chore(): add env variable for max batch size

Author: e11sy

.env.sample

@@ -20,6 +20,8 @@ JWT_SECRET_REFRESH_TOKEN=abacaba
 # JWT secret for user's access token
 JWT_SECRET_ACCESS_TOKEN=belarus
 
+# max document could for one read request to the database
+MAX_DB_READ_BATCH_SIZE=100000
 
 # JWT secret for signing tokens for processing billing requests
 JWT_SECRET_BILLING_CHECKSUM=checksum_secret

src/models/eventsFactory.js

@@ -7,7 +7,7 @@ const Event = require('../models/event');
 const { ObjectID } = require('mongodb');
 const { composeEventPayloadByRepetition } = require('../utils/merge');
 
-const MAX_DB_READ_BATCH_SIZE = 80000;
+const MAX_DB_READ_BATCH_SIZE = process.env.MAX_DB_READ_BATCH_SIZE;
 
 /**
  * @typedef {import('mongodb').UpdateWriteOpResult} UpdateWriteOpResult