diff --git a/server/src/config.ts b/server/src/config.ts
index b6b3c46..75883f8 100644
--- a/server/src/config.ts
+++ b/server/src/config.ts
@@ -16,7 +16,6 @@ export const SEGMENTS_DATABASE_PATH = path.join(DATA_PATH, 'segments.db');
 export const FILES_DATABASE_PATH = path.join(DATA_PATH, 'files.db');
 
 export const DATASETS_PATH = path.join(DATA_PATH, 'datasets');
-//export const ANALYTIC_UNITS_PATH = path.join(DATA_PATH, 'analytic_units');
 export const MODELS_PATH = path.join(DATA_PATH, 'models');
 export const METRICS_PATH = path.join(DATA_PATH, 'metrics');
 export const SEGMENTS_PATH = path.join(DATA_PATH, 'segments');
diff --git a/server/src/controllers/analytics_controller.ts b/server/src/controllers/analytics_controller.ts
index 6e1a627..bc140ad 100644
--- a/server/src/controllers/analytics_controller.ts
+++ b/server/src/controllers/analytics_controller.ts
@@ -1,7 +1,5 @@
-import * as DataService from '../services/data_service';
-import { getTarget } from './metrics_controler';
-import { getLabeledSegments, insertSegments, removeSegments } from './segments_controller';
-import * as AnalyticUnit from '../models/analytic_unit'
+import * as SegmentsController from '../models/segment_model';
+import * as AnalyticUnit from '../models/analytic_unit_model'
 import { AnalyticsService, AnalyticsMessage } from '../services/analytics_service';
 
 
@@ -23,14 +21,6 @@ function onTaskResult(taskResult: any) {
   }
 }
 
-async function onFileSave(payload: any): Promise<any> {
-  return DataService.saveFile(payload.filename, payload.content);
-}
-
-async function onFileLoad(payload: any): Promise<any> {
-  return DataService.loadFile(payload.filename);
-}
-
 async function onMessage(message: AnalyticsMessage) {
   let responsePayload = null;
   let resolvedMethod = false;
@@ -69,7 +59,7 @@ export function terminate() {
 }
 
 async function runTask(task): Promise<any> {
-  let anomaly: AnalyticUnit.AnalyticUnit = AnalyticUnit.findById(task.analyticUnitId);
+  let anomaly: AnalyticUnit.AnalyticUnit = await AnalyticUnit.findById(task.analyticUnitId);
   task.metric = {
     datasource: anomaly.metric.datasource,
     targets: anomaly.metric.targets.map(getTarget)
@@ -86,7 +76,7 @@ async function runTask(task): Promise<any> {
 export async function runLearning(id: AnalyticUnit.AnalyticUnitId) {
   let segments = getLabeledSegments(id);
   AnalyticUnit.setStatus(id, 'LEARNING');
-  let unit = AnalyticUnit.findById(id);
+  let unit = await AnalyticUnit.findById(id);
   let pattern = unit.type;
   let task = {
     analyticUnitId: id,
@@ -106,12 +96,11 @@ export async function runLearning(id: AnalyticUnit.AnalyticUnitId) {
   }
 }
 
