polishing chart, build info in top left

seeds/fake.js

@@ -8,7 +8,6 @@
 'use strict';
 
 const faker = require ('faker');
-const sn = require ('simplex-noise');
 
 const apps = [];
 
@@ -20,17 +19,23 @@ async function create_app (knex) {
   apps.push (id);
 }
 
-function create_log (index, simplex) {
+let last_t = 0;
+let last_h = 0;
+
+function create_log (timestamp) {
+  last_t += faker.random.number (3) - 1;
+  last_h += faker.random.number (2) - 1;
+
   const data = {
-    light:       faker.random.number (),
-    temperature: simplex.noise2D (index * 0.1, 0),
-    humidity:    simplex.noise2D (index * 0.1, 1000)
+    light:       faker.random.number (10),
+    temperature: last_t,
+    humidity:    last_h
   };
   return {
     app_id:       faker.random.arrayElement (apps),
     message:   faker.random.words (),
     data:      JSON.stringify (data),
-    timestamp: faker.date.recent ()
+    timestamp
   };
 }
 
@@ -41,10 +46,11 @@ async function seed (knex) {
     // eslint-disable-next-line no-await-in-loop
     await create_app (knex);
 
-  const simplex = (new sn);
-  const log = (Array (20))
+  const log = (Array (1000))
     .fill (() => null)
-    .map ((a, index) => create_log (index, simplex));
+    .map (() => faker.date.recent (30))
+    .sort ()
+    .map ((t) => create_log (t));
 
   await knex.batchInsert ('log', log, 10);
 }