code: public int entryExistsFor(String userUID) {
  		String selection = RelationshipEntry.COLUMN_USER_UUID + " = ?";
  		String[] selectionArgs = { userUID };
  		String[] columns = { RelationshipEntry.COLUMN_REQUEST_STATUS };
  		SQLiteDatabase db = getReadableDatabase();
  		Cursor cursor = db.query(RelationshipEntry.TABLE_PERSON_AUTH, columns, selection, selectionArgs, /* groupBy */null, /* having */null, /* orderBy */
  				null);
  		if (cursor.moveToNext()) {
  			return cursor.getInt(cursor.getColumnIndex(RelationshipEntry.COLUMN_REQUEST_STATUS));
  		}
  		cursor.close();
  		return REQUEST_NOT_EXIST;
  	}
docs: check if an entry for the specified user id exists. Returns the entry
  state.
  
  @param userUID
  @return