nedb var names review

[jonyrock-back]

I believe that this all related only to nedb logic, nothing else

export const DATA_PATH = path.join(__dirname, '../../data');
export const ANALYTIC_UNITS_DATABASE_PATH = path.join(DATA_PATH, 'analytic_units.db');
export const ANALYTIC_UNIT_CACHES_DATABASE_PATH = path.join(DATA_PATH, 'analytic_unit_caches.db');
export const SEGMENTS_DATABASE_PATH = path.join(DATA_PATH, 'segments.db');
export const THRESHOLD_DATABASE_PATH = path.join(DATA_PATH, 'treshold.db');
export const DETECTION_SPANS_DATABASE_PATH = path.join(DATA_PATH, 'detection_spans.db');
export const DB_META_PATH = path.join(DATA_PATH, 'db_meta.db');

maybe we can make a separate config for nedb, something like nedb.json where we put all related to nedb variables