Enforce uniqueness of IDEA IDs

...l/mysql_migration_0000_downgrade_deduplicate_idea_ids.sql

...sql/mysql_migration_0000_upgrade_deduplicate_idea_ids.sql

...tgresql_migration_0000_downgrade_deduplicate_idea_ids.sql

...ostgresql_migration_0000_upgrade_deduplicate_idea_ids.sql

warden_server/test_warden_server.py

warden_server/warden_3.0_mysql.sql

warden_server/warden_3.0_postgres.sql

warden_server/warden_server.py