Creating a multi-line burnup linechart using multiple date columns

Date table:

hasData = 
var min_date = CALCULATE(MIN(FIRSTDATE('Append Bugs'[Created Date]);FIRSTDATE('Append Bugs'[Completed Date]));ALL('Append Bugs'))
var max_date = CALCULATE(MAX(LASTDATE('Append Bugs'[Created Date]);LASTDATE('Append Bugs'[Completed Date]));ALL('Append Bugs'))
return IF(AND([Date]>=min_date;[Date]<=max_date);"Yes";"No")

I put a check if date is in between min and max date in date, so visuals looks better. I've put this filter in a page filter panel.

Basic Measures

Definition of a bug:

Number of bugs = COUNTROWS('Append Bugs')

Definition of a new bug:

New bugs = CALCULATE([Number of bugs];USERELATIONSHIP('Date'[Date];'Append Bugs'[Created Date]))

Definition of a closed bug:

Closed bugs = CALCULATE([Number of bugs];USERELATIONSHIP('Date'[Date];'Append Bugs'[Completed Date]))

 RT Measures

Definition of a bug RT:

Number of bugs RT = 
var ref_date = LASTDATE('Date'[Date])
return CALCULATE([Number of bugs];FILTER(ALLSELECTED('Date');[Date]<=ref_date))

Definition of a new bug RT: 

New bugs RT = CALCULATE([Number of bugs RT];USERELATIONSHIP('Date'[Date];'Append Bugs'[Created Date]))​

Definition of a closed bug RT:

Closed bugs RT = CALCULATE([Number of bugs RT];USERELATIONSHIP('Date'[Date];'Append Bugs'[Completed Date]))

Bonus - Opened bug each days:

Open bugs = [New bugs RT] - [Closed bugs RT]

Results:

PBIX file can be found here: https://we.tl/t-Br895KqNr6