not clear whether data arrived to server and/or is invalid

[bastianilso]

current data flow:

• data logged by arduinologger
• people can publish to server
• data gets sent to php, and then to database.
• r shiny website loads data from database
• the data is cleaned/filtered
• sessions/participants are counted
• data is visualized

When data dont appear in the website, several reasons can cause this.

1. Fx that we could not upload it.
2. that we could not find it in the database.
3. that data is filtered away when cleaning.

This makes it difficult for people to tell what happened and difficult for testing. We should ideally still indicate that data is present, even if it was filtered away/cleaned.