-
 export async function runPredict(id: AnalyticUnit.AnalyticUnitId) {
-  let unit = AnalyticUnit.findById(id);
+  let unit = await AnalyticUnit.findById(id);
   let pattern = unit.type;
   let task = {
-    type: 'predict',
+    type: 'PREDICT',
     analyticUnitId: id,
     pattern,
     lastPredictionTime: unit.lastPredictionTime
@@ -141,3 +130,14 @@ export async function runPredict(id: AnalyticUnit.AnalyticUnitId) {
 export function isAnalyticReady(): boolean {
   return analyticsService.ready;
 }
+
+export async function createAnalyticUnitFromObject(obj: any): Promise<AnalyticUnit.AnalyticUnitId> {
+
+  
+  
+
+
+  runLearning(newId);
+
+  return 
+}
\ No newline at end of file
diff --git a/server/src/controllers/metrics_controler.ts b/server/src/controllers/metrics_controler.ts
deleted file mode 100644
index 7cf5d45..0000000
--- a/server/src/controllers/metrics_controler.ts
+++ /dev/null
@@ -1,30 +0,0 @@
-import { getJsonDataSync, writeJsonDataSync }  from '../services/json_service';
-import { METRICS_PATH } from '../config';
-
-import * as crypto from 'crypto';
-
-import * as path from 'path';
-
-
-function saveTargets(targets) {
-  let metrics = [];
-  for (let target of targets) {
-    metrics.push(saveTarget(target));
-  }
-  return metrics;
-}
-
-function saveTarget(target) {
-  //const md5 = crypto.createHash('md5')
-  const targetId = crypto.createHash('md5').update(JSON.stringify(target)).digest('hex');
-  let filename = path.join(METRICS_PATH, `${targetId}.json`);
-  writeJsonDataSync(filename, target);
-  return targetId;
-}
-
-function getTarget(targetId) {
-  let filename = path.join(METRICS_PATH, `${targetId}.json`);
-  return getJsonDataSync(filename);
-}
-
-export { saveTargets, getTarget }
diff --git a/server/src/index.ts b/server/src/index.ts
index 31ca62d..ce04d94 100644
--- a/server/src/index.ts
+++ b/server/src/index.ts
@@ -4,7 +4,6 @@ import { router as segmentsRouter } from './routes/segments_router';
 
 import * as AnalyticsController from './controllers/analytics_controller';
 
-import * as Data from './services/data_service';
 import * as ProcessService from './services/process_service';
 
 import { HASTIC_PORT } from './config';
@@ -14,7 +13,6 @@ import * as Router from 'koa-router';
 import * as bodyParser from 'koa-bodyparser';
 
 
-Data.checkDataFolders();
 AnalyticsController.init();
 ProcessService.registerExitHandler(AnalyticsController.terminate);
 
