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diff --git a/controller/PostgreSQL.hpp b/controller/PostgreSQL.hpp
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+/*
+ * ZeroTier One - Network Virtualization Everywhere
+ * Copyright (C) 2011-2019  ZeroTier, Inc.  https://www.zerotier.com/
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * --
+ *
+ * You can be released from the requirements of the license by purchasing
+ * a commercial license. Buying such a license is mandatory as soon as you
+ * develop commercial closed-source software that incorporates or links
+ * directly against ZeroTier software without disclosing the source code
+ * of your own application.
+ */
+ 
+#ifdef ZT_CONTROLLER_USE_LIBPQ
+
+#ifndef ZT_CONTROLLER_LIBPQ_HPP
+#define ZT_CONTROLLER_LIBPQ_HPP
+
+#include "DB.hpp"
+
+#define ZT_CENTRAL_CONTROLLER_COMMIT_THREADS 4
+
+extern "C" {
+    typedef struct pg_conn PGconn;
+}
+
+namespace ZeroTier
+{
+
+struct MQConfig;
+
+/**
+ * A controller database driver that talks to PostgreSQL
+ *
+ * This is for use with ZeroTier Central.  Others are free to build and use it
+ * but be aware taht we might change it at any time.
+ */
+class PostgreSQL : public DB
+{
+public:
+    PostgreSQL(const Identity &myId, const char *path, int listenPort, MQConfig *mqc = NULL);
+    virtual ~PostgreSQL();
+
+    virtual bool waitForReady();
+    virtual bool isReady();
+    virtual void save(nlohmann::json *orig, nlohmann::json &record);
+    virtual void eraseNetwork(const uint64_t networkId);
+    virtual void eraseMember(const uint64_t networkId, const uint64_t memberId);
+    virtual void nodeIsOnline(const uint64_t networkId, const uint64_t memberId, const InetAddress &physicalAddress);
+
+protected:
+    struct _PairHasher
+	{
+		inline std::size_t operator()(const std::pair<uint64_t,uint64_t> &p) const { return (std::size_t)(p.first ^ p.second); }
+	};
+
+private:
+    void initializeNetworks(PGconn *conn);
+    void initializeMembers(PGconn *conn);
+    void heartbeat();
+    void membersDbWatcher();
+    void _membersWatcher_Postgres(PGconn *conn);
+    void _membersWatcher_RabbitMQ();
+    void networksDbWatcher();
+    void _networksWatcher_Postgres(PGconn *conn);
+    void _networksWatcher_RabbitMQ();
+
+    void commitThread();
+    void onlineNotificationThread();
+
+    enum OverrideMode {
+        ALLOW_PGBOUNCER_OVERRIDE = 0,
+        NO_OVERRIDE = 1
+    };
+
+    PGconn * getPgConn( OverrideMode m = ALLOW_PGBOUNCER_OVERRIDE );
+
+    std::string _connString;
+
+    BlockingQueue<nlohmann::json *> _commitQueue;
+
+    std::thread _heartbeatThread;
+    std::thread _membersDbWatcher;
+    std::thread _networksDbWatcher;
+    std::thread _commitThread[ZT_CENTRAL_CONTROLLER_COMMIT_THREADS];
+    std::thread _onlineNotificationThread;
+
+	std::unordered_map< std::pair<uint64_t,uint64_t>,std::pair<int64_t,InetAddress>,_PairHasher > _lastOnline;
+
+    mutable std::mutex _lastOnline_l;
+    mutable std::mutex _readyLock;
+    std::atomic<int> _ready, _connected, _run;
+    mutable volatile bool _waitNoticePrinted;
+
+    int _listenPort;
+
+    MQConfig *_mqc;
+};
+
+}
+
+#endif // ZT_CONTROLLER_LIBPQ_HPP
+
+#endif // ZT_CONTROLLER_USE_LIBPQ