# Functions
NewCleanIDsProvider creates CleanIDsProvider instances.
NewCleanRecord initiates object.
NewCollection initiates new collection for mongo.
NewIndexData creates index data.
NewLocker creates Locker instance.
NewSessionProvider creates Mongo session provider.
Sanitize mongo input.
SkipNoDocErr checks error and skips if error is mongo.ErrNoDocuments.
# Structs
CleanIDsProvider returns old IDs to remove from system.
CleanRecord deletes mongo table record.
IndexData keeps index creation data.
Locker acquires lock in db.
SessionProvider connects and provides session for mongo DB.