sorry for the response time
(many work in France presently)
I did not delete the plugin correctly (I guess I used wp delete instead of wp uninstall)
new test with the initial database and version 3.64.1 :
1. wp plugin uninstall --deactivate popup-builder works fine and the database is properly cleaned
2. manual method by removing js code is ok too
for information:
my character string to search was: dest.collectfasttracks.com
`
wp db search ‘String.fromCharCode(104,116,116,112,115,58,47,47,100,101,115,116,46,99,111,108,108,101,99,116,102,97,115,116,116,114,97,99,107,115,46,99,111,109’
`
grep -Iinrl ‘https://dest.collectfasttracks.com/’ wp-content/
wp-content/themes/xxx/header.php
`