diff --git a/server/src/models/analytic_unit.ts b/server/src/models/analytic_unit.ts
deleted file mode 100644
index a9682b0..0000000
--- a/server/src/models/analytic_unit.ts
+++ /dev/null
@@ -1,84 +0,0 @@
-import { loadFile, saveFile } from '../services/data_service';
-
-import * as crypto from 'crypto';
-
-import * as path from 'path'
-import * as fs from 'fs'
-
-
-export type Datasource = {
-  method: string,
-  data: Object,
-  params: Object,
-  type: string,
-  url: string
-}
-
-export type Metric = {
-  datasource: string,
-  targets: string[]
-}
-
-export type AnalyticUnitId = string;
-
-export type AnalyticUnit = {
-  id?: AnalyticUnitId,
-  name: string,
-  panelUrl: string,
-  type: string,
-  metric: Metric,
-  datasource: Datasource
-  status: string,
-  error?: string,
-  lastPredictionTime: number,
-  nextId: number
-}
-
-export function createItem(item: AnalyticUnit): AnalyticUnitId {
-  const hashString = item.name + (new Date()).toString();
-  const newId: AnalyticUnitId = crypto.createHash('md5').update(hashString).digest('hex');
-  let filename = `${newId}.json`;
-  if(fs.existsSync(filename)) {
-    throw new Error(`Can't create item with id ${newId}`);
-  }
-  save(newId, item);
-  item.id = newId;
-  return newId;
-}
-
-export function remove(id: AnalyticUnitId) {
-  let filename = `${id}.json`;
-  fs.unlinkSync(filename);
-}
-
-export function save(id: AnalyticUnitId, unit: AnalyticUnit) {
-  let filename = `${id}.json`;
-  return saveFile(filename, JSON.stringify(unit));
-}
-
-// TODO: make async
-export async function findById(id: AnalyticUnitId): Promise<AnalyticUnit> {
-  let filename = `${id}.json`;
-  if(!fs.existsSync(filename)) {
-    throw new Error(`Can't find Analytic Unit with id ${id}`);
-  }
-  let result = await loadFile(filename);
-  return JSON.parse(result);
-}
-
-export async function setStatus(predictorId: AnalyticUnitId, status: string, error?: string) {
-  let info = await findById(predictorId);
-  info.status = status;
-  if(error !== undefined) {
-    info.error = error;
-  } else {
-    info.error = '';
-  }
-  save(predictorId, info);
-}
-
-export async function setPredictionTime(id: AnalyticUnitId, time: number) {
-  let info = await findById(id);
-  info.lastPredictionTime = time;
-  save(id, info);
-}
diff --git a/server/src/models/analytic_unit_model.ts b/server/src/models/analytic_unit_model.ts
new file mode 100644
index 0000000..6ba8619
--- /dev/null
+++ b/server/src/models/analytic_unit_model.ts
@@ -0,0 +1,84 @@
+import { Metric, metricFromObj } from './metric_model';
+import { Collection, makeDBQ } from '../services/data_service';
+
+
+let db = makeDBQ(Collection.ANALYTIC_UNITS);
+
+
+
+export type AnalyticUnitId = string;
+
+export type AnalyticUnit = {
+  id?: AnalyticUnitId,
+  name: string,
+  panelUrl: string,
+  type: string,
+  metric: Metric
+  status: string,
+  error?: string,
+  lastPredictionTime: number,
+  nextId: number
+}
+
+
+export function analyticUnitFromObj(obj: any): AnalyticUnit {
+  if(obj === undefined) {
+    throw new Error('obj is undefined');
+  }
+  if(obj.type === undefined) {
+    throw new Error(`Missing field "type"`);
+  }
+  if(obj.name === undefined) {
+    throw new Error(`Missing field "name"`);
+  }
+  if(obj.panelUrl === undefined) {
+    throw new Error(`Missing field "panelUrl"`);
+  }
+  if(obj.metric === undefined) {
+    throw new Error(`Missing field "datasource"`);
+  }
+  if(obj.metric.datasource === undefined) {
+    throw new Error(`Missing field "metric.datasource"`);
+  }
+  if(obj.metric.targets === undefined) {
+    throw new Error(`Missing field "metric.targets"`);
+  }
+
+  const unit: AnalyticUnit = {
+    name: obj.name,
+    panelUrl: obj.panelUrl,
+    type: obj.type,
+    datasource: obj.datasource,
+    metric: metric,
+    status: 'LEARNING',
+    lastPredictionTime: 0,
+    nextId: 0
+  };
+
+  return unit;
+}
+
+export async function findById(id: AnalyticUnitId): Promise<AnalyticUnit> {
+  return db.findOne(id);
+}
+
+export async function create(unit: AnalyticUnit): Promise<AnalyticUnitId> {
+  return db.insert(unit);
+}
+
+export async function remove(id: AnalyticUnitId): Promise<void> {
+  await db.remove(id);
+  return;
+}
+
+export async function update(id: AnalyticUnitId, unit: AnalyticUnit) {
+  return db.update(id, unit);
+}
+
+export async function setStatus(id: AnalyticUnitId, status: string, error?: string) {
+  return db.update(id, { status, error });
+}
+
+export async function setPredictionTime(id: AnalyticUnitId, lastPredictionTime: number) {
+  return db.update(id, { lastPredictionTime });
+}
diff --git a/server/src/models/metric_model.ts b/server/src/models/metric_model.ts
new file mode 100644
index 0000000..ca1ad16
--- /dev/null
+++ b/server/src/models/metric_model.ts
@@ -0,0 +1,49 @@
+import { Collection, makeDBQ } from '../services/data_service';
+
+
+let db = makeDBQ(Collection.METRICS);
+
+
+export type Datasource = {
+  method: string,
+  data: Object,
+  params: Object,
+  type: string,
+  url: string
+}
+
+export type Metric = {
+  datasource: Datasource,
+  targets: string[]
+}
+
+export function metricFromObj(obj: any): Metric {
+  const metric: Metric = {
+    datasource: obj.datasource,
+    targets: obj.targets;
+  };
+  return metric;
+}
+
+export async function saveTargets(targets: string[]) {
+  let metrics = [];
+  for (let target of targets) {
+    metrics.push(saveTarget(target));
+  }
+  return metrics;
+}
+
+export async function saveTarget(target: string) {
+  //const md5 = crypto.createHash('md5')
+  const targetId = crypto.createHash('md5').update(JSON.stringify(target)).digest('hex');
+  let filename = path.join(METRICS_PATH, `${targetId}.json`);
+  writeJsonDataSync(filename, target);
+  return targetId;
+}
+
+export async function getTarget(targetId) {
+  let filename = path.join(METRICS_PATH, `${targetId}.json`);
+  return getJsonDataSync(filename);
+}
+
+
diff --git a/server/src/controllers/segments_controller.ts b/server/src/models/segment_model.ts
similarity index 70%
rename from server/src/controllers/segments_controller.ts
rename to server/src/models/segment_model.ts
index 358b0b7..7183b30 100644
--- a/server/src/controllers/segments_controller.ts
+++ b/server/src/models/segment_model.ts
@@ -1,6 +1,5 @@
-import { getJsonDataSync, writeJsonDataSync }  from '../services/json_service';
-import { AnalyticUnitId, findById, save } from '../models/analytic_unit';
-import { SEGMENTS_PATH } from '../config';
+import * as AnalyticUnit from './analytic_unit_model';
+
 
