Determine why submission_id and tag_id increments jump after server restarts

[lewismc]

Upon PostGIS restarts we have observed both tag_ig and submission_id's for new entries jumping by around ~30 values.
tagbase_schema.sql has not been touched in ~2 months so we need to further investgate.

This is an acceptable bug and does not block 0.9.0 release as we can avoid this bug by simply NOT restarting the container.