diff --git a/lib/plugins.js b/lib/plugins.js
index 777aa351..98fc6fc8 100644
--- a/lib/plugins.js
+++ b/lib/plugins.js
@@ -4,7 +4,8 @@ const BigNumber = require('bignumber.js')
 const argv = require('minimist')(process.argv.slice(2))
 const crypto = require('crypto')
 
-const db = require('./postgresql_interface')
+const dbm = require('./postgresql_interface')
+const db = require('./db')
 const logger = require('./logger')
 const notifier = require('./notifier')
 const T = require('./time')
@@ -30,9 +31,11 @@ const SWEEP_LIVE_HD_INTERVAL = T.minute
 const SWEEP_OLD_HD_INTERVAL = 2 * T.minutes
 const TRADE_INTERVAL = 10 * T.seconds
 const TRADE_TTL = 2 * T.minutes
-const STALE_TICKER = 3 * 60 * 1000
-const STALE_BALANCE = 3 * 60 * 1000
-
+const STALE_TICKER = 3 * T.minutes
+const STALE_BALANCE = 3 * T.minutes
+const PONG_INTERVAL = 10 * T.seconds
+const PONG_CLEAR_INTERVAL = 1 * T.day
+const PONG_TTL = '1 week'
 const tradesQueues = {}
 
 const coins = {
@@ -113,7 +116,7 @@ function pollQueries (deviceTime, deviceId, deviceRec) {
   const balancePromises = cryptoCodes.map(wallet.balance)
   const pingPromise = recordPing(deviceId, deviceTime, deviceRec)
 
-  const promises = [db.cartridgeCounts(deviceId), pingPromise].concat(tickerPromises, balancePromises)
+  const promises = [dbm.cartridgeCounts(deviceId), pingPromise].concat(tickerPromises, balancePromises)
 
   return Promise.all(promises)
   .then(arr => {
@@ -130,15 +133,15 @@ function pollQueries (deviceTime, deviceId, deviceRec) {
 }
 
 // NOTE: This will fail if we have already sent coins because there will be
-// a db unique db record in the table already.
+// a dbm unique dbm record in the table already.
 function executeTx (deviceId, tx) {
-  return db.addOutgoingTx(deviceId, tx)
+  return dbm.addOutgoingTx(deviceId, tx)
   .then(() => wallet.sendCoins(tx.toAddress, tx.cryptoAtoms, tx.cryptoCode))
   .then(txHash => {
     const fee = null // Need to fill this out in plugins
     const toSend = {cryptoAtoms: tx.cryptoAtoms, fiat: tx.fiat}
 
-    return db.sentCoins(tx, toSend, fee, null, txHash)
+    return dbm.sentCoins(tx, toSend, fee, null, txHash)
     .then(() => ({
       statusCode: 201, // Created
       txHash,
@@ -148,13 +151,13 @@ function executeTx (deviceId, tx) {
 }
 
 function trade (deviceId, rawTrade) {
-  // TODO: move this to DB, too
+  // TODO: move this to dbm, too
   // add bill to trader queue (if trader is enabled)
   const cryptoCode = rawTrade.cryptoCode
   const fiatCode = rawTrade.fiatCode
   const cryptoAtoms = rawTrade.cryptoAtoms
 
-  return db.recordBill(deviceId, rawTrade)
+  return dbm.recordBill(deviceId, rawTrade)
   .then(() => {
     const market = [fiatCode, cryptoCode].join('')
 
@@ -177,7 +180,7 @@ function stateChange (deviceId, deviceTime, rec) {
     note: JSON.stringify({state: rec.state, isIdle: rec.isIdle, txId: rec.txId}),
     deviceTime: deviceTime
   }
-  return db.machineEvent(event)
+  return dbm.machineEvent(event)
 }
 
 function recordPing (deviceId, deviceTime, rec) {
@@ -188,7 +191,7 @@ function recordPing (deviceId, deviceTime, rec) {
     note: JSON.stringify({state: rec.state, isIdle: rec.idle === 'true', txId: rec.txId}),
     deviceTime: deviceTime
   }
-  return db.machineEvent(event)
+  return dbm.machineEvent(event)
 }
 
 function sendCoins (deviceId, rawTx) {
@@ -199,7 +202,7 @@ function cashOut (deviceId, tx) {
   const cryptoCode = tx.cryptoCode
 
   const serialPromise = wallet.supportsHD
-  ? db.nextCashOutSerialHD(tx.id, cryptoCode)
+  ? dbm.nextCashOutSerialHD(tx.id, cryptoCode)
   : Promise.resolve()
 
   return serialPromise
@@ -214,7 +217,7 @@ function cashOut (deviceId, tx) {
     .then(address => {
       const newTx = R.assoc('toAddress', address, tx)
 
-      return db.addInitialIncoming(deviceId, newTx, address)
+      return dbm.addInitialIncoming(deviceId, newTx, address)
       .then(() => address)
     })
   })
@@ -226,7 +229,7 @@ function dispenseAck (deviceId, tx) {
   const cartridges = [ config.currencies.topCashOutDenomination,
     config.currencies.bottomCashOutDenomination ]
 