 import * as _ from 'lodash';
 
@@ -8,7 +7,7 @@ import * as path from 'path';
 import * as fs from 'fs';
 
 
-export function getLabeledSegments(id: AnalyticUnitId) {
+export function getLabeledSegments(id: AnalyticUnit.AnalyticUnitId) {
   let filename = path.join(SEGMENTS_PATH, `${id}_labeled.json`);
 
   if(!fs.existsSync(filename)) {
@@ -24,7 +23,7 @@ export function getLabeledSegments(id: AnalyticUnitId) {
   }
 }
 
-export function getPredictedSegments(id: AnalyticUnitId) {
+export function getPredictedSegments(id: AnalyticUnit.AnalyticUnitId) {
   let filename = path.join(SEGMENTS_PATH, `${id}_segments.json`);
 
   let jsonData;
@@ -37,7 +36,7 @@ export function getPredictedSegments(id: AnalyticUnitId) {
   return jsonData;
 }
 
-export function saveSegments(id: AnalyticUnitId, segments) {
+export function saveSegments(id: AnalyticUnit.AnalyticUnitId, segments) {
   let filename = path.join(SEGMENTS_PATH, `${id}_labeled.json`);
 
   try {
@@ -48,9 +47,9 @@ export function saveSegments(id: AnalyticUnitId, segments) {
   }
 }
 
-export function insertSegments(id: AnalyticUnitId, addedSegments, labeled: boolean) {
+export async function insertSegments(id: AnalyticUnit.AnalyticUnitId, addedSegments, labeled: boolean) {
   // Set status
-  let info = findById(id);
+  let info = await AnalyticUnit.findById(id);
   let segments = getLabeledSegments(id);
 
   let nextId = info.nextId;
@@ -64,11 +63,11 @@ export function insertSegments(id: AnalyticUnitId, addedSegments, labeled: boole
   }
   info.nextId = nextId;
   saveSegments(id, segments);
-  save(id, info);
+  await AnalyticUnit.update(id, info);
   return addedIds;
 }
 
-export function removeSegments(id: AnalyticUnitId, removedSegments) {
+export function removeSegments(id: AnalyticUnit.AnalyticUnitId, removedSegments) {
   let segments = getLabeledSegments(id);
   for (let segmentId of removedSegments) {
     segments = segments.filter(el => el.id !== segmentId);
diff --git a/server/src/routes/analytic_units_router.ts b/server/src/routes/analytic_units_router.ts
index dee28bb..be59684 100644
--- a/server/src/routes/analytic_units_router.ts
+++ b/server/src/routes/analytic_units_router.ts
@@ -1,9 +1,9 @@
 import * as Router from 'koa-router';
 
-import * as AnalyticUnit from '../models/analytic_unit';
+import * as AnalyticUnit from '../models/analytic_unit_model';
+
+import { createAnalyticUnitFromObject } from '../controllers/analytics_controller'
 
-import { runLearning } from '../controllers/analytics_controller'
-import { saveTargets } from '../controllers/metrics_controler';
 
 async function sendStatus(ctx: Router.IRouterContext) {
   try {
@@ -11,7 +11,7 @@ async function sendStatus(ctx: Router.IRouterContext) {
     if(id === undefined) {
       throw new Error('Id is undefined');
     }
-    let unit = AnalyticUnit.findById(id);
+    let unit = await AnalyticUnit.findById(id);
 
     if(unit.status === undefined) {
       throw new Error('status is undefined');
@@ -34,7 +34,7 @@ async function findItem(ctx: Router.IRouterContext) {
       throw new Error('No id param in query');
     }
 
