Truncate/trim server tables

lib/logs.js

@@ -54,6 +54,14 @@ function update (deviceId, logLines) {
     return _.mapKeys(_.snakeCase, formatted)
   }, logLines)
   const sql = pgp.helpers.insert(logs, cs) + 'on conflict do nothing'
+
+  return db.none(sql)
+}
+
+function clearOldLogs () {
+  const sql = `delete from logs
+    where timestamp < now() - interval '3 days'`
+
   return db.none(sql)
 }
 
@@ -87,4 +95,4 @@ function getMachineLogs (deviceId, until = new Date().toISOString()) {
     }))
 }
 
-module.exports = { getUnlimitedMachineLogs, getMachineLogs, update, getLastSeen }
+module.exports = { getUnlimitedMachineLogs, getMachineLogs, update, getLastSeen, clearOldLogs }