volume mapping synology docker?

[wheeleran]

hi. after a bit of a struggle, i've got Umami up and running on a Synology Diskstation in a docker container, using the git docker-compose. i was unsure about the volume mapping config for umami-db-data, and in general, so i left it blank. i'm new to this, so what happens when i update? is everything - stats, config - wiped out? this is one of my first docker-compose installs. i usually use the synology docker UI, where i usually mount and map specific config folders outside the container in a custom folder. this time, i uploaded and unzipped everything from the git zip to that same custom folder, and ran the docker-compose from there. ummm, everything works, i'm just worried about updating. can someone please ELI5, thanks!