Replace string-quoted station_id lists with comma-separated, integer-casted lists and harden SQL across awards models. This diff converts constructions like "'a','b'" to implode(',', array_map('intval', ...)) and uses $this->db->escape_str() for band/mode values and band lists to reduce injection/format issues. Added helper methods (addModeToQuery, addBandToQuery variants) to centralize mode/band filtering, parameterized time/mode/band queries in Gmdxsummer_model, and escaped band arrays when building IN() lists. Also added null/empty-checks for logbook arrays in several models and small refactors (e.g. VUCC addBandToQuery) to keep SQL building consistent.
Advance the GMDX Summer Challenge event to 2026: update controller week end timestamps, and update view copy and table dates/entry link to reflect the new event window (11 May – 5 July 2026). In the model introduce START_DATE (2026-05-11), add validation to ignore empty/null COL_GRIDSQUARE values, and change combined-count logic to normalize gridsquares and group modes into CW / VOICE / DIGITAL so counts are consistent and case-insensitive.
