Allow local changes to db seeds

Rely on local seeds.sql rather than pulling it from internet. This makes
it possible to experiment with local changes to seeds.sql

Delete seeds.sql sections which referred to db tables that no longer exist

When seeding database, do not drop and recreate the local database - instead
keep the existing local database

Auto generate schema.sql after any local migration to ensure it
matches current database schema

Check schema.sql and seeds.sql into version control as per community
conventions.