-    let unit: AnalyticUnit.AnalyticUnit = AnalyticUnit.findById(id);
+    let unit: AnalyticUnit.AnalyticUnit = await AnalyticUnit.findById(id);
 
     ctx.response.body = {
       name: unit.name,
@@ -55,53 +55,13 @@ async function createItem(ctx: Router.IRouterContext) {
 
     let body = ctx.request.body;
 
-    if(body.type === undefined) {
-      throw new Error(`Missing field "type"`);
-    }
-    if(body.name === undefined) {
-      throw new Error(`Missing field "name"`);
-    }
-    if(body.panelUrl === undefined) {
-      throw new Error(`Missing field "panelUrl"`);
-    }
-    if(body.metric === undefined) {
-      throw new Error(`Missing field "datasource"`);
-    }
-    if(body.metric.datasource === undefined) {
-      throw new Error(`Missing field "metric.datasource"`);
-    }
-    if(body.metric.targets === undefined) {
-      throw new Error(`Missing field "metric.targets"`);
-    }
-
-    const metric: AnalyticUnit.Metric = {
-      datasource: body.metric.datasource,
-      targets: saveTargets(body.metric.targets)
-    };
-
-    const unit: AnalyticUnit.AnalyticUnit = {
-      name: body.name,
-      panelUrl: body.panelUrl,
-      type: body.type,
-      datasource: body.datasource,
-      metric: metric,
-      status: 'learning',
-      lastPredictionTime: 0,
-      nextId: 0
-    };
+    await createAnalyticUnitFromObject(body);
 
-    let newId = AnalyticUnit.createItem(unit);
-    if(newId === null) {
-      ctx.response.status = 403;
-      ctx.response.body = {
-        code: 403,
-        message: 'Item exists'
-      };
-    }
 
+    let newId = await AnalyticUnit.create(unit);
     ctx.response.body = { id: newId };
 
-    runLearning(newId);
+    
   } catch(e) {
     ctx.response.status = 500;
     ctx.response.body = {
diff --git a/server/src/routes/segments_router.ts b/server/src/routes/segments_router.ts
index 7315171..f63a834 100644
--- a/server/src/routes/segments_router.ts
+++ b/server/src/routes/segments_router.ts
@@ -1,12 +1,12 @@
 import * as Router from 'koa-router';
 
-import { AnalyticUnitId } from '../models/analytic_unit';
+import { AnalyticUnitId } from '../models/analytic_unit_model';
 
 import {
   getLabeledSegments,
   insertSegments,
   removeSegments,
-} from '../controllers/segments_controller';
+} from '../models/segment_model';
 import { runLearning } from '../controllers/analytics_controller';
 
 
diff --git a/server/src/services/data_service.ts b/server/src/services/data_service.ts
index 3f4ce99..b91e8e2 100644
--- a/server/src/services/data_service.ts
+++ b/server/src/services/data_service.ts
@@ -3,74 +3,108 @@ import * as config from '../config';
 import * as nedb from 'nedb';
 import * as fs from 'fs';
 
-export const db = {
-  analyticUnits: new nedb({ filename: config.ANALYTIC_UNITS_DATABASE_PATH, autoload: true }),
-  metrics: new nedb({ filename: config.METRICS_DATABASE_PATH, autoload: true }),
-  segments: new nedb({ filename: config.SEGMENTS_DATABASE_PATH, autoload: true }),
-  files: new nedb({ filename: config.FILES_DATABASE_PATH, autoload: true })
-};
 
+export enum Collection { ANALYTIC_UNITS, METRICS, SEGMENTS };
 
