Truncate/trim server tables

lib/plugins.js

@@ -9,6 +9,7 @@ const BN = require('./bn')
 const dbm = require('./postgresql_interface')
 const db = require('./db')
 const logger = require('./logger')
+const logs = require('./logs')
 const T = require('./time')
 const configManager = require('./config-manager')
 const ticker = require('./ticker')
@@ -412,17 +413,15 @@ function plugins (settings, deviceId) {
     return sendTransactionMessage(rec)
   }
 
-  function pong () {
-    db.none('insert into server_events (event_type) values ($1)', ['ping'])
+  function clearOldLogs () {
+    return logs.clearOldLogs()
       .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])
+  function pong () {
+    return db.none(`UPDATE server_events SET created=now() WHERE event_type=$1;
+       INSERT INTO server_events (event_type) SELECT $1
+       WHERE NOT EXISTS (SELECT 1 FROM server_events WHERE event_type=$1);`, ['ping'])
       .catch(logger.error)
   }
 
@@ -778,7 +777,7 @@ function plugins (settings, deviceId) {
     getPhoneCode,
     executeTrades,
     pong,
-    pongClear,
+    clearOldLogs,
     notifyConfirmation,
     sweepHd,
     sendMessage,