diff --git a/inc/Data/ReportQueries.php b/inc/Data/ReportQueries.php
new file mode 100644
index 00000000..3c58d945
--- /dev/null
+++ b/inc/Data/ReportQueries.php
@@ -0,0 +1,243 @@
+<?php
+namespace Vichan\Data;
+
+use Vichan\Data\Driver\CacheDriver;
+
+
+class ReportQueries {
+	private const CACHE_KEY = "report_queries_valid_count";
+
+	private \PDO $pdo;
+	private CacheDriver $cache;
+	private bool $auto_maintenance;
+
+
+	private function deleteReportImpl(string $board, int $post_id) {
+		$query = prepare("DELETE FROM ``reports`` WHERE `post` = :id AND `board` = :board");
+		$query->bindValue(':id', $post_id, \PDO::PARAM_INT);
+		$query->bindValue(':board', $board);
+		$query->execute();
+	}
+
+	private function joinReportPosts(array $raw_reports, ?int $limit): array {
+		// Group the reports rows by board.
+		$reports_by_boards = [];
+		foreach ($raw_reports as $report) {
+			if (!isset($reports_by_boards[$report['board']])) {
+				$reports_by_boards[$report['board']] = [];
+			}
+			$reports_by_boards[$report['board']][] = $report['post'];
+		}
+
+		// Join the reports with the actual posts.
+		$report_posts = [];
+		foreach ($reports_by_boards as $board => $posts) {
+			$report_posts[$board] = [];
+
+			$query = $this->pdo->prepare(\sprintf('SELECT * FROM `posts_%s` WHERE `id` IN (' . \implode(',', $posts) . ')', $board));
+			$query->execute();
+			while ($post = $query->fetch(\PDO::FETCH_ASSOC)) {
+				$report_posts[$board][$post['id']] = $post;
+			}
+		}
+
+		// Filter out the reports without a valid post.
+		$valid = [];
+		foreach ($raw_reports as $report) {
+			if (isset($report_posts[$report['board']][$report['post']])) {
+				$report['post_data'] = $report_posts[$report['board']][$report['post']];
+				$valid[] = $report;
+
+				if ($limit !== null && \count($valid) >= $limit) {
+					return $valid;
+				}
+			} else {
+				// Invalid report (post has been deleted).
+				if ($this->auto_maintenance != false) {
+					$this->deleteReportImpl($report['board'], $report['post']);
+				}
+			}
+		}
+		return $valid;
+	}
+
+	/**
+	 * Filters out the invalid reports.
+	 *
+	 * @param array $raw_reports Array with the raw fetched reports. Must include a `board`, `post` and `id` fields.
+	 * @param bool $get_invalid True to reverse the filter and get the invalid reports instead.
+	 * @return array An array of filtered reports.
+	 */
+	private function filterReports(array $raw_reports, bool $get_invalid): array {
+		// Group the reports rows by board.
+		$reports_by_boards = [];
+		foreach ($raw_reports as $report) {
+			if (!isset($reports_by_boards[$report['board']])) {
+				$reports_by_boards[$report['board']] = [];
+			}
+			$reports_by_boards[$report['board']][] = $report['post'];
+		}
+
+		// Join the reports with the actual posts.
+		$report_posts = [];
+		foreach ($reports_by_boards as $board => $posts) {
+			$report_posts[$board] = [];
+
+			$query = $this->pdo->prepare(\sprintf('SELECT `id` FROM `posts_%s` WHERE `id` IN (' . \implode(',', $posts) . ')', $board));
+			$query->execute();
+			while ($post = $query->fetch(\PDO::FETCH_ASSOC)) {
+				$report_posts[$board][$post['id']] = $post;
+			}
+		}
+
+		if ($get_invalid) {
+			// Get the reports without a post.
+			$invalid = [];
+			if (isset($report_posts[$report['board']][$report['post']])) {
+				$invalid[] = $report;
+			}
+			return $invalid;
+		} else {
+			// Filter out the reports without a valid post.
+			$valid = [];
+			foreach ($raw_reports as $report) {
+				if (isset($report_posts[$report['board']][$report['post']])) {
+					$valid[] = $report;
+				} else {
+					// Invalid report (post has been deleted).
+					if ($this->auto_maintenance != false) {
+						$this->deleteReportImpl($report['board'], $report['post']);
+					}
+				}
+			}
+			return $valid;
+		}
+	}
+
+	/**
+	 * @param \PDO $pdo PDO connection.
+	 * @param CacheDriver $cache Cache driver.
+	 * @param bool $auto_maintenance If the auto maintenance should be enabled.