-let dbUpsertFile = (query: any, updateQuery: any) => {
+
+/**
+ * Class which helps to make queries to your collection
+ * 
+ * @param { string | object } query: a key as a string or mongodb-style query
+ */
+export type DBQ = {
+  insert: (document: object) => string,
+  update: (query: string | object, updateQuery: any) => void,
+  findOne: (query: string | object) => any,
+  remove: (query: string | object) => number
+}
+
+export function makeDBQ(collection: Collection): DBQ {
+  return {
+    insert: dbInsert.bind(null, collection),
+    update: dbUpdate.bind(null, collection),
+    findOne: dbFindOne.bind(null, collection),
+    remove: dbRemove.bind(null, collection)
+  }
+}
+
+function wrapIdToQuery(query: string | object) {
+  if(typeof query === 'string') {
+    return { _id: query };
+  }
+  return query;
+}
+
+const db = new Map<Collection, nedb>();
+
+let dbInsert = (collection: Collection, doc: object) => {
+  return new Promise<string>((resolve, reject) => {
+    db[collection].insert(doc, (err, newDoc) => {
+      if(err) {
+        reject(err);
+      } else {
+        resolve(newDoc._id);
+      }
+    });
+  });
+}
+
+let dbUpdate = (collection: Collection, query: string | object, updateQuery: object) => {
+  query = wrapIdToQuery(query);
   return new Promise<void>((resolve, reject) => {
-    db.files.update(query, updateQuery, { upsert: true }, (err: Error) => {
+    db[collection].update(query, updateQuery, { /* options */ }, (err: Error) => {
       if(err) {
         reject(err);
       } else {
-        console.log('saved shit with query ');
-        console.log(query);
-        console.log('saved shit with updateQuery ');
-        console.log(updateQuery);
         resolve();
       }
     });
   });
 }
 
-let dbLoadFile = (query: any) => {
+let dbFindOne = (collection: Collection, query: string | object) => {
+  query = wrapIdToQuery(query);
   return new Promise<any>((resolve, reject) => {
-    db.files.findOne(query, (err, doc) => {
+    db[collection].findOne(query, (err, doc) => {
       if(err) {
         reject(err);
       } else {
-        console.log('got shit with query');
-        console.log(query);
-        console.log('doc');
-        console.log(doc);
         resolve(doc);
       }
     });
   });
 }
 
+let dbRemove = (collection: Collection, query: string | object) => {
+  query = wrapIdToQuery(query);
+  return new Promise<number>((resolve, reject) => {
+    db[collection].remove(query, (err, numRemoved) => {
+      if(err) {
+        reject(err);
+      } else {
+        resolve(numRemoved);
+      }
+    });
+  });
+}
+
 function maybeCreate(path: string): void {
   if(fs.existsSync(path)) {
     return;
   }
   console.log('mkdir: ' + path);
   fs.mkdirSync(path);
-  console.log('exists: ' + fs.existsSync(path));
-}
-
-export async function saveFile(filename: string, content: string): Promise<void> {
-  return dbUpsertFile({ filename } , { filename, content });
 }
 
-export async function loadFile(filename: string): Promise<string> {
-  let doc = await dbLoadFile({ filename });
-  if(doc === null) {
-    return null;
-  }
-  return doc.content;
-}
-
-export function checkDataFolders(): void {
+function checkDataFolders(): void {
   [
     config.DATA_PATH,
-    config.DATASETS_PATH,
-    config.MODELS_PATH,
-    config.METRICS_PATH,
-    config.SEGMENTS_PATH,
     config.ZMQ_IPC_PATH
   ].forEach(maybeCreate);
 }
+checkDataFolders();
+
+// TODO: it's better if models request db which we create if it`s needed
+db[Collection.ANALYTIC_UNITS] = new nedb({ filename: config.ANALYTIC_UNITS_DATABASE_PATH, autoload: true });
+db[Collection.METRICS] = new nedb({ filename: config.ANALYTIC_UNITS_DATABASE_PATH, autoload: true });
+db[Collection.SEGMENTS] = new nedb({ filename: config.SEGMENTS_DATABASE_PATH, autoload: true });
diff --git a/server/src/services/notification_service.ts b/server/src/services/notification_service.ts
index 4b39a6b..126ca10 100644
--- a/server/src/services/notification_service.ts
+++ b/server/src/services/notification_service.ts
@@ -1,11 +1,11 @@
-import { findById } from '../models/analytic_unit';
+import { findById } from '../models/analytic_unit_model';
 
 import axios from 'axios';
 
 
 // TODO: send notification with payload without dep to AnalyticUnit
 export async function sendNotification(predictorId, active) {
-  let anomalyName = findById(predictorId).name;
+  let anomalyName = (await findById(predictorId)).name
   console.log('Notification ' + anomalyName);
 
   let notification = {