/snapshot endpoint fixed

[bavovna]

I find your tutorials both high signal and entertaining. Keep on doing great work!

I encountered this bug with the TA-Lib app though. /snapshot endpoint produces these files:

...
    datasets/daily/ALB,Albemarle Corp.csv
    datasets/daily/ALGN,Align Technology.csv
    datasets/daily/ALK,Alaska Air Group Inc.csv
    datasets/daily/ALL,Allstate Corp.csv
    datasets/daily/ALLE,Allegion.csv
    datasets/daily/ALXN,Alexion Pharmaceuticals.csv
...

And / endpoint expects files in datasets/daily to be named in a certain way ($ticker.csv). As a results, the program is not working as intended.

The problem is obvious, fix tested with:

FLASK_APP="app.py" flask run
curl -v "http://127.0.0.1:5000/snapshot"
...
< HTTP/1.0 200 OK
< Content-Type: application/json
< Content-Length: 19
< Server: Werkzeug/1.0.1 Python/3.8.5
< Date: Mon, 10 Aug 2020 04:11:26 GMT
<
{"code":"success"}

Datasets have been downloaded as expected.