+	 */
+	public function __construct(\PDO $pdo, CacheDriver $cache, bool $auto_maintenance) {
+		$this->pdo = $pdo;
+		$this->cache = $cache;
+		$this->auto_maintenance = $auto_maintenance;
+	}
+
+	/**
+	 * Get the number of reports.
+	 *
+	 * @return int The number of reports.
+	 */
+	public function getCount(): int {
+		$ret = $this->cache->get(self::CACHE_KEY);
+		if ($ret === null) {
+			$query = $this->pdo->prepare("SELECT `board`, `post`, `id` FROM `reports`");
+			$query->execute();
+			$raw_reports = $query->fetchAll(\PDO::FETCH_ASSOC);
+			$valid_reports = $this->filterReports($raw_reports, false, null);
+			$count = \count($valid_reports);
+
+			$this->cache->set(self::CACHE_KEY, $count);
+			return $count;
+		}
+		return $ret;
+	}
+
+	/**
+	 * Get the report with the given id. DOES NOT PERFORM VALIDITY CHECK.
+	 *
+	 * @param int $id The id of the report to fetch.
+	 * @return ?array An array of the given report with the `board` and `ip` fields. Null if no such report exists.
+	 */
+	public function getReportById(int $id): array {
+		$query = prepare("SELECT `board`, `ip` FROM ``reports`` WHERE `id` = :id");
+		$query->bindValue(':id', $id);
+		$query->execute();
+
+		$ret = $query->fetch(\PDO::FETCH_ASSOC);
+		if ($ret !== false) {
+			return $ret;
+		} else {
+			return null;
+		}
+	}
+
+	/**
+	 * Get the reports with the associated post data.
+	 *
+	 * @param int $count The maximum number of rows in the return array.
+	 * @return array The reports with the associated post data.
+	 */
+	public function getReportsWithPosts(int $count): array {
+		$query = $this->pdo->prepare("SELECT * FROM `reports` ORDER BY `time`");
+		$query->execute();
+		$raw_reports = $query->fetchAll(\PDO::FETCH_ASSOC);
+		return $this->joinReportPosts($raw_reports, $count);
+	}
+
+	/**
+	 * Purge the invalid reports.
+	 *
+	 * @return int The number of reports deleted.
+	 */
+	public function purge(): int {
+		$query = $this->pdo->prepare("SELECT `board`, `post`, `id` FROM `reports`");
+		$query->execute();
+		$raw_reports = $query->fetchAll(\PDO::FETCH_ASSOC);
+		$invalid_reports = $this->filterReports($raw_reports, true, null);
+
+		foreach ($invalid_reports as $report) {
+			$this->deleteReportImpl($report['board'], $report['post']);
+		}
+		return \count($invalid_reports);
+	}
+
+	/**
+	 * Deletes the given report.
+	 *
+	 * @param int $id The report id.
+	 */
+	public function deleteById(int $id) {
+		// The caller may actually delete a valid post, so we need to invalidate the cache.
+		$this->cache->delete(self::CACHE_KEY);
+		$query = $this->pdo->prepare("DELETE FROM `reports` WHERE `id` = :id");
+		$query->bindValue(':id', $id, \PDO::PARAM_INT);
+		$query->execute();
+	}
+
+	/**
+	 * Deletes all reports from the given ip.
+	 *
+	 * @param int $ip The reporter ip.
+	 */
+	public function deleteByIp(string $ip) {
+		// The caller may actually delete a valid post, so we need to invalidate the cache.
+		$this->cache->delete(self::CACHE_KEY);
+		$query = $this->pdo->prepare("DELETE FROM `reports` WHERE `ip` = :ip");
+		$query->bindValue(':ip', $ip);
+		$query->execute();
+	}
+
+	/**
+	 * Inserts a new report.
+	 *
+	 * @param string $ip Ip of the user sending the report.
+	 * @param string $board_uri Board uri of the reported thread. MUST ALREADY BE SANITIZED.
+	 * @param int $post_id Post reported.
+	 * @param string $reason Reason of the report.
+	 * @return void
+	 */
+	public function add(string $ip, string $board_uri, int $post_id, string $reason) {
+		$query = $this->pdo->prepare('INSERT INTO `reports` VALUES (NULL, :time, :ip, :board, :post, :reason)');
+		$query->bindValue(':time', time(), \PDO::PARAM_INT);
+		$query->bindValue(':ip', $ip);
+		$query->bindValue(':board', $board_uri);
+		$query->bindValue(':post', $post_id, \PDO::PARAM_INT);
+		$query->bindValue(':reason', $reason);
+		$query->execute();
+
+		$this->cache->delete(self::CACHE_KEY);
+	}
+}