delete JsonNode as far as possible for speed up

[itsumura-h]

No description provided.

[sgmihai]

I wonder if this is related to my performance problem.
Trying to insert 30.000 rows in an empty database, it takes about 5-6 minutes, doing one row insert at a time.
If I insert all the data at once (seq[JsonNode]), in sqlite, I get a "too many sql variables" error. Somehow the library doesn't batch them correctly.
This is how the query looks, truncated, from the output from a seq[JsonNode] insert, taken from the allographer log file, 1.1MB in size: https://pastebin.com/raw/tB6WBz27
Seems that you can only have max 999 such values in sqlite insert, so the lib might be buggy ? Also the docs are outdated, they mention an "inserts" method, which is not available anymore, got merged in the normal insert one.