fix: enforce match_mode guard and drop leftover e_auto_cancel_mode

- Add early-return in schedule_tournament_match when match_mode = 'admin'
  to prevent auto-scheduling of admin-only matches
- Add cleanup migration to drop e_auto_cancel_mode table from prior dev runs

Author: Flegma

hasura/functions/tournaments/schedule_tournament_match.sql

@@ -55,6 +55,18 @@ CREATE OR REPLACE FUNCTION public.schedule_tournament_match(bracket public.tourn
          _match_options_id := tournament.match_options_id;
      END IF;
 
+    -- Enforce match_mode: skip auto-scheduling for admin-only matches
+    DECLARE
+        _match_mode text;
+    BEGIN
+        SELECT mo.match_mode INTO _match_mode
+        FROM match_options mo WHERE mo.id = _match_options_id;
+
+        IF _match_mode = 'admin' THEN
+            RETURN NULL;
+        END IF;
+    END;
+
      -- Per-round best_of resolution (only when bracket has no custom match_options)
      IF bracket.match_options_id IS NULL THEN
          IF stage.type = 'Swiss' THEN

hasura/migrations/default/1772556087000_drop_e_auto_cancel_mode/down.sql

@@ -0,0 +1,4 @@
+CREATE TABLE IF NOT EXISTS public.e_auto_cancel_mode (
+    value text NOT NULL PRIMARY KEY,
+    description text NOT NULL
+);

hasura/migrations/default/1772556087000_drop_e_auto_cancel_mode/up.sql

@@ -0,0 +1 @@
+DROP TABLE IF EXISTS public.e_auto_cancel_mode;