Add new paradigm classes for notification and introduction notifications

- Add support for bounded select in BaseDepository

src/BaseDepository.php

@@ -5,6 +5,7 @@ namespace Friendica;
 use Exception;
 use Friendica\Capabilities\ICanCreateFromTableRow;
 use Friendica\Database\Database;
+use Friendica\Database\DBA;
 use Friendica\Network\HTTPException\NotFoundException;
 use Psr\Log\LoggerInterface;
 
@@ -43,6 +44,67 @@ abstract class BaseDepository
 		$this->factory = $factory;
 	}
 
+	/**
+	 * Populates the collection according to the condition. Retrieves a limited subset of entities depending on the
+	 * boundaries and the limit. The total count of rows matching the condition is stored in the collection.
+	 *
+	 * Depends on the corresponding table featuring a numerical auto incremented column called `id`.
+	 *
+	 * max_id and min_id are susceptible to the query order:
+	 * - min_id alone only reliably works with ASC order
+	 * - max_id alone only reliably works with DESC order
+	 * If the wrong order is detected in either case, we reverse the query order and the entity list order after the query
+	 *
+	 * Chainable.
+	 *
+	 * @param array    $condition
+	 * @param array    $params
+	 * @param int|null $min_id Retrieve models with an id no fewer than this, as close to it as possible
+	 * @param int|null $max_id Retrieve models with an id no greater than this, as close to it as possible
+	 * @param int      $limit
+	 * @return BaseCollection
+	 * @throws \Exception
+	 */
+	protected function _selectByBoundaries(
+		array $condition = [],
+		array $params = [],
+		int $min_id = null,
+		int $max_id = null,
+		int $limit = self::LIMIT
+	): BaseCollection {
+		$totalCount = $this->count($condition);
+
+		$boundCondition = $condition;
+
+		$reverseOrder = false;
+
+		if (isset($min_id)) {
+			$boundCondition = DBA::mergeConditions($boundCondition, ['`id` > ?', $min_id]);
+			if (!isset($max_id) && isset($params['order']['id']) && ($params['order']['id'] === true || $params['order']['id'] === 'DESC')) {
+				$reverseOrder = true;
+
+				$params['order']['id'] = 'ASC';
+			}
+		}
+
+		if (isset($max_id)) {
+			$boundCondition = DBA::mergeConditions($boundCondition, ['`id` < ?', $max_id]);
+			if (!isset($min_id) && (!isset($params['order']['id']) || $params['order']['id'] === false || $params['order']['id'] === 'ASC')) {
+				$reverseOrder = true;
+
+				$params['order']['id'] = 'DESC';
+			}
+		}
+
+		$params['limit'] = $limit;
+
+		$Entities = $this->_select($boundCondition, $params);
+		if ($reverseOrder) {
+			$Entities->reverse();
+		}
+
+		return new BaseCollection($Entities->getArrayCopy(), $totalCount);
+	}
 
 	/**
 	 * @param array $condition