</select>
+				</label>
+			</div>
+		</div>
+		<div class="form-group archiving"<?= $archiving['default'] ? ' hidden="hidden"' : '' ?>>
+			<label class="group-name"><?= _t('conf.archiving.exception') ?></label>
+			<div class="group-controls">
+				<label class="checkbox" for="keep_favourites">
+					<input type="checkbox" name="keep_favourites" id="keep_favourites" value="1"<?= $archiving['keep_favourites'] ? ' checked="checked"' : '' ?> data-leave-validation="<?= $archiving['keep_favourites'] ? 1 : 0 ?>"/>
+					<?= _t('conf.archiving.keep_favourites') ?>
+				</label>
+			</div>
+		</div>
+		<div class="form-group archiving"<?= $archiving['default'] ? ' hidden="hidden"' : '' ?>>
+			<div class="group-controls">
+				<label class="checkbox" for="keep_labels">
+					<input type="checkbox" name="keep_labels" id="keep_labels" value="1"<?= $archiving['keep_labels'] ? ' checked="checked"' : '' ?> data-leave-validation="<?= $archiving['keep_labels'] ? 1 : 0 ?>"/>
+					<?= _t('conf.archiving.keep_labels') ?>
+				</label>
+			</div>
+		</div>
+		<div class="form-group archiving"<?= $archiving['default'] ? ' hidden="hidden"' : '' ?>>
+			<div class="group-controls">
+				<label class="checkbox" for="keep_unreads">
+					<input type="checkbox" name="keep_unreads" id="keep_unreads" value="1"<?= $archiving['keep_unreads'] ? ' checked="checked"' : '' ?> data-leave-validation="<?= $archiving['keep_unreads'] ?>"/>
+					<?= _t('conf.archiving.keep_unreads') ?>
+				</label>
+			</div>
+		</div>
+		<div class="form-group archiving"<?= $archiving['default'] ? ' hidden="hidden"' : '' ?>>
+			<div class="group-controls">
+				<label for="keep_min"><?php echo _t('sub.feed.keep_min'); ?>
+					<input type="number" id="keep_min" name="keep_min" min="0" value="<?= $archiving['keep_min'] ?>" data-leave-validation="<?= $archiving['keep_min'] ?>">
+				</label>
+			</div>
+		</div>
+
 		<div class="form-group">
 			<label class="group-name" for="ttl"><?php echo _t('sub.feed.ttl'); ?></label>
 			<div class="group-controls">
@@ -143,6 +243,7 @@
 		<div class="form-group form-actions">
 			<div class="group-controls">
 				<button class="btn btn-important"><?php echo _t('gen.action.submit'); ?></button>
+				<button type="reset" class="btn"><?php echo _t('gen.action.cancel'); ?></button>
 				<button class="btn btn-attention confirm" formmethod="post" formaction="<?php echo _url('feed', 'truncate', 'id', $this->feed->id()); ?>"><?php echo _t('gen.action.truncate'); ?></button>
 			</div>
 		</div>