-  return db.addDispense(deviceId, tx, cartridges)
+  return dbm.addDispense(deviceId, tx, cartridges)
 }
 
 function fiatBalance (fiatCode, cryptoCode, deviceId) {
@@ -257,7 +260,7 @@ function fiatBalance (fiatCode, cryptoCode, deviceId) {
 
 function processTxStatus (tx) {
   return wallet.getStatus(tx.toAddress, tx.cryptoAtoms, tx.cryptoCode)
-  .then(res => db.updateTxStatus(tx, res.status))
+  .then(res => dbm.updateTxStatus(tx, res.status))
 }
 
 function notifyConfirmation (tx) {
@@ -272,13 +275,13 @@ function notifyConfirmation (tx) {
   }
 
   return sms.sendMessage(rec)
-  .then(() => db.updateNotify(tx))
+  .then(() => dbm.updateNotify(tx))
 }
 
 function monitorLiveIncoming () {
   const statuses = ['notSeen', 'published', 'insufficientFunds']
 
-  return db.fetchOpenTxs(statuses, STALE_LIVE_INCOMING_TX_AGE)
+  return dbm.fetchOpenTxs(statuses, STALE_LIVE_INCOMING_TX_AGE)
   .then(txs => Promise.all(txs.map(processTxStatus)))
   .catch(logger.error)
 }
@@ -286,22 +289,37 @@ function monitorLiveIncoming () {
 function monitorIncoming () {
   const statuses = ['notSeen', 'published', 'authorized', 'instant', 'rejected', 'insufficientFunds']
 
-  return db.fetchOpenTxs(statuses, STALE_INCOMING_TX_AGE)
+  return dbm.fetchOpenTxs(statuses, STALE_INCOMING_TX_AGE)
   .then(txs => Promise.all(txs.map(processTxStatus)))
   .catch(logger.error)
 }
 
 function monitorUnnotified () {
-  db.fetchUnnotifiedTxs(MAX_NOTIFY_AGE, MIN_NOTIFY_AGE)
+  dbm.fetchUnnotifiedTxs(MAX_NOTIFY_AGE, MIN_NOTIFY_AGE)
   .then(txs => Promise.all(txs.map(notifyConfirmation)))
   .catch(logger.error)
 }
 
+function pong () {
+  db.none('insert into server_events (event_type) values ($1)', ['ping'])
+  .catch(logger.error)
+}
+
+function pongClear () {
+  const sql = `delete from server_events
+  where event_type=$1
+  and created < now() - interval $2`
+
+  db.none(sql, ['ping', PONG_TTL])
+  .catch(logger.error)
+}
+
 /*
  * Polling livecycle
  */
 function startPolling () {
   executeTrades()
+  pongClear()
 
   setInterval(executeTrades, TRADE_INTERVAL)
   setInterval(monitorLiveIncoming, LIVE_INCOMING_TX_INTERVAL)
@@ -309,7 +327,8 @@ function startPolling () {
   setInterval(monitorUnnotified, UNNOTIFIED_INTERVAL)
   setInterval(sweepLiveHD, SWEEP_LIVE_HD_INTERVAL)
   setInterval(sweepOldHD, SWEEP_OLD_HD_INTERVAL)
-
+  setInterval(pong, PONG_INTERVAL)
+  setInterval(pongClear, PONG_CLEAR_INTERVAL)
   monitorLiveIncoming()
   monitorIncoming()
   monitorUnnotified()
@@ -369,7 +388,7 @@ function executeTrades () {
   const settings = settingsLoader.settings()
   const config = settings.config
 
-  return db.devices()
+  return dbm.devices()
   .then(devices => {
     const deviceIds = devices.map(device => device.device_id)
     const lists = deviceIds.map(deviceId => {
@@ -492,7 +511,7 @@ function checkDeviceBalances (deviceId) {
 }
 
 function checkBalances () {
-  return db.devices()
+  return dbm.devices()
   .then(devices => {
     const deviceIds = devices.map(r => r.device_id)
     const deviceBalancePromises = deviceIds.map(deviceId => checkDeviceBalances(deviceId))
@@ -533,7 +552,7 @@ function getPhoneCode (phone) {
 }
 
 function fetchPhoneTx (phone) {
-  return db.fetchPhoneTxs(phone, TRANSACTION_EXPIRATION)
+  return dbm.fetchPhoneTxs(phone, TRANSACTION_EXPIRATION)
   .then(txs => {
     const confirmedTxs = txs.filter(tx => R.contains(tx.status, ['instant', 'confirmed']))
     if (confirmedTxs.length > 0) {
@@ -556,20 +575,20 @@ function sweepHD (row) {
   .then(txHash => {
     if (txHash) {
       logger.debug('[%s] Swept address with tx: %s', cryptoCode, txHash)
-      return db.markSwept(row.tx_id)
+      return dbm.markSwept(row.tx_id)
     }
   })
   .catch(err => logger.error('[%s] Sweep error: %s', cryptoCode, err.message))
 }
 
 function sweepLiveHD () {
-  return db.fetchLiveHD()
+  return dbm.fetchLiveHD()
   .then(rows => Promise.all(rows.map(sweepHD)))
   .catch(err => logger.error(err))
 }
 
 function sweepOldHD () {
-  return db.fetchOldHD()
+  return dbm.fetchOldHD()
   .then(rows => Promise.all(rows.map(sweepHD)))
   .catch(err => logger.error(err))
 }
diff --git a/migrations/020-add-server-events.js b/migrations/020-add-server-events.js
new file mode 100644
index 00000000..93d0ce0e
--- /dev/null
+++ b/migrations/020-add-server-events.js
@@ -0,0 +1,17 @@
+var db = require('./db')
+
+exports.up = function (next) {
+  var sql = [
+    `create table server_events (
+      id serial PRIMARY KEY,
+      event_type text NOT NULL,
+      created timestamptz NOT NULL default now()
+    )`,
+    'CREATE INDEX ON server_events (created)'
+  ]
+  db.multi(sql, next)
+}
+
+exports.down = function (next) {
+  next()
+}