diff --git a/classes/db.php b/classes/db.php
index 6199c82bb..490cecd57 100755
--- a/classes/db.php
+++ b/classes/db.php
@@ -1,13 +1,9 @@
 <?php
 class Db
 {
-
 	/* @var Db $instance */
 	private static $instance;
 
-	/* @var IDb $adapter */
-	private $adapter;
-
 	private $link;
 
 	/* @var PDO $pdo */
@@ -17,38 +13,6 @@ class Db
 		//
 	}
 
-	private function legacy_connect() {
-
-		user_error("Legacy connect requested to " . DB_TYPE, E_USER_NOTICE);
-
-		$er = error_reporting(E_ALL);
-
-		switch (DB_TYPE) {
-			case "mysql":
-				$this->adapter = new Db_Mysqli();
-				break;
-			case "pgsql":
-				$this->adapter = new Db_Pgsql();
-				break;
-			default:
-				die("Unknown DB_TYPE: " . DB_TYPE);
-		}
-
-		if (!$this->adapter) {
-			print("Error initializing database adapter for " . DB_TYPE);
-			exit(100);
-		}
-
-		$this->link = $this->adapter->connect(DB_HOST, DB_USER, DB_PASS, DB_NAME, defined('DB_PORT') ? DB_PORT : "");
-
-		if (!$this->link) {
-			print("Error connecting through adapter: " . $this->adapter->last_error());
-			exit(101);
-		}
-
-		error_reporting($er);
-	}
-
 	// this really shouldn't be used unless a separate PDO connection is needed
 	// normal usage is Db::pdo()->prepare(...) etc
 	public function pdo_connect() {
@@ -92,17 +56,6 @@ class Db
 		return self::$instance;
 	}
 
-	public static function get() : Db {
-		if (self::$instance == null)
-			self::$instance = new self();
-
-		if (!self::$instance->adapter) {
-			self::$instance->legacy_connect();
-		}
-
-		return self::$instance->adapter;
-	}
-
 	public static function pdo() : PDO {
 		if (self::$instance == null)
 			self::$instance = new self();
diff --git a/classes/db/mysqli.php b/classes/db/mysqli.php
deleted file mode 100644
index a05b121fc..000000000
--- a/classes/db/mysqli.php
+++ /dev/null
@@ -1,85 +0,0 @@
-<?php
-class Db_Mysqli implements IDb {
-	private $link;
-	private $last_error;
-
-	function connect($host, $user, $pass, $db, $port) {
-		if ($port)
-			$this->link = mysqli_connect($host, $user, $pass, $db, $port);
-		else
-			$this->link = mysqli_connect($host, $user, $pass, $db);
-
-		if ($this->link) {
-			$this->init();
-
-			return $this->link;
-		} else {
-			print("Unable to connect to database (as $user to $host, database $db): " . mysqli_connect_error());
-			exit(102);
-		}
-	}
-
-	function escape_string($s, $strip_tags = true) {
-		if ($strip_tags) $s = strip_tags($s);
-
-		return mysqli_real_escape_string($this->link, $s);
-	}
-
-	function query($query, $die_on_error = true) {
-		$result = @mysqli_query($this->link, $query);
-		if (!$result) {
-			$this->last_error = @mysqli_error($this->link);
-
-			@mysqli_query($this->link, "ROLLBACK");
-			user_error("Query $query failed: " . ($this->link ? $this->last_error : "No connection"),
-				$die_on_error ? E_USER_ERROR : E_USER_WARNING);
-		}
-
-		return $result;
-	}
-
-	function fetch_assoc($result) {
-		return mysqli_fetch_assoc($result);
-	}
-
-
-	function num_rows($result) {
-		return mysqli_num_rows($result);
-	}
-
-	function fetch_result($result, $row, $param) {
-		if (mysqli_data_seek($result, $row)) {
-			$line = mysqli_fetch_assoc($result);
-			return $line[$param];
-		} else {
-			return false;
-		}
-	}
-
-	function close() {
-		return mysqli_close($this->link);
-	}
-
-	function affected_rows($result) {
-		return mysqli_affected_rows($this->link);
-	}
-
-	function last_error() {
-		return mysqli_error($this->link);
-	}
-
-	function last_query_error() {
-		return $this->last_error;
-	}
-
-	function init() {
-		$this->query("SET time_zone = '+0:0'");
-
-		if (defined('MYSQL_CHARSET') && MYSQL_CHARSET) {
-			mysqli_set_charset($this->link, MYSQL_CHARSET);
-		}
-
-		return true;
-	}
-
-}
diff --git a/classes/db/pgsql.php b/classes/db/pgsql.php
deleted file mode 100644
index 98fab6bea..000000000
--- a/classes/db/pgsql.php
+++ /dev/null
@@ -1,91 +0,0 @@
-<?php
-class Db_Pgsql implements IDb {
-	private $link;
-	private $last_error;
-
-	function connect($host, $user, $pass, $db, $port) {
-		$string = "dbname=$db user=$user";
-
-		if ($pass) {
-			$string .= " password=$pass";
-		}
-
-		if ($host) {
-			$string .= " host=$host";
-		}
-
-		if (is_numeric($port) && $port > 0) {
-			$string = "$string port=" . $port;
-		}
-
-		$this->link = pg_connect($string);
-
-		if (!$this->link) {
-			print("Unable to connect to database (as $user to $host, database $db):" . pg_last_error());
-			exit(102);
-		}
-
-		$this->init();
-
-		return $this->link;
-	}
-
-	function escape_string($s, $strip_tags = true) {
-		if ($strip_tags) $s = strip_tags($s);
-
-		return pg_escape_string($s);
-	}
-
-	function query($query, $die_on_error = true) {
-		$result = @pg_query($this->link, $query);
-
-		if (!$result) {
-			$this->last_error = @pg_last_error($this->link);
-
-			@pg_query($this->link, "ROLLBACK");
-			$query = htmlspecialchars($query); // just in case
-			user_error("Query $query failed: " . ($this->link ? $this->last_error : "No connection"),
-				$die_on_error ? E_USER_ERROR : E_USER_WARNING);
-		}
-		return $result;
-	}
-
-	function fetch_assoc($result) {
-		return pg_fetch_assoc($result);
-	}
-
-
-	function num_rows($result) {
-		return pg_num_rows($result);
-	}
-
-	function fetch_result($result, $row, $param) {
-		return pg_fetch_result($result, $row, $param);
-	}
-
-	function close() {
-		return pg_close($this->link);
-	}
-
-	function affected_rows($result) {
-		return pg_affected_rows($result);
-	}
-
-	function last_error() {
-		return pg_last_error($this->link);
-	}
-
-	function last_query_error() {
-		return $this->last_error;
-	}
-
-	function init() {
-		$this->query("set client_encoding = 'UTF-8'");
-		pg_set_client_encoding("UNICODE");
-		$this->query("set datestyle = 'ISO, european'");
-		$this->query("set TIME ZONE 0");
-		$this->query("set cpu_tuple_cost = 0.5");
-
-		return true;
-	}
-}
\ No newline at end of file
diff --git a/classes/idb.php b/classes/idb.php
deleted file mode 100644
index 37fd69906..000000000
--- a/classes/idb.php
+++ /dev/null
@@ -1,13 +0,0 @@
-<?php
-interface IDb {
-	function connect($host, $user, $pass, $db, $port);
-	function escape_string($s, $strip_tags = true);
-	function query($query, $die_on_error = true);
-	function fetch_assoc($result);
-	function num_rows($result);
-	function fetch_result($result, $row, $param);
-	function close();
-	function affected_rows($result);
-	function last_error();
-	function last_query_error();
-}
diff --git a/include/sanity_check.php b/include/sanity_check.php
index c5ffb87ec..9407b606f 100755
--- a/include/sanity_check.php
+++ b/include/sanity_check.php
@@ -137,14 +137,6 @@
 				array_push($errors, "PHP support for JSON is required, but was not found.");
 			}
 
-			if (DB_TYPE == "mysql" && !function_exists("mysqli_connect")) {
-				array_push($errors, "PHP support for MySQL is required for configured DB_TYPE in config.php.");
-			}
-
-			if (DB_TYPE == "pgsql" && !function_exists("pg_connect")) {
-				array_push($errors, "PHP support for PostgreSQL is required for configured DB_TYPE in config.php");
-			}
-
 			if (!class_exists("PDO")) {
 				array_push($errors, "PHP support for PDO is required but was not found.");
 			}