feat(multiplayer): persist ranked arena allocations

server/store/match_sql_test.go

@@ -59,6 +59,19 @@ func TestAcceptedMatchPromotionHonoursPlaylistSizeInvariant(t *testing.T) {
 	}
 }
 
+func TestRankedAcceptedMatchPlanRequiresArenaAfterPlaylistResolution(t *testing.T) {
+	plan := AcceptedMatchPlan{MatchID: "match-1", ProposalID: "proposal-1", Region: "EU", Protocol: 1, Players: []MatchPlayer{{PlayerID: "player-a", Team: 0, Slot: 0}, {PlayerID: "player-b", Team: 1, Slot: 3}}}
+	if !validAcceptedMatchPlan(plan) {
+		t.Fatal("test plan should reach the database playlist guard")
+	}
+	// CreateMatchFromAcceptedProposal owns the playlist lookup, so a nil DB is
+	// the only no-database check available here; the integration suite exercises
+	// the resolved ranked branch against PostgreSQL.
+	if err := CreateMatchFromAcceptedProposal(nil, nil, plan, time.Now()); err == nil {
+		t.Fatal("nil database accepted")
+	}
+}
+
 func TestMatchPlayersFromTeamsUsesDeterministicTeamSlots(t *testing.T) {
 	teams := domain.Teams{
 		Team0: []domain.Candidate{{PlayerID: "bravo"}, {PlayerID: "alpha"}},