test(channelserver): add store tests for new repository methods

Cover the three repository methods added in the previous commit:
- CharacterRepo.LoadSaveData: normal, new-character, and not-found cases
- EventRepo.GetEventQuests: empty, multi-row, ordering, tx commit/rollback
- UserRepo.BanUser: permanent, temporary, and both upsert directions

server/channelserver/repo_user_test.go

@@ -0,0 +1,110 @@
+package channelserver
+
+import (
+	"database/sql"
+	"testing"
+	"time"
+
+	"github.com/jmoiron/sqlx"
+)
+
+func setupUserRepo(t *testing.T) (*UserRepository, *sqlx.DB, uint32) {
+	t.Helper()
+	db := SetupTestDB(t)
+	userID := CreateTestUser(t, db, "user_repo_test")
+	repo := NewUserRepository(db)
+	t.Cleanup(func() { TeardownTestDB(t, db) })
+	return repo, db, userID
+}
+
+func TestBanUserPermanent(t *testing.T) {
+	repo, db, userID := setupUserRepo(t)
+
+	if err := repo.BanUser(userID, nil); err != nil {
+		t.Fatalf("BanUser (permanent) failed: %v", err)
+	}
+
+	// Verify ban exists with NULL expires
+	var gotUserID uint32
+	var expires sql.NullTime
+	err := db.QueryRow("SELECT user_id, expires FROM bans WHERE user_id=$1", userID).Scan(&gotUserID, &expires)
+	if err != nil {
+		t.Fatalf("Verification query failed: %v", err)
+	}
+	if gotUserID != userID {
+		t.Errorf("Expected user_id %d, got: %d", userID, gotUserID)
+	}
+	if expires.Valid {
+		t.Errorf("Expected NULL expires for permanent ban, got: %v", expires.Time)
+	}
+}
+
+func TestBanUserTemporary(t *testing.T) {
+	repo, db, userID := setupUserRepo(t)
+
+	expiry := time.Now().Add(24 * time.Hour).Truncate(time.Microsecond)
+	if err := repo.BanUser(userID, &expiry); err != nil {
+		t.Fatalf("BanUser (temporary) failed: %v", err)
+	}
+
+	var gotUserID uint32
+	var got time.Time
+	err := db.QueryRow("SELECT user_id, expires FROM bans WHERE user_id=$1", userID).Scan(&gotUserID, &got)
+	if err != nil {
+		t.Fatalf("Verification query failed: %v", err)
+	}
+	if gotUserID != userID {
+		t.Errorf("Expected user_id %d, got: %d", userID, gotUserID)
+	}
+	if !got.Equal(expiry) {
+		t.Errorf("Expected expires %v, got: %v", expiry, got)
+	}
+}
+
+func TestBanUserUpsertPermanentToTemporary(t *testing.T) {
+	repo, db, userID := setupUserRepo(t)
+
+	// First: permanent ban
+	if err := repo.BanUser(userID, nil); err != nil {
+		t.Fatalf("BanUser (permanent) failed: %v", err)
+	}
+
+	// Upsert: change to temporary
+	expiry := time.Now().Add(1 * time.Hour).Truncate(time.Microsecond)
+	if err := repo.BanUser(userID, &expiry); err != nil {
+		t.Fatalf("BanUser (upsert to temporary) failed: %v", err)
+	}
+
+	var got time.Time
+	err := db.QueryRow("SELECT expires FROM bans WHERE user_id=$1", userID).Scan(&got)
+	if err != nil {
+		t.Fatalf("Verification query failed: %v", err)
+	}
+	if !got.Equal(expiry) {
+		t.Errorf("Expected expires %v after upsert, got: %v", expiry, got)
+	}
+}
+
+func TestBanUserUpsertTemporaryToPermanent(t *testing.T) {
+	repo, db, userID := setupUserRepo(t)
+
+	// First: temporary ban
+	expiry := time.Now().Add(1 * time.Hour).Truncate(time.Microsecond)
+	if err := repo.BanUser(userID, &expiry); err != nil {
+		t.Fatalf("BanUser (temporary) failed: %v", err)
+	}
+
+	// Upsert: change to permanent
+	if err := repo.BanUser(userID, nil); err != nil {
+		t.Fatalf("BanUser (upsert to permanent) failed: %v", err)
+	}
+
+	var expires sql.NullTime
+	err := db.QueryRow("SELECT expires FROM bans WHERE user_id=$1", userID).Scan(&expires)
+	if err != nil {
+		t.Fatalf("Verification query failed: %v", err)
+	}
+	if expires.Valid {
+		t.Errorf("Expected NULL expires after upsert to permanent, got: %v", expires.Time)
+	}
+}