API tests become slower at each run

[bergie]

On first run with a fresh database, the API tests are really fast (1min 10sec on my MacBook Air). But then on each successive run they become slower.

This is probably because some test data (at least repligard table entries) accumulate into the database.

We should clean the DB up, or ensure it is a new one between runs.

[bergie]

After the first run (1:20), the database contains:

• 2361 repligard entries
• 5 blobs
• 17 midgard_nodes
• 43 midgard_node_properties

After second run:

• 4720 repligard entries