@Please see attached workflow export that contains some playground database entries.
A workflow doesn't contain any Database schema entries, Importing a workflow doesn't import any schema (playground in your case ) table data that it was using. In other words a workflow can query a schema table, but when exported, the exported .dar file will not have any Database table contents.
So for your workflow to be working after importing into another WFA, you need to bring the old playground Database table data as well into the new WFA.
Playground Database schema and its entries are not saved in WFA backups as well. SO if you want to to transfer the playground DB, you'll need to export the playground DB as a mysqldump command and then import it into the new WFA server.
If you want I can give the commands to do it .
If this post resolved your issue, help others by selecting ACCEPT AS SOLUTION or adding a KUDO.
One option that may be better for generating static-information like a service catalog is to define a new schema for the data your representing, and to create a datasource that outputs the entries you want in the table.
ie. Create a new schema and define Dictionary attributes to match your existing playground tables. Then Create a PowerShell datasource type that creates the set of CSV files containing the data you want.
This new Schema with it's attached DataSource type will exist in a normal WFA Export/Import. After an import a datasource acquisition for that schema must be run, and this will populate